W.E.T.Re: [CAD_CAM_EDM_DRO] backlash

Hi Ballendo:
YOU GOT THAT RIGHT: You only have to snap one cutter and you
will learn REAL QUICK. Wonder how I know??? I have worked on some
old well worn machines that you had to put the table locks on to a
medium force, so there was a lot of drag, to be able to take a light
finish cut in the climb cutting direction.
GOD'S BLESSINGS
Bill

>In CCED, "Dennis Schmitz" <denschmitz@...> wrote:
>So if the controller knows the thrust reversal is coming, it can

ramp

>the speed down (even a very steep ramp should work), proceed across
>the dead zone at a pre-determined safe speed, and hit the other side
>gently, watching the current draw to know when it was there.

Uhhh, No.

There is no "pre-determined SAFE speed"

You're forgetting that the cutter is ENGAGED with the material. Very
often the forces involved are enough to SLAM! the work from one side
of
the "dead zone" to the other!

Tools break, metal flies, folks get hurt.

Part of the reason the FIRST things a manual machinist is taught is
NOT
to climb cut on machines with ANY backlash...

Ballendo