round holes not exactly round.
- COFHAL
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05 Dec 2024 21:12 #316047
by COFHAL
round holes not exactly round. was created by COFHAL
I have a problem when making round cavities or holes. In the axes corresponding to the angles 0 -180 and 90 -270 the dimensions are correct, but in the diagonals the dimensions are no longer correct, in the diagonal 45-225 the dimension is smaller and in the diagonal 135-315 the dimension is larger.
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- hmnijp
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05 Dec 2024 22:01 #316053
by hmnijp
Replied by hmnijp on topic round holes not exactly round.
Your problem is caused by screw backlash
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- tommylight
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06 Dec 2024 00:17 #316063
by tommylight
Replied by tommylight on topic round holes not exactly round.
First make sure the scaling is correct for all axis, then check for backlash or loose screws or mounts.
Also check for mount deflection while machine is working.
Also check for mount deflection while machine is working.
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- timo
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06 Dec 2024 03:35 #316070
by timo
Replied by timo on topic round holes not exactly round.
How much "problem" is there? What type of machine? Even in CNC boring heads with a single point cutter are still "a thing".
Maybe your axis are not exactly perpendicular?
Can you measure it simehow?
I had huge backlash on my 2nd hand machine, the rubbers of the couplers between ball screw and coupler were "disappeared".
Another thing I found is a damaged bearing that keeps the ball screw in place. Then the complete screw can move a little.
Happy trouble shooting
Maybe your axis are not exactly perpendicular?
Can you measure it simehow?
I had huge backlash on my 2nd hand machine, the rubbers of the couplers between ball screw and coupler were "disappeared".
Another thing I found is a damaged bearing that keeps the ball screw in place. Then the complete screw can move a little.
Happy trouble shooting
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