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New cnc machine running but....
« on: November 09, 2016, 06:18:25 AM »
HEY!  Having a problem tuning my new diy woodworking cnc. I am making a clock just to test out the machine i have made the clock my previous machine so i know what it should look like.

When the machine goes around the outside of the clock to cut it out and make other circular shapes the x motors do a large clunk when the drop down to 0 rpm and then turn the other direction.

I am using:

Mach 3
chinese tb6560
nema 23 steppers
board set at 1/8 chip setting
sorry i am still learning all of the cnc stuff

Here i have a link to describe the problem also my mach settings are at the end of the video.

https://www.youtube.com/watch?v=0OyRO91hfTk

Thanks for any help/advice!

wes

Offline Davek0974

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Re: New cnc machine running but....
« Reply #1 on: November 09, 2016, 07:35:50 AM »
Not surfier its the problem or just a symptom but it sounds like the acceleration is set really really low - it takes a very long time to slow and speed up.

Could be resonance in the motor maybe?

Sure someone will be along to help out.
Bridgeport Mill, Mach3 V062, CSMIO-IP/A controller, AC Servo Drives
Re: New cnc machine running but....
« Reply #2 on: November 10, 2016, 10:25:18 AM »
I agree with Dave, I think you could go on to YouTube and look at how to setup Mach3

Here is a place to start, you should "do" all of them, about 4 I think

regards Ford
Re: New cnc machine running but....
« Reply #3 on: November 11, 2016, 06:31:07 AM »
I have watched the setup videos to no avail. i have spent hours trying to get the motors to work as smoothly as possible do you think the voltage could be a problem? i am running 4 motors off of only 12v ... the board i have says its good for 12-36, i have no other ideas,,, this is not my first build so i have been through the process before and have had a very smooth running cnc the only diffrence in my new one is its bigger and is 4 axis running 4 motors instead of my old 3 axis running 3.

Thanks for that advice i will continue to investigate

Offline Davek0974

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Re: New cnc machine running but....
« Reply #4 on: November 11, 2016, 06:32:38 AM »
I would certainly look at stepping up to 24v, 12 is way too low i think.
Bridgeport Mill, Mach3 V062, CSMIO-IP/A controller, AC Servo Drives
Re: New cnc machine running but....
« Reply #5 on: November 11, 2016, 06:37:52 AM »
will stepping up to 24 v change any characteristic of the motors ? such as speed? temperature? steps per inch ?

Offline Davek0974

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Re: New cnc machine running but....
« Reply #6 on: November 11, 2016, 06:58:44 AM »
It should increase the capacity to change speed better, they can reach speed faster if settings allow it, they will get a little warmer only if current is changed as well - this needs to be set at motor limit not over, steps per will NOT change - this is a hardware setting.
Bridgeport Mill, Mach3 V062, CSMIO-IP/A controller, AC Servo Drives
Re: New cnc machine running but....
« Reply #7 on: November 11, 2016, 08:19:51 AM »
I used a 40 volt transformer and cranked it down to 36, the more volts you use the more watts and the more watts will give more HP.

I also asked the supplied of my card which microstep settings to use so I used that setting.
I think they are all different on different cards so please check that as you say "board set at 1/8 chip setting" sounds to me worth checking as I dont know what that means.

regards Ford

Offline Davek0974

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Re: New cnc machine running but....
« Reply #8 on: November 11, 2016, 08:24:13 AM »
Word of caution on using the 36v supply on a 36v driver - it will have no or little headroom for over voltage caused by back emf when slowing down.
:)
Bridgeport Mill, Mach3 V062, CSMIO-IP/A controller, AC Servo Drives

Offline Tweakie.CNC

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Re: New cnc machine running but....
« Reply #9 on: November 11, 2016, 08:32:17 AM »
How did you 'crank down' a 40 volt transformer to 36 volts ??

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