CAD CAM EDM DRO - Yahoo Group Archive

Re: [CAD_CAM_EDM_DRO] Technique for parting a part

Posted by Jon Elson
on 2001-10-26 23:07:16 UTC
Rob wrote:

> While I'm still very much a newbie, I have a question I just can't
> seem to figure out.
>
> If you start with a billet of say aluminum and you want to cut out a
> part, what are the stratagies for removing the part from the excess
> stock material? Should I program my NC code to cut all the way
> through into some scrap material?

Usually, you start off using other machines (bandsaws, for instance)
to cut a workpiece off the stock, leaving just enough extra to correct
for uneven cuts. Sometimes, especially when making many parts, you
can come up with a strategy to mount a long bar in the vise, mill out
the part and separate it from the stock, and then advance the bar for
the next piece. But, usually, a mill is much slower and more wasteful
of material than a saw.

> Also - how about cutting 2 sides of a part? Would you generate NC
> code to cut the first side, then flip the part and run NC code to
> cut the other side?

This is a pretty common practice. I usually hold work in a vise directly.
Sometimes, like when the entire perimiter of a part needs to be cut to
some tricky shape, I bolt the workpiece to a sacrificial fixture or
"scab plate" that is clamped in the vise, so that the workpiece is
held above the vise, and 5 sides can be machined. The less times
you have to remount a part, the more accurate it is likely to be.
(Also, the fewer chances for mistakes.)

Jon

Discussion Thread

Rob 2001-10-26 09:43:34 UTC Technique for parting a part Ethan Vos 2001-10-26 09:47:52 UTC RE: [CAD_CAM_EDM_DRO] Technique for parting a part joevicar3@h... 2001-10-26 10:12:38 UTC Re: Technique for parting a part Rob 2001-10-26 10:35:38 UTC Re: Technique for parting a part npalen@n... 2001-10-26 19:48:44 UTC Re: Technique for parting a part Smoke 2001-10-26 20:53:02 UTC Re: [CAD_CAM_EDM_DRO] Re: Technique for parting a part Jon Elson 2001-10-26 23:07:16 UTC Re: [CAD_CAM_EDM_DRO] Technique for parting a part Jon Elson 2001-10-26 23:21:35 UTC Re: [CAD_CAM_EDM_DRO] Re: Technique for parting a part Ian Wright 2001-10-27 02:11:06 UTC Re: [CAD_CAM_EDM_DRO] Re: Technique for parting a part npalen@n... 2001-10-27 08:34:52 UTC Re: Technique for parting a part