thanks moldmaker74, i can measuring the gear in different way, but i don't really know how to make adjustment base on the result graph. now i am still concentrating to analysis the relationship between these. but, simultaneously, i would like to try to use CAD/CAM warez to help me to present/discuss the modification instruction to/with mould maker (untill now, we just send the result data to mould maker, then they will help us to solve the backend problem, quote us to make a new parts or etc......so passive...i am not going to do all the thing in one place but i want to know more about the principle on the work-flow, so that we can easier to face customer/end user or etc...) ---here i would like to share my experiment--- i am trying in a common Spur tooth with JGMA standard level 4-5 as below: 1.this gear can meet the requirement by using mastercam c-hook and setting offset for shrinkage ratio: 2.this gear CAN NOT meet the requirement by using the same way as 1: **the parts were measured by actually moulded parts is there any idea to guide me to find out the problem... Thanks all,

sorry all,during the tw earthquake, i can't connect internet to outside country a whole day... hi edmBosto, i am interested on that is your proportional ratio always make the target precision level? let a involute curve gear be example, material is pom and the shrinkage ration i set to 1.018(as i want to make as max as), after made the mold and produced a gear, everything of the jis requirement such sharp, tooth line tooth mark, pitch etc is inspec, but it will out of spec when it measuring with the mastergear. In this case, any idea/suggestion to solve. or the measuring way... by the way, is there some ref. matter for JISB1701 standard can i found in the web ?! thx

offset ?? the shape will be change and it will affect the JGMA data i think. actually i have such experience, the precision(line and shape) is ok, but it bad in JGMA data that measuring by master gear...

thx william, but, is that the teeth will shinking in different direction when injection. so that i have to select the teeth only for xform ?! by the way, i have a JISB1701 gear drawing, do you know what is this standard stand for. And, is there a brief description for the gear c-hook. i mean the pitch diameter, roll diameter, etc... since i can't found all the value for the input box. best,

dear all, just a newbie here need help! Is there any info or idea for drawing a gear for wire-cut that also can adding shinkage ratio for plastic injection. thx