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Date: Thu, 18 Dec 2014 20:57:44 +0000 (UTC)
From: Cirilo Bernardo <cirilo_bernardo AT yahoo DOT com>
To: "geda-user AT delorie DOT com" <geda-user AT delorie DOT com>
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Subject: Re: [geda-user] Nema 23 stepper motors
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Why not use one of TI's DRV8xxx or other specialized driver chips?
You can see the TI gizmos here:

http://www.ti.com/lsds/ti/apps/motor/products/integrated_motor_drivers.page

It's been well over a decade since I've used microcontrollers to do
anything more than the setup and clocking of the motor driver IC.

- Cirilo


>________________________________
> From: Rob Butts <r DOT butts2 AT gmail DOT com>
>To: geda-user AT delorie DOT com 
>Sent: Friday, December 19, 2014 3:12 AM
>Subject: Re: [geda-user] Nema 23 stepper motors
> 
>
>
>It's been a while since I've worked on this project.  I know I had documentation on how to do micro-stepping with the microchip proc but now I can't find it.
>
>
>
>
>
>
>On Thu, Dec 18, 2014 at 7:09 AM, Balogh Richard, Ing. <balogh AT elf DOT stuba DOT sk> wrote:
>Try to find resonant frequency of the whole system and then
>>operate the stepper as far as possible from it. Notice that
>>usually there is more than one such frequency. You can find
>>it easily with simly increasing the frequency of the steps,
>>i.e. accelerate the motor constantly.
>>
>>Richard
>>
>>
>>Dňa 17.12.2014 18:21 Rob Butts  wrote / napísal(a):
>>
>>
>>I'm using this motor to turn a shaft.  I have all of the inputs in a static state with the clock signal turning the motor.
>>>
>>>With the motor not connected it is silent as it turns.  When I mount it on a metal block so that it meshes with the gear of the shaft it puts out a rattle as it turns,.
>>>
>>>I found that if you press down on the stepper it doesn't chatter so much.  We put a neoprene gasket under it which helped quiet it but it was still a noticeable chatter.
>>>
>>>We then mounted a plate on top with a neoprene gasket lightly compressing the stepper.  This quieted it quite a bit.
>>>
>>>Is this a common issue with steppers or am I not doing something correctly?  Lastly, does anyone see a problem slightly compressing it?
>>>
>>>Thanks
>>>
>>
>>
>
>