Messages

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General Mach Discussion / Re: Steppers Stop When Driven Below .8 IPM?

« on: November 18, 2014, 02:28:02 PM »

Yes sir, thank you very much for your info. I will have to keep an eye on things, maybe do a stress test where all 4 motors are zinging around and do my tuning around that. Thanks again!

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General Mach Discussion / Re: Steppers Stop When Driven Below .8 IPM?

« on: November 18, 2014, 03:22:56 AM »

The step pulse suggestion worked perfectly,  Changed it from 2uS to 3uS, and bam, problem fixed. Steppers run all the way down to .01 IPM now. Thank you guys for the help so much, machine is so much better now.

 How is an underpowered power supply finally going to bite me? What symptoms should I be on the look out for? I haven't noticed any problems. I choose the 7.3 amp supply based on being cheap and planning for only 3 axis, but now I'm running the three 3.5 amp steppers plus the fourth 2.5 amp stepper for hours straight on that power supply. Given that when all four axis are being used, it's for 3d printing, so the Z axis only see's a small blip every now and then, I hoped it would OK.

3

General Mach Discussion / Re: Steppers Stop When Driven Below .8 IPM?

« on: November 15, 2014, 06:38:14 PM »

Ya I read somewhere that you don't need resistors for 3.5 amp steppers on the G540, because it's max is 3.5 amps. But they also said it will not go into standbye that way as well. But I'm going to see if I can find something else on it.

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General Mach Discussion / Re: Steppers Stop When Driven Below .8 IPM?

« on: November 14, 2014, 02:28:55 PM »

My steppers are all built for 3.5 amps, and I am using the current resistors at 3.48 K ohm. You have to remove the resistor to get out of standbye mode correct?

And I will check my steps pulse width settings, and see what I can do.

It does seem nobody else has this problem lol.

And on the power supply note, I do have a 4th stepper I use for 3d printing it's like 2 or 2.5 amp,  sometimes that is used.

5

General Mach Discussion / Steppers Stop When Driven Below .8 IPM?

« on: November 14, 2014, 03:50:43 AM »

Alright, having a pretty annoying problem, and it seems I'm the only one to have this problem. 
Got my CNC running great for the most part, but the if ran too slowly, around .8 IPM or less, steppers go into standbye, as if getting no commands. Basically on slight diagonal angles and slow curves, the slower axis will stop and lose steps. I'm running the gecko g540 on a 48v 7.3 amp PSU, pushing three 3.5 amp steppers, at 20,000 steps per inch.
I just wish Mach3 had a minimum speed setting.
Anyone have any suggestions?