THose add-on boards look good for small motors. I just downloaded the user
manual.
But for a machine tool, even a mini-size one you might want more power.
Stepper-online has that for about $125 per axis.
About adding an index, why swap ou the encoder? just add a magnetic or
optical pickup someplace.
A larger closed loop motor is going on my mill's vertical axis bacuse it
needs to hold a static load. The closed system uses much less power for
static loads than do open loop systems.
Those add on boards might work on small robot arm I want to build.
On Fri, May 17, 2019 at 1:44 PM Greg Bentzinger via Emc-users <
emc-users@lists.sourceforge.net> wrote:
> {Greg}
>
> There are options to converting existing steppers to closed loop feed back.
>
> The LCNC software/hardware option would be to add an encoder and run the
> stepper in velocity mode. This does not offer the many advantages of the
> direct feedback drivers.
>
> Then for small steppers there is the Mechaduino bolt on option. Buy direct
> from
>
> https://tropical-labs.com/
>
>
> https://hackaday.com/2016/06/01/mechaduino-closed-loop-stepper-servos-for-everyone/
>
> https://github.com/jcchurch13/Mechaduino-Hardware
>
> https://github.com/jcchurch13/Mechaduino-Firmware
>
> The latest firmware release was 26 November 2018 so this is not a dead
> item.
>
> If someone were to build on this open source project and produce a unit
> with a 50VDC / 6A working power capacity it could cover most steppers.
>
> IIRC Gecko drive was once working on this idea and had it working, I think
> maybe it was not released because it was not economical and would not match
> performance of matched motor drive combos, but that is just my speculation.
>
> I would like to get one of the matched motor/driver units and see if the
> encoder could be replaced with a unit which included a index channel.
>
> {/Greg}
>
>
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> Emc-users@lists.sourceforge.net
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>
--
Chris Albertson
Redondo Beach, California
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