Gear Pro Rotor Filtering

[[Je...]]

Does anyone have advice or know of a standard that applies to filtering the lead and profile data within gear pro Rotor ?

[[Ow...]]

Not the answer you're probably looking for and I have no experience with Rotor but, in gear-pro, I usually use a wavelenght of 2.5 for profile and lead.
Right or wrong, the main reason I used 2.5 instead of the gear-pro recommended was that the results matched our Gleason Gear checker results best with 2.5 and worse with the 0.8 recommended and the Gleason was the time tested standard.
0.8 appeared to leave too much noise and that was on AGMA 11 (older standard) ground gears.

[[Ro...]]

In general the filtering method which all GEAR PRO options are using is a Gaussian low pass 50% filtering.
This method is described in several standards related to gears, e.g. ISO 1328-1, VDI 2612 part 1.
For involute gears the way to determine the wave length is described in those standards.
Easy answer, evaluation length / factor 30 = filtering wave length.
For rotors there exists no description or recommendation in a standard.
With GEAR PRO 2020 (6.4) the way of determining the filtering wave length is based on the way how to determine at involute gears. That means you have now an automatic way depending on the evaluation lenth alternatively to the manual setting of a filtering wave length.

[[Je...]]

Thanks Guys

[[Ch...]]

I can confirm there is no comprehensive filtering standards for the lead and profile on helical rotors.

[[Ri...]]

I always got screamed at by the Germans for using filters in gear measurement. 🙁 🙁

[[Ma...]]

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Pretty much all helix and profile data is filtered -mechanically, electronically or mathematically, or some combination of the three. The current state of the art is finally letting the user select and/or know what mathematical filter is actually being used.

I think that's a good direction to go.