Re: [CAD_CAM_EDM_DRO] Sargon encoder disassembly help

On 02/16/2011 11:40 AM, Bryan Mumford wrote:

> Thanks Jon. I can imagine doing this. I have found that, when
> unmounted, the encoder seems to work, but on the machine it tends to
> drop out in one place. I'm thinking it may be a matter of spacing,
> but I can't get the reader any tighter to the encoder because the
> mounting holes are snug. The read head is close to the encoder
> already. Does that make any sense?
>
> The failure is intermittent. It happened 6 months ago, then again two
> days ago. Right now it's working again. The plugs are secure.

Cables can be an issue. Often cracking conductors seem to give solid
connections until they are in EXACTLY in the wrong position and the
vibration is EXACTLY wrong. If the encoders are using incandescent
lamps, the dropouts can be due to reduced output or filament vibration
and sagging.

They work, but they have some really "interesting" failure modes. I
serviced them on precision photoplotters.

Dave 8{)