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Mach3 and Slider SFX problems
« on: May 31, 2009, 06:30:17 PM »
Hello, I've just built me a TRON-CNC and it seems that it is working, almost anyway! ;-)
Thought that I can use this for my model airplane hobby.

Problem is as follows:
When I run a CAM sequence generated by, in this case, cut2D, the sequence works OK for about halfway through the program.
Then suddenly the X&C axis start to sound terrible, scrambling and rumbling. It also seems that the torque is more or less gone. I can hold the motors with my hand.
The X-motor get slightly warmer than my hand and the C-motor stays cool.

When I switch off the Slider SFX for about 10-20 min. and then start up again the motors have their high pitch sound when running, and they are running just fine until next time I run a program.

I get the impression the the G-code G0 can have something to do with this.

Is there any of you, out there, who hopfully can help me or maybe give me a hint of what's wrong? This is getting into my bones soon! ;-)    

Best regards
Kent Strobel
Sweden
Computer: Windows XP Pro, Pentium 4, 3GHz
Hardware Mechapro Slider SFX+HP-Step (for4:th Axis). 1/4 Steps
Motor: Japan Servo KH56QM2-951
Software: Mach3 Version R3.042.020 full license
CAM Software: Vectric Cut2D
« Last Edit: May 31, 2009, 06:32:12 PM by strobel »

Offline Hood

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Re: Mach3 and Slider SFX problems
« Reply #1 on: June 03, 2009, 03:38:16 AM »
Sounds like it could be the driver getting hot, have you got it mounted to a heatsink? Try setting up a fan to blow cold air onto it to see if it helps.
Hood
Re: Mach3 and Slider SFX problems
« Reply #2 on: June 03, 2009, 05:43:36 AM »
Hello Hood,

Thanks for your quick reply. Appreciate that  :)

There is already a heatsink and a fan. Heatsink does not get warm, even after 30 min.

I tryed to disconnect one motor at the time running a program.
When only X motor was connected everything works great all the time.

Same procedure on C Motor. After just few minutes we have the problem again. Motor sound is terrible. there is no torque can hold it with my hand.
I turn the Slider SFX of for min. 8 min. and then it works again. Until next time.

Also changed from C-axis to A-axis in Mach3 but there is no difference
Also changed from 1/4 step to 1/8 step no change.

Best regards
Kent

Offline Hood

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Re: Mach3 and Slider SFX problems
« Reply #3 on: June 03, 2009, 05:51:10 AM »
Do you have a scope? if you do you could see if the port is putting out a good pulse when things are not working, that would let you know whether its the port or the driver that the problem is coming from.

 Hood
Re: Mach3 and Slider SFX problems
« Reply #4 on: June 03, 2009, 06:35:13 AM »
Hi again Hood!

Sorry, have no scope! Any oyher suggestion on how I maybe could find out whats wrong?

//Kent

Offline Hood

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Re: Mach3 and Slider SFX problems
« Reply #5 on: June 03, 2009, 06:45:01 AM »
If you can, swap pin asignment around in Mach for X and A and see if the problem follows the cofig.
Hood