Kirk Wallace wrote:
On 08/09/2017 10:07 AM, Chris Albertson wrote:
One use I can think of for a low precision sensor is that you should be
able to home faster. The motor can run at full speed until it gets
close
then slow just before it hits a mechanical switch. For this use
case 10%
error is good enough.
My Shizuoka mill doesn't have home switches, but does have dials on
the ball screws. I put a pieces of tape on each axis slide which I use
to jog to get close to home. I then fine jog to zero the dial. I try
to jog from the same direction every time so that backlash is not an
issue. I can home within 0.0005" without much effort.
For an absolute position sensor, I'm thinking that a section of tape
from a tape measure glued to the slide would work well in conjunction
with a screw dial or pointer.
Hi Kirk,
You made me look. :) My wheels have no markings so taped a piece of
paper and made pencil mark. I mounted a .0001" dial indicator. I can't
see any backlash, just my wheel is sloppy. The wheel is 6 1/2" in
diameter and to get a .001" move, the outer rim moves ~.075". This is an
integrating solution to an accurate setup.
Thanks, Dan.
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