[Ia...] Posted November 7, 2019 Share Posted November 7, 2019 I am trying to evaluate a gear profile using Curve. The images show the same series of teeth with Best Fit ON, and Best Fit OFF. With Best Fit ON, there are a number of points missing. Can anyone tell me what exactly Calypso does when applying Best Fit in this situation? Link to comment https://qualityforum.zeiss.com/topic/17300-best-fit-what-does-it-do/ Share on other sites More sharing options...
[Ri...] Posted November 7, 2019 Share Posted November 7, 2019 When you turn on Best Fit, are you restricting any axis, or is all of them selected? If you have them all selected, I would strongly suggest not to do that. If this is a gear, and say it's in the XY plane, only let it translate in the X,Y, and rotate in the Z. See if that helps you. In addition, there is a limit for search for best fit in the Evaluation tab, you can increase/decrease this if needed. Link to comment https://qualityforum.zeiss.com/topic/17300-best-fit-what-does-it-do/#findComment-96916 Share on other sites More sharing options...
[Ia...] Posted November 7, 2019 Author Share Posted November 7, 2019 Ok, under Translation, I un-selected Z plane, and left X and Y selected. Under Rotation, I un-selected X and Y, and left Z remaining on. I didn't do anything with the search limit as the default is 0.190". I'm getting totally different results now. I'm still foggy on what Best Fit actually does, and how to interpret the results. Link to comment https://qualityforum.zeiss.com/topic/17300-best-fit-what-does-it-do/#findComment-96918 Share on other sites More sharing options...
[An...] Posted November 7, 2019 Share Posted November 7, 2019 Seems to be a graphical thing. Reduce the point density. See attached.Contribution_07_11_2019_a.pdf Link to comment https://qualityforum.zeiss.com/topic/17300-best-fit-what-does-it-do/#findComment-96920 Share on other sites More sharing options...
[Ia...] Posted November 7, 2019 Author Share Posted November 7, 2019 Hmmm.... That could be. I went with a lot of points for this curve (6000) hoping to get the best resolution. Link to comment https://qualityforum.zeiss.com/topic/17300-best-fit-what-does-it-do/#findComment-96922 Share on other sites More sharing options...
[He...] Posted November 9, 2019 Share Posted November 9, 2019 Just invest $10 - $20 000 in a GearPro license and save yourself a ton of grief. In my experience Curve is no way near stable enough to verify gears. Link to comment https://qualityforum.zeiss.com/topic/17300-best-fit-what-does-it-do/#findComment-96924 Share on other sites More sharing options...
[Ri...] Posted November 10, 2019 Share Posted November 10, 2019 I don't agree with that statement. Curve is great for Gear Profile inspection, but you have to take the time to get the setup correctly. Like this case, you wouldn't want to do a full tooth profile. There is a section that you would scan radially for the Profile (from a certain diameter to a certain diameter). Then a section that you would scan axially for the Helix (at a certain diameter). There is a Pitch function inside of Calypso to take care of tooth-to-tooth error. Finally, just a couple of circle for the tip and root. The problem that I've ran into in the past is that people model the spline/gear at MMC, so you would need to shift your tolerance to account for that. . . GearPro definitely makes it easier, I agree, but all of this can be done inside of Curve. Link to comment https://qualityforum.zeiss.com/topic/17300-best-fit-what-does-it-do/#findComment-96926 Share on other sites More sharing options...
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