Micromill 2000 -Grinding Sound on Y
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Micromill 2000 -Grinding Sound on Y
When trying to home the machine, the Z axis homes fine. The Y axis sends the machine table to extreme left, makes a horrible grinding noise and does not stop. All this while the Y axis number continues to increase until the machine is manually turned off. I shut the computer and the milling machine off and restarted it and that did not fix the problem.
Micromill 2000 -Grinding Sound on Y
Sounds like the Home Switch for the Y-axis is not being depressed by the machine table. The switch may have moved slightly.
Turn the machine off. Use a vacuum cleaner around the switch then use compressed air to blow the remaining dust and chips out from the switch. You should then manually operate the switch several times quickly, you should hear/feel the contacts click as you operate the switch. You can also check the switch with a volt/ohm meter to make sure the contacts are opening and closing properly, if not a new home switch will be needed.
If the switch checks out OK, then check to see if the table presses down on the switch lever enough to open the contacts. The switch may just need a little adjustment, loosen the bolts and move the switch so that the lever presses down when the table moves to its home position. You can use the “Secret Home” function to move the machine table away from the switch to work on it, viewtopic.php?t=53&highlight=secret
You will need to re-home the machine and reset your work offsets.
The machine homes by moving to the switch. When the machine pushes the switch the contacts “open”, then the machine slowly backs away from the switch until the contacts “close”, now it knows it is at “Home”. When you “Home” the Z & X axis you will see the machine move to the switch then slowly back off. If you use the secret home and jog the Y away from the switch then click on the Y Home button (you will be able to manually push on the switch to open the contacts). The Y axis should start to back away until you release the switch (close) then stop. The machine will think the Y is homed.
Turn the machine off. Use a vacuum cleaner around the switch then use compressed air to blow the remaining dust and chips out from the switch. You should then manually operate the switch several times quickly, you should hear/feel the contacts click as you operate the switch. You can also check the switch with a volt/ohm meter to make sure the contacts are opening and closing properly, if not a new home switch will be needed.
If the switch checks out OK, then check to see if the table presses down on the switch lever enough to open the contacts. The switch may just need a little adjustment, loosen the bolts and move the switch so that the lever presses down when the table moves to its home position. You can use the “Secret Home” function to move the machine table away from the switch to work on it, viewtopic.php?t=53&highlight=secret
You will need to re-home the machine and reset your work offsets.
The machine homes by moving to the switch. When the machine pushes the switch the contacts “open”, then the machine slowly backs away from the switch until the contacts “close”, now it knows it is at “Home”. When you “Home” the Z & X axis you will see the machine move to the switch then slowly back off. If you use the secret home and jog the Y away from the switch then click on the Y Home button (you will be able to manually push on the switch to open the contacts). The Y axis should start to back away until you release the switch (close) then stop. The machine will think the Y is homed.
Micromill 2000 -Grinding Sound on Y
I was successful in moving the table, but the Y axis motor is still making the horrible grinding sound, and it stops when the table is roughly half way to the end of the threaded rod and the servo motor. The X axis appears to move normally.
Micromill 2000 -Grinding Sound on Y
Did you move the table with the “”Secret Home”?
The “grinding” noise is the stepper motor stalling, you can damage the control card if this keeps happening.
Which axis? You wrote “the Y sends the machine table to the extreme left.”
The Y front - back? Or X left – right?
The Backlash Nut and the Backlash Lock may be loose.
On the front of the carriage are 2 brass pieces that lock like thin gears, for the Y axis.
The one on the right is the Backlash Nut, it’s used to adjust the play in the threads of the lead screw.
The one on the left is the Lock, it has a bolt holding it in place. Check the bolt, see if it is tight. You need to adjust the Backlash Nut on the lead screw so that it is snug, not tight on the lead screw, and tighten the bolt in the Backlash Lock to keep them from turning.
The ones for the X are on the right side of the carriage under the machine table.
The “grinding” noise is the stepper motor stalling, you can damage the control card if this keeps happening.
Which axis? You wrote “the Y sends the machine table to the extreme left.”
The Y front - back? Or X left – right?
The Backlash Nut and the Backlash Lock may be loose.
On the front of the carriage are 2 brass pieces that lock like thin gears, for the Y axis.
The one on the right is the Backlash Nut, it’s used to adjust the play in the threads of the lead screw.
The one on the left is the Lock, it has a bolt holding it in place. Check the bolt, see if it is tight. You need to adjust the Backlash Nut on the lead screw so that it is snug, not tight on the lead screw, and tighten the bolt in the Backlash Lock to keep them from turning.
The ones for the X are on the right side of the carriage under the machine table.
Micromill 2000 -Grinding Sound on Y
It is definitely the Y axis servo motor, the backlash nuts are in tight, as they were when they arrived. The motor sounds like the gears are slipping and something inside the housing has broken or come loose. I will call for an authorized Denford technician to come for a service call. Thank you.