Thứ Năm, 31 tháng 5, 2012

The pleasures of a Level 4 class

It's not often that we get to coach higher-level classes. In the great pyramid of kayak lessons, beginners form the base. Comparatively few people seek out instruction after they're solid intermediates.*

So it was a pleasure for Sharon to spend Memorial Day weekend teaching a Level 4 Open Water Kayak Training for Geneva Kayak Center with Scott Fairty, one of our coaching mentors. Designed to help participants work on the skills they'll need for an American Canoe Association Level 4 coastal skills assessment or a British Canoe Union four-star sea leader assessment, this course simulates tidal features by using the Menominee River in Wisconsin and then chases exciting conditions on Lake Michigan and Lake Superior for wind, waves and surf.

The large-volume Menominee River provides current and class I and II rapids--perfect for  working on eddy turns, peel-outs, attainments and ferry glides.
The Menominee is one venue that allows midwestern paddlers to develop skills needed for paddling in ocean currents. In addition to moving water, it offers eddies, overfalls and other ocean-like features. It demands precise maneuvers of paddlers who wish to avoid getting washed downstream and hung up on rocks. We spent the first day on the skills necessary to successfully enter and leave eddies, ferry across the river and attain upstream.

Storm coming in. Load the boats and head for the water!
Then, as predicted, the sky clouded over, the wind picked up, and the temperature dropped. The weather was custom-made for a Level 4 course in the Apostle Islands, so we loaded up and drove to Lake Superior, where the forecast for the next day was winds of 15 to 25 knots out of the northeast and waves of 5 to 7 feet.

Near shore, the waves were far smaller, allowing for some practice launching and maneuvering in conditions. We paddled out to Sand Island, beloved for its sea caves, where we had lunch in the refuge behind a park service building.

Lunch the the lee of a park service building.
Then we set out in search of larger waves, which we found slightly further along the shore. We paddled out into 5- to 7-foot waves with the wind howling in our ears, then turned around and paddled back with the wind and waves behind us. These are serious white-knuckle paddling conditions for intermediate paddlers; these participants impressed us with their mental and physical fortitude. They're also challenging conditions for navigation and course plotting because the wind figures into the calculation. We practiced various ways of accounting for the push of the wind, and ended the day exploring the power of the waves along the shoreline.

We debriefed over pizza ("Serves five? We'll take two of those!"), discussing paddling strategy in wind and waves, risk management, rescue strategies and other facets of the day's experience. Overnight, the winds calmed and shifted to the southwest. The next day was perfect for rock gardening, paddling through arches and poking into sea caves.

Bill paddles out between two rocks, just ahead of a surge.
Rock gardening is all about timing and stroke placement. Do it right, and it looks easy. Do it wrong and you're stuck on a rock. It's fun in its own right and great practice for paddling on the ocean.

Paddling along the sea caves.
The waves were all but gone by the afternoon, allowing us to practice extracting boats from sea caves along with other rescues. The cold water -- barely 40 degrees -- provided an incentive for quickly getting people back into their boats.


Scott showers off below a waterfall.

During the final debrief, we talked about what we had worked on and what people had learned. Everyone said they had learned new skills, some of which they had not realized they lacked and needed. Everyone knew they needed to work on the speed and efficiency of their towing and rescue skills. And everyone had fun, which, at the end of the day, is why we paddle in the first place.

*"Intermediate," of course, means different things to different people. Some cease to call themselves beginners after their first class. We would define an intermediate as someone with fairly solid boat control and a reliable roll in winds to 10 knots, rescue and self-rescue skills, knowledge of safety and environmental considerations, and the ability to be a competent member of a paddling group. The BCU three-star award defines intermediate paddler very comprehensively. But that's a post for another time. 

Thứ Hai, 28 tháng 5, 2012

TTen years after... an excerpt from Riding Man

It's hard for me to accept that this week marks the Tenth Anniversary of my TT. I'm still very much aware of it; people buy Riding Man every day -- and in fact there's an interesting meeting in Hollywood later this week, as the book continues its (excruciating!) 'development' as a feature film. But, ten years...
Photo by Peter Riddihough, courtesy www.onemansisland.com
Like a lot of people, I begin each new TT fortnight hoping mainly that -- after this one -- there'll be at least one more. It's an event from a different time, when life and limb were, somehow, not so precious. As such, it lives on borrowed time.


