Mystery hardware

Lynge
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12 Jan 2012 21:30 #16687 by Lynge

Replied by Lynge on topic Re:Mystery hardware

Do you mean it jitters when connected one way and does nothing the other way?

Yep. Can't remember if it made a sound, but only jitter with the pinout from the docs. Everything else is squeeking sounds or nothing at all.

But it sounds like you are making progress.

Indeed. This is much better than yesterday. At least I have the feeling this is just a wrong setting somewhere and I just have to hunt it down. Yesterday I wasn't sure if needed to go out and buy a whole new motorkit.
Thanks for all the help so far by the way.

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Lynge
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12 Jan 2012 21:31 #16688 by Lynge

Replied by Lynge on topic Re:Mystery hardware

I think I will try reversing a phase on one of the motors. Just to see if that does anything.

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andypugh
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12 Jan 2012 21:36 #16689 by andypugh

Replied by andypugh on topic Re:Mystery hardware

Lynge wrote:

I think I will try reversing a phase on one of the motors. Just to see if that does anything.

It should just reverse the motor.

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Lynge
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12 Jan 2012 21:39 #16690 by Lynge

Replied by Lynge on topic Re:Mystery hardware

You may also want to go back and adjust your step and direction times, make them MUCH longer and look for change.

I have just tried raising them from 5000-5000-100000-100000 to 15000-15000-500000-500000 and it had no effect at all. At least none I could feel or hear.

It should just reverse the motor.

But what if one phase is wired CW and the other is wired CCW. Would that not produce this? First one direction from one of the phases and then the other direction when it gets to the other? Or have I completely misunderstood how these look inside?

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Lynge
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12 Jan 2012 21:45 #16691 by Lynge

Replied by Lynge on topic Re:Mystery hardware

Well, it did absolutely nothing. Apart from the motor being weaker in one direction. So they appear to wired correctly.

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andypugh
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12 Jan 2012 21:53 #16692 by andypugh

Replied by andypugh on topic Re:Mystery hardware

Lynge wrote:

But what if one phase is wired CW and the other is wired CCW. Would that not produce this?

No, because the stepper is driven with a 4-phase pattern, ABab (if you consider A to be positive A and a to be negative A)

If you swap the A for a you get aBAb. Rearrange so b is first: baBA, and you see it is the same pattern, but backwards.

AaBb would be a dithering pattern, but the drive will never produce that.

For interest, half-stepping is A-AB-B-Ba-a-ab-b-bA.

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Lynge
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12 Jan 2012 22:40 #16693 by Lynge

Replied by Lynge on topic Re:Mystery hardware

andypugh: ah ok, I think I get it.

But now I am stuck. Anyone have any other ideas to try?
I have tried tracing the pins again, but I simply cannot get it to work. Also, the pins seem to be right as nothing else seems to make it move.

So, anything you can think of.

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BigJohnT
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12 Jan 2012 23:25 #16695 by BigJohnT

Replied by BigJohnT on topic Re:Mystery hardware

Do you have a clear photo of the board?

John

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Lynge
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12 Jan 2012 23:42 #16698 by Lynge

Replied by Lynge on topic Re:Mystery hardware

Absolutely.
Here you go
dl.dropbox.com/u/23003345/20120113-DSC_1896.jpg
and
dl.dropbox.com/u/23003345/20120113-DSC_1894.jpg

If you need one without the heatsink on, just let me know. It just takes a little to upload them on this crappy line.

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BigJohnT
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13 Jan 2012 00:25 #16700 by BigJohnT

Replied by BigJohnT on topic Re:Mystery hardware

Just reading the pdf you linked early on as my lathe makes a part I see the DB25 pinout for X axis is:

Pin 4 X enable
Pin 1 X direction
Pin 16 X step

Did you configure the X axis this way when you tested?

Andy just mentioned that his crappy board had some limits that needed to be jumped out to work. The DB9 has the X axis limits on pin 1 and 10...

And there is the chance that the board never worked from the git go... any chance on dumping that and getting a Gecko G540 or some G251's and just moving forward with your CNC endeavors?

John

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