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Author Topic: Step losses in specific displacement  (Read 10393 times)

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Step losses in specific displacement
« on: July 30, 2007, 04:42:05 PM »
Hello,

I have a problem on my CNC machine that I couldn't solve for the moment.
With a certain combination of X and Y movements, I sometimes loose steps on the Y axis. It occures during a G0 movement and always on the same displacement (same combination of X and Y axis). The G0 speed is set lower than the maximum speed capacity of my machine and there is no mechanical problem.
It seems to have link with the frequency generated by this particular movement combination.
Does anybody have a clue how to solve this problem ?

Thanks
Jean-Louis
Jean-Louis

Hood

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Re: Step losses in specific displacement
« Reply #1 on: July 30, 2007, 06:41:57 PM »
Make sure enhanced pulseing is enabled
Hood
Re: Step losses in specific displacement
« Reply #2 on: July 31, 2007, 12:47:32 PM »
Hello Hood,

Thanks for your aswer.
I checked the enhanced pulsing and it is already enabled.

Jean-Louis
Jean-Louis
Re: Step losses in specific displacement
« Reply #3 on: July 31, 2007, 03:33:25 PM »
slow down that Max speed of the machine and see if that helps... it could be that the power supply is browning out
Fixing problems one post at a time ;)

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Re: Step losses in specific displacement
« Reply #4 on: July 31, 2007, 04:16:51 PM »
Hello Brian,

I actually didn't think about the power supply. Could you please explain what you mean by "power supply is browning out" ? (sorry, English is not my mother languageĀ   :P)

Thanks
Jean-Louis
Jean-Louis
Re: Step losses in specific displacement
« Reply #5 on: July 31, 2007, 04:25:19 PM »
Check the voltage of the power supply and see if the volts are dropping as it is moving... I think it may be the problem.

Thanks
Brian
Fixing problems one post at a time ;)

www.newfangledsolutions.com
www.machsupport.com
Re: Step losses in specific displacement
« Reply #6 on: July 31, 2007, 06:46:34 PM »
You're a very clever guy Brian. I think you pointed out the problem.
I made some test using a lamp to load the power supply at about 3 A. When I connect the lamp, the voltage drops down to 15 V for a while before recovering its rated value (27 V). And when I disconnect the lamp, the voltage then rises (I don't know how much, the power supply voltmeter stops at 30 V) and the overvoltage protection trips. I probably have a voltage regulator that is failing.

Thanks a lot for your help
Jean-Louis
Jean-Louis

Offline jimpinder

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Re: Step losses in specific displacement
« Reply #7 on: August 01, 2007, 01:49:30 PM »
The power unit for my stepper motors is a pair of batteries (leisure batteries). Mine are 120 amp hour, because I use them to power a miniature railway train. 75 amp hour ones would be adequate. The batteries can supply the current (amps) without the voltage dropping and mine can power all three stepper motors simultaneously without a problem. I have a 24 volt battery charger that charges them up. Maybe this approach is cheaper than a mains power system.
Not me driving the engine - I'm better looking.
Re: Step losses in specific displacement
« Reply #8 on: August 01, 2007, 07:05:13 PM »
Thanks Jim, it could be an interesting alternative. I don't know the cost for 2 batteries + 24 V charger compared to a new power supply but I'll have a look.

Jean-Louis
Jean-Louis
Fixing problems one post at a time ;)

www.newfangledsolutions.com
www.machsupport.com