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Looking for a 20" or 16" belljar and a Vacuum wax


#1
   Aloha,living on an island has several drawbacks,supplies is
one.A friend of mine needs a 16 0r 20" belljar  

You can construct a container that will serve the same use as a
bell jar. Go to a plastics supply house and purchase a piece of
lexan tube in the diameter that you need the container to be. Make
sure that it is at least 1/2 inch thick you get it cut as tall as
you would like the container to be. Place over one end of the tube
a flat piece of lexan sheet also at least 1/2 inch thick. Use
silicone caulk on the outside to seal the two together. Do not put
the sealant on the inside as it will pull away from the seam. Also
do not use plexy glass as it will shatter under a vacuum. Lexan or
some other polycarbonate is shatter resistant. In this way you can
construct a container to the specifications you desire. Ptock


#2

Aloha Ptock, Thanks for the advice.I have used that method
before(though it was not 1/2"or lexan).Thought I could find a used
one,that someone wasn’t using any more.I was searching for a
friend,to aid his production and looking for the Vacuum wax
injector w/auto clamp for myself.I will pass it on(your
e-mail).Thank you. Regards, Christian Grunewald Precision Modelmaking H
awaii


#3

FWIW

  Place over one end of the tube a flat piece of lexan sheet also
at least 1/2 inch thick. Use silicone caulk on the outside to
seal the two together. Do not put the sealant on the inside as it
will pull away from the seam. 

If you get the ends machined square (flat) you can ‘weld’ the top
plate t o the tube with ‘MEK’ (methyl ethyl ketone). It’s used to
make solvent weld s on many plastics. The open end should also be
machined flat to give you a good seal between the tube & the vacumn
table.

To use it, the end of the tube must be flat. There can’t be any
gaps (eve n little ones) between the tube & the top. Clean the top
piece & the end of the tube with denatured alcohol to remove any
oil & grease. Place the tub e on the clean side of the top plate
(be sure you can reach in the tube & touch the top plate). Place a
small guage needle, 20 guage or smaller, on the MEK dispenser. Run a
bead of MEK (MEK is thinner than water) around t he outside of the
tube were it contacts the top plate. Capillary action will draw the
MEK into the joint. Run a second bead of MEK around the inside o f
the tube where it contacts the top plate.

Stores that sell the plastic will have the MEK & the applicator
needles. A well equiped hardware store will also have the MEK &
applicators.

Dave