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

This is great; thanks (everyone) for the suggestions. We'll see how
it come out (1st project; should be interesting).

Ken

--- In CAD_CAM_EDM_DRO@y..., Alan Marconett KM6VV <KM6VV@a...> wrote:
> Hi Ken,
>
> This is a complex part!
>
> For the top, do the main, rectangular pocket first, and later on
do the
> arc's from the side to finish.
>
> Think of the bottom work as stages, do a big pocket first, then
follow
> that up with a pair of pockets.
>
> As much metal is being removed, it would be best to drill and bore
while
> the block is most solid. Otherwise, it tends to get springy.
Your part
> has some bored holes going across the part, If they are critical,
then
> they should be done first. It is often difficult to drill and
bore the
> holes from both sides, if their alignment is critical. Otherwise,
it
> may not be as important when you drill them if they are just
mounting
> holes.
>
> For the sequence of steps, you'll be milling in several setups.
Work
> will be on top, bottom, and ALL sides! Square up a block to the
> required finish dimensions first. And select a reference corner
for all
> measurements.
>
> Drill and bore the three critical cross-bores (if that's what they
are)
> first.
>
> Drill and bore the front hole (does it go through to the back?)
next.
>
> The top holes should next be drilled and tapped, before the top is
> milled.
>
> Hog out the top, making a simple rectangular pocket down to the
point
> where there are curves in the corners (we'll do that next from the
> sides).
>
> Turn part on it's side once again, and do the final metal removal
to
> give you the arc's (both sides).
>
> Flip part upside down, and mill out the big rectangle down to the
point
> where the center becomes an island.
>
> Then do the two deeper pockets, which at this point are just the
sides
> (the center is already gone).
>
> So as I see it, you have a "part program" basically for each if the
> sides.
>
> At least that's the way I see it. I'm there are many other ways
to do
> the part.
>
> Interesting project!
>
> HTH
>
> Alan KM6VV
>
> mszollar wrote:
> >
> > Just to digest what you suggest. Say the part I am making is
> > this: "http://www.ronlund.com/Merchant2/merchant.mv?
> >
Screen=PROD&Store_Code=heli&Product_Code=404307&Category_Code=404"
> >
> > What you are saying is that if I where milling the bottom (as
shown
> > in the image) I would have a border (representing the outside)
and
> > (here is where I get lost) 1 rect for the middle and 1 rect for
the
> > ends or do I want 1 rect for the middle and 1 rect for each
different
> > depth milled in the ends? I get lost in the visually there is 1
> > rectangle for each end milling, but that rect is (logically)
broken
> > into 3 rect; 2 outers deeper than the middle.
> >
> > Thanks,
> > Ken