Wrong cut

[Dave_stoke]

Today I discovered that my VDF was set on CCW rotation and the cutter used for MDF was a right hand one. After changing to CW on MDF I get the right dimension.
However on the wood plate on a 40x40 square it's all perfect, but when I switched to a bigger 80x80 square I get again wrong dimensions 80x79.8.
Normally it should work also on a bigger square but at least half of the issue was solved.

It isn't hitting soft limits and closing down on that axis?

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[magicniner]

With such a basic error as running your spindle backwards I suggest you run through all your settings and calculations again and check X, Y and Z travel in several areas with a dial guage to ensure your calibration and and other assumptions are correct.

[driftspin]

Hmm probably you have checked this already.


Did you check for play on ballscrew angular bearings for the y-axis and x-axis.
The ballscrew locknut loosened on me earlier too... :-(

Does the problem move to the other axis when you turn the stock 90deg?

Grtz Bert



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[cncnescu]

I already checked the backslash and is max 0.03mm on all axis. When I cut a normal wood plate(acacia for ex) along the fiber I will get the right dimension and this I will get regardless of the fiber orientation of the wood plate if x along the fiber or y along the fiber. Against the fiber is always the wrong dimension.
In MDF bought dimension are more or less equal but bought wrong.

[cropwell]

What are your steps per mm settings for x and y axis ?

[cncnescu]

I checked this at the beginning and it was fine...320 steps/ mm, 1600 micro steps on the stepper drive, 5mm / rev on the ballscrew.The same settings for all axis