On Sep 28, 2010, at 3:24 AM, Anders Wallin wrote:
> Here's our simple solution for the spindle encoder:
> http://www.anderswallin.net/wp-content/uploads/2008/06/encoder.jpg
> 
> It's a US-digital encoder which is mounted to a U-shaped bracket which
> is bolted to the fan-grill on the back of the AC-induction spindle
> motor. There was a thread on the end of the motor axis, so we extended
> the axis with a piece of threaded rod. The axis coupler is a piece of
> plastic tubing.

Wouldn't having a plastic tube as coupling cause a problem?  Seems like the 
tube would have some give and therefore you would have false position 
information from the encoder....
-Tom


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