Originally Posted by isotopesope (Post 6154122)

p.s. i don't think a water jet cut will be precise enough.

Originally Posted by quid (Post 6154109)

are you thatcher the widebody golf thatcher?

Originally Posted by j0e_bik3 (Post 6154236)

your joking right?

some of the MOST intricate 2D machining I have EVER seen was cut on a water jet.

I like the paul track ends with the trick adjuster thingies, but dood, if yer makin a bunch don't forget to post HOW WE LOW LIFES CAN GET A PAIR :D

mm,kay?

Originally Posted by Grimlock (Post 6154242)

Paul's

Originally Posted by wild style (Post 6154291)

That thatcher would probably make them out of carbon fiber, lol. :p

Originally Posted by isotopesope (Post 6154314)

hmmm... i'm a machinist. in my shop, our tolerances typically need to be +0.00" -.005", which is tight for a forge die, but i am setting my tools down to the 0.0001", for utmost precision. i program my toolpaths to have a .0001" to .0005" scallop height for the cavities. everything we've outsourced to a waterjet place certainly gets the job done for what we need it for, but thick cuts look wavy at the bottom of the cut due to the kerf. to cut anything thick and precise requires a 5 axis head to control the kerf... but still it is no match for a mill.

thanks for playing.

Originally Posted by chase. (Post 6154392)

so true. and he'd try to cover a recaro lumbar pad in alcantara and use it as a saddle.

Originally Posted by Soil_Sampler

Surly/Sub11

Originally Posted by j0e_bik3 (Post 6154406)

of COURSE I make a comment based on what I've seen and I get a certified machinist, ok you win. (and why aren't YOU making track ends? :D )

so your saying the bottom edge of a waterjet cut is kerf'd? (yes I know what a kerf is) and wavy? I never saw that on parts we did, but then we never really cut anything thicker than 0.500 (I work as a fabricator)

Originally Posted by isotopesope (Post 6154691)

thacher,
did you get a quote on the jetted dropouts? i'd wager just buying some pre made ones would be cheaper in most instances. if you HAVE to have your design, perhaps get some quotes at local machine shops in your town.

i wonder if the shimano track ends are still made? they are so simple and really handsome, imo.

my friend danny just took the frame class at ubi. he brazed a geared 29. was he in your class?



those are sweet.



we've had some .625" to 1.5" thick steel plates cut and the results weren't too precise... but we didn't need it to be for what we were doing to it later...

what i mean about the kerf making the cut wavy, is that as the kerf (the waterjet's shape for those who don't know what a kerf is) was moving through the material, by the time the water made it through the bottom of the material, the jet's head a little further along in the cut. in a sense, not a fully rigid cutting axis. the problem was worse in tight radii. they have these new waterjets with a 5 axis head that can make adjustments to compensate for it. i'm sure machine hours on one of those would not be cheap, and still not worth it, in my opinion. unless maybe i need to see more waterjet stufffz.

the screenshot is of the cad model i made of ground up dropouts. eric has had them made by several local shops before, but they've all moved, closed, etc. so i'm taking it on, starting this month. i'm looking forward to it, but i still have a lot of computer time before chips can fly. +/.005 is definitely fine for dropouts... paint clearance.

Originally Posted by doomkin (Post 6154847)

courage bicycles:

http://farm3.static.flickr.com/2010/...8f7b74.jpg?v=0

http://farm3.static.flickr.com/2034/...45e7af.jpg?v=0

Originally Posted by thatcher (Post 6154876)

i sorta got a quote which was its 150 an hour. plus a million things. so yeah i just want custom trackends n probibly will make more. still dont have an idea what to do though.