Re: [CAD_CAM_EDM_DRO] DEEP POCKET MILLING

I would make 4 holes in the corners with a drill of the same size as twice the radius required
then I would make a series of chain drilling about 1/8 diameter and drill both sides
(top and bottom) with a distance between the centers of the holes about .005 longer than
the diameter of the drill. When all the holes are drilled then the middle chunk could be
knocked out and the job milled out .
regards
mariano


Jon Elson wrote:

> "Victor Cantu Jr." wrote:
>
> > JON,
> > THE MATERIAL IS 12 LONG X 6 WIDE X 6.25 THICK. THE POCKET IS 10 LONG X 4 WIDE AND THRU LEAVING A 2.000" BORDER AROUND. I WILL BE USING A FADAL VERTICAL MILL. MY PLAN WAS TO USE A 3/4 MINICUTTER ABOUT 3000 RPM AND ABOUT -.600 PER PECK AND A FEED OF 20.IPM. DO YOU THINK THIS IS TO MUCH? THE POCKET HAS A .25 RADIUS IN THE CORNERS AND I WANT TO AVOID CHATTER WHAT DO YOU SUGGEST. YOUR INPUT IS GREATLY APPRECIATED.
> > VIC
>
> Well, I now understand the hole is through the 6.25" dimension. That is still
> a serious problem, but I think you can probably get away with it. I'm guessing
> this is a CAT-40 type spindle, or better. There are certainly indexable end
> mills that are all one piece, except for the insert, that come in a variety of
> lengths and extension 'shanks'. I think that would be your best bet for this,
> as they offer more rigidity at that kind of extension than an extended shank
> consumable end mill in a collet or extension holder.
>
> Wait a minute - how will you get a .25" radius with a 3/4" cutter? Or, is this
> the radius where the bottom meets the side? A properly radiused tool will
> do that.
>
> Jon
>
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