None of that changes the fact that, if you love motorcycles and motorcycle racing, the Isle of Man is your spiritual home. If you've never been, you owe it to yourself to go. And like me, you'd better hope that this won't be the last TTime...


The TT lived in my imagination for about 40 years before I got there. In 2002, when I finally arrived in the paddock before dawn on the first day of practice, I walked into a setting that I'd imagined so many times, I experienced a profound sense of déjà vu. 



I wrote about experiencing the paddock for the first time, after imagining it so many times, in Riding Man. If you'd like to read about it, click that tantalizing 'Read More' link on the next line...




The Striped Tent



We’re up and bumping into each other on the way to the bathroom, scrounging in the kitchen, at about 3:45 am. It’s a little bit of a late start. Not very late, but enough to put us on edge. Toast, coffee; listening to Manx radio–expecting to hear that the weather has caused them to cancel or delay practice, because it’s blowing a gale out there–but there’s nothing but oldies. We load Peter's little rental Nissan with camera gear, a stand for the bike, and a jerry can with spare fuel. Although I have a reasonable toolbox on hand, Paul has picked out the hand tools he wants and put them in a white plastic shopping bag. Various sharp points are already poking out a bit. I’m in my leathers, with a rain suit over top. I’ve packed one little bag with spare helmet visors, glasses and cleaner, dry gloves, and the orange “Newcomer” vest I was issued yesterday. 


