Has anyone done a tooth-to-tooth adjustment based on Gearpro results?

[[He...]]

Hello,

Again, still newbie here and learning. I guess I have 2 questions for this Topic. I will make another topic for the 3rd.

1) When you measure in GearPro, I measure Plastic Gears, does anyone on here make Tooth-to-tooth adjustments to their steel? If so, how do you go about doing it based off of the GearPro results? We take all of the data, Profile, Lead, Pitch, Left/Right, Top/Bottom, Tip Dia, Root Dia, MOW,

and we put all of those RAW numbers into an Excel sheet. See Example below.
2) How would you evaluate an internal gear? I ask this because I made a Tooth-to-tooth adjustment, and I fear I went the wrong direction. Data got better, but the person who made the actual WEDM moves on the tool, took my data and flipped my numbers.

Thank you in advance.

[[Ch...]]

Hi Heather,

Gear Wiz here : 😉

I actually started my career in a plastic gear shop ABA-PGT in Manchester CT, 12 hour shifts all kinds of gears from small to large.
Analytical + Composite testing.

Regarding tooth thickness and measurements over/under pins or wires : I would suggest only making CTT/CSW correction based off actual measurement/dimension over/under pins/wires.

This is assuming there is no major involute or lead/helix issues going on. If you have lead / profile issues its obviously better to correct those while you have more stock, then bring the tooth into size.

Make sure your parts are cool - at proper temp.

Regarding measuring actual MBW size on internal there are a few different tools, from internal mics, dyer gages, telescope gages + micrometer. They are a bit more tricky than external especially with odd teeth.

With aerospace steel parts I can get MOW/MBW result from Gear Pro very close to actual micrometer sizes provided part is of good quality, etc. However, even then I believe Engineers and machinists always go with their actual measurements.


The issue you show below is lead error and can come from a variety of things even more so with plastics...

plastic - I would recommend composite roll testing - more economical unless these are a high spec. class grade application ,etc.

Good luck, let us know if we can help further.