magneplanar
New member
Fellow Pro E users,
anyone built a mold for plastic gears? I am trying to explain to a coworker that the tooth profile may have a different shrinkage rate due to its concentration of material. That applying the nominal material shrinkage rate across the entire part may not be producing the tooth profile as intended. I read something where they say you should use the standard shrinkage as depicted in the material spec and then correct the cavity after measurement of the off tool part.
just wondered what experience there is...
we are working with small gears, less than 50mm diameter, with a gear and pinion on the same part. We also want to add in some phase shifting to compensate for the involute undercut on the pinions.
thanks...
M
anyone built a mold for plastic gears? I am trying to explain to a coworker that the tooth profile may have a different shrinkage rate due to its concentration of material. That applying the nominal material shrinkage rate across the entire part may not be producing the tooth profile as intended. I read something where they say you should use the standard shrinkage as depicted in the material spec and then correct the cavity after measurement of the off tool part.
just wondered what experience there is...
we are working with small gears, less than 50mm diameter, with a gear and pinion on the same part. We also want to add in some phase shifting to compensate for the involute undercut on the pinions.
thanks...
M