Centroid Community CNC Support Forum

Hey,

The drives are Dyn4 and the motors are DMM 750oz Ac Servo. I will go back and check the pulleys and see if there is anything.

The steps are set as per the setup If I recall correctly.

Thank you

Phil

DYN4s unlikely to be the cause of the problem. They should have no problem with the job. I would check all mechanicals

Thanks,

Will give her a good check over.

Phil

Seems to be a belt tension issue. I tightened the tension and it’s 98 percent better. Will adjust again tomorrow and hopefully get it spot on.

Thanks for the direction

Phil

check the pulleys for sure! use sleeving locktite on the axis drive pulleys! put a dab on the pulley to shaft interface.
https://amzn.to/2GIwydO

Gear we use but don't sell.
https://www.centroidcnc.com/centroid_di ... _gear.html

Hey all,

I have been doing too many things and got back to the CNC this weekend. I am still having some issued with my X-axis stepping over on each progressive cut to depth.

So to recap things when I do a pocket function for example if I make the pocket 2 inches by 4 inches and 1/2 inch deep it is programmed for 4 passes.
The first cut is 2 x 4 and .125 deep. The second pass is the same size but it moves to the positive x-axis direction 1/16 inches. The next pass moves over 1/16 and so on.

The finished cut is stair-stepped on the left side and 4.25 wide measured at the top even with the first cut.

I have ruled out any slop in the motor drive end of things and measured backlash at .0010. I have made the compensation in the configurations. And it still makes no difference. I have experimented with the backlash and it seems to not make a difference.

I have done the coarse and fine DRO settings. I am currently at .002 over a 35" measured distance.

I am at a loss on what to check next. Super frustrated.

Test drawings are being made in Vcarve pro using centroid post-processor.

This machine is running DMM DYN 4 drives and their servos.

There is no similar thing occurring in the Y-axis. When I do a square or other size part the size on the first cut is exactly the right size in the x and y axis. The depth of the cut is right on as well.

Open to all suggestions.

Thank you

Phil

Hey All,

Here is a picture of the cut I am getting.

Edited. Please see picture 2 posts below.

Thank you

Phil

I have gone back and reread some posts from before when this issue raised its head.

This is happening on every program I run which is a pocket program. The issue is there during a profile operation but not as bad.

It is only on the X-axis. no problem on the y-axis or z-axis.

Thanks for the help.

Phil

The part looks stair stepper diagonally....

Cropped the picture to better show the issue.

Thank you

Phil