Custom handbuild Road Stem........ 107gram

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Hyde

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Posted: Fri Jul 21, 2006 9:16 pm

Joined: Mon Jun 26, 2006 4:39 am
Posts: 1688
Location: Los Angeles=Hills, Smog

Send one to me! I'll test it too...the same way :wink:

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collideous

Post subject:

Posted: Fri Jul 21, 2006 9:23 pm

Joined: Tue Nov 29, 2005 5:53 am
Posts: 476

DocRay wrote:

Very nice CNC work.

but have you tested this design for strength? You're not going to mount it on your bike and just go riding are you?

When you build stuff yourself, going out and riding it is your testing! That's how I've always tested my parts. You could do some finite element analysis provided you have the software and you actually know what you're doing.

Tillquist, very fine job! This is one elegant stem. In fact I think it is the nicest stem I've ever seen - beats everything you can buy!

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Nicolai

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Posted: Fri Jul 21, 2006 9:36 pm

Joined: Fri Oct 15, 2004 8:55 am
Posts: 241
Location: Helsinsky Finlandia

Tillquist wrote:

DocRay wrote:

Very nice CNC work.

but have you tested this design for strength? You're not going to mount it on your bike and just go riding are you?

Yes i am... that the only way i can test it.

Look ma, no hands! Look ma, no teeths! :roll:

I looked the images, and came also bit worried, although it looks quite impressive. Did you let it run trough a FEA-program at the first stage?

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Tim

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Posted: Fri Jul 21, 2006 10:47 pm

Joined: Fri Dec 31, 2004 8:43 pm
Posts: 417
Location: sweden

I'm using alu bolts in the faceplate on my syntace stem w/o problems for 4 months and will defenatly don't mount steel bolts again. And that's on my xc bike.

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Gazelleer

Post subject:

Posted: Fri Jul 21, 2006 11:15 pm

Joined: Mon Nov 01, 2004 3:13 pm
Posts: 576
Location: €pe

DocRay wrote:

Very nice CNC work. but have you tested this design for strength? You're not going to mount it on your bike and just go riding are you?

That's the way most manufacturers test their stems, they just put it on your bike and see if it holds up!

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CaptainWilier

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Posted: Fri Jul 21, 2006 11:19 pm

Joined: Thu Feb 24, 2005 5:14 am
Posts: 1913
Location: Georgia

Very nice work! How long did it take?

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Mads Kock

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Posted: Sat Jul 22, 2006 12:56 am

Joined: Thu May 26, 2005 7:52 am
Posts: 2620
Location: Malmö, Sweden

Looks nice and the weight is good!

why did you choose that angle - looks like alot of spacers under your stem?

excellent work, Morten!

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mzagorski

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Posted: Sat Jul 22, 2006 1:46 am

Joined: Fri Jul 16, 2004 12:06 am
Posts: 1246
Location: A Scotsman on rock in the pacific

Looks like some nice work but akin to an anorexic Thomson X2... I would try and test it without riding it though.... make two or three.. hang some weights of it... at least up to your bodyweight.. then factor in some kind of err.. safety factory %.. Being WW is cool but having surfing asphalt on your face at 30+mph wouldn't be worth 50g savings?... or is that not in the WW spirit?

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Tillquist

Post subject:

Posted: Sat Jul 22, 2006 9:23 am

Joined: Fri Dec 30, 2005 3:33 pm
Posts: 1316
Location: Denmark

collideous wrote:

Thanks collideous.
No, i don't have a computer software, so i can test it's before i made the stem...

The Custom made TT-bar i made last winther still hold :wink:

...so i am sure this stem also will hold....

Nicolai wrote:

Look ma, no hands! Look ma, no teeths! :roll:

I looked the images, and came also bit worried, although it looks quite impressive. Did you let it run trough a FEA-program at the first stage?

I have no FEA-program to run it trough

CaptainWilier wrote:

Very nice work! How long did it take?

I am not sure, but aboute 23-28 hours....
3-4 hours to draw it, in AutoCad.
6 hours in a CNC Lath.
10 hous in a CNC Vertical Machining Center.
2-3 hours to made some spec tools, i use to made the stem.

Mads Kock wrote:

Looks nice and the weight is good!

why did you choose that angle - looks like alot of spacers under your stem?

excellent work, Morten!

Thanks Mads.
This stem are made for my road bike, i will made a -5° or -10° for my MTB bike... so this stem are only on the MTB to tray it out.

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Luc

Post subject:

Posted: Sat Jul 22, 2006 9:36 am

Joined: Fri Oct 22, 2004 8:28 pm
Posts: 1176
Location: B e l g i u m

Great job !

Don't black anodize it !!... Too cute like that !

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Skillgannon

Post subject:

Posted: Sat Jul 22, 2006 9:48 am

Joined: Sat Apr 01, 2006 12:17 am
Posts: 3603
Location: A bigger rock in the Pacific (AUS)

I agree with Luc about not anodising it - look sgreat with the bontragerbar the way it is. Quick set of links for finite element analysis programs though - I think all of them are free, havent checked them out, just collected the links then for you

http://felt.sourceforge.net/
http://www.calculix.de/
http://www.code-aster.org/
http://www.dealii.org/
http://www.csc.fi/elmer
http://www.fenics.org/
http://www.freefem.org/
http://impact.sourceforge.net/
http://www.imtek.uni-freiburg.de/simula ... ca/IMSweb/
http://www.autofea.com/Download-FEA-software.htm
http://libmesh.sourceforge.net/
http://www.ofeli.net/
http://www.oofem.org/
http://opensees.berkeley.edu/
http://software.sandia.gov/sundance
http://slffea.sourceforge.net/
http://yade.berlios.de/
http://z88.org/
http://homepage.usask.ca/~ijm451/finite ... urces.html

Hope it helps someone

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Tillquist

Post subject:

Posted: Sat Jul 22, 2006 9:51 am

Joined: Fri Dec 30, 2005 3:33 pm
Posts: 1316
Location: Denmark

Skillgannon wrote:

Thanks Skillgannon...

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Skillgannon

Post subject:

Posted: Sat Jul 22, 2006 9:53 am

Joined: Sat Apr 01, 2006 12:17 am
Posts: 3603
Location: A bigger rock in the Pacific (AUS)

No problem - I've been meaning to try out some FEA for some designs I've had lying arround (actually had to throw out half of them, the office was getting to dusty), and since I cant ride today its the least I could do.

I'm just downloading the Z88 one now to try it out.

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Tillquist

Post subject:

Posted: Thu Sep 07, 2006 8:37 pm

Joined: Fri Dec 30, 2005 3:33 pm
Posts: 1316
Location: Denmark

After long time, the stem is finish

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Skunk

Post subject:

Posted: Thu Sep 07, 2006 8:49 pm

Joined: Wed Mar 08, 2006 7:23 am
Posts: 1225
Location: bay area

Tillquist wrote:

After long time, the stem is finish

Wow, looks awesome! I think you should sell them now.

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