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Domain > www.flockingmonkeys.org
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Date
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2024-10-24
178.209.40.84
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HTTP/1.1 200 OKAccept-Ranges: bytesAlt-Svc: h3:443; ma2592000Content-Length: 9425Content-Type: text/html; charsetutf-8Date: Thu, 24 Oct 2024 03:59:25 GMTEtag: qjp1op79tLast-Modified: Thu, 12 Nov 2020 17:24:25 GMTServer: CaddyServer: Caddy HTML>HEAD> TITLE>Mike and Alans Tesla Coil Site/TITLE> META NAMEROBOTS CONTENTNOINDEX,NOFOLLOW> LINK RELstylesheet HREFtesla.css TYPEtext/css>/HEAD>BODY LINK#BBBBFF VLINK#BBBBFF>!-- Outer table -->TABLE BORDER0 CELLPADDING0 CELLSPACING0 WIDTH600>TR>TD>H1>Mike and Alans Tesla Coil Site/H1>H2>Introduction/H2>Were based on the Isle of Anglesey, North Wales. Alan lives on the south-west coast,and Im a few miles north in the village of Rhosneigr.P>Im a software engineer by profession (thats a computer programmer in theold money) and amongst other hobbies, have built lots of electronics projectsover the years. Theyve been mainly digital stuff, so tesla coils are arefreshing change. In the tesla building partnership, I do most of theconstructional work.P>Alan owns and runs a company specialising in wiring harness manufacture.Hes the expert scrounger in the partnership, sourcing the materials andcomponents needed. Hes obtained near impossibilities such as the pole transformer and the 20A variac that will form components for the secondand very much larger tesla coil. More about that later.H2>Mark I Specification/H2>Our first coil is largely based on Nick Fields design, which was published in Everyday Practical Electronics magazine (EPE), March 2001 issue. Wevesubstituted a larger neon sign transformer though, replacing the 10kV 50mAversion described in the article with a 10kV 100mA version, also supplied byTunewell Transformers. Additionally, weve replaced the original aluminiumfoil coated discharge sphere with a toroid made from a 1 metre length of 4inch diameter corrugated aluminium vent tubing.P>It was completed in late 2001 and has proved to be very reliable, the onlyproblems being an occasional blown fuse in the controller and the static gaprequiring periodic adjustment. Weve had strikes of just over 1 metre, which ispretty spectacular (and very noisy!). The last image in the series below wasa distance of about 80cm, the target being a lager can, earthed to encourage astrike.P>The main components:UL> LI>Transformer - Tunewell 10kV 100mA NST LI>Static Spark Gap - 7 off 22mm dia x 120mm long copper tubing LI>Capacitor - 3 x 16 47nF 1.5kV strings in series giving 15.6nF at 19.2kV LI>Primary Coil - 10 turns 6.5mm copper refrigeration tubing LI>Secondary Coil - 800 turns 0.6mm magnet wire on 4 dia x 20 inch former LI>Controller - 8A variac with safety cut-outs as per Nick Fields design/UL>H2>Results/H2>!-- Image thumbnails -->A NAMEresults>/A>TABLE BORDER0>TR> TD VALIGNtop> A HREFi20020131-07.html onMouseOverdocument.th07.border1 onMouseOutdocument.th07.border0>IMG NAMEth07 SRCi/thTesla20020131-07.jpg ALIGNleft WIDTH128 HEIGHT80 BORDER0 ALTClick for larger image>/A> A HREFi20020131-08.html onMouseOverdocument.th08.border1 onMouseOutdocument.th08.border0>IMG NAMEth08 SRCi/thTesla20020131-08.jpg ALIGNleft WIDTH128 HEIGHT78 BORDER0 ALTClick for larger image>/A> A HREFi20020131-02.html onMouseOverdocument.th02.border1 onMouseOutdocument.th02.border0>IMG NAMEth02 SRCi/thTesla20020131-02.jpg ALIGNleft WIDTH128 HEIGHT76 BORDER0 ALTClick for larger image>/A> A HREFi20020131-03.html onMouseOverdocument.th03.border1 onMouseOutdocument.th03.border0>IMG NAMEth03 SRCi/thTesla20020131-03.jpg ALIGNleft WIDTH128 HEIGHT73 BORDER0 ALTClick for larger image>/A> /TD>/TR>TR> TD VALIGNtop> A HREFi20020131-04.html onMouseOverdocument.th04.border1 onMouseOutdocument.th04.border0>IMG NAMEth04 SRCi/thTesla20020131-04.jpg ALIGNleft WIDTH128 HEIGHT82 BORDER0 ALTClick for larger image>/A> A HREFi20020131-05.html onMouseOverdocument.th05.border1 onMouseOutdocument.th05.border0>IMG NAMEth05 SRCi/thTesla20020131-05.jpg ALIGNleft WIDTH128 HEIGHT74 BORDER0 ALTClick for larger image>/A> A HREFi20020131-01.html onMouseOverdocument.th01.border1 onMouseOutdocument.th01.border0>IMG NAMEth01 SRCi/thTesla20020131-01.jpg ALIGNleft WIDTH128 HEIGHT75 BORDER0 ALTClick for larger image>/A> A HREFi20020131-06.html onMouseOverdocument.th06.border1 onMouseOutdocument.th06.border0>IMG NAMEth06 SRCi/thTesla20020131-06.jpg