Re: dinky microstepping driver ? Linistepper

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "ballendo" <ballendo@y...>
wrote:

> Dave,
>
> Roman Black's Linistepper is microstepping unipolar, and comes set

up

> for 1 amp current limiting (about 25 bucks, but ya gotta solder it
> together and use a big heat sink) A guy named James in so. CA sells
> the kits, and provides support.
> It's a nice drive... 5,6,8 wire motors only.
>
> Hope this helps,
>
> Ballendo

Interesting unit.

http://www.piclist.com/techref/io/stepper/linistep/index.htm

seems it is a simple low amp unit that 'can' be used with higher
amps, but accuracy suffers due to thermal problems. but that is
clearly mentioned, and only happens when you try to over amp it.
google 'Linistepper' and 'free lunch' and you get no results !

Also, it does 3,600 microsteps, but again the data sheet clearly
says...

"(The stepper motor itself will not position accurately down to one
3600th of a turn, but there is still good useful positioning and many
other benefits gained from the increased smoothness.)"

For my purposes, that if fine, but it does not offer most CNC
applications an accurate step.

AND, this is WRONG to begin with. the unit offers FULL step, HALF
step, 1/6th Step and 1/18th Step. depending on your motor depends on
how many steps per revolution. NOT 3,600 microsteps, that would be
depending on the motor and refers to steps per revolution.

The data sheets list 35 volts as the max power supply, but since I'm
not trying to get high torque, this should be fine.

If anybody has used these and want to offer some advise on use,
please feel free.

Dave