Re: [CAD_CAM_EDM_DRO] Re: Bridgeport retrofit servo questions

braidmeister wrote:

>Luke,
>This encoder from US Digital looks like it will do the job: E6S-2000-
>625-PKG1
>
>Here's the breakdown of the part#:
>E6S - series number
>2000 - CPR
>625 - 5/8" shaft
>PKG1 - includes hex key and spacer tool
>
>I like this one over the E3 because it has a nice snap-in connector
>on it. Yes, you're paying a little more for it, but I think that
>since they sell the shielded cable ready to go, it makes life a lot
>easier and makes for a cleaner/reliable installation.
>
>The price breakdown is this:
>Base price for E6S = $49.
>
>
>>= 2000 CPR add $8.82 (because it is HiRes)
>>
>>

You can probably save yourself the $8.82 here, and use 1000CPR encoders
instead. Remember that the Geckos (or Rutexes) will use quadrature, so
you would get 8000 PPR (pulses/phases per revolution, vs CPR = cycles
per revolution).

1000CPR encoders would give you 4000 * 5TPI ballscrews = 20k steps /
inch, which should be plenty. If you end up doing belt reduction, the
resolution will be even higher.

- Steve