Re: newbe CAD/CNC question - trying to get past 1st base!

--- In CAD_CAM_EDM_DRO@y..., Alan Marconett KM6VV <KM6VV@a...> wrote:

> For the top, do the main, rectangular pocket first, and later on do

the

> arc's from the side to finish.
>

If I was going to make just one, I would probably just drill through
where the radius is and then pocket down to where it starts from the
top, and then to inside so that the end mill stays away from the
radius. I would not try to cut that radius all the way through with
the side of an end mill. Guaranteed to chatter. It will probably
squeal real loud if you only try to go 1/2 way too.

One problem with a "swiss cheese" kind of part like this, is that as
the metal is removed, usually the entire form will twist and warp,
leaving things in the wrong places. It might be necessary to leave
some stock all around and then after all is roughed out, go back and
resquare/finish the length width and height, take skim finish cuts on
the milled surfaces that are critical, and THEN machine the holes.
This depends on what you need to do with the part.

From the picture I have no idea as to the material or the size. If
it is a 12" cube, look out. If a 1 1/2" (most likely for only $30)
it might not be a problem in any event. Also the radii may not be
critical and could be machined square.

Best Regards,

Fred Smith
IMService