Re: [CAD_CAM_EDM_DRO] Re: Technique for parting a part

I'm doing something similar. I've got a big fixture designed which will
have removable plates bolted to it to which stock to be machined will be
clamped. The removable plate will be machined parallel to the table after
it is bolted in place. This fixture allows me to use the same origin for
all parts (I have about forty or so to do for various gun part molds) and
allows the edges of the parts to be finished all the way down to the plate
(the cutter cuts right into the plate when edging). When the plate gets
"chew up" excessively, it can be replaced. There are a series of tapped
holes for bolting on the plate so I can use whatever size plate fits the job
at hand. Normally the stock to be machined would be clamped in place, but
it would certainly be feasible to epoxy them in place if necessary. Epoxy
can be removed wit a small amount of heat. Anything left on the plate could
be machined away to maintain a flat surface for the next part. The finished
surface of the plate is ALWAYS the zero point for the Z axis. This also
provides a benefit of always working to positive dimensions for the Z axis.

Smoke

----- Original Message -----
From: <npalen@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Friday, October 26, 2001 8:48 PM
Subject: [CAD_CAM_EDM_DRO] Re: Technique for parting a part


> Rob and all--I use superglue (cyano-acrylate or CA) quite a lot for
> fixturing parts that don't lend well to normal clamping or holding
> methods. (Within reasonable limits of machining force) The thicker
> grade (syrup consistency) works good, make a few small puddles and
> set the part down on a flat sacrificial plate of aluminum, mdf or
> whatever. Aluminum seems to work good as it seems to hold well and
> can be scraped clean for the next part. A knife tapped into the glue
> joint will seperate it after machinining your part(s) In the case of
> the box example, the part and the scrap can both stay glued down
> until finished machining. Anyone else do this?
> Nelson
>
>
>
>
> --- In CAD_CAM_EDM_DRO@y..., "Rob" <robv@s...> 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?
> >
> > 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?
> >
> > Thanks everyone, you have been most helpful in getting me up and
> > running in the world of CNC mills and lathes.
> >
> > Rob
>
>
> Addresses:
> FAQ: http://www.ktmarketing.com/faq.html
> FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
>
> Post messages: CAD_CAM_EDM_DRO@yahoogroups.com
> Subscribe: CAD_CAM_EDM_DRO-subscribe@yahoogroups.com
> Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@yahoogroups.com
> List owner: CAD_CAM_EDM_DRO-owner@yahoogroups.com, wanliker@...
> Moderator: jmelson@... timg@... [Moderator]
> URL to this page: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
> bill,
> List Manager
>
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
>