Re: multiple gap question

To: tesla-at-pupman-dot-com
Subject: Re: multiple gap question
From: "Steve Cook" <Steve-at-g8cyerichmond.freeserve.co.uk> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
Date: Sat, 12 Feb 2000 13:43:36 -0700
Approved: twftesla-at-uswest-dot-net
Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

I have used offcuts of plastic sheeting (polystyrene) to set gaps. My local
model shop stocked it for a while a few years ago, in a variety of
thicknesses from 10mil up in increments of 5mil.
----- Original Message -----
From: Tesla List <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Saturday, February 12, 2000 1:28 AM
Subject: Re: multiple gap question


> Original Poster: Parpp807-at-aol-dot-com
>
> In a message dated 2/11/00 2:33:18 AM Central Standard Time,
tesla-at-pupman-dot-com
> writes:
>
> <<  Mine were gapped at about 0.03", I used a feeler gauge to verify that
>  all segments were parallel to one another.  Are yours reasonably
parallel? >>
>
> Hi Gary,
> What's "reasonably parallel?" That's part of my problem and I am wondering
if
> anyone has developed a particular technique for spacing the couplings? I
have
> mine mounted on 8-32 screws and fixed with nuts so I can adjust the
vertical
> height. They look like the olive on the end of a toothpick. :-))
> The toothpicks...uh screws pass thru 1/4-inch thick acrylic with a slot
cut
> into it so the screws can slide horizontally. So I have horizontal and
> vertical freedom of travel and adjustment. A nut and washer on top of the
> plastic and under the coupling
> enable the whole toothpick to be locked in place. Brilliant, huh? The big
> flaw is that as soon as you tighten down on the lock nuts it changes the
gap
> settings. Lucky if I can
> guesstimate within +/- 5/1000ths. I cut up a Tropicana OJ jug for shims to
> help get a little more uniformity. Any suggestions---please? The sparks
are
> all off of the circular face.
> None are seen to come from the cylinder walls. I have been able to set the
> gap at
> 0.028 - 0.030. The mmc is at 0.011 uF. Not even a gap of 0.018-0.020 will
> fill a 0.022 uF mmc.
>
> Happy day,
> Ralph Zekelman
>
>
>