Reasonable f_error value for knee mills.

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06 Apr 2020 23:52 #162986 by Doug Crews
Hello all you guys with knee mills.

I’m in the middle of tuning and am following the servo tuning procedure by Tommy. It’s looking and sounding pretty crisp, and I can tighten the f_error to .010” and the min _ferror to about .003” without tripping the error. I’m wondering what my expectations should be for the machine I have. It’s a Bridgeport style knee mill with Lead screws. I’m not all that concerned with rapid travel following error but I would like to think I would be able to keep it within a .001” at slower feeds or will I be chasing my tail try to achieve something that isn’t reasonable.

thanks for any feedback.

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07 Apr 2020 03:02 #163005 by PCW
Can you post some halscope plots of your tuning current tuning?

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27 Apr 2020 19:12 #165857 by andypugh
The point of the F-error limits is to stop the machine if things get seriously out of whack.

So What you really need to look at is the actual f-error during test cuts, and the accuracy of the measured parts.

And bear in mind that following error is typically along the line of the cut, so the actual geometrical error in the part won't directly correspond.

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