Re: [CAD_CAM_EDM_DRO] part holding

Hi Bill

Thanks for the info. I have always been interested in those "old school"
tricks of the trade. Modern technology is great but sometimes it's the old
fashioned method that will do the job.

Bob

----- Original Message -----
From: "Bill Vance" <ccq@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Friday, September 03, 2004 3:50 AM
Subject: Re: [CAD_CAM_EDM_DRO] part holding


>
> Howdy Bob;
>
> Sorry, forgot to include my source. I got the recipe from, "Workholding
In The
> Lathe", by Tubal Cain. A, "turner", is one who works on a lathe. Resin,
or
> common resin, if memory serves, is simply pine sap, or pitch, warmed up
enough
> to flow through a filter. A no holes type face plate used in this manner
is
> generally refered to as a, "shellac chuck". He had another recipe that he
said
> was stronger, using shellac and powdered pumice, but also mentioned that
it was,
> "a pig to make". He shows several methods for using shellac on a
watchmakers
> lathe, and also said that this was a common thing to see in metal working,
but
> declined in usage somewhere after the turn of the last century. I'd guess
that
> would probably be due to setup time, and a bit of mess to clean up
afterewards.
>
> Bill
>
>
> On Fri Sep 3 01:30:55 2004 Bob Muse wrote:
>
> >Hi Bill
> >
> >I have used "superglue" to hold parts, but I've never heard of "turner's
> >cement". What exactly is common resin?
> >
> >Bob
> >
> >----- Original Message -----
> >From: "Bill Vance" <ccq@...>
> >To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> >Sent: Friday, September 03, 2004 12:40 AM
> >Subject: Re: [CAD_CAM_EDM_DRO] part holding
> >
> >
> >> On Thu Sep 2 20:50:35 2004 skykotech wrote:
> >>
> >> >The hardest part about cnc is not the electronics, the servos, the
> >> >ballscrews. The hardest part is holding down the friggen part! I
> >> >just ruined yet another brand new 1/2" made-in-usa endmill when my
> >> >program had a rapid that went .010 too close to a holddown clamp at
> >> >120IPM. Doh! I wouldn't have had things so close to the clamps if
> >> >it were not for the fact that I wanted to machine everything at once
> >> >without remounting the part. How do you guys hold down a part when
> >> >you want to machine 5 surfaces on it? Vacuum table? Glue? :-)
> >> >
> >> >Good thing Enco still has that free shipping going on...sigh
> >>
> >> You could try old fashioned, "turners cement". Take 3 parts common
resin,
> >and
> >> one part beeswax, heat slowly, stir well, and pour into stick molds.
For
> >use on
> >> a mill, i'd use a flat piece of metal for clamping, rub the stick on
it,
> >heat
> >> it, and press your work piece down on it till cool. To release it,
hold a
> >piece
> >> of wood against the side, and give it a rap with a hammer. Holding
power
> >is
> >> about 200 pounds per sq. inch.
> >>
> >> For lathe work, say you wanted to turn some washers to exact thickness,
> >you'd
> >> want to rub a stick against the face plate, and hold the washers
against
> >it
> >> until warm, and then just let go. Make a very gentle facing cut across
> >the
> >> washers, pop them loose, reverse, and reapply them to the face plate,
and
> >then
> >> start facing them to thickness.
> >>
> >> Bill
>
> --
>
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