Re: DEEP POCKET MILLING

--- In CAD_CAM_EDM_DRO@e..., Jon Elson <jmelson@a...> wrote:

>
>
> "Victor Cantu Jr." wrote:
>
> > I WILL SOON BE HAVING TO MAKE A PART THAT IS 12 X 6 X 6.250

DEEP. THE PART IS ALUMINUM 70-75. ANY WAYS MY QUESTION IS IT HAS
ALMOST THE ENTIRE CENTER BORED OUT, AND THE BORE GOES ALL THE WAY
THROUGH. BEFORE I GET STARTED I AM HOPING SOMEBODY WILL GIVE ME SOME
ADVICE ON TOOLING AND ALSO HOW YOU THINK YOU WOULD GO ABOUT DOING IT.

>
> This isn't completely clear. Are you saying you need to bore out a

hole, pehaps

> 5 x 5" and 12" deep? This is going to be pretty tricky to hold any

accuracy on

> unless you have a horizontal boring mill. A larger horizontal mill

with the

> arbor running all the way through the work would also work. A

smaller H mill

> just doesn't have the room to accomodate the setup. I don't think

this is a good

> candidate for a vertical mill. You could do it with a long boring

bar, but the

> unsupported far end will make things real difficult. Another

alternative is

> to do it on the lathe with a boring bar held between centers, but

there would

> be a lot of fixturing to do the whole thing, unless the hole is to

be completely

> round, not rectangular.
>
> If I've got this wrong, and the hole is roughly 11 x 5 x 6 or 6.25"

deep, that

> is a bit more approachable on a vertical mill. A boring head migh

be the

> best way, depending on the corner radius. You could start with an

ordinary

> end mill, then flip the work over, or go to an extended shank end

mill.

>

Jon,
Seems clear to me. He states "12 X 6 X 6.250 DEEP."
Where do you get 11 x 5 and 5 x 5" and 12" deep from??