Is GearPro model accurate?

[[He...]]

Hello

I'm trying to create a parameterized model in my CAD-software to create involute gears and splines. Since I'm not an expert in the beatiful world of gear geometries this is rather complicated. I have created something that I think is correct but it would be nice to have a way of verify this and I'm thinking about GearPro. When defining a gear or spline in GearPro it will generate a model that can be exported.

 

My question is. Does anyone know whether this model is correct and accurate according to mathematically perfect gears and splines. I have made some tests and with addendum modification set to 0 my attempt and what GearPro produces is more or less indentical. Differences of <0,0001 mm.

When I try to use addendum modification GearPro seems to just rotate the basic profile with an amount that will create a correct tooth thickness. Is this the correct thing to do? Of course the root and tid diameters will also change but right now I'm just talking about the complete involute profile.

To me this seems a bit to simple compared to everything else regarding gears but I will happily accept it if that is the case 🙂
 

[[Ch...]]

I think in most cases yes, as long as data is input correctly (including addendum mod., etc) especially in the newer Nx engine. I've used it for gear and spline cad modeling as well. I think it uses the generated involute & CAD for measuring the nominal, so it would have to be correct per the specs (ISO/AGMA, etc).

You can also output to Calypso and take a slice at any height, and output the 2d curve points pop into excel, etc for a comparison, which it looks like you may have already done.

 

Roman should be able to provide further info.

 

 

[[Ch...]]

Also instead of Add Mod try using the DOP or tooth thickness in Gear Pro from the print value. I have seen Add Mod incorrect may times on a drawing, wrong sign or too many decimal places or X but should be Xm, etc.