Last night, Steve told me he would drive across from Glen Maye and be there to wave me off at first practice, but there’s no sign of him. Just as we’re ready to go, maybe 4:15 am, Andrew rides up on the knackered Yamaha DT125 he rides to work. He lives way down at the south end of the Island, in Port Erin. “Jesus!” I say, “What time did you get up?” He tells me that he didn’t really sleep, so waking up wasn’t a problem. 
Paul rolls the CBR down the driveway and starts it up. He holds it while I get on. We quickly check to ensure we’ve all got our passes, then Paul hops into the passenger side of the Nissan. I lead the way to the paddock, with Andrew as wingman on the DT, and the car behind. 
A lackadaisical security guard waves us into the upper paddock. I turn right and ride up to join a few bikes waiting their turn at scrutineering. Andrew follows me in and parks his trail bike off to one side. Peter and Paul turn left, winding between campers and the shower building, and make their way to the lower paddock, to park at the spot where we’d erected our awning on Thursday. As the line moves forward, a volunteer comes out and notes the number on my bike. (I run the number 57 on a blue background. That’s my official number for the Junior race, and I’ll use it throughout practice.) He returns with a sheet of paper for me to fill out. I try to shield it from the rain. 
By the time we get to the head of the line and have been ushered into the shelter of the garage, Paul has arrived with the bag of tools. He takes over the bike and watches warily as a scrutineer examines it. A Japanese TV crew watches us watch the scrutineer. An old guy, he has us gently push the bike forward while he tries the front, then rear brakes. He pushes the handlebars from one stop to another, checking to make sure there’s finger clearance at the gas tank. Holds the front brake tight, and pulls down hard on the handlebars, feeling for looseness in the bars or steering head, and looking for oil at the fork seals. 
Finally, after working his way from front to back, he signs our form, and points the way out the other side of the garage into the “parc fermé” (the term is just French for “closed parking,” and it’s a fenced-off area in which, in theory, the bikes are off-limits until we’re told we can go out on course.) He tells us, “Yours is the first bike I’ve passed in an hour,” and it turns out it’s the shark fin guards that are the sticking point. They’re not bending the rule, so in hindsight, all the running around and hassle involved in making it now seems worthwhile. 
In America, and at short circuit races everywhere, the tech inspector puts a sticker on your bike, and you can return it to your pit. Once you’ve “teched,” you’re good for the entire weekend. You don’t have to go back for another inspection unless you crash. Here, once your bike’s been checked, it goes into parc fermé. It has to be ready to ride, as it’s against the rules to work on it. The process is repeated every time you take to the circuit. As we push the CBR through the gate, the attendants there tell us, “No chance of going before 6 a.m.” So we have nothing to do but wait. 
There’s a huge blue and white striped tent nearby and without asking I know it’s “the” blue and white tent I’ve been reading about since I was in high school, poring over accounts of the TT that used to appear in summer issues of Cycle. It’s the tent where riders go to await the start, have a tea in the morning, or a mug of soup when they stumble in half-frozen from a wet practice. 
It’s as familiar as can be. Two women of the grandmotherly type ubiquitous among TT volunteers tend a pair of enormous kettles. A plywood table sits in front of them covered with styrofoam cups. Milk and sugar are laid out. An oversized tin can’s been turned into a sort of piggy bank; donations are welcome but they understand when you come creaking in a race suit that you probably don’t have pockets, say nothing of coins for the tin. 
I ask Andrew if he wants a cup of tea. He looks down. “No thanks.” He works full time at Padgett’s, but he’s only 16 or 17. This is the first time he’s ever had a team pass. Despite (or is it because of?) being Manx, he’s awed. He doesn’t seem sure if the tea’s for the likes of him. 
Every now and then, the wind sets the canvas to flapping. Steam from the kettles mingles with breath and smoke, and rises to condense against the ceiling. It falls as though it’s raining in here, too. 
The Dunlop 208s we have on the bike have practically no tread. They’re obviously intended for use in the dry, but Paul warns me that it’s not just a matter of tread pattern; the rubber compound itself has less grip in the wet. “Even World Supersport and AMA guys slow right down on them if it starts raining during a race,” he says, by way of telling me I shouldn’t push my luck, if we get to go out at all. 
After we’ve been in the tent for a while, Peter wanders in looking for us. He tells me that our parking spot down in the paddock has now got someone else’s trailer in it, and that access to our awning has been almost completely cut off by people who arrived and set up after us. This is the kind of thing that really bugs him. Me too, but I don’t want to think about it at all until after practice. 
Paul, it turns out, has something he either wants to drop off in the car, or pick up from it, and takes the keys. As he’s leaving, he says something like, “Well, anyway, we’ll just have to fucking move them out.” He’s a fair size, and not interested in creating a good first impression with strangers. I wonder if he’s about to pick a fight down there. While he’s gone, my imagination works overtime, concocting ever more irreconcilable confrontations. My mood is not improved now that Peter’s sitting with us, because he says the guys crowding our spot look like real thugs. I shouldn’t be thinking about this stuff, and I’m glad when Paul comes back. We agree we’ll go and sort it out before this afternoon’s practice. 
Around 6:30 a.m. there’s a crackle from the P.A. system, a musical ping and an announcement: we’ll be allowed to go out for a single lap. At great length, the announcer warns of standing water all around the course, leaves and debris on the road under the trees, fog, and severe wind on the Mountain. “Do not,” he concludes, “attempt to lap at anything like normal practice speed.” 
There are just a handful of us, pulling tarps off bikes in the parc fermé. Most of the riders are already back in their trailers or hotels, back in bed, pretending they didn’t get up at 4 a.m. 
Still, I’m glad to have a chance to review the launch procedure. Bikes are fired up in the parc fermé and then the stewards open a big gate onto Glencrutchery Road. There’s no prescribed starting order to practice. Bikes pull out and line up two by two. Most riders are accompanied by two or three mechanics and friends, who help push them slowly along. 
You pass a person standing in the road, supporting a plywood sign with a drawing of a crash helmet and the question, “Helmet Strap?” Then another person, with a chalkboard, which carries specific notices of the hazards of the day. This morning, it is a Manx haiku: 
     Heavy Rain 
     Standing Water–all around course 
     Fallen leaves on road 
     Fog on mountain 
     High Winds 
     Be Careful 
As you push toward the start line, the mechanics and friends fall back. A few feet from the starter, the last-but-one official makes eye contact with you, and signals you to shift into neutral; they don’t want some short circuit racer instinctively launching the second he sees the rider in front of him going. 
Finally, it’s just you and your practice mate on the line, with the starter standing between you. The starter puts a hand on each rider’s shoulder, usually leaning in to say something like, “Take your time, it takes years to get around here really quickly,” then taps you when it’s your turn to go. 

To read more, go here.

Chủ Nhật, 27 tháng 5, 2012

哭哭QAQ

可惡的臭狗.......

竟敢咬我

XD

我還不是怕他跑出去回不來才去抓他說

結果就一直GG叫~~~~~~~真的是臭狗

叫超難聽的XD

然後我手也掛彩了

shit


傷口有一個比較深

有一個是........腫起來0rz

超靠杯的.......馬的

我就用line密狗主人說

我被你的狗咬傷了....

