Re: Upgrading Taig CNC with Geckodrive G540 to Closed Loop Steppers
Originally Posted by
jonpanic
Checked all 3 axis and they had resistors. I've noticed that my steppers make a lot of noise at idle, it's like a hum. I figured it was a noisy power supply, they seemed to operate normally. Thought it might be worth mentioning.
Thanks!
Hi,
There is no need to replace the G540 with a closed loop stepper system. You will just be wasting money. The G540 is a perfect match for a Taig. I have two Taig mills running on G540 controllers. The machines never loose steps. I also run a much larger machine of a G540 controller as well. Is a TM20VL, similar to the PM25VL. I can get rapids of 4000mm/min, although I’ve dialed then down to around 1500mm/min.
The axis will be stalling because of;
1. Resonance,
2. Too high acceleration
3. Max velocity is too high
4 Gibs are too tight
5. Gibs are too loose.
My guess is that it is either problem 1 or 2.
It may be that the steppers are stalling due resonance in the stepper motors. This is due to them not being tuned for the G540.
Each of the four axes in the G540 needs to be tuned for the stepper motor connected to it. On the back of the G540 there is a hole for each axis so you can adjust the trim pot accessible by the hole.
To tune the axis drive the motor at a feed rate so the motor is turning about two revs a second or where the stepper motor is at its noisiest. You will know it when you hear it.
Then with the axis at it’s limit of travel issue a G1 command in MDI to move it to the other limit of travel, i.e. G1 X300
Then, while it is moving adjust the trimpot to a position where the noise is at it’s minimum.
Do this for each axis.
Cheers,
Peter
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