RE: Re: [TCML] SRSG Update. Very cool pictures!

["Phil Tuck (hvtesla)" <phil@xxxxxxxxxxx>]

Hello.
You are right to be " VERY VERY VERY concerned about (that)" Because a 600
rpm motor with 0.25 inch electrodes will give you a dwell of 2273.64uS on a
7 inch disc, according to JAVATC. 
You really *do* need a faster motor, preferably a 3600rpm motor. Get an
induction motor and modify it yourself or get to know someone with a mill.
Building a propeller gap is an easy way to get a low dwell time as it is
easier to make a 12 inch long blade rather than a 12 inch diameter disc.

Regards
Phil

www.hvtesla.com

-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of Andrew Robinson
Sent: 16 November 2009 19:07
To: Tesla Coil Mailing List
Subject: Re: Re: [TCML] SRSG Update. Very cool pictures!

To be honest that is what we have been VERY VERY VERY concerned about 
since stage one. This was the only sync motor I could get my hands on 
currently. I am terrified about the dwell time for this reason exactly...

Its a 600 rpm sync motor. BPS = (rpm x rotary electrodes)/60 for 60 Hz 
... (600 x 12)/60 = 120 bps.

Since the motor rpm is so low and the electrodes are 1/4 inch, as I 
said, I'm terrified about the dwell time. After some initial tests we'll 
see how it does and if all else fails its super easy to modify the motor 
mounts and re-machine them for a different motor. The disc diameter was 
8 inches but had to be reduced last night to 7 inches for material 
considerations. I'm crossing my fingers. I don't want to have to 
re-machine everything and I don't want to have to buy a new sync 
motor... but I fear I will have to very soon.
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