Re: [CAD_CAM_EDM_DRO] servo runaway prevention

> Encoder cables falling off is a really bad thing.

I guess you are right that a following error would only be generated
if the machine were commanding a move at the time the encoder failed.

It strikes me that some sort of backup 'sanity check' in the amp
itself would be good. This might take the form of a second low-res
encoder. If pulses are seen when command velocity is zero, error out
and shut down. And amp with a tach might have something to check
consistency between the two - if one signals motion and the other does
not, something bad is happening.

I will definitely think twice now before I go squeezeing between the
servoed bridgeport table and the workbench it almost hits at extreme
travel...

Chris