Quote:
Originally Posted by Cothron Theiss
That looks really interesting! Does it have to be 6 sections though? I feel like the fewer sections you can make it out of, the tighter your tolerances will be. Also, you might want to add in a different way of aligning and piloting your sprocket sections. It looks like you're just using the bolt holes, but those will not hold very tight tolerances, from the printer and to the actual fit. Maybe design in a boss or something similar to the Versakey pattern, or something where the edges of the sections meet so that they fit like puzzle pieces. Make it tight enough so it's a light press fit on an arbor press, and they'll align much more true to your design.
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I used 6 sections to keep the physical size of the part small so it would be more economical to print. I'm not sure if making larger sections would make the tolerance situation any better (or worse). The overall size seemed to be around 98% of what the actual size should be, and with their printing process, dimensional stability isn't an exact science. The overall sizes can change due to temperature, humidity and other factors. But I would like to get 6 of them printed to see if it really is an issue though.
I'all have to check on adding a boss. The aluminum would get waterjet anyway, so adding holes in there to fit a boss wouldn't be too hard.