primary hold down's

From:  D.C. Cox [SMTP:DR.RESONANCE-at-next-wave-dot-net]
Sent:  Saturday, March 07, 1998 5:37 PM
To:  Tesla List
Subject:  Re: primary hold down's

to: Walt

Use a slightly larger piece of plastic (wider) than you need.  Drill your
holes in it for the refrig tubing, and then cut the plastic down the
middle.  You now have a matching plastic "cap" that matches your original
piece.  You can use small 10-24 nylon plastic machine screws to attach your
"cap" over the notches in your plastic holder as the caps now also have the
same matching notches.  We use this technique with 3/8 wide delrin plate
stock to make primary holders when ever we have to hang a TC in the
inverted position.  You might have to increase your plate stock to 3/8 inch
thick as the 1/4 inch thick material might be difficult to drill and tap
without cracking the narrow plastic.


> From: Tesla List <tesla-at-pupman-dot-com>
> To: 'Tesla List' <tesla-at-pupman-dot-com>
> Subject: primary hold down's
> Date: Friday, March 06, 1998 10:08 PM
> ----------
> From:  Walt Kulpa [SMTP:gwkulpa-at-earthlink-dot-net]
> Sent:  Friday, March 06, 1998 12:27 PM
> To:  tesla-at-pupman-dot-com
> Subject:  primary hold down's
> Hi, I'm working on the form for my 1/4" refigerator tubing primary. 
> I'm planning on using 1/4" polycarb for the support fins. I've got the 
> calculations made on where to notch the plasitc in order to create a 
> nice uniform  30degree slope and 15 degree rise with 1/4" spacing 
> between turns, but what I don't have is, what can i do for holding the 
> tubing into the notches? I don't want to just let it lay there, do I?  
> I'm not so sure that adehesive is a good idea, is it? How is holding the 
> tubing into the plastic commonly done?
> Thanks, Walt Kulpa