David Hendley on mon 2 sep 02
Dear Paul, A threaded pipe cap will work as an extruder die holder,
but it is really a poor design.
The first Brent extruders used this idea, and they abandoned it
in subsequent models.
The problem is that it is hard to get the cap started on the pipe threads.
It is very easy to cross-thread and mess up the threads completely.
With a large 6 or 8 inch pipe, this would be even more difficult,
and the cap would be quite heavy.
Look around at extruders and you will see the different systems they
use. Brent changed theirs to a system with 2 substantial handles
that locks the cap over two pegs on the extruder pipe.
My favorite system is a cap made from 3 inches of the next size larger
pipe, that will fit over the barrel, with a half-inch long piece of the
barrel-sized pipe welded on one end.
Bolts in 3 drilled and tapped holes hold the die holder in place.
It accommodates all dies from thin ones to very thick ones.
Anyone who wants to build an extruder should, no doubt about it,
no questions asked, buy "The Extruder Book", by Daryl Baird,
published by the American Ceramics Society.
You will see plans for building several extruders, as well as be
able to see all the ways commercial manufacturers have built
theirs.
David Hendley
Maydelle, Texas
hendley@tyler.net
http://www.farmpots.com
----- Original Message -----
From: "Paul" > I want to build a six or eight inch diameter extruder and i have been
trying
> to figure out how come up with a system for holding the dies in place. I
> have heard of using a threaded pipe cap that would screw in place, but
then
> i would have to cut a hole through the center of it. Does anyone know how
Paul on mon 2 sep 02
I want to build a six or eight inch diameter extruder and i have been trying
to figure out how come up with a system for holding the dies in place. I
have heard of using a threaded pipe cap that would screw in place, but then
i would have to cut a hole through the center of it. Does anyone know how
this is done? The only way i can think of is with a blow torch, although it
may be hard to cut a perfect circle that way. If anyone has done this, or if
they have another method of holding dies in place please let me know. I am
interested in the steel pipe style, rather than the PVC type. Thanks
Paul Borian
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