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PostPosted: Fri Jul 21, 2006 9:16 pm 
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Location: Los Angeles=Hills, Smog
Send one to me! I'll test it too...the same way :wink: :D


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PostPosted: Fri Jul 21, 2006 9:23 pm 
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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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Posted: Fri Jul 21, 2006 9:23 pm 


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PostPosted: Fri Jul 21, 2006 9:36 pm 
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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: :lol:

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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PostPosted: Fri Jul 21, 2006 10:47 pm 
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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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PostPosted: Fri Jul 21, 2006 11:15 pm 
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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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PostPosted: Fri Jul 21, 2006 11:19 pm 
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Location: Georgia
Very nice work! How long did it take?


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PostPosted: Sat Jul 22, 2006 12:56 am 
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Joined: Thu May 26, 2005 7:52 am
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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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PostPosted: Sat Jul 22, 2006 1:46 am 
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Joined: Fri Jul 16, 2004 12:06 am
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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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PostPosted: Sat Jul 22, 2006 9:23 am 
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collideous wrote:

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!


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: :lol:

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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PostPosted: Sat Jul 22, 2006 9:36 am 
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Location: B e l g i u m
Great job !

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

8)

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PostPosted: Sat Jul 22, 2006 9:48 am 
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Joined: Sat Apr 01, 2006 12:17 am
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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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PostPosted: Sat Jul 22, 2006 9:51 am 
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Skillgannon wrote:


Thanks Skillgannon... :D

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PostPosted: Sat Jul 22, 2006 9:53 am 
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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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PostPosted: Thu Sep 07, 2006 8:37 pm 
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After long time, the stem is finish :D

Image

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Posted: Thu Sep 07, 2006 8:37 pm 


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PostPosted: Thu Sep 07, 2006 8:49 pm 
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Location: bay area
Tillquist wrote:
After long time, the stem is finish :D


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


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