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General Mach Discussion / Need Mach3/CNC help Please
« on: July 18, 2015, 01:42:47 PM »
A couple of weeks ago I lost the computer on my CNC machine. Since then I have replaced it with a Windows 7
32 bit computer with parallel port. Since I lost my files I had to reconfigure it, calibrate the motors,
and restore the tool table. All that done I ran some axis lop tests on all 3 axes, worked fine. I thought
I was good until:
I made a test pattern model and ran it through Bob Cam. THe pattern is simple, a 3.25 square cut .25 deep,
and a 3.00 Dia. circle .125 cut .125 deep on top of the square. Everything went fine for the square, but
when I cut the circle what I saw seemed like the center of the circle was incrementing to the -X for each
pass. The depth of cut was .025 per pass.
The first time I ran the code, the circle migrated about .25". Puzzled, I went to the Mach manual. Read
the section about motor tuning again. I cut the max speed and increased the acceleration time. THis helped,
the second time I ran the part, the migration was about 1/3 from the first. So I did it again. I cut the max
speed to way below what I was using before the computer crash. Also increased the acceleration time. Ran the
code again and found the migration was a little worse. So it seems inconsistent, and with the new settings,
probably not motor tuning related.
In Windows I checked the CPU, disk, network, and memory usage while the motors were running, all seemed to be
very low, less than 10%, so I don't think windows is to blame, I was concerned about background processes
interfering with Mach 3. Probably not.
I am running out of ideas, can anyone help please?
maury
32 bit computer with parallel port. Since I lost my files I had to reconfigure it, calibrate the motors,
and restore the tool table. All that done I ran some axis lop tests on all 3 axes, worked fine. I thought
I was good until:
I made a test pattern model and ran it through Bob Cam. THe pattern is simple, a 3.25 square cut .25 deep,
and a 3.00 Dia. circle .125 cut .125 deep on top of the square. Everything went fine for the square, but
when I cut the circle what I saw seemed like the center of the circle was incrementing to the -X for each
pass. The depth of cut was .025 per pass.
The first time I ran the code, the circle migrated about .25". Puzzled, I went to the Mach manual. Read
the section about motor tuning again. I cut the max speed and increased the acceleration time. THis helped,
the second time I ran the part, the migration was about 1/3 from the first. So I did it again. I cut the max
speed to way below what I was using before the computer crash. Also increased the acceleration time. Ran the
code again and found the migration was a little worse. So it seems inconsistent, and with the new settings,
probably not motor tuning related.
In Windows I checked the CPU, disk, network, and memory usage while the motors were running, all seemed to be
very low, less than 10%, so I don't think windows is to blame, I was concerned about background processes
interfering with Mach 3. Probably not.
I am running out of ideas, can anyone help please?
maury