RE: [CAD_CAM_EDM_DRO] how the heck to peck

What are you making? Shower heads.

how about a standard Drill press with an X/Y table with Steppers/servos for
positioning.

for the spindle travel use a stepper/servo with a wire cable wrapped around
a drum in the quill feed and a drum on the stepper shaft. Of course you
would remove the return spring for the quill. You could use different drum
sizes to achive different resolution on the feed.

Cut a "Thread" on the drums for the cable to follow and use 2-3 wraps on the
smaller drum and
fix the ends of the cable (after a few wraps depending on the amount of
feed) on the larger drum.

This will give some control over feed speed and depth.

On the X/Y table mount a fixture to hold the parts.

control the whole thing with a G-Code interpeter and a set of geckos.

This is the medium price version.
If you want really cheap and the parts are small enough some floppy drive
parts can be used.

> -----Original Message-----
> From: dave_ace_me [mailto:davemucha@...]
> Sent: Wednesday, December 05, 2001 3:08 PM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: [CAD_CAM_EDM_DRO] how the heck to peck
>
>
> Hi Guys,
>
> I want to convert a drill press to a drilling machine and would like
> to get some experienced users comments.
>
> I'll be drilling holes in aluminum and have a few thousand 1/16 inch
> holes to drill.
>
> I was looking at modifying the standard drill press arbor with a
> stepper to allow it to peck.
>
> I was also looking at a linear actuator on the spindle to make the
> stroke.
>
> I've also seen a lot of other methods for controlling the downfeed.
> (solenoids, pneumatics, gear and pully drives) Since the tool
> pressure is not very heavy and the need for pecking is great (the
> chips put a burr on the edge of the hole) I would greatly appreciate
> any guidance to get this thing set up.
>
> TIA
>
> Dave
>
>
>
>
>
>
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