他回說

拍傷口給我看

XD

竟然不是問我怎樣而是直接要我拍傷口

如果他狗不是小隻的那種

我恐怕沒有大拇指可以拍照給他看囉~~~

雖然我能line的前提就是還有手指啦XDXD

但這裡只是插曲還不是重點


重點是整個過程沒有半句抱歉或拍謝

我覺得真的超誇張

對我而言已經超出我的點了

沒辦法我是宅宅~~~跟一般人的思維有差

但宅宅就是覺得這種鳥事~~~~沒道歉就是太誇張了


我有跟他說~~~~腫的跟甚麼一樣~~~

他說他的狗真欠揍~~~就醬子~~done~~~conversation over

XDXDXDXDX

她男友來了~~~~~就賞我OK蹦

然後叫我手給他看多腫

said:腫得不大呀~~~~~~明明都1.5倍大了......

真的是王八羔子


而且被狗咬要打破傷風說

阿淦就叫我暗示他說我一定要去看醫生打針~~~(很嚴重的說)

對方回說他以前就被咬過~~~~~~還活好好的

不過也確實是啦XDXD

但我這樣暗示她我也沒意思要他幫我出掛號費

從頭到尾我都在等他那兩個字

但顯然是我活該


每次我爸跟我說~~~~~你的貓又把我抓傷了

我都會說你自己要去玩弄他的~~~~~

我當然不會道歉XD

這種心情我了解

你就是活該我幹嘛道歉

我覺得除了這樣解釋對方的心情我想不到別的了


而且隔天還做了水果拼盤給我做補償

兩顆李子+剝皮香蕉組成懶覺的樣子給我吃

我真的不知要說啥

我無言了

一般人可能覺得很好笑吧

lol


假如今天你是我

被人家的狗咬傷~~~~~~結果收到懶覺樣子的水果拼盤作補償

你會覺得好吃還是想扁人XD


今天如果張睪對我做這種事

我一定翻臉

還會當場罵幹拎娘機掰

不過當下我不想理他們~~~~~~~我還能說啥

我只能繼續一直打我的暗黑3~~~~~~都快50等了XD


我跟她說我手受傷的過程

還有附帶說你的狗在我們房間拉尿

沒有半點feedback完全

所以拉尿活該的是我們門沒關讓你的狗進來拉尿

一般人覺得理所當然吧所以forget it

但我覺得






真他媽臭狗

幹XD


阿淦就叫我跟他開玩笑說

我把你的狗變成"多"了

(那隻狗叫多多)

他就問為什麼!?

因為我把它折斷了

XDDXDXDXXDDXDXDXXDXD

我覺得超好笑XDDXXDDXDXDXDX

可是潮妹說很難笑............我的點真的有這麼低嗎XD


反正今天這件事

個人的觀感是少了抱歉兩個字就是太靠杯了

也許其他人不這樣想~~~~

但也許對方覺得我活該我應該

都好~~~~~~~隨便~~~~~我都覺得要道歉

只要兩個字就好~~~~~~

我也不會要OK蹦貼腫起來的手

也不會要掛號費

也不用懶覺水果拼盤

我也不會心寒

當然也不會po文

XD


從以前到現在我覺得我一直擔任"施"的角色

我對周遭的朋友其實沒有甚麼要求說

大學我就很常當好人帶飯~~~~~超級無敵大好人XD

即使後來大4宅在房間打牌決定誰帶飯

我也常去帶飯~~~~~~~因為我被它們作弊

幹XD

但今天發生這種鳥事

我真的很希望對方可以道歉說

連這點都沒有

真的還蠻心寒的


我也懶得跟對方說

幹你幹嘛不道歉

講了也只是產生多餘的口水也得不到誠意

Thứ Bảy, 26 tháng 5, 2012

STEP 2

STEP 2

For this STEP 2, I will show you ONE way to start this kind of part. Of course there are a plenty of way (probably one by each modeller!).
I used for this exemple some Nurbs Curve (compare to the Bézier one).
The most of the Class A modellers would like to use the Bézier workflow and/or mono span...
Here I cannot explain all details regarding Bézier vs Nurbs, but you need to keep in mind one thing: CONTROL all the time each parameter curves and or surfaces built by your software, this is can called the "explicit modelling".
Never belive what your software done! In general do not belive everyone (same for me)...

