MisterHW,

Whatever those "Yay I did a thing with #FreeCAD" folk are doing... I'm not getting it.

Making functional parts that have to come out right sucks.

Below is the scrap pile from trying to print a GT2 pulley that goes on a brushless motor.

chrishuck,
@chrishuck@fosstodon.org avatar

@MisterHW Are you having trouble getting the parts to print successfully? Or, is it a fit issue?

Both can be challenging, regardless of CAD.

MisterHW,

@chrishuck In this instance, it was actually a problem with the slicer settings, and https://wiki.freecad.org/FCGear_TimingGear seems to be okay.
Measuring the tip tip diameter was not a good was to determine proper settings.
Re FreeCAD: luckily not justified this time, but I just wasn't having the confidence that the WB actually produces the exact shape (no references given for the profile construction. https://forum.freecad.org/viewtopic.php?t=35899&start=50 addressed that but link rot set in)

MisterHW,

@chrishuck

https://forum.freecad.org/viewtopic.php?p=506803#p506803

See why I'm having trust issues here? What's missing is documentation on how the profile came about and ideally some way to validate the results.

How do we get away from "never believe FreeCAD does the right thing"?

image/png

MisterHW,

@chrishuck Probably someone will need to

  • check all profiles against standards or high quality references
  • make resin prints of a variety of pulleys and
  • document the results.
chrishuck,
@chrishuck@fosstodon.org avatar

@MisterHW I agree that workbench documentation should contain references to the standards (if any) that the geometry produced is based on. That would certainly help your confidence that model itself is not the problem when troubleshooting. It might be a stretch to have 3d printing specific info for the timing belt pulleys because it’s only one method of production. Printing considerations may not apply to machining.

chrishuck,
@chrishuck@fosstodon.org avatar

@MisterHW Shaft fits with 3d printing can be tricky if you’re trying to avoid post processing. I’ve definitely had to reprint things to get what I want after adjusting the model. I’ve found it beneficial to just print a portion of a part to figure out clearances before printing the whole part. Just part of the design process!

MisterHW,

@chrishuck That's indeed something I'm no longer fighting (especially since printing in mirror mode on an IDEX usually gives me different results when it doesn't use the same type of filament).
So I clean the holes up with a reamer afterwards. Beautiful results.

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