Modeling Helical Gears for CMM
Modeling Helical Gears for CMM
(OP)
This is bit of a solid modeling or inspection question, which way do you model gears/worms for the most accurate output? We are outputting gears for CMM inspection programs and I am a little confused in my typical modeling style as to which way would produce a more accurate gear profile for inspection. Do you model the gear profile parallel/perpendicular with the cylinder axis or do you use a plane to draw the profile perpendicular to your line of helix before using a cut-sweep to remove material from the main body.
I'm having a brain-fart or logical argument issue either way, any insight would be helpful.
Thanks
I'm having a brain-fart or logical argument issue either way, any insight would be helpful.
Thanks





RE: Modeling Helical Gears for CMM
Are CMMs accurate enough for gear inspection?
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JHG
RE: Modeling Helical Gears for CMM
RE: Modeling Helical Gears for CMM
RE: Modeling Helical Gears for CMM
I don't know what specific equipment OP has access to, but we have a Nikon system that is accurate to 1.5 micron.
I would imagine that for measuring gear teeth you would want a non-contact system, which could get you to 5 micron or less.
RE: Modeling Helical Gears for CMM
1) Per the gearing standards. Or you can buy a gear inspection software or gear modeling software and get going now.
2) Yes, CMMs are capable of measuring gears, with some limitations. We measure up to AGMA 12 quality gears on our full sized CMM. The gears are much smaller than the CMM table, so accumulated error over long movements is not a factor. It takes all of the available accuracy of the machine to do this. We confirm this with a master gear artifact that has a NIST certified inspection report.
Our system is driven by Zeiss Calypso and we use the GearPro software and rotary table options for gearing.
What AGMA quality are you attempting to measure? How large is the workpiece? What CMM do you have?
RE: Modeling Helical Gears for CMM
RE: Modeling Helical Gears for CMM