ALIGNleft WIDTH128 HEIGHT58 BORDER0 ALTClick for larger image>/A> /TD>/TR>TR> TD VALIGNtop> A HREFi20011123-01.html onMouseOverdocument.th09.border1 onMouseOutdocument.th09.border0>IMG NAMEth09 SRCi/thTesla20011123-01.jpg ALIGNleft WIDTH128 HEIGHT81 BORDER0 ALTClick for larger image>/A> /TD>/TR>/TABLE>H2>Mark II/H2>The next attempt is slowly coming together. The lastest major component completed isthe primary coil,which is constructed from 8mm microbore copper tube, mounted on uPVC supports. The baseis from an old circular table and, being some sort of resin moulding, is lightweight. Sincethe primary coil image below was taken, Ive added a safety strike ring and terminalconnections to complete the assembly.P>The secondary coil former is a length of sewerage pipe, which Alan scrounged from aroadside repair in Southern Ireland. After several coats of polyurethane varnish, itwas wound in a surprisingly short time (around 2 hours) with 18swg enamelled wire,using a modified wire reeling machine and two pairs of hands. A couple of coats ofvarnish were applied while it was rotating, with a warm air blower encouraging thedrying process.P>Ive been experimenting with a rotary spark gap, but have had problems trying to getthe motor to lock on to the mains frequency (50Hz). The motor Ive used is a capacitor-start 3000rpm 120v ex-computer disk drive, using a step-down transformer.From various bits of information gleaned from the web, I gathered that to convertit to salient pole operation, the rotor required flats machining (for a 3000rpm motor,4 flats at 90 degrees to each other) which Ive done, using the machine shop at thelocal college. However, it doesnt seem to reach 3000rpm, as Ive used a neon connectedto the mains power as a strobe, and I dont get a stationary image of the rotor shaft.Ah well, thats what experimentation is all about!P>Weve found a possible capacitor (50kV, 1uF) sourced from Ebay. Thisis probably a higher value than I would have chosen, and not as versatile as the MMC(multi-miniature capacitor) pack used on the first coil which could be configured todifferent values, but it seemed too good to pass over. Well see how it performs.P>Once weve built the toroid (this will be 12 inch ducting, with an outerdiameter of around 41 inches) well probably try a test run using the transformer,capacitor pack, gap and controller from the first coil.P>The main components so far acquired or built:UL> LI>Transformer - English Electric 5kVA 11kV/250V circa 1960 LI>Variac - Zenith Electric Co Ltd 20A 0-270V LI>Secondary Coil - custom-built 66 inch length by 12.5 inch dia, 1200 turns of 18swg LI>Primary Coil - 18 turns of 8mm copper tubing, 42 inch outside dia/UL>P>Ill post pictures of the main components as the building work progressesP>TABLE>TR> TD VALIGNtop> A HREFi20020123-01.html onMouseOverdocument.th10.border1 onMouseOutdocument.th10.border0>IMG NAMEth10 SRCi/thPig20020123-01.jpg ALIGNleft WIDTH128 HEIGHT102 BORDER0 ALTClick for larger image>/A> A HREFi20020331-01.html onMouseOverdocument.th11.border1 onMouseOutdocument.th11.border0>IMG NAMEth11 SRCi/thVariac20020331-01.jpg ALIGNleft WIDTH128 HEIGHT96 BORDER0 ALTClick for larger image>/A> A HREFi20020628-01.html onMouseOverdocument.th12.border1 onMouseOutdocument.th12.border0>IMG NAMEth12 SRCi/thSecCoil20020628-01.jpg ALIGNleft WIDTH127 HEIGHT95 BORDER0 ALTClick for larger image>/A> A HREFi20030704-01.html onMouseOverdocument.th13.border1 onMouseOutdocument.th13.border0>IMG NAMEth13 SRCi/thPriCoil20030704-01.jpg ALIGNleft WIDTH127 HEIGHT95 BORDER0 ALTClick for larger image>/A> /TD>/TR>/TABLE>H2>Related Links/H2>UL> LI>A HREFhttp://www.tunewell.com>Tunewell Transformers Limited/A> LI>A HREFhttp://www.redileads.co.uk>Redileads Anglesey Limited/A> LI>A HREFhttp://www.epemag.wimborne.co.uk>Everyday Practical Electronics Magazine/A> LI>A HREFhttp://www.tcbouk.org.uk>Tesla Coil Builders of the UK/A>/UL>P>Special thanks to Graham A. Stephen for designing this site, plus the long-exposurephotography and subsequent image scanning, resizing, retouching, thumbnailing...P>/TD>/TR>/TABLE>!-- Outer table -->!-- Credit --> BR clearall>BR>BR> TABLE border0 alignright>TR>TD>CENTER> FONT color#FFFFFF facearial size2>B>Site design by/B>/FONT>BR> A hrefhttp://www.conceptspace.co.uk>IMG width62 height26 srci/csLogoSmall.gif altConceptSpace border1 vspace5>/A> /CENTER>/TD>/TR>/TABLE> !-- /Credit -->!-- Last Update -->CENTER>Last updated March 14 2004/CENTER>!-- /Last Update -->/BODY>/HTML>
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