133 lines
6.4 KiB
Plaintext
133 lines
6.4 KiB
Plaintext
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(word processor parameters LM=8, RM=75, TM=2, BM=2)
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Taken from KeelyNet BBS (214) 324-3501
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Sponsored by Vangard Sciences
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PO BOX 1031
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Mesquite, TX 75150
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There are ABSOLUTELY NO RESTRICTIONS
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on duplicating, publishing or distributing the
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files on KeelyNet except where noted!
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March 2, 1994
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BOLTBAR.ASC
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This file shared with KeelyNet courtesy of Gerald O'Docharty.
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Excerpted from "The Tesla Phile" newsletter of May 1985 written by
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the late Peter Lefferts. Provided by Gerald O'Docharty Feb. 1994
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BOLT BARRIER, compound for Tesla coils
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PURPOSE
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To have an easily castable compound for insulation that is tough yet
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slightly resilient so that stress cracks will not occur. Available
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kitchen materials and low melting point are very important. My
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primary use will be to cast insulation between the primary and
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secondary using cardboard molds. The object is to wind the primary
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closer to the secondary, depending on the insulation to prevent
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flashovers between the two windings.
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MATERIALS
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Paraffin, shredded soft polyethylene (old, translucent, coffee can
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lids etc.) (maybe clean clear polyethylene sheeting commonly
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available. G.O'), salt, & two large pots... one of which will sit
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easily inside the other. These pots should be stainless steel or
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good uncracked glass-porcelain covered.
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PREPARATION
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First step is to make up a high temperature double boiler where the
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inner pot sits in the water. Some sort of support is needed so the
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inner pot doesn't sit on the bottom. Put enough paraffin blocks in
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the inner pot to supply the expected need. The inner pot will have
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to be weighted down because the outer pot should have enough water
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added to come about an inch above the melted wax level.
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Boil the water while adding salt to it until no more salt will
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dissolve. this raises the boiling point for a better product, yet
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greatly decreases the chance of flames.
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COMPOUNDING
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When the water is at a medium boil with most salt dissolved and the
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wax melted, start adding the slivers of flexible polyethylene
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(avoiding other plastics that are stiffer or make a white line when
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creased).
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Page 1
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Stir every few minutes to prevent the poly from sticking to the
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bottom and browning the wax. When about 1/2 the poly appears melted,
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add some more. Add water slowly to the outside pot to keep the level
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an inch higher than the plastic level of the inner pot.
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As soon as a hint of cloudiness appears in the mixture, or the
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consistency of thin oil appears, stop adding poly, and heat and stir
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a little longer.
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CASTING
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A mold of good dense cardboard, glued watertight sides and bottom
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with ample epoxy should be prepared well ahead of time, also seal
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any wire joints likewise. Do not use other plastics such as Acrylics
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as molds, practically all epoxies and hard magnet wire insulations
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will stand up to the heat and solvent characteristics of this
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compound.
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Pre-heat the mold cavity using an oven for small objects, or hair
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drier for larger ones. If oven, pre-heat it 250 deg.F. and wait
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until well stabilized before putting object in. If hair drier, heat
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until a metal part will sizzle slightly when touched by a wet
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finger.
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Be sure that if a Tesla primary is being molded that several taps
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for tuning are brought out through the mold. Also if you want to
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take the cardboard off later, smear the inside with silicone grease
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(easier to paint the cardboard though).
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Pour rapidly without splashing; this stuff burns skin worse than
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boiling water. Shake gently to bring up bubbles. If a small leak
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appears, patch with magic tape and blow with hair drier on cold
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setting until the plastic in the leak has well solidified.
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FEATURES
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Bolt barrier is at least an 8 times better insulator than air. It
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can be carved quite easily and very smoothly, and in fact may make
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an excellent amateur's sculpture media.
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If done slowly, the material can be drilled and sawed with ease. It
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makes good light duty custom bearings for models etc. Almost any
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household solvent may be used for short term cleaning without
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effect...turpentine has some polishing action.
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If you have comments or other information relating to such topics
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as this paper covers, please upload to KeelyNet or send to the
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Vangard Sciences address as listed on the first page.
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Thank you for your consideration, interest and support.
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Jerry W. Decker.........Ron Barker...........Chuck Henderson
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Vangard Sciences/KeelyNet
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If we can be of service, you may contact
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Jerry at (214) 324-8741 or Ron at (214) 242-9346
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Page 2
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