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Seeking resonably priced source for electric motor

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ShepFL

06-17-2003 12:36:57




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I recently acquired some nice plans to build a bean sheller but need an electric motor. Specs identify need for a 115VAC electric motor at 1750 RPM. What HP is 1750 RPM? I have an old 1 HP shallow well pump motor but RPMs unknown. Thanks!
ShepFL




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Dave

06-19-2003 07:32:04




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 Re: Seeking resonably priced source for electric m in reply to ShepFL, 06-17-2003 12:36:57  
Where did you get the plans? I would like to build one myself.



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TomH

06-18-2003 18:30:52




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 Re: Seeking resonably priced source for electric m in reply to ShepFL, 06-17-2003 12:36:57  
You can probably make the motor you have work. You'll need a pulley on the motor and one on the sheller anyway, it's just a matter of picking the pulley sizes to give the proper RPM at the sheller. Of course, I have no idea how fast that would be.



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JMS/MN

06-18-2003 10:05:49




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 Re: Seeking resonably priced source for electric m in reply to ShepFL, 06-17-2003 12:36:57  
Quite often a shallow well pump, especially the C frame motors, are 3450 rpm. Usually 1/2 or 3/4 hp. You could check it with a hand held tachometer, like threshers used to. Mechanical, not electronic type of counter.



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ray

06-18-2003 07:22:44




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 Re: Seeking resonably priced source for electric m in reply to ShepFL, 06-17-2003 12:36:57  
Is the sheller a direct drive unit - no pulleys or gear reduction. You might be able to substitute a variable speed DC motor to get your desired RPM. A good "coarse indicator" of how much HP is required or being put out for that matter is to look at the diameter of the shafts transmitting torque. If the plans call for 1/2" diameter or less shafts its a low HP low torque application.

McMaster Carr online will have motors - I'd make the motor mount to accept a NEMA standard bolt pattern that way you could swap out what ever motor you come up with down the road.

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ShepFL

06-19-2003 09:00:43




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 Re: Re: Seeking resonably priced source for electr in reply to ray, 06-18-2003 07:22:44  
Ray -
The paddle shaft is 3/4 inch x 51 inch cold rolled steel. I am guessing motor is 3/4hp or 1hp. Shaft is mounted on 3/4 inch sealed ball bearing pillow blocks.

I will let you know what I found out about NEMA bolt pattern swap outs.



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DOH!

06-19-2003 09:04:38




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 Re: Re: Re: Seeking resonably priced source for el in reply to ShepFL, 06-19-2003 09:00:43  
Forgot to include that the sheller has 6 pulleys.
3 each = 12 in. v-belt pulleys
2 each = 3 in. v-belt pulleys
1 each = 2 in. v-belt pulleys



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ray

06-20-2003 12:40:01




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 Re: Re: Re: Re: Seeking resonably priced source fo in reply to DOH!, 06-19-2003 09:04:38  
Just curious

Does the sheller look like one of the hand crank clothing dryers where you squeeze the pod through and the (dried) beans pop backwards - except bigger with a hopper to linear track feeder ?

Be neat to see a picture of it. Those are large diameter pulleys is the purpose to reduce RPM at the output or are multiple things being driven off the motor?

You could build the machine and add the motor last. Figure out the torque required by handcranking the drive (picasso method). Just make provisions to fit a motor in...

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BMartin

06-18-2003 05:36:55




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 Re: Seeking resonably priced source for electric m in reply to ShepFL, 06-17-2003 12:36:57  
I bought an air compressor motor from Harbor Freight and have had good service from it.



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G Taylor

06-17-2003 14:30:26




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 Re: Seeking resonably priced source for electric m in reply to ShepFL, 06-17-2003 12:36:57  
Centrifical pumps use two pole motors for 3450 to 3520 rpm on 60hz power. A 3/4HP or larger motor requires more than just power from a 120vac 15amp U-ground receptacle. Unless you have a high dollar high efficincy motor with power factor correction capacitors in addition to the start capacitor. Then a 1HP can be made to work on short runs of heavy power cable. 1-1/2 HP motors are sometimes seen on powerwashers, air conditioners and air compressors but that's really streching a 15amp recptacle into the 20 load amp range. A 15 amp circuit is supposed to be loaded at 80% or 12.5 amps. This is where we see fires after some dumb a$$ has put a 20,25 or 30amp fuse on 14 gauge wire. Use a 15amp time delay "D" fuse. If it still blows it's pretecting you from a fire, get the idea. Or worse yet, an old 15amp breaker tripped so many times it's stuck and won't trip until 30+ amps.

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TimV

06-17-2003 13:03:50




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 Re: Seeking resonably priced source for electric m in reply to ShepFL, 06-17-2003 12:36:57  
ShepFL:
You can't tell the HP by the RPM on an electric motor any more than you could tell HP on an engine by the RPM. The two aren't directly connected without knowing more about the motor's characteristics. As far as a source, both Northern Tool and the Surplus Center carry reasonably priced electric motors, though I can't vouch for their quality--I haven't had any experience with either one's products.

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Dick2

06-17-2003 15:41:33




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 Re: Re: Seeking resonably priced source for electr in reply to TimV, 06-17-2003 13:03:50  
Four field coils will produce 1750 RPM in an electric motor. Two field coils will produce 3450 RPM. The higher the RPM, the lower the available torque to do work. HP results from the design of the field coils, stator and frame size. Granger carries a variety of motors to fit almost any application. Also check electric motor shops in your area; they may have a good used motor that is just what you are looking for.

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reuben

07-27-2003 19:35:33




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 Re: Re: Re: Seeking resonably priced source for el in reply to Dick2, 06-17-2003 15:41:33  
Could you please send copy of plans. A local electrician has some old pea shellers, I could compare plans to his machines. Plus, my father-in-law would like to build some pea shellers. Thanks!!!



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