Messages

21

General Mach Discussion / Re: Slaved X and A Axis Problem

« on: November 30, 2014, 06:20:29 PM »

Progress... I put a belt drive on each of the X and A axis to reduce the motor speed in half. I made sure there was no mechanical slippage by filing a flat on the shaft of the motor and ball screw shafts.
I ran a simple test pattern to put a 1/4 inch hole in the corners of a 10x10 square and I have 1/4 inch dowel pins for measurement. No matter how many times I run it, the A axis is ALWAYS .015 shorter
than the X axis. I retightened all the pulleys but to no avail. Then I switched the two axis wires on the Gecko G540 to see if was the driver. The same side was still short......
I have run out of ideas to try....Could the motor/motors be bad???
Any help would be greatly appreciated.

22

General Mach Discussion / Re: Slaved X and A Axis Problem

« on: November 22, 2014, 07:26:01 AM »

OK, slept on it last night....What if I used one of my original motors, tied to two axis together and geared it down by half. That would essentially put double the
load on the motor and allow it to turn 1/2 as fast at higher velocities..
Do you think that would work??

23

General Mach Discussion / Re: Slaved X and A Axis Problem

« on: November 21, 2014, 10:19:41 PM »

I had that feeling when I started to run all the numbers and saw that the motor had to run high velocity to get anywhere.....
I'll have to decide now based on finances!!!
Thanks
Art

24

General Mach Discussion / Re: Slaved X and A Axis Problem

« on: November 21, 2014, 09:51:24 PM »

.19685 inch/turn

conversion from metric.....

25

General Mach Discussion / Re: Slaved X and A Axis Problem

« on: November 21, 2014, 09:40:32 PM »

Thanks Gerry,
I'm kind of stuck with the setup I have now. It looks like the Gecko won't go past 50V and I'm at 48. Kind of maxed out there.
What steppers would you suggest based on the Gecko???
Before I do that I'll change the pulse and see what happens...

26

General Mach Discussion / Re: Slaved X and A Axis Problem

« on: November 21, 2014, 02:25:46 PM »

Thanks for the reply,
Not sure I can do that with the Gecko 540....

27

General Mach Discussion / Slaved X and A Axis Problem

« on: November 21, 2014, 01:56:58 PM »

Hello,
New to forum and first post...
I have a DIY 30x40 cnc based on CNC parts machine. I'm running slaved ball screws on the x axis and nema 23 425oz/in motors.
My problem is that the two sides (x and a) do not run perfectly in sync. If I run the calibration test on the left side of the machine, it will not be the same on the other side.
I've turned the velocity way down and still have a problem. The question is, in the Mach motor setup, can the steps be different on the slaved axis to compensate for the difference in the
movement side to side of do they have to be identical. I did notice that when I calibrate the x axis, the correction only appears on the x motor and not the A. If I try to calibrate the A
axis by itself, the motors do not turn.
At this point I have many hours trying to solve but have not come up with an answer yet.
Any help is greatly appreciated..
Thanks
Art