RE: [TCML] New coil and first light

["Craig" <cdumey@xxxxxxxxxxx>]

Joe,

I suppose I got lucky in finding that motor even though I had to totally
rebuild it. I got it off Ebay.

Yes, the UHMW can be a pain to machine. I have found that really sharp high
speed steel tooling works better than carbide inserts. Actually, the first
arbor I made was out of Delrin. I would probably have used it, but it was
poorly balanced. I chose the resin from McMaster for several reasons.
Excellent electrical insulator, fairly high heat tolerance, hardness, the
exotic name "Ultem 1000", and the cool translucent amber color.

It seems to be working out well. I ordered the 1.25 x 3 "disc", as it was
called. The stuff machined great and I had just gotten access to a new mill
with a 3 axis digital readout. I drilled the hole for the tungsten with a
.250 drill bit, but the fit was TOO TIGHT. I had to keep working the
tungsten rod in and out, getting a little farther each time. I guess the
tungsten rod sort of acted like sandpaper. I finally got a good fit where it
goes in by hand pushing pretty hard. The set screw is added safety.

Craig


-----Original Message-----
From: Joe Mastroianni [mailto:joe@xxxxxxxxxxxxxx] 
Sent: Tuesday, September 21, 2010 3:38 PM
To: Craig
Subject: Re: [TCML] New coil and first light

  Hi Craig,

Can I ask, where did you get that teletype motor?  I've been scouring 
the internet world for synchronous motors and I keep striking out.  I 
currently have an 1800rpm Oriental motor, but I'd rather have a 3600 rpm 
2 electrode gap.  Much simpler than the 4 - 8 electrode gap I have now.

Also, that resin arbor - how is it working out.  I like the idea of it 
because as you know the UHMW is not "stiff" and is reasonably difficult 
to machine.  I have a heck of a time with it on my lathe.

Cheers,
Joe


On 9/21/2010 5:53 AM, Craig wrote:
> Hi Joe,
> Thanks for the comments, I appreciate it. I have enjoyed reading your
> coiling chronicles and have learned along the way. A spun toroid would be
> sweet. The current one is 6 x 24, I should have got in on that bulk buy a
> while back.
>
> Craig
>
>
> -----Original Message-----
> From: Joe Mastroianni [mailto:joe@xxxxxxxxxxxxxx]
> Sent: Monday, September 20, 2010 11:09 PM
> To: Craig
> Subject: Re: [TCML] New coil and first light
>
> That is gorgeous, Craig.   Love the secondary ground&  topload
connections.
> Just wonderfully executed.
> I realize its pricey but a coil of that level of art really does deserve a
> spun toroid topload at some point, but Im hardly one to talk.  One of my
> wisest engineering school teachers said the mark of the true engineer is
he
> who can make best use of what is at hand, and your coil is a model.  I
hope
> to do work like that someday myself.
>
> Cheers,
> Joe
>
>
>
>
> On Sep 20, 2010, at 6:53 AM, Craig wrote:
>
>> After months of construction, I have my new coil built and working. 36"
>> strikes on first light! Many thanks to all the people on the TCML for all
>> the posts from which I received great ideas and valuable information. A
>> special mention for JavaTC. Great program and, in my mind, indispensible
> for
>> designing a coil.
>>
>>
>>
>> I built my first coil around 1995, without the aid of the internet. It
>> worked OK, and I fired it up from time to time until this year. I finally
>> got the urge to build a bigger and better one. See the link below for
>> pictures.
>>
>>
>>
>>
>
http://picasaweb.google.com/109604889970826801245/TeslaCoil?feat=directlink
>>
>>
>> Craig
>>
>> _______________________________________________
>> Tesla mailing list
>> Tesla@xxxxxxxxxx
>> http://www.pupman.com/mailman/listinfo/tesla


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