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Re: [TCML] Re: A new guy with a primary threaded through holes
For bonding acrylic WELDON is the stuff you want. it not so much a glue but more literally a chemical weld. essentially it is dissolved acrylic in a suspension, when you apply it to the acrylic surfaces the suspension evaporates and the dissolved acrylic molecularly bonds to the already present plastic.
http://www.ellsworth.com/display/productdetail.html?productid=804
Thanks,
John "Jay" Howson IV
----- Original Message -----
From: "Richard Schmuke" <rdj@xxxxxxxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Tuesday, May 18, 2010 11:57:11 AM GMT -05:00 US/Canada Eastern
Subject: RE: [TCML] Re: A new guy with a primary threaded through holes
I have a question about the Lexan , I have some 6mm thick that I use in my
projects , I find I have to drill and tap it for machine screws to get it to
hold. What brand and type of adhesive did you use? I tried one that was
supposed to be for polycarbonate but it did not work on Lexan near as well
as gluing acrylic to acrylic. My coil supports would craze at the joint and
break. One of my projects is a power supply, you can see it at,
http://www.flickr.com/photos/kd0zz/
Rich / KDØZZ
-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of Joe Mastroianni
Sent: Tuesday, May 18, 2010 8:54 AM
To: tesla@xxxxxxxxxx
Subject: [TCML] Re: A new guy with a primary threaded through holes
One thing I found is that toward the end I was really "manhandling" the
coil. I grabbed each side of the outer coil at 10 and 2 o'clock, sort of
like the steering wheel of a car, and I would attempt to turn the thing. It
took quite a bit of force even to get a millimeter or two. Once I had some
"slack" introduced to the outer turn the innermost turn would sort of "break
free" and I could twist it a couple millimeters.
I repeated this for some large number of hours. Let's say that yesterday I
started at about 8 AM and net a 90 minute lunch break and lots of coffee
break time, I didn't finish until roughly 5PM, all of which suggests I am
probably a man with too much time on his hands. It's a kind of zen koan
sort of process. Sort of like mowing a golf course with a 22" Sears push
mower.
The amount of force I applied consistently and the length of time I had to
do it is a testament to the strength of the binding power of the acrylic
cement. Seriously, when it binds it's as if the 2 plastic pieces just
become one piece. I experienced no give, no cracking, no movement
whatsoever between the stanchions and the lexan base disc. I am what might
be called in some circles, a reasonably "large" guy with a rational amount
of arm strength for my size. I figured if I broke the thing I was no worse
off.
It didn't break. Maybe I need to start bench pressing with heavier weights.
Now that I know how long it takes to do this and the effort involved I am
not sure I would go through the trouble again, even though the results are
pretty durned nice. But as you pointed out, it's entirely doable. You just
need to not have anything else important in your life going on.
Oh well. Onward to fabricating my MMC and Terry Filter!
>I managed to wind 50 feet in, then splice another piece to complete nearly
20 turns of 1/4". I'm sure I could have gone into pages of technique, if
asked. As you discovered, there only a handful >of us who have succeeded, so
no one's really interested in technique. At first the whole thing rotates,
but pretty soon, you become master of scootching. I used Lexan and my glue
failed >partway into the wind. I unwound the forms a fraction of a turn then
screwed it into the base._______________________________________________
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