I will show you how to rebuild some curves according to the scan clean in the the STEP1.

(for information: As I said before, this is a hand made model, also when I will rebuild the main curves I cannot follow exactly the shape build by hand... If you need to reproduce the exact shape you need more time but the workflow does not change too much).

The most difficult for me is to build a curve with the minimum control point according to the shape we would like to copy...

Same there are a plenty of curves, spline, arcs etc... show the one you like and the one you can control as you want:

Here I copy the shape with one curve and after I copy > move > scale > modify the control points for doing the second curve under. Now I have two nurbs curves with the same parameter, degre 4 / 3 span (nurbs)



Here I use some surfaces to cut the scan and find other sections... After that I need to rebuild the sections by new curve (controled)... Many soft have some more or less automatic way to define all of this cruves. Did as you want BUT CONTROL your work all the time. (sorry I said again and again "Controle" but for me Class A is only control data workflow...).

Here you can see some "green" surfaces who can help you to define some G1 according to the symetric part and also some direction if you need it like X for the biggest section (right on the picture).

Becarful, I build only one nurbs surface with 4 sections and two paths... Many modeller tell you this surface is not Class A (probably) but you need to work according to your customer and area standard.
Usually, sometimes I start with a nurbs workflow to define the most of the shape and step by step I come back to the besier workflow if I need to add more details and or more quality...

See you for the STEP 3 ;-)


Thứ Năm, 24 tháng 5, 2012

i-model plugin for Revit

So Bentley provide a i-model plugin for Revit. Details can be found here.

http://www.bentley.com/en-US/Promo/Revit/i-model.htm

image

So on the face of it, this sounds cool if you are say an Structural Engineer or MEP Engineer using Revit & collaboration with an Architect using Bentley tools, but it ain’t much good if its the other way around from my experience.

imageWe have a very complex project where we would have ideally liked to have linked in the Structural Engineers Bentley Structural Model & the facade Architects Microstation model into separate Revit models which we could then link into our main model. IFC I hear you shout! Well good luck with that, as its been a nightmare to get that to work. I will apportion some of the blame to both Autodesk & Bentley for not getting their act together to address the IFC disorder. Although, I have to say Revit 2013 IFC is way better than previous releases, but as this project must remain in Revit 2012 & most of the modelling is now complete, I’m not going to worry about it now. All I can say, is thank goodness for Navisworks! :-)

So the point of the post? People ask my; sorry! people tell me, that I have sold my soul to Autodesk Revit machine. That really isn’t the case, trust me. But right now due to limitations in interoperability I find it preferably to work on the same technology platform. Lets hope the holy grail of IFC does one day allow us to deliver robust data between technology platforms.

Leapmotion

You should check this out…this looks like an excellent piece of technology! I can imagine driving Revit or Navisworks using the this, just a thought. :-)

http://leapmotion.com/

IMAGINiT release new version of IMAGINiT Clarity

IMAGINiT Technologies division has released IMAGINiT Clarity and IMAGINiT Clarity LT for Autodesk Revit Server 2013 software. Designed to enhance the Revit Server platform, this web-based solution offers new and enriched features – all while supporting side-by-side installations of Autodesk Revit 2013 and 2012. Internal team members and external partners can dramatically improve project collaboration, automate repetitive tasks, and provide valuable data to non-Revit users with simple setup, easy administration and secure connectivity.

Architecture, engineering, and construction firms with multiple offices and multiple partners are now able to securely share a centrally hosted Revit 2012 or 2013 BIM model securely. New features enhance collaboration and significantly cut both time and resources required to complete essential tasks.

 

Secure Building Information Models

The new version of IMAGINiT Clarity helps minimize risk of downtime by supporting the ability to host different BIM projects on multiple central host servers. This optional mesh configuration eliminates the single point of failure issue by distributing different projects across multiple servers and also provides load balancing ability for users, projects, regional pipelines and servers.

IMAGINiT Clarity’s central dashboard makes management easy with the ability to view, manage and monitor all of the central host servers as well as local accelerator servers without having to log into each of them separately.

 

Distributed Task Servers

To ensure the host servers are focused on critical functions, the automation of tasks can now be assigned and scheduled to other servers and/or workstations. The new version of Clarity allows specific hardware to conduct mundane tasks while freeing up the mission critical servers and staff to undertake higher value tasks.

