Re: [CAD_CAM_EDM_DRO] Re: um, is the (Chinese scale) dro acting wierd?

fignoggle wrote:

>ok, it happened today again (a few times). someone had mentioned about
>taking a look at the scale readout as well. and sure enough, they've both
>skipped. guess this _IS_ the scale.
>
>another thing. i actually saw the y axis readout skip the .200" inch when
>i turned the speed knob on. it happened once this way. (btw, it also
>jumped by .100" too at some time)
>
>then, i noticed that the z axis also did the same!
>
>and the x axis too. unless i read the cad drawing wrong, when i went to
>counterbore, i noticed that is wasn't centered (it was off by less than
>.100" but still problematic.). i had to go back and reset the x to do this
>and redrill the hole (now it's oblong)
>
>so, what do i do? how do i shield the cable? and is this each cable from
>each other? i assume that the scales are grounded since they are mounted
>to the base.
>
>

If the display on the scale changes, then no amount of cable shielding
will help, because the problem is internal to the scale.

You might try changing the battery in the scale(s). I have a caliper
that's basically the same as these Chinese scales, and I was getting
wacky readings for a while (like 57 inches - it's an 8 inch caliper).
Changed the battery, and all was well (a button had been held down, so
the battery drained faster than normal).

- Steve