SeymourDumore
Diamond
- Joined
- Aug 2, 2005
- Location
- CT
Guys
Brother HS50-A Wire EDM.
In the last few weeks, while homing the machine from a cold powerup, X-axis overload alarm started popping up.
Power Off/On and restart the homing and it wemnt fine.
After that the machine ran for hours without any issues.
Then, as of last week there is no cure. Machine is always alarming for an axis overload.
After chasing my tail on mechanical causes ( removed, disassembled, cleaned, re0installed the X-axis ballscrew and ball nut, even removed all the balls ) the axis is about as smooth
as it will ever be or was.
After re assembly, the violent shaking is still there.
Obviously it is now electrical.
The X and Y axis drives are on the same board, so I just swapped the X and Y cables ( This is an EDM, so there are encoders as well as linear scales ) and tested the machine.
Lo and behold, the problem is now on the Y axis in the exact same way!
OK, next step: On this machine I can set the max. feedrate/velocity in the control. My allowed increments are .04, .40, 12.0 and 24.0 IPM.
If I set the max to .40000IPM, then the machine will move without any problems throughthe full range of the travel.
If OTOH I set it to 12.0 or 24.0, the alarm occurs immediately after I touch the Jog button.
If I unplug the linear scale, the axis motor will jog at full speed for approx 2 turns of the shaft, and then it comes up with an out of position error, but no axis overload.
If I don't touch anything, then the motor will comfortably sit where it is with the typical, ever so small back-and-forth "hunting" to stay in position.
Now, since this is a wire EDM, the motion "sensing" citcuit is incredibly fine. Literally, if you pump a greas gun into any of the fittings while the machine is in motion, you WILL get an Overload alarm!
So, in a nutshell:
Mechanical causes are eliminated.
Motor with encoder but no linear scale runs OK ( until position alarm )
Motor with encoder AND linear scale shakes the machine like tornado.
Any possible suggestions?
Thank You
Brother HS50-A Wire EDM.
In the last few weeks, while homing the machine from a cold powerup, X-axis overload alarm started popping up.
Power Off/On and restart the homing and it wemnt fine.
After that the machine ran for hours without any issues.
Then, as of last week there is no cure. Machine is always alarming for an axis overload.
After chasing my tail on mechanical causes ( removed, disassembled, cleaned, re0installed the X-axis ballscrew and ball nut, even removed all the balls ) the axis is about as smooth
as it will ever be or was.
After re assembly, the violent shaking is still there.
Obviously it is now electrical.
The X and Y axis drives are on the same board, so I just swapped the X and Y cables ( This is an EDM, so there are encoders as well as linear scales ) and tested the machine.
Lo and behold, the problem is now on the Y axis in the exact same way!
OK, next step: On this machine I can set the max. feedrate/velocity in the control. My allowed increments are .04, .40, 12.0 and 24.0 IPM.
If I set the max to .40000IPM, then the machine will move without any problems throughthe full range of the travel.
If OTOH I set it to 12.0 or 24.0, the alarm occurs immediately after I touch the Jog button.
If I unplug the linear scale, the axis motor will jog at full speed for approx 2 turns of the shaft, and then it comes up with an out of position error, but no axis overload.
If I don't touch anything, then the motor will comfortably sit where it is with the typical, ever so small back-and-forth "hunting" to stay in position.
Now, since this is a wire EDM, the motion "sensing" citcuit is incredibly fine. Literally, if you pump a greas gun into any of the fittings while the machine is in motion, you WILL get an Overload alarm!
So, in a nutshell:
Mechanical causes are eliminated.
Motor with encoder but no linear scale runs OK ( until position alarm )
Motor with encoder AND linear scale shakes the machine like tornado.
Any possible suggestions?
Thank You