To share model data with people who don’t use Revit, IMAGINiT Clarity also provides more export options when transforming model data into file formats. In addition to PDF, DWF, Data Export and Image Export file formats, IMAGINiT Clarity can now also automatically generate both DWG and IFC files.

 

Easy Administration

IMAGINiT Clarity’s dashboard graphically displays the real-time network health of all central and local servers and activity for all BIM projects. The dashboard also provides alerts as they arise such as Model Locks, bandwith or connectivity errors, assisting the administrator to both pinpoint concerns and quickly correct the issue. Additional enhancements with this release include extending the integration and synchronization of Active Directory to virtually eliminate additional IT management required for setting up or managing user and permissions within IMAGINiT Clarity.

New LT Edition

Organizations of many sizes can benefit from Clarity, but not all need the entire package. Seeing this need, IMAGINiT created Clarity LT which helps organizations looking to get started with project sharing and security. Limited to 2 active projects and 25 users, Clarity LT has the same overall capabilities of IMAGINiT Clarity

Thứ Tư, 23 tháng 5, 2012

Revisiting the @tsunamiharley story

A little while back, when that Harley-Davidson washed up on a remote island in British Columbia -- the first major piece of tsunami debris to arrive in North America -- Harley-Davidson was pretty quick to offer to restore the bike and return it to its owner. It was a mainstream media story for a few days, especially in Canada, but it wasn't long before it fell off the radar screen.



This video clip tells the story, as of about three weeks ago. It turns out, it had one poignant closing note.

Ikuo Yokoyama lost his father and brother in the tsunami. It swept away his home and everything in it (and the container, in the back yard, where he parked his Harley.) He's still living in temporary shelter.

At first, he was thrilled they'd found his bike, but when he was told that Harley-Davidson was going to refurbish it and return it to him, Ikuo told Harley he could not accept it. He said, it would not be fair to spend so much on him and his motorcycle, when so many tsunami victims still have nothing.

I've written in the past about the way, in the weeks after the tsunami, millions of dollars worth of Japanese cash was found in the wreckage, and turned over to authorities. I won't bother asking the people rebuilding Joplin how much cash was turned in there, after the tornado that wrecked the town at about the same time the tsunami was doing its thing. Zero fucking dollars, you can be sure.

Only about 1/4 of the people living in the tsunami area were insured against such a flood. Most people who were insured were covered for their homes only, not contents. I hear that Harley-Davidson's offered to give the money they would have spent restoring Ikuo's hog into a tsunami relief fund in his name. That's small beer, but I guess it's all that's expected of them.

I don't have a conclusion for this post, sorry. I am not sure what should be done with Ikuo's motorcycle. I with they'd just left it on that remote beach with a plaque telling the handful of visitors that would see it every year that the rightful owner could have had it back, but refused it, because he couldn't bear the thought that he'd been treated better than anyone else.

We could use a few more people like that guy.

Thứ Hai, 21 tháng 5, 2012

Rescue Me! Thursdays offer free training

Tom Lindblade (far left) and Scott Fairty (second from left) with some of the participants in a recent Rescue Me! Thursday.
This is year two of Rescue Me! Thursdays, an initiative of the Illinois Paddling Council. These weekly training sessions were initially created in order to train the Paddlers Patrol, another IPC initiative--a volunteer group that provides safety boaters for local events, such as the Flatwater Classic, the Illinois Paddlesports Festival and the New Year's Day Paddle.

The concept is simple and smart: Take advantage of the Marge Cline Whitewater Park in Yorkville, IL and the expertise of Ryan Rushton and Scott Fairty of Geneva Kayak Center (located on the course) to offer weekly training sessions on basic swiftwater rescue. The brains behind this belong to Tom Lindblade, president of the IPC, who has been an experiential educator and canoe instructor for more than four decades and was recognized three years ago with an "Excellence in Instruction" award by the American Canoe Association.

Tom Lindblade, mentor to two generations of paddlesport instructors and president of the Illinois Paddling Council.
We had the good fortune to be present for this past week's session on wading rescues. This was the fourth in this year's series, following cold-water rescues, rescue ropes, and boat-over-boat rescues. Lindblade teaches most of the classes, with help from Scott Fairty. Towing, bumping and unpinning boats will follow in the coming weeks.

