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Re: Scroungein' (fwd)

to: Chris

With this large sec size you will definitely need to use a flat spiral to
avoid overcoupling.  Sec wire size should be around 20-22 AWG.   26 AWG is
too small.  You will also be stressing the magnet wire somewhat so be sure
to use NEW not surplus 200 degree C hi-temp magnet wire.  Any small nicks or
abrasions in surplus wire will destroy your coil rapidly.

Use a small 12-16 RPM Bodine surplus motor for winding between two saw
horses.  Use a surplus relay and surplus footswitch to help with the
winding.  Have a friend help feed the wire on the coil with tension while
you run the footswitch.  Use scrap plywood plates for the end plates for
winding.  Later, cover with formica for a nice finish and use as endplates
for your coil.

Use a synchro rotary gap to achieve best performance.  If you need a motor
we have several in stock at reasonable cost.  I don't think you will hit
your performance goal with a static gap.

Don't worry about the primary.  Use some scrap 10 AWG wire first (18-24
turns) and then discard later after you have found your resonance point.
Replace at that time with copper tubing.  Scrape off a section of PVC on
each turn for test connections.  Stagger the test points around the coil.

Regards,

Dr.Resonance-at-next-wave-dot-net


-----Original Message-----
From: Tesla List <tesla-at-pupman-dot-com>
To: tesla-at-pupman-dot-com <tesla-at-pupman-dot-com>
Date: Sunday, April 18, 1999 3:11 AM
Subject: Re: Scroungein' (fwd)


>Original Poster: "christopher boden" <chrisboden-at-hotmail-dot-com>
>
>Due to constant design changes and new ideas....not to mention a
>through flogging from Sam ;-) we are trying two seperate ideas.
>
>Project 1
>Design Goal: To produce 5' discharge from a 120VAC <20Amp input.
>Secondary size: 25" X 4"
>Secondary winding: 26 AWG? (any ideas?)
>Secondary form Schedule 40 PVC 4" pipe with glued on endcaps
>Winding method: Lathe....BIG lathe.
>Primary winding: 1/4" soft copper tubing
>Primary form: Flat helix?
>Primary size? Number of turns/spacing????? any ideas?
>Caps: Where can we get some? What size do we need? How long will they
>last? We need rock-solid-reliability.
>NST: 15KVAC -at- 30mA
>Variac: ? what size do I need 20A?
>Spark Gap:Static (no shrapnell) possibbly the Quick model
>Torus: ?? biggest possible?
>Anything else? What am I forgetting?
>
>Prodect 2
>Coil Name: Thor
>Secondary size: 12" X 5' twin secondaries
>Secondary wire: 18AWG
>Secondary Form: 2  1X5" Sonotubes 1/4" Cardboard tubes
>Primary Wire: 3/8" Soft copper tubing
>Primary Size: ?
>Primary Form: Flat Helix
>Power Supply: 20KVA Pole Pig (Supplier?)
>Spark Gap: 4 Pole Async Rotary in a 1.5" Lexan Enclosure (ideas?)
>Control Circuitry:?? Ideas?
>Caps: Big... Ideas? Suppliers? MMC?
>
>Possible "Magnifier" setup insted of twin secondaries?
>
>Design Goal: Biggest possible discharge:
>
>Both coils will be housed in a dediated "High Voltage" room.
>Room dimentions : 70' Long X 32' Wide X 23' High
>Raised wooden floor (concrete floor 3' below for 26' ceiling height)
>can be remooved if needed.
>Brick walls 3-5' thick
>Dual RF dedicated grounds to 10' Ground rods on 0AWG ACSR conductors.
>Concrete ceiling with 3' X 6" I-Beams every 3'
>
>Power supply (Mains): 480VAC -at- 500Amp 3Phase to 100 KVA Stepdown (220)
>
>Control room will be next to the HV room with interlocks preventing
>the doors to the HV room being opened while the mains to the TC are
>energized.
>Both coils will require a key to arm the system and a button to be
>held to power the NST/pole pig.
>Thor will require 2 Keys 6' apart to arm the system and a button to
>arm the Pig.
>
>There may be a Faraday cage in the HV room for viewing, if this can
>be done with ABSOLUTE safety to persons/ cameras inside...any ideas?
>
>
>
>Christopher A. Boden
>The Geek Group
>344 Ionia SW
>Grand Rapids MI
>49503
>(616)-574-4065
>
>The Geek Shall Inherit the Earth!
>
>
>_______________________________________________________________
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>