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Author Topic: Hybrid stepper motors from e bay  (Read 5451 times)

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Offline Davek0974

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Re: Hybrid stepper motors from e bay
« Reply #20 on: November 03, 2016, 09:08:15 AM »
If its only losing when pushing it , that sounds pretty normal to me, there is only so much the motors can do.

As you say, its a new issue so i would not be looking at wiring. ;)


By the way, the picture below is of a so-called commercial plasma table controller, a perfect illustration of how NOT to wire up :)
« Last Edit: November 03, 2016, 09:18:07 AM by Davek0974 »
Bridgeport Mill, Mach3 V062, CSMIO-IP/A controller, AC Servo Drives
Re: Hybrid stepper motors from e bay
« Reply #21 on: November 03, 2016, 12:07:55 PM »
Woah that is crazy they get away with selling that. I'll take a pic of my box when I get back this evening. Not nearly as messy
Re: Hybrid stepper motors from e bay
« Reply #22 on: November 03, 2016, 06:38:19 PM »
This is the first test I did of a wood joint I made in aspire for cabinet door frames. Im losing steps in the pocketing successively and that would be from my y axis motors. Im kind of in belief that my gantry is too heavy for that kind of speed and accel but if this is the case im better off with a chisel.
Re: Hybrid stepper motors from e bay
« Reply #23 on: November 03, 2016, 06:42:05 PM »
Test 2. These cuts are at 18000 rpm 6mm carbide 2flute 70 ipm and .06 on cherry wood. Seems sluggish to not be able to run a tool at the appropriate speed.
Re: Hybrid stepper motors from e bay
« Reply #24 on: November 03, 2016, 07:00:39 PM »
This is test 2 the last one is hhow the parts should be, I would not place that tab on the dovetail like it is here in my test. The last one is showing how its losing in the x axis for starting the cut in the wrong spot and hacking both the parts too short. Same as the first chopping out the smooth part of the tail board. I can attach a dxf of my wood joint for anyone that wants to try. Dxf file and you just position your two 3" wide boards at a 90in your cam program and align a vertical guidline to the edge of the boards. Then useing layers separate the two sets of lines and the rest is quick trim tool and maybe some extend to common point. Just ask and i will get it posted up. i used a .3 radius for curves for a .25 or my case cheapo 6mm em Thanks a bunch Dave

Offline Davek0974

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Re: Hybrid stepper motors from e bay
« Reply #25 on: November 04, 2016, 03:11:16 AM »
What is your acceleration set for in motor tuning?

May be worth trying the 1/10 rule - say speed is set for 5000mm/min then acceleration would be set for 500mm/s/s - its not a hard and fast rule, just something i have works great as a starting point.

How big is the machine? For some odd reason i was thinking small but it looks big :)

I see motors are Nema23 but what size 3Nm, 4Nm ??
Current settings in the driver?
Is it rack & pinion ?
Bridgeport Mill, Mach3 V062, CSMIO-IP/A controller, AC Servo Drives
Re: Hybrid stepper motors from e bay
« Reply #26 on: November 04, 2016, 07:25:53 AM »
The machine has a cutting area about 37"x19" . Its kind of a beast as far as weight of the gantry. I have my motors at 1600  steps per, 5mm pitch ballscrews on all axis. Driver is set to full current. They are 425oz/in bipolar steppers.

Offline Davek0974

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Re: Hybrid stepper motors from e bay
« Reply #27 on: November 04, 2016, 07:37:15 AM »
Ok, thats a 3Nm motor then, should be ok on screws, is that direct drive or belt drive with reduction ratio?

Any chance of a picture?

Is it skipping on the axis with slaved motors or the one with a single motor?
Bridgeport Mill, Mach3 V062, CSMIO-IP/A controller, AC Servo Drives
Re: Hybrid stepper motors from e bay
« Reply #28 on: November 04, 2016, 07:44:44 AM »
Can you see with the pics whats goin on? The screenshot in aspore is how it should look. I had it set at 1800mm min and 150 accel. I had tried accel at 250 but it lost its smoothness if you know what I mean. I was lost with these settings without some kind of data spec sheet. Thank a bunch for all the helpfull input.
Re: Hybrid stepper motors from e bay
« Reply #29 on: November 04, 2016, 07:56:55 AM »
Here she is, messy but.......