The group wades into the river, using paddles for support.
"Imagine if someone who was rescue-trained had been there when those three men died in the dam," Lindblade says, referring to the tragic incident in 2006 that led, years later, to the demolition of the deadly Glen D. Palmer Dam and the creation of the whitewater course in Yorkville. "That kind of thing can happen any time, and now we've got whitewater in the area, so these skills become more necessary."

Scott Fairty (green helmet) takes six participants safely out into the current.
Attendance has been good: between 9 and 17 people per week. The training is free (though non-ACA members must pay $5 for insurance when they sign the liability waiver) and no reservations are required. Just show up at the whitewater park at 6 p.m. on Thursdays in May, and you're part of the class.

Alec simulates a pin on a rock.
"This is one of the most important things we can do," Lindblade says.

Mating Linear and Spherical Components

I was recently contacted by a customer who designs and manufactures a range of optical and crystal monitoring and control systems. Included in their design work is the requirement to position lens components with a high level of precision. This often includes using a spacer component to ensure that an energy source is a specified distance from the lens surface.

The customer wanted advice on how to accurately mate the spacer to the domed surface of the lens as automatic mates would not give him the result that he wanted. The following post has been written to assist users with similar issues.

The projection of a linear dimension onto a spherical surface produces an irrational number and you will therefore be unable to mate the surfaces directly together. However there is a way of working around this by creating sketches within the individual parts and mating these together instead as explained below.

For this example, a spherically domed lens is required to mate with a cylindrical tube spacer to be used within the prism assembly shown above. The transparency has been changed in the parts to make the images clearer.
If attempts are made to mate surfaces or edges together on the parts, the following results may be given.

If you attempt to mate the domed face and the related face on the spacer, the option of a Tangent mate is the only one available. This will position the face of the spacer on the tangent of the extent of the dome.



By selecting the domed face and the internal circular edge of the spacer, the required calculations to produce a coincident mate create irrational numbers and the geometry cannot be mated.


By selecting the circular face of the spacer part and the circular edge of the domed face of the lens part, the mate produced will pull the spacer part through the domed surface.

 

Solution for the problem


Open the Lens part and start a new sketch on a plane that dissects the domed face of the lens.

Select the silhouetted edge of the dome and use the convert entities function. This will create a 2D sketch profile of the dome. Ensure the sketch is left visible and save the part.


Open the Spacer component.  This example was constructed using a Boss-extrude followed by a cut extrude.
Open the sketch that defines the profile of the hole through the spacer. Use the sketch point tool and add a point that is coincident with the profile of the sketch that defines the hole.
Show the sketch that defines the profile of the hole so that it will be visible when you view the part in an assembly.








Now that the sketches in the part files have been created, they can be used to mate the parts together.


In an assembly that contains the lens and spacer parts, you can now mate the point that you created on the sketch for the profile of the hole in the spacer, with the silhouette sketch on the lens part.

 
This will ensure that the point will be coincident to the silhouette sketch

 

Make the temporary axes visible to be able to mate to the central axis of the lens. In this case the spacer’s axis will be mated to the axis of the lens.
The sketch point on the profile of the hole sketch is coincident with the silhouette edge of the domed surface of the lens, and will keep this relation when the parts axes are mated.
 
By mating the sketch geometry created together, the required result of the spacer connecting with the lens at their extents can be achieved


Chủ Nhật, 20 tháng 5, 2012

Monday Morning Crew Chief: How does Rossi feel about lapped traffic now?

Over the winter break, most factory riders in MotoGP were openly critical of the prospect of encountering lapped traffic (again) in the premier class in 2012. The tone of discussion ranged from assuming that fans would be aghast at the sight of backmarkers (no relation) being lapped, to implications that speed differentials would create major safety hazards.

Valentino Rossi and Nicky Hayden were almost the only two factory riders who didn't decry the CRT rules. The two Ducati riders were far from enthusiastic  about the prospect of sharing the track with riders and motorcycles turning significantly slower lap times, but at least they were open to trying the new rules on for size.

I guess Rossi may now be one of the few factory riders actively supporting the CRT rules, after one of the CRT bikes, getting lapped at the end of the race, slowed Casey Stoner just enough to allow Rossi to close the gap to second place. Rossi would never have caught and passed Stoner otherwise.

I doubt Stoner was philosophical about the presence of the lapper -- and I suppose I have to admit that I jumped the gun a little in assuming the FIM would force him to race by himself as early as yesterday. Now that he's shown a bit of vulnerability, I guess they may put the SuperLeague on hold.

