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I have a synchronous motor made that way and it works great. It has two flats machined 180 degrees apart. You really need a milling machine to cut the flats. My motor started as a standard 1/2 HP 3550 RPM induction motor. For a 1750 RPM induction motor as a starting point you need to cut 4 flats spaced 90 degrees apart. There are some guidelines buried in the archives about how deep and where to make the cuts. I actually have some PDF and JPG files of the guidelines but since we can't attach files I can't post them on this board. I didn't create these files. These are files that I have collected from various sources over the years. If you supply your E-Mail address I can send them to you. Steve White Cedar Rapids, Iowa ----- Original Message ----- From: "Tedd Dillard" <tedd.dillard@xxxxxxxxx> To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx> Sent: Tuesday, February 16, 2021 8:43:03 AM Subject: Re: [TCML] sync motor Are there any comments on machining flats on the rotor of an induction motor. I understand that has been done with some success. Most of the issues I have seen are about the machining. Teddy On Tue, Feb 16, 2021, 8:56 AM Matthew Edwards <matthew.n.edwards@xxxxxxxxx> wrote: > I know this was not what you were looking for in regards to an answer but > how about winding your own? You would learn a hell of a lot in the > process... Who knows, it might spark ideas for future projects :) > > On Mon, Feb 15, 2021, 9:08 PM Steve White <steve.white1@xxxxxxxxx> wrote: > > > 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. > > > > > > _______________________________________________ > > > Tesla mailing list > > > Tesla@xxxxxxxxxxxxxxxxxx > > > https://www.pupman.com/mailman/listinfo/tesla > > > > > _______________________________________________ > > Tesla mailing list > > Tesla@xxxxxxxxxxxxxxxxxx > > https://www.pupman.com/mailman/listinfo/tesla > > > > _______________________________________________ > > Tesla mailing list > > Tesla@xxxxxxxxxxxxxxxxxx > > https://www.pupman.com/mailman/listinfo/tesla > > _______________________________________________ > > Tesla mailing list > > Tesla@xxxxxxxxxxxxxxxxxx > > https://www.pupman.com/mailman/listinfo/tesla > > > _______________________________________________ > Tesla mailing list > Tesla@xxxxxxxxxxxxxxxxxx > https://www.pupman.com/mailman/listinfo/tesla > _______________________________________________ Tesla mailing list Tesla@xxxxxxxxxxxxxxxxxx https://www.pupman.com/mailman/listinfo/tesla _______________________________________________ Tesla mailing list Tesla@xxxxxxxxxxxxxxxxxx https://www.pupman.com/mailman/listinfo/tesla