My method was similar but a little riskier. I timed it with the 4 flying electrodes in place. I used one of those U-shaped optical transmitter/receivers that allows the tungsten electrode to pass through it. The clearances are tight.
Steve White
Cedar Rapids, Iowa
----- Original Message -----
From: "shaun" <snoggle@xxxxxxxxxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Monday, February 15, 2021 12:41:26 PM
Subject: Re: [TCML] sync motor
I have two holes in the rotor (for 120 bps). On one side of the spinning
rotor I point a sk2035a photo transistor through the hole on the rotor and
on the other side the detector. When it spins sends a pulse to the scope
which is triggering on line to a old transformer the other channel has the
rotor pulse. Overlap the two channels and align. Works very well and is fun.
Later on.
-----Original Message-----
From: Tesla [mailto:tesla-bounces@xxxxxxxxxx] On Behalf Of Gary Gaspar
Sent: February 15, 2021 12:49 PM
To: Tesla Coil Mailing List
Subject: Re: [TCML] sync motor
Shuan yes it is a hard thing now to find. Can give problems finding the
sweet spot. My comment had fun with strobe light & the SRSG with the sweet
spot.
On Sun, Feb 14, 2021 at 10:19 AM shaun <snoggle@xxxxxxxxxxxxxx> wrote:
I have read the archives for days looking for leads on cheep sync motors,
always day or several years too late to get in on the action. I have been
looking at the oriental motors that are synchronous but don't lock at the
same phase each time, so I would have to use a 1800 rpm with 4 contacts
for
120 bpm so where ever it locked would be in sync, assuming 90 degree
locks.
I have purchased from ebay, 2 of the teletype motors and they work very
well, but the ones that are there now, are way too pricey.
Anyone have any to sell, or a tip on where to get one. I followed Dr
Resonants leads on motors he talked about, but just another dead end. I
don't really want to machine one up, but I guess that is a option.
Thanks all.
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