I know this is the "frame building" forum, but is there anyone out there CNC'ing Cranks, Stems, Seatpost Clamps .........etc. I've searched to see if there is a section on mtbr for custom cranks or custom cnc or basically guys or gals doing the CNC thing. Maybe we could start a CNC/Billet thread. Or is this a stupid idea. I'm just looking for some trick CNC goodness. Cheers.

You need a time machine. The American-made CNC parts industry died about 1995.

I do not know of ANY aluminum cranks, seatpost clamps, or chainrings made in the US, let alone made custom. Stems/seatposts you could find some non-custom stuff like Thomson, maybe Raceface.

Look around online for a machinists forum. You'd have better luck there, probably.

-Walt


I know this is the "frame building" forum, but is there anyone out there CNC'ing Cranks, Stems, Seatpost Clamps .........etc. I've searched to see if there is a section on mtbr for custom cranks or custom cnc or basically guys or gals doing the CNC thing. Maybe we could start a CNC/Billet thread. Or is this a stupid idea. I'm just looking for some trick CNC goodness. Cheers.

Are the Zinn cranks made in the US? And don't forget about Boone chainrings. Personally I've had great luck with off the shelf cranks and rings.

Lennard buys his cranks from High Sierra cycles, and they import them from (I think) Taiwan.

-Walt

Are the Zinn cranks made in the US? And don't forget about Boone chainrings. Personally I've had great luck with off the shelf cranks and rings.

I forget, but there are some people machining their own rockers over on the Turner board. Maybe Renegade?

-Derek

Taiwan is now THE source for CNC bike parts. They have been at it for a long time too. I am using Taiwanese made CNC cranks and front rings and the workmanship seems impeccable.

V.

Taiwan is now THE source for CNC bike parts. They have been at it for a long time too. I am using Taiwanese made CNC cranks and front rings and the workmanship seems impeccable.

V.

Don't believe the hype Tiawan prices on CNC work are almost as high as here in the U.s. now , you jsut need to find the right shop. I have found Taiwan doesnt have the same atttention to detail as most U.S. shops do also.

I have designed sevral CNC parts over the part 2 years , some car parts some bike parts I have had them all done here in the U.s.

Here are some pictures of our Stems being made a SuperRat Machine works , this is a small bicycle only machine shop that specializes in high end BMX and MTB parts CNC'd here in the USA !!

http://www.hcor.net/gallery/NemesisProject/stem1.jpg
http://www.hcor.net/gallery/NemesisProject/stem2.jpg
http://www.hcor.net/gallery/NemesisProject/stem6.jpg
http://www.hcor.net/gallery/NemesisProject/stem5.jpg
http://www.hcor.net/gallery/NemesisProject/stem3.jpg

North Shore Billet in Vancouver makes cnc'd parts.

http://www.northshorebillet.com/main.html

More pic's
http://www.hcor.net/gallery/NemesisProject/AUT_4715.sized.jpg
http://www.hcor.net/gallery/NemesisProject/AUT_4720.sized.jpg
http://www.hcor.net/gallery/NemesisProject/AUT_5105.sized.jpg
http://www.hcor.net/gallery/NemesisProject/AUT_5116.sized.jpg
http://www.hcor.net/gallery/NemesisProject/AUT_5124.sized.jpg

We arnt the only ones makig high quaility CNC parts here in the U.S.A , companies such as 26 products (http://www.twenty6products.com/)
Tyler at 26 has done a great job on his Foe (http://www.sicklines.com/news-images/twenty_6_pedalss.jpg)Pedals (http://www.sicklines.com/news-images/twenty_6_pedals2s.jpg)
There are also companies like NYC freeride , Chris KING , INDUSTRY NINE and tons of other companies doing CNC'd parts out of the USA!:thumbsup:

call (805)967-3050...

why would you want a purely machined part when there are so many forged parts floating around.

i take forged over 'cnc' every time. they are just much stronger parts.

You need a time machine. The American-made CNC parts industry died about 1995.

I do not know of ANY aluminum cranks, seatpost clamps, or chainrings made in the US, let alone made custom. Stems/seatposts you could find some non-custom stuff like Thomson, maybe Raceface.

What the hell do you think Thomson uses to make their stems and seatposts? They're all CNC machined from billet. ActionTec is still around also.

What the hell do you think Thomson uses to make their stems and seatposts? They're all CNC machined from billet. ActionTec is still around also.

thats why he mentioned thomson in the reply you quoted :thumbsup:

Thomson is machined from extrusion, not solid.

why would you want a purely machined part when there are so many forged parts floating around.

i take forged over 'cnc' every time. they are just much stronger parts.


I've never liked the look of CNC'd forged pieces .

After getting my soild modeling softwear with F.E.A. I'm pretty happy with the machined parts I can turn out .

It's not that complicated of a design process and when you submit a job with complete
IGIS , STP , DXF and DWG files and a full 3d rendering , you get much better quotes due to the end machine shop not having to convert any files or spend countless hours going over your design for programming.

Our new stems , drop outs and other parts have all gone straight from computer to machine and worked out GREAT!

I really dont want to try to add another step in there of getting a RAW blank forged .
From what I've herd from my friends in the automotive world who deal with parts like these , it isn't as easy as it might seem.

Thomson is machined from extrusion, not solid.

Once again making stuff up as you go along eh?

Thomson had the steps of their assembly on display at Interbike this year, starting with raw solid billet. MBA even ran photos of that in the latest (jan 2008) issue on page 73.

Once again making stuff up as you go along eh?

Thomson had the steps of their assembly on display at Interbike this year, starting with raw solid billet. MBA even ran photos of that in the latest (jan 2008) issue on page 73.

Are you talking about the stems or posts? I'm prefacing this by saying I don't know with certainty but I'd alway thought the posts were machined from extruded AL. The ovalization of the post is NOT an easy thing to accomplish.

Once again making stuff up as you go along eh?

Thomson had the steps of their assembly on display at Interbike this year, starting with raw solid billet. MBA even ran photos of that in the latest (jan 2008) issue on page 73.

i was talking about the seat posts.

anyway, is your argument that cnc from solid is superior to cnc from forging? my point is that cnc from forging is the strongest and lightest way to make most of the bike components. It's also far cheaper than cnc from solid when working on a mass scale. it will be pretty hard to refute that.

cnc from extrusion is pretty great for less critical parts, but it's not usable in most cases.

MBA even ran photos of that in the latest (jan 2008) issue on page 73.

ps. i haven't opened a copy of that magazine in years.

www.paragonmachineworks.com

ps. i haven't opened a copy of that magazine in years.

pvd - d8 seems to always have a bone to pick with folks. he can rattle on all he wants about what he saw in magazines, but for those of us that were actually at interbike, we were able to handle the EXTRUSIONS that Thomson starts with, as well as discuss the extrusion process with Thomson employees.

for those of us that were actually at interbike, we were able to handle the EXTRUSIONS that Thomson starts with, as well as discuss the extrusion process with Thomson employees.

I have a nice talk with Dave every time I go to interbike. He's really on it and great to work with.

100% machined parts, as previously stated, have gone/are going the way of the dinosaurs.

Too expensive with little to no performance benefit.