Re: Fadal Drilling speed

Thanks Ken

Very helpful information!

Charles

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Ken Campbell"
<deltainc@...> wrote:

>
>
> ----- 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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