RE: [CAD_CAM_EDM_DRO] Servo/Stepper on a Surface Grinder

Hi Alan,

There's another example of where the ELS (Electronic Lead Screw) could
possibly be used although it's only a 2 axis controller. It's looking like
it will be the size of a desktop calculator. With one 3Amp 55V microstepper
driver on board which is good for a two-stack Size 23 motor and a second set
of X axis step/dir outputs it would do most of what you want. And if you
added a small flywheel to the main axis stepper drive you'd probably see it
absorbing any cogging.

In keeping with the ELS lathe the back and forth motion could be done by
what would normally be the Z axis of the lathe -- the part that moves the
carriage programmable multiple passes at one thread depth. Because it's
tied to a spindle sensor, it wouldn't move if the grinding wheel wasn't
turning.

Then the X axis would move the next increment (thread depth on the lathe or
amount to grind off on the grinder) and the Z would start all over again.
The X axis would lift the grinder up on each return pass unless the X
distance is set to 0.

So the only thing that it can't do directly is move the grinder over.
Alternatively with minor software changes, perhaps the X can move the table
under the grinder after each group of passes and you manually adjust the
grinding depth by hand.

You sound like you're willing to do some design work so once the ELS
hardware is finalized the source code will be available to modify it as you
like. Certainly wouldn't overwhelm the little grinder the way a full sized
PC might.

John Dammeyer

> Subject: [CAD_CAM_EDM_DRO] Servo/Stepper on a Surface Grinder
>
> The usage is this. Set the switches and press start. The
> table will move
> forward then back, at the speed specified by the TS switch,
> as many times as
> specified by the TTC switch.
>