Re: [CAD_CAM_EDM_DRO] Re: G201 death/repair/questions/problems (long post)

<snip>

>P.S. About these drives:

<snip>

>Main point: No drives were ever sold with the soft plates; I would
>never sell anything I knew was junk or flawed in any way. I have a
>large box filled with 1,000 plates to remind me we did the right
>thing.

I'm sorry, I didn't mean to imply that you did sell junk; I don't write as
well as you and don't always get my point across. I just wanted to point
out a possible failure mode, and something to check. I seem to remember
that the drive in question has had a fet replaced before, and in the
process, the plate may have been scratched. Without a doubt, if there were
continuity between the base plate and the fet, this would be a bad thing.
I've killed fets before by accidently shorting the mounting tab of the fet
to ground. Just trying to share a lesson I learned the hard way... (and
not with Geckos. I've never had a problem with any of my Geckos. I'll buy
more when the need arises).

- Steven Ciciora

>
>
>--- In CAD_CAM_EDM_DRO@yahoogroups.com, Steven Ciciora
><sciciora@A...> wrote:
>> I thought someone told me that the Geckos that were sold without
>lids
>> initially had the heat sink/base plate 'soft' anodized, not 'hard'
>> anodized. Small scratches in the heat sink/base plate would cause
>the case
>> of the FETS to conduct/short out to the base plate. This is a bad
>thing.
>
>