Re: how the heck to peck

Hi again Dave,

On hearing more, sounds like you might want to do the stepper and a
timing belt or chain drive, and a PIC or Cybernetic Microsystems
programmable stepper controller.

http://www.controlchips.com/

The CY545B part (or even an old CY525) would do it. Then have the PC
command a "peck cycle". If you have access to the source code running
on the PC to drive the table, then you could also "ADD" code to run the
stepper up and down. Standard controller software running the table
could also drive a Z axis, or you could use a spare M07 code or whatever
to trigger a "peck cycle", as mentioned above.

Most any controller software already has a "peck cycle" (G81...89) that
should do the job. Just program the Gcode!

HTH

Alan KM6VV


dave_ace_me wrote:

>
> Hi Jan,
>
> I have already figured out how to do the X Y so that part is not too
> tough. There are a lot of ways to do the table movement.
>
> So I am going towards a full CNC machine.
>
> Since the tiny drills will be in aluminum or plastic (PVC)
> moving the parts is the easy part.
>
> In PVC, the drills bind if the material gets hot and there is heck to
> pay with a stuck drill. in aluminum, the chips mess with the lip of
> the hole. In aluminum the peck is to keep the entrance hole sharp,a
> nd in PVC it is to keep the bit cool enough to eleminate melting.
>
> Since I am using a PC to move the parts, I can control the motor
> actions.
>
> Seems like a chain will be the easiest to do now as I can get that
> pretty easily, and a smaller stepper would offer more torque when the
> gearing is used. I'm sure that chain wear will throw some curves
> down the road, but it may not be too bad of a problem.
>
> Since I'm doing through holes, there is no problem with depth.
>
> I'll be more than glad to hear any other suggestions or maybe some
> links to what has been done.
>
> Dave