Re: Odd disk-read problem

On Sun, 24 Jun 2007 07:21:18 GMT, Michael <gailey@xxxxxxxxxxxxxxx> wrote:

John wrote:

I just came from a customer that took a direct lightning strike at the
pole transformer. With the Ethernet connection in place two rs232 ports
went down and one on a pc.
You got to be nutz to tie all that stuff together with wires. Wireless
would be the only option for an ethernet connection.

John

The cnc was not grounded?
No surge suppressor either?
What about the UPS, no?

Do all cnc machines have wireless capability? Not very many yet.
Shop computers are usually older recycled pc's, most likely with out
wireless cards.

If you are running all the latest cnc's and pc's yes, wireless is a
great option.

We got around all of the ethernet, wireless, floppy etc methods.

I set up our cnc machines with a cd writer cabled into the control,
beside they are just basic laptop computers anymore that run Windows
anyway. Get a 2 drive cd cable a power plug and Windows sets up the
rest. It's an easy setup with no ethernet or wireless. We burn a cd and
take it to the cnc, we never drop a connection while running. Again, it
takes a new cnc to be able to do this. We bypass having a shop pc on the
floor. It works great for mold programs which sometimes get quite long.
CD's last 40 years, so they say, so we just archive discs for later on.


We still ground the cnc anyway.

Michael


Let's see ... lightning hits transformer, follows lines to machine ... what's
the best path TO ground for it?
Yep. Right THRU the machine's electronics to the machine's private little
ground.

We used to get a lot of nearby strikes in St. Petersburg. With all our
long communication lines & so forth a bit of an induced surge could be
be generated & monitors & suchlike were always blowing. Not even our
own two private substations helped much (if at all).
Surge suppressors & shielding ...
--
Cliff
.

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