I just completed the spindle break-in procedure, and I was surprised by the amount of vibration around 7000rpm while running the break-in program. I’m wondering what amount of vibration is typical with the MR1. I tried pushing the carriage in the X direction and with about 20 pounds of force the vibration stops (applied force to the cast iron part, not the spindle). When applying the same pressure perpendicular to the X axis there was no change in vibration, which leads me to conclude that the vibration is originating from the X ballnut. At lower rpms there was little to no vibration, and at 8000 rpm there was significantly less vibration than there is at 7000 rpm. I measured the X backlash and it is around 3 tenths.
When my belt was loose it vibrated but its tight now, still vibrates.
Before running the machine for the first time, I reassembled the entire z axis and spindle to tighten and align everything better. I also notice that the servo mount vibrates a little. Maybe that is the source of vibration that is resonating in the ballnut. I’m not sure what the proper tension for the belt is. The belt and servo mount were completely loose upon arrival. When retightening it I gently pulled the servo motor towards the front of the machine while tightening the two allen screws that hold it in place. Another possible explanation is that the spindle shaft is out of balance and causing unnecessary vibration, not sure.
1 Like
ive been chasing a similar vibration and have already replaced the spindle with no change. i ran the motor outside of its mount and found that a lot of vibration is generated when running. i suspect my pulley is way out of balance or something like that. As of right now i haven’t figure out how to take the pulley off to balance it or what to do next.
Typical tension for a timing belt is 1/2" deflection at the midpoint. There’s a slot on the left side of the belt housing for testing the tension of the belt. You can measure the deflection of the belt from that point.
1 Like