2010/9/28 Tom Easterday <tom-...@bgp.nu> > 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 > > A tube doesn't twist without being distorted or made out of soft rubber (and therefore be distorted). There's no load on the tube in this case. There are many couplings that are made in the same, simple and clean design. Even for distributing momentum.
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