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Thank you for all the input!!! After the holiday I will be looking into this further to see if the involute part i downloaded can actually work with what we are designing! :)

I am using NX 9 and can not open that file SDETERS.

I think that should be the file... I am new to the site so unsure if i did this correctly. Thanks for the help!! :)http://files.engineering.com/getfile.aspx?folder=90ca8d30-1323-47a5-ae4b-0641ec032997&file=Involute_curve.prt

Yes, invalid string. I had used the part file as a linked composite curve and it failed. So I went into the part itself and chose the law curve and it had the same error.

Ok - T expression untouched! :) Why can't i use the extrude function and have this involute as the driving curve to build it?

Hi! I have gotten access to a file "involute_curve.prt" and was wondering if you could help figure out how to change it. I am unsure what 't' represents. I am fairly certain 'r' is my generating radius. Can you help? Please and thank you! - Kim