Quote:
Originally Posted by Oblarg
I pulled the CAD of bbman's website, with the hope that the profile is correct (or close enough to correct that it'll work, the fact that their CADs have different profiles for HTD and GT2 pulleys seems to indicate that they're not just using a single erroneous profile for all of them).
I had heard that other teams had successfully machined pulleys from CADs obtained this way, so it seems worth a shot.
If it doesn't work, I'll check out the parametric pulley link nicholsjj posted (thanks for that, by the way) - though I don't have OpenSCAD on my computer right now.
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See attached picture. Material is ABS. No idea what the specs were when they were printed...whatever our sponsor had set up for whatever they had recently made.
I copied the GT2 profile off one of the websites (sdp-si maybe? it's been so long now I don't remember) and the printed pulley meshed very nicely with a GT2 belt. Just haven't had the ability to test the strength of the pulleys on a drivetrain yet. The printer I have best access to is an FDM...great insight mentioned above. For a drive pulley (off a gearbox) my plan was to mate an AM hex hub to the printed pulley (similar to what AM currently lists on their website for the 2013 chassis). I would add another circular hole pattern to drill and tap for #10-32s on the AM hub. The wheel pulleys I was planning on attached to a WCP dead axle hub. The side you can't see (resting on the table) has a bore for an R8 bearing. An R6 bearing would go in the WCP hub. No chance to test these yet to see what breaks...hopefully soon.