Re: [CAD_CAM_EDM_DRO] Chopper max voltage?

I'd never thought about that... Makes sense that it could be a problem
though. I can't be bothered taking the lid off the box to look, but I
suspect the way they are mounted, the copper leads on the 298 would be OK
taking up any movement...

Food for thought though. Probably better to use a soft mounting of some
sort for the heatsink...

Cheers, Chris.

* Design engineer, Assembly worker, Cleaner.
* Ohmark Electronics. PO Box 5302, Christchurch, New Zealand.
* http://www.ohmark.co.nz

----- Original Message -----
From: Kevin P. Martin <kpmartin@...>
To: <CAD_CAM_EDM_DRO@egroups.com>
Sent: Friday, October 06, 2000 8:46 AM
Subject: RE: [CAD_CAM_EDM_DRO] Chopper max voltage?


> -----Original Message-----
> >From: Chris Hellyar [mailto:chris@...]
> >... Also the heatsink is
> >mechanically mounted to the PCB with alloys spacers to reduce mechanical
> >stress on the driver legs etc.
> Although this may reduce the stress caused by vibration (i.e. it steadies
that
> huge resonant springy mass hanging off those poor little terminals), it
can also
> *cause* stress as the heat sink and the device's leads undergo
differential
> thermal expansion. I suspect that the latter stresses, which would
typically be
> relieved through flexing of the PCB, easily exceed the stresses caused by
> vibration and the weight of the heat sink.
> -Kevin Martin
>
>
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