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From: "Jim Wilkins" <muratlanne@gmail.com>
Newsgroups: rec.crafts.metalworking
Subject: Re: rod-mill project - "mains" electric motor advice
Date: Mon, 14 Apr 2025 16:55:51 -0400
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"Richard Smith"  wrote in message news:m1v7r6369f.fsf@void.com...

It would do me a lot of good to get this project done, so I am not
going to sweat this too much - in the absence of being shown the way,
I will likely get the single-phase 0.75kW motor, do the belts and see
this thing running a.s.a.p.
In a lifetime, sometimes it's better to get that next step done and
know all about what you'd do next when it comes around again.

Regards, Rich S
---------------------------

I built and ran a 1/2 HP electric sawmill before building the 6.5 HP gas 
one. Bandsaws that make a wide cut have a problem not seen as much with 
narrower cuts, the teeth need a minimum pressure to cut into the wood and it 
adds up with length until reaching the point where the pressure to make a 
dulling blade cut forces its center back until the front edge loses tension 
and deflects (buckles) up or down. I tried coarser, wider, thicker blades 
and discovered that they cracked bending around the wheels. More blade 
tension might have helped but the blade tensioner wasn't adequate for this 
misuse.

I didn't expect those problems and spent a lot of effort understanding and 
adjusting for them. It's a good example of the need for debugging a small 
(less expensive) prototype before moving to the full sized machine. The 1/2 
HP bandsaw is back in its original upright configuration.

https://sawmillcreek.org/showthread.php?118177-Bandsaw-blade-flexing-while-resawing
" It takes a fair amount of development of personal skill to learn how to 
get the best results from a bandsaw."

My windmill rock tumbler needed tweaking too.

Single to three phase converters were once a lively topic here.
https://www.practicalmachinist.com/forum/threads/fitch-williams-converter-design-balancing-instructions.101882/
https://groups.io/g/felderownersgroup/attachment/105688/1/Converter%20Doc%20with%20Pictures.pdf

https://www.capacitorindustries.com/wp-content/uploads/Run-and-Start-Capacitors.pdf?
"Capacitors with ratings above 70 microfarad (uF) are starting capacitors. 
Run capacitors are designed for continuous duty, and are energized the 
entire time the motor is running."

An oscilloscope and clamp-on AC ammeter are very helpful if not essential. 
Standard practice with high voltage is to work with only one hand. I like to 
see the power plug lying on the bench rather than depending on a switch.

There's a crude and simple way to use a three phase motor that I decided not 
to post. Just hinting that it exists.