Re: Larken Cobra Stepper Drives

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Ron K <godsone@e...> wrote:

> snip
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> >Mine have been operating my bridgeport for nearly a year. No

problems.

> >I replaced gecko drives.
> >
> >
> >
> Why did you replace the Geckos ??

THEY DIED. Mounted on the 24"x36" door heat sink. The heavy slide
and the rapid decelleration of the 200lb plus slide built voltage,
the Mosfets had a avalanche problem/slow turnoff. The geckos depend
on the Anodized layer for insulation also. All were non-repairable.
Larken drives have conventional IC's in sockets, heavy heat sink.
The geckos are great drives for lighter applications. I have now saw
several with pentium heatsinks and fans on the backs that work just
fine.
Larkens are going strong, over a year now. Made a lot of parts.
David

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> --
> Ron Kline
>
> American Precision Ceramics
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> [Non-text portions of this message have been removed]