RE: [CAD_CAM_EDM_DRO] Dead encoder???

It's worth noting, expensive encoders have glass wheels inside, cheaper ones
like the HEDs HP range have a pierced metal disk.

In other machinery we have found the metal disks when new are pretty good,
but when a year or so old will resonate at some frequencies and the metal
touches the sides of the light gate. Eventually something gives and the
metal disk will end up with holes, but before that things are most erratic
at these resonant points. We aren't sure what causes them to go from stable
to resonant, we think it's other machine vibrations in our particular
problem they were on a torsoinal overhead gantry that can bounce around a
little increasing the probability of failure. Presently if the operators get
strange responses that could be encoder related we change the HEDS encoder
and it cures the fault, and is much cheaper than overseas engineer time.



Regs Mark





_____

From: CAD_CAM_EDM_DRO@yahoogroups.com
[mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of Marcus
Sent: 14 October 2006 16:52
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: Re: [CAD_CAM_EDM_DRO] Dead encoder???



Hi Jon and Harko:
I begin to understand...thanks for the information.
I did some more testing yesterday, and found that the problem moves around
pretty randomly.
I'm doing some more testing today to try and pin it down better.
Cheers

Marcus





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