Okuma Cadet mate 4020 Z backlash

saadracing · Apr 17, 2019

Looking at purchasing an older 1998 Okuma Cadet mate 4020 and running some test on it showed a 0.0004" backlash in the Z axis. As soon as we get to the 0.0004" (moving in 0.0001" steps)on the control the indicator takes up the difference and they equal. The X and Y were less than 0.0001". We do mostly automotive parts and items with +/- 0.001" or more.

Also a draw bar test showed 1900# of pull force

Does anyone know what the tolerances are for this machine.

What level of concern would this be?

ifixcnc · Apr 17, 2019

Have you set the backlash parameter to 0? If not you are measuring the after compensation value.

saadracing · Apr 17, 2019

Yes. The technician said that was the best he could get

litlerob1 · Apr 18, 2019

For a 21 year old, .0004" in Z is pretty good by any standard.

R

ifixcnc · Apr 18, 2019

technician said that was the best he could get
Would likely indicate that is an after comp measure. As mentioned that is good for an older machine, but if the comp value is large the tool will move based on the amount of cutting force. That is why you want to measure with the comp off (0).

Other Brother · Apr 18, 2019

This machine was manufactured by ZPS, Czech Republic and Okuma added their control. Using the pulse handle to check and set backlash isn't accurate, you need to write a program to move in one direction, then set an indicator to zero, move in the same direction a small amount, then back the other direction the same amount. The difference on the indicator is the backlash amount. As stated above, set backlash comp to zero to see backlash.

The pull force is listed at 2204 pounds +/- 10%, but I think you are borderline good at 1900.

Other Brother · Apr 18, 2019

Okuma Machine Centers Tool Retention Specs

The link below has a list for retention force specs on Okuma Machine centers.

Notice the MCR near the bottom, I used my 5000 pound force gage on one of these, 7700 pounds.

Okuma Retention Force Specs

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Okuma Cadet mate 4020 Z backlash

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