Norman Aufrichtig on fri 23 dec 05
I have a small Peter Pugger VPM-20, am at 7000 ft altitude, get 20 PSI.
It's a relatively new purchase and am generally pretty happy with it except
for a few small problems.
When starting to extrude have to throw the first 10 or so inches back into
the extruder, has air in it, always a big bubble after about 4 inches and
sometimes what seem to be hundreds of little bubbles which aren't apparent
till I start using the clay. Use the pugger mainly to get the clay to the
softness I prefer and to reprocess trimmings, use B mix. except for this
problem am happy with the machine.
I used a studio Bluebird extruder before this, got about 15 PSI vacuum, it
is a old machine which I rebuilt at least three times since i bought it in
1981,but if I remember the most vacuum I got with it even at sea level was
about 20 PSI, but that was in the eighties and I really don't remember,
used the small Bluebird mixer to soften the clay then pugged it. Went to the
Peter Pugger to get rid of a lot of the labor, was successful. I also had a
machine shop increased the diameter of the pug extrusion on the Bluebird,
and they did it for me at Peter pugger when I purchased the machine.
Norman
----- Original Message -----
From: "Ivor and Olive Lewis"
To:
Sent: Monday, December 12, 2005 10:10 PM
Subject: [CLAYART] Pug Mill Information
Dear Friends,
I am seeking information about the pressure exerted by the vacuum pumps of
the pug mills you are using. There must be a few since we appear to number
+++2000 and many of you must have access to them in schools or colleges.
I have information from one of the manufacturers expressed a negative
kilopascals. If your gauges are in PSI or some other scale do not worry, I
should be able to do the conversions.
Pascals pressure by the way is Force in Newtons per Square Metre.
It may be that no one has ever thought to analyse the exhaust from a pug
mill. Would it be useful knowledge ?. To any one else possibly not. But to
me it could be enlightening.
Thanks in advance.
Best regards,
Ivor Lewis.
Redhill,
South Australia.
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