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Re: [TCML] sync motor

Its pretty surprising what can be done with hand tools such as a file if you are slow and deliberate. Since the balance is critical, especially with the 3600 RPM motor, that's why I suggest a milling machine to get the accuracy of depth and position. If a milling machine is not available, another possibility is to use a vertical belt sander with a coarse grit sanding belt.

Steve White
Cedar Rapids, Iowa

----- Original Message -----
From: "Lux, Jim" <jim@xxxxxxxxxxxxx>
To: tesla@xxxxxxxxxx
Sent: Tuesday, February 16, 2021 9:49:15 AM
Subject: Re: [TCML] sync motor

On 2/16/21 7:37 AM, Tedd Dillard wrote:
> Thank you Steve I also have that information and am planning on building
> one that way. I was looking for feedback on performance as I have also
> heard about difficulties. I am glad to hear from someone that has actual
> satisfactory experience with the design.
> Thanks
> Teddy
> On Tue, Feb 16, 2021, 10:27 AM Steve White <steve.white1@xxxxxxxxx> wrote:
>> 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

There was a LOT of discussion about this on the list, say, 10 years ago?

There are some folks who actually did the flats *by hand* with a file, 
and it worked.

googling "site:pupman.com flats sync" turns up some hits..





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