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Author Topic: circles not round  (Read 222 times)

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circles not round
« on: March 12, 2021, 04:35:49 PM »
Hi first post here, been a member for couple of years, when I pocket circles they tend to be oval so I decided to try profile with a 15deg .01mm engraving bit and turns out that the start point is different to the end point, can someone please help would be much appreciated
« Last Edit: March 12, 2021, 04:44:09 PM by Wattie »
Re: circles not round
« Reply #1 on: March 13, 2021, 12:50:58 AM »
Hi,
interpolated circles will, and can only be, round if:

1) No backlash
2) No backlash
3) Correct steps per unit, both axes
4) No backlash
5) Related to 3), no missed steps in either axis, its equivalent to having incorrect steps per unit programmed. It as bad as backlash.....
have I mentioned that backlash prevents interpolated circles from being round?

Craig
My wife left with my best friend...
     and I miss him!
Re: circles not round
« Reply #2 on: March 13, 2021, 01:15:29 AM »
lol, im pretty sure i dont have backlash but if I did can I just put a Number in the box and see if it help, and if so what would a good starting number be i.e .1mm, I have never really had any luck with perfect circles but spindle always returns exactly to zero so I'm pretty sure I'm not losing steps

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Re: circles not round
« Reply #3 on: March 13, 2021, 02:25:16 AM »
IMHO you should find the reason first, before putting weird numbers into backslash compendation.
it is not only on circles, your first Picture Shows, that the rectangle is also not closed at the lower
right Corner. it Looks like the same amount like at the circle.
anything is possible, just try to do it.
if you find some mistakes, in my bad bavarian english,they are yours.