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12th September 2016, 03:23 AM #1
Intermediate Member
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X and Y axis intermittent jamming
Hi,
We have a CNC 3020, on which the X and Y axis intermittently jam or stutter. The machine has had perhaps 40 hrs operation since new. The fault does not occur at the same spots in travel each time.
I looked for posts on this and found several reporting a lack of lubricant in the linear bearings and ballscrews, so disassembled them. That was indeed the case as no lubricant at all was visible. I used a Nulon PTFE light grease to supply this and reassembled.
The problem was improved but still there. One thing I noticed was
that when jamming the axis screw could be turned by hand using the large knob on top of the axis motor, unlike the normal powered up condition when it is locked. This however would not clear the jam.
At that I began to wonder if the fault is electronic in nature, not mechanical. Has anyone struck this with a 3020?
Thanks
Geoff
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12th September 2016, 01:24 PM #2
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If you can rotate the stepper by hand then there is loss of power to the stepper.
1. Check the connections, plugs etc.
2. Inside the controller (Power unplugged) check the connection screws for tightness.
3. Check and clean the connection from the pc.
4. Check your power supply.
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12th September 2016, 08:09 PM #3
Senior Member
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If your still using the stock cables to the stepper motors replace them - The stock ones are poorly shielded (if at all) and have a tendency to intermittent breaking. Also replace the cable going from the VFD to the spindle if you're set up like that. The poor shielding on both can cause noise, which will trip up some controllers and cause erratic behaviour, such as stalling, lost steps, or complete loss of control.
The cables sold by Homman Designs are really good.
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14th September 2016, 07:29 PM #4
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Thanks,
It has indeed turned out to be electronic, being a faulty or below par parallel interface in the PC. On swapping the PC around, the problem disappeared, and the little machine seems to appreciate its lubrication.
Cheers
Geoff
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14th September 2016, 07:44 PM #5
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For lube I use the motorbike chain oil spray cans.
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