Mold for gears?

[cordvision]

I planing on making a mold for Mod. 0.8 gears (pitch 32). I fear that I won't be able to eject the part without without some draft. How are gears usually molded, do you apply a draft angle? If so, how much?

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[Concepts_Design]

I'm not positive but I since the gear teeth are on the outside, they shrink away from the wall so as long as you have sufficient ejection, it's not a problem. gears made out of resins such as acetal have such a high shrink rate that it would shrink away even more. Not really positive as I've never designed any molds for gears, but is logical for molding any part really. I have designed tons of molds with not draft on the OD of the part and never a problem. No draft on the ID will most likely be a problem though.

[cordvision]

Thanks for the info. Will try without draft