I've got a 1989 MAHO MH600C with Phillips 432 control and 4th axis. It has served me very well for the past year that I've owned it, but suddenly I'm getting a strange malfunction where the control freezes up in a manner that I cannot figure out. I can turn on the machine and set the 4 axes toward their reference points; when I do this, all four axes move properly but once they get to their reference point locations the control freezes up.
When the control is frozen, I can cycle E-stop and then power-on + clear twice to get the control unfrozen.
Once I've unfrozen it I am not able to jog XYZ axes, but can still jog the 4th axis. When I let my finger off the 4th-axis jog button the control freezes again and the 4th axis does not engage the hydraulic brake like it should.
Another thing that I can do when the control is unfrozen is that I am able to move the XYZ axes 0.1" at a time by putting it into 1000 step mode and pressing any of the 6 +/- buttons for the XYZ axes. When I do this, the machine makes the movement, but then freezes after it moves 0.1"
If I do this 10 times in a row (move 0.1" and then unfreeze machine again) then I can get enough clearance (1") to make a running start at the reference point again. I unfreeze the machine and send it toward the reference point on the axis in question -- it behaves as it should but then once it gets to the reference point the control freezes again.
I hope I'm describing this behavior adequately.
A few things to note which may somehow be relevant: I've got a lot of weight on the table. In order to compensate for this, I have adjusted the machine constants to slow down the max rapid speed on all axes, which has helped me avoid position following errors on the Y-axis (which is the axis which moves the table up and down). Slowing down the rapid speeds and max feeds has been a good stopgap measure, but I noticed that over the past few months I've needed to keep slowing it down further every few weeks in order to avoid errors. Lately I also have needed to manually jog the Y-axis up and down at 75% for several minutes before I can get it to jog up at 100% of the already reduced feedrate.
Taking that history into account, I suspect that the drive for my Y-axis may be wearing out, and I'm wondering if this new behavior of the control freezing is perhaps related somehow?
FYI, this is the exact same machine referenced in this thread:
http://www.practicalmachinist.com/v...ho-cnc/89-maho-mh600c-y-axis-problems-289077/
In that thread, he mentions that he also had a lot of weight on the table and that he had to replace the drive for the Y-axis. Perhaps it's time to replace it again?
Thanks in advance for any help or suggestions that anyone can give me.
When the control is frozen, I can cycle E-stop and then power-on + clear twice to get the control unfrozen.
Once I've unfrozen it I am not able to jog XYZ axes, but can still jog the 4th axis. When I let my finger off the 4th-axis jog button the control freezes again and the 4th axis does not engage the hydraulic brake like it should.
Another thing that I can do when the control is unfrozen is that I am able to move the XYZ axes 0.1" at a time by putting it into 1000 step mode and pressing any of the 6 +/- buttons for the XYZ axes. When I do this, the machine makes the movement, but then freezes after it moves 0.1"
If I do this 10 times in a row (move 0.1" and then unfreeze machine again) then I can get enough clearance (1") to make a running start at the reference point again. I unfreeze the machine and send it toward the reference point on the axis in question -- it behaves as it should but then once it gets to the reference point the control freezes again.
I hope I'm describing this behavior adequately.
A few things to note which may somehow be relevant: I've got a lot of weight on the table. In order to compensate for this, I have adjusted the machine constants to slow down the max rapid speed on all axes, which has helped me avoid position following errors on the Y-axis (which is the axis which moves the table up and down). Slowing down the rapid speeds and max feeds has been a good stopgap measure, but I noticed that over the past few months I've needed to keep slowing it down further every few weeks in order to avoid errors. Lately I also have needed to manually jog the Y-axis up and down at 75% for several minutes before I can get it to jog up at 100% of the already reduced feedrate.
Taking that history into account, I suspect that the drive for my Y-axis may be wearing out, and I'm wondering if this new behavior of the control freezing is perhaps related somehow?
FYI, this is the exact same machine referenced in this thread:
http://www.practicalmachinist.com/v...ho-cnc/89-maho-mh600c-y-axis-problems-289077/
In that thread, he mentions that he also had a lot of weight on the table and that he had to replace the drive for the Y-axis. Perhaps it's time to replace it again?
Thanks in advance for any help or suggestions that anyone can give me.