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Author Topic: Help Can't get steppers to move!!!  (Read 15588 times)

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Offline rcaffin

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Re: Help Can't get steppers to move!!!
« Reply #30 on: January 29, 2016, 12:26:37 AM »
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As well you loose torque when raising microsteps. Do most you guys agree with this?
Nope. But the bloggers often think so.

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if I can switch that easy.
A word of caution. DO NOT EVER switch units during a program!!!!! Sadness wil follow almost invariably.

DC servos with optical encoders, not steppers. Single step resolution of 0.8 microns.

Cheers
Roger

Offline RICH

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Re: Help Can't get steppers to move!!!
« Reply #31 on: January 29, 2016, 12:44:23 AM »
I suggest you go to the Gecko Site and read a  lot of the info they have about steppers, etc.
Doing that will answer a lot of questions or misconceptions you may have.
No use repeating the same info here.

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Just for poops and laughs..............

Use 10us on my drives
Steps per unit are over 253000 for my engraving machine................ theoretical resolution better than 0.0000004".
Max  velocity 5 IPM.
You asked ..............  ;)

RICH

Re: Help Can't get steppers to move!!!
« Reply #32 on: January 29, 2016, 01:49:44 AM »
hahahaha Nice Rich....

Well I was thinking about in the very near future to throw encoders on. I found some Omron 2000ppr three phase encoders for $25 a pop on eBay. would it be worth it?

Way different subject here, Do any of you use touch probes? Any of you made your own? I've been looking a lot  into designs a thought of making one. I have a nifty trick/design I'm gonna try in the next few days. Have you seen anyone use a Piezo Transducer, and have it flex when probe moves? wonder if I can get that to work, I'll post the build up if it'll work as planned.
« Last Edit: January 29, 2016, 02:01:55 AM by nissan20det »
Re: Help Can't get steppers to move!!!
« Reply #33 on: January 29, 2016, 03:11:44 PM »
never mind... :( I thought I had a million dollar Idea lol. some people have done it.

Well what do you guys think.

1. Piezo with a lot of amplification (Simple) have all parts..

2. Accelerometer/inclinometer 256LSB/g = 256mv/g -l do have parts but digital means ill have to use a Arduino to convert a Bit amount to a switched 5v.

3. actual inclinometer 16V/g - 280mv/degree hella sensitive!!!

Offline rcaffin

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Re: Help Can't get steppers to move!!!
« Reply #34 on: January 29, 2016, 03:24:32 PM »
All of those require actual deflection of the sensing tip, either to get piezo voltage output or to tilt the inclinometer.
What the world really needs is a touch probe which does not need any deflection - which senses touch.

Cheers
Roger
Re: Help Can't get steppers to move!!!
« Reply #35 on: January 29, 2016, 05:36:18 PM »
ya well thats not hard to do there all like that anyway. And why dont they do it with electrical contact. So Say probe with a wire down to the tip, Tip being a copper ball and having 5v just being contacted through your work peice? of course your stock would have to be conductive. don't some touch plates act like that?

Offline rcaffin

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Re: Help Can't get steppers to move!!!
« Reply #36 on: January 29, 2016, 05:52:56 PM »
Conductive touch probes? That idea has been in use for ... I dunno, maybe 50 years or more. I really haven't a clue when it was first invented. Does not work on insulators of course.

Conductive touch plates for the  axis? Yeah, just as ancient.

It might be amusing to do a patent search on the idea, to see how many times it has been patented. Probably would not put the PO in a good light, but I have not bothered.

cheers
Roger

Offline Davek0974

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Re: Help Can't get steppers to move!!!
« Reply #37 on: January 30, 2016, 04:52:51 AM »
never mind... :( I thought I had a million dollar Idea lol. some people have done it.

Well what do you guys think.

1. Piezo with a lot of amplification (Simple) have all parts..

2. Accelerometer/inclinometer 256LSB/g = 256mv/g -l do have parts but digital means ill have to use a Arduino to convert a Bit amount to a switched 5v.

3. actual inclinometer 16V/g - 280mv/degree hella sensitive!!!

Why not just use a simple microswitch - I fitted a probe to my plasma machine and the accuracy is about 0.1mm repeatable. The downforce to trip the switch is a mere 3gm.
Bridgeport Mill, Mach3 V062, CSMIO-IP/A controller, AC Servo Drives.
Plasma table, Mach3 V062, Step motors, C&CNC THC.

Offline rcaffin

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Re: Help Can't get steppers to move!!!
« Reply #38 on: January 30, 2016, 05:35:25 AM »
Hi Dave

A microswitch might work fine if 0.1 mm is sufficient accuracy.
But you need something a shade better if you are looking for 0.01 mm or 10 um. For me, that would be the worst case.
Going below that (to under 5 um) gets even more $$$. I would be looking for this.

Cheers
Roger

Offline Davek0974

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Re: Help Can't get steppers to move!!!
« Reply #39 on: January 30, 2016, 06:06:51 AM »
Ah, I see, thats the trouble with only using plasma - its not that accurate and does not need to be.

:)
Bridgeport Mill, Mach3 V062, CSMIO-IP/A controller, AC Servo Drives.
Plasma table, Mach3 V062, Step motors, C&CNC THC.