Refit of old CandCNC Machine

[firepilot]

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

[martyscncgarage]

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

[firepilot]

Thanks,

Will give her a good check over.

Phil

[firepilot]

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

[cnckeith]

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

[firepilot]

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

[firepilot]

Hey All,

Here is a picture of the cut I am getting.

Edited. Please see picture 2 posts below.

Thank you

Phil

[firepilot]

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

[martyscncgarage]

The part looks stair stepper diagonally....

[firepilot]

Cropped the picture to better show the issue.

Thank you

Phil