Mazak X Axis - YouTube
Has anyone with this type of machine seen this before or know what causes it?
Has anyone with this type of machine seen this before or know what causes it?
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ST35 X axis load oscillations - T32-3 control
- Thread starter AMThomas
- Start date
- Replies 4
- Views 2,002
hitandmiss
Titanium
- Joined
- Jul 31, 2010
- Location
- Rochester, NY USA
If it has DC servos, I would check the brushes.
You miss the position display completely in the video.
Can't tell if the position is changing a thou or so with the fluctuations.
So a careful inspection of the wiring to the axis motor and encoder, looking for breaks needs to be done.
Bill
You miss the position display completely in the video.
Can't tell if the position is changing a thou or so with the fluctuations.
So a careful inspection of the wiring to the axis motor and encoder, looking for breaks needs to be done.
Bill
More information:
The machine holds position and makes good parts. Recently had the ballscews and ballnuts rebuilt, new bearings installed. We had a Mitsubishi tech come down and look at it, did some swapping out of parts - drive, servo motor, encoders, encoder cable - but none of those things had any effect on the problem. Also checked the servo motor (AC) with a megaohm meter - infinity to ground on all phases and it measured 2 ohms phase-to-phase
It's a belt drive system with an encoder on the servo and a second encoder on the ballscrew. the couplers were good and tight on both encoders.
The next time the machine's not in service, I'm going to check the ballscrew pulley & key. I'm thinking we replaced that when we did the ballscrew rebuild, but I'm not 100% for sure..
The machine holds position and makes good parts. Recently had the ballscews and ballnuts rebuilt, new bearings installed. We had a Mitsubishi tech come down and look at it, did some swapping out of parts - drive, servo motor, encoders, encoder cable - but none of those things had any effect on the problem. Also checked the servo motor (AC) with a megaohm meter - infinity to ground on all phases and it measured 2 ohms phase-to-phase
It's a belt drive system with an encoder on the servo and a second encoder on the ballscrew. the couplers were good and tight on both encoders.
The next time the machine's not in service, I'm going to check the ballscrew pulley & key. I'm thinking we replaced that when we did the ballscrew rebuild, but I'm not 100% for sure..
wippin' boy
Diamond
- Joined
- Sep 14, 2005
- Location
- il.
does this machine have box ways with gibbs?
have they been adjusted?
have they been adjusted?
wippin' boy,
This machine does have box ways. The gib closest to the chuck was loose - looked like someone made a homemade retainer behind the gib adjustment screw that came loose.
Since the adjustment was already lost, I pulled the gib out and took a couple pictures of it before I put it back in..
I haven't had a chance to go check on the machine since I did the adjustment. I will post back with results when I am able.
Thanks,
Aaron
This machine does have box ways. The gib closest to the chuck was loose - looked like someone made a homemade retainer behind the gib adjustment screw that came loose.
Since the adjustment was already lost, I pulled the gib out and took a couple pictures of it before I put it back in..
I haven't had a chance to go check on the machine since I did the adjustment. I will post back with results when I am able.
Thanks,
Aaron