But seriously, folks...

Where did the idea even come from, that no one should ever encounter lapped traffic in the premier class? Dealing with lapped traffic has long been a part of racecraft; there were lappers in almost every 500GP race ever held. Hailwood and Agostini used to just about lap everyone but each other.

The AMA's tightened Q standards in recent years with an eye to reducing lapped traffic here in the U.S., and the races have been great -- but the credit for that goes towards ever-more-restricted technical rules and spec tires -- not cleaning up the back of the grid*. Miguel Duhamel, for one, would have a much smaller win total if it hadn't been for his skillful use of backmarkers -- I often saw him deftly catch and pass riders on better machinery, when they caught up to rolling chicanes in the second half of AMA nationals.

I think most people would say that the rapid evolution of the four-stroke bikes in the MotoGP era, particularly in the area of electronics, has reduced the amount of passing and dicing at a time when the problem of processional races is compounded by shrinking grids. Predictability is a great thing if you're the best rider on the best bike, but it sucks for the fans and the mid-grid. Lapped traffic is, if nothing else, a randomizing factor that re-emphasizes the rider's racecraft, and de-emphasizes the black boxes.

Lappers aren't necessarily bad for the show. Just ask Rossi.

*And, to the absence of Spies and Mladin. I'm just sayin'...


Why unified Autodesk login is a mess

Ok, I don’t generally rant…(my wife thinks differently)…..but the unified Autodesk login is a total mess. Now it maybe that is has a lot to do with legacy login details when I was at Excitech (reseller). When I moved to HOK, I had to jump through all sorts of hoops to get it fixed. Finally it got is resolved. Then this year when I logged into the Subs centre I only saw a fraction of what I was supposed to see. Today, I can’t login at all!!!! Try to reset the pass word but “Computer says No!”….so what does this mean….well I can’t login to the Subs centre, I am locked out of the Cloud & I can’t access anything on the Autodesk Labs website. A wasted afternoon.

imageI guess those guys at the support centre will react & get it sorted, but this is not much good if you are trying to work at the weekend. Maybe the lesson is not to work at the weekend as the Autodesk Cloud is not open for business!

Thứ Năm, 17 tháng 5, 2012

Injury-prone Hopkins proves natural fit for high-profile out-of-industry sponsor

The news that Superbike and sometime-MotoGP star John Hopkins will race at the upcoming Miller Motorsport Park SBK round on painkillers, and an ominous 'tweet' from @JHopper21 that suggests his hip injury may be a lot worse than we'd hoped all ads up to more of the same news from the Hopper. The guy spends more time in the hospital than he does at home.

That's bad news for most sponsors, who pay to have Hopkins on the track, and hopefully, flashing his pearly whites at their PR events.

But it appeals to his latest sponsor, for which both his name and his injury-prone habits fit perfectly...

Yes, he's just signed a sponsorship deal with Johns-Hopkins Medicine, the best and most famous hospital in the U.S.

"I get all kinds of sponsorship offers, from people who don't want to spend money but want me to use their stuff," Hopkins told Backmarker in an exclusive interview. "But really, how many helmets can I use? And, like, do you have any idea what a gallon of Monster a day will do to your kidneys? But hospital care's a different story; for me, that's as good as cash. I'm pumped to begin using Johns-Hopkins as soon as possible. I don't even have to crash again, since I've got so much old damage they can go right to work on."

Eugenia Marx, the spokesperson for the famed Baltimore institution, said, "It's a slam dunk -- oops, sorry for that stick-and-ball metaphor -- but I mean, what could be more natural that Johns-Hopkins sponsoring John Hopkins? Everyone here is eager to get to work, trying out new medical procedures on 'Hopper's' creative new injuries. I mean, how often do you get to see bone chips in a hip joint? We didn't even know that injury was possible until John came along."

Hopkins' agent, Bob Moore, said "We're pumped by this new sponsorship. As you know, the whole motorcycle racing industry loves to see non-endemic sponsors come into the sport, and we're proud to have brought in one of the most respected brand names in the U.S."

"Now that I know I'm backed by America's top hospital," Hopper told Backmarker, "I'm going to ride even more recklessly than before!"
"Holy Crap! This guy's got injuries on his injuries!" Careful Doc, that's your new poster boy...