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Author Topic: PWM and routers?  (Read 6175 times)

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Offline Jimmy B. Goode

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PWM and routers?
« on: August 04, 2010, 09:36:13 PM »
Hi,
Does PWM work for adjusting the speed of router motors? That would be awfully convenient, so obviously it probably won't. I thought about just trying it, but I'm worried about ruining the router. I'd appreciate any info.

Thanks,
Jimmy

Offline BR549

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Re: PWM and routers?
« Reply #1 on: August 04, 2010, 11:37:35 PM »
Yes IF you have a motor speed controller that can use PWM   OR  analog+/- with a control interface card.

Offline Tweakie.CNC

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Re: PWM and routers?
« Reply #2 on: August 05, 2010, 02:17:09 AM »
Jimmy,

PWM speed control works really well with 3 phase motors and their associated controllers but you run into problems with brushed motors overheating if they are slowed too much for too long (they all seem to have internal fans for cooling the windings). This doesn't mean to say that it can't be done though, just be aware of any temp rise in the motor.  ;)

Tweakie.
Success consists of going from failure to failure without loss of enthusiasm.  Winston Churchill.

Offline Jimmy B. Goode

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Re: PWM and routers?
« Reply #3 on: August 05, 2010, 06:44:00 AM »
Thanks for the info, I suspected something such might be the case.

Jimmy

Offline ger21

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Re: PWM and routers?
« Reply #4 on: August 05, 2010, 07:55:38 AM »
I think CNC4PC makes a PWM speed control that will work with a router motor.
Gerry

2010 Screenset
http://www.thecncwoodworker.com/2010.html

JointCAM Dovetail and Box Joint software
http://www.g-forcecnc.com/jointcam.html

Offline Jimmy B. Goode

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Re: PWM and routers?
« Reply #5 on: August 05, 2010, 09:44:28 AM »
Are you referring to their C-19 frequency converter? I've been curious about this product. Has anyone used this device, and if so how did it work?
Re: PWM and routers?
« Reply #6 on: August 05, 2010, 11:30:38 AM »
I have the C19 in my control box and love it.  It's a great little device and will easily run a PC 690 or even a bit bigger spindle.  It's worth every bit of the price!

Offline ger21

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Re: PWM and routers?
« Reply #7 on: August 05, 2010, 11:44:33 AM »
C19 or C29. Don't have any experience with either of them, though.
Gerry

2010 Screenset
http://www.thecncwoodworker.com/2010.html

JointCAM Dovetail and Box Joint software
http://www.g-forcecnc.com/jointcam.html
Re: Unwanted circles added to G Code
« Reply #8 on: August 20, 2010, 10:36:22 AM »
I have been using the free downlaoded Mach III on my CNC Router. If I load my own G Code many circles are shown on the toolpath unless I have run the Write wizard first. If I then load my own G code after this they run perfectly.

I have now purchased a licensed version and to me dismay the circles are still added to my G code.

Has anybody else seen this problem and has anyone an explanation or cure?

Offline Tweakie.CNC

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Re: PWM and routers?
« Reply #9 on: August 20, 2010, 10:46:13 AM »
If you toggle the IJ mode setting to Inc (config / general config) that should do it.

Tweakie.
Success consists of going from failure to failure without loss of enthusiasm.  Winston Churchill.