Re: [CAD_CAM_EDM_DRO] Fadal Drilling speed

----- Original Message -----
From: "smeboss" <c65pratt@...>
> I'm wondering how fast a Fadal 4020 can drill a series of 15/16 holes
> thru 3/8 mild steel, rectangular patttern, 2 rows of 4, 4" centers?

> Charles
******
One advantage of controlled feed ( cnc or leade screw control ) is that you
don[t slow down and work harden the steel being cut .. with hss drill, 2
flute, try 0.001 per flute per turn, so a 1/2 inch plunge would take about
1/4 minute at 1000 rpm.
This is per hole, so have to add up your fast approach rates, and if you a
lot of these you could go to carbide tooling and about double that rate.

If high accuracy in locating the holes is important, even with a sturdy
mill, you might want to do a center/starter drill "peck" on each hole first
.. this would be almost as fast as rapid traverse to each hole while
pecking, the peck diamter only has to be a teensy wider than the flat on the
larger following drill point, ie the following larger drill is located by
the angled cutter tips, not the center flat.

Hope this helps. note the brand of the drilling machine does not matter (g).
ken campbell, deltawerkes





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