Re: [CAD_CAM_EDM_DRO] I'm impressed. Anyone want to write the G-Code for this?

Jon, the problem of weakness can be overcome (as I mentioned once before)
the same way we firearms engravers do to reduce vibration in a receiver as
its\'s being engraved.
place a plastic bag filled with auto body putty (Bondo) in the cavity and
let it set. Voila, instant backup which can be machined into without tool
damage and is easily removed when your done. It's a good trick to use while
CNC machining some parts as well.

Using this technique, you can machine the holes in either order...from small
to large or large to small.

Smoke

> Actually, I'm not sure you need CNC to do this. If it was all done on a
> milling machine, then, yes. I think it could all be done on a lathe,
> with a lot of repositioning. A fixture to hold it might be helpful there,
> as
> you have to turn it a bunch of times. The ID of the bores looks

cylindrical

>
> to me, but I can't be sure. I think you'd do the bores starting from the
> smallest diameter and deepest, and then work outward, sort of burning
> your bridges as you go, as the last of 6 bores is done, the inner part
> is left weakly supported. But, then you won't be stressing it any more,

as

> you will be working on the next cube outward.
>
> On a CNC mill, you could probably do all the bores on one face at a time,
> only having to position the part 6 times. The last face might be tricky,
> requiring slower feed to avoid bending the outer cube, although it looks
> like it has enough material to be fairly rigid.
>
> I might have to try one of these, sometime!
>
> Jon