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Old 06-09-2009, 02:01 PM   #1
Sawdustguy
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Default Motor for Grain Mill

Is a motor with 86 rpm and 21 inch-lbs of torque enough for a grain mill?

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Old 06-09-2009, 03:48 PM   #2
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Quote:
Is a motor with 86 rpm and 21 inch-lbs of torque enough for a grain mill?
My motor's torque is at the low limit for any mill.
The mill motor has 16 in-lb of running torque at 94 RPM.
The starting torque is just enough to start with grain between the rollers at my gap setting.
I measured the required starting torque for my mill, just under 30 in-lb.

Mill in action.





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Old 06-09-2009, 05:26 PM   #3
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ClaudiusB what type of mill do you have? Roller lengths/diameter.

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Old 06-09-2009, 05:28 PM   #4
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My motor's torque is at the low limit for any mill.
Hows that thing do with wheat and rye?
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Old 06-09-2009, 08:27 PM   #5
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ClaudiusB what type of mill do you have? Roller lengths/diameter.
The mill base was made by Automatic, a commercial mill company.
6" long x 1-1/2" DIA rollers, and gap is .035".

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Hows that thing do with wheat and rye?
No problem with wheat, never used rye.



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Old 06-09-2009, 08:52 PM   #6
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Thanks! Good to know that you get get by with ~30 inch pounds. I had read 40 was the minimum. I've been searching on ebay for something that will work. I may try to find an ice cream maker at a yard sale. What about windshield wiper motors?

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Old 06-10-2009, 06:39 AM   #7
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With the 1/3 hp Baldor motor of 1725 rpm with a worn drive output shaft mounted to a 90 degree worm drive gearbox as a single manufactured unit of 60:1 reduction i'm at 565 in/lbs TQ at 28.75 rpm's. Geared up by 3.111 for 89.44 rpm's this drops TQ to 181.6 in/lbs or 30.26 in/lbs per inch of roller length. This turning 2" rollers on a MM3-2.0 mill with 6" long 3 roller mill. This would be the same as a 1 1/2" roller mill turning at 119.25 rpm's if you match the surface speed of the rollers in inches per minute. Fast enough for me without making flour with gearing up to a 1/2" diameter jackshaft with sprockets supported with two pillow bearings and a 28:9 tooth gearing. The other end of the jackshaft direct coupled to the mills 1/2" input shaft drive allowing for no side loading on the drive bushing with a LoveJoy alignment coupling for the mills drive.
I think this will make a nice build project just needing a hopper and a short 6" long chute under the mill for the bucket not wanting to throw grain all over the floor but aimed straight down into 5 gallon bucket.
My plan is to mount the top and bottom of the mill on 1/8" to 1/4" thick aluminum plates to keep the mills end plates in alignment as well the end play in a solid fixed position. Mount this top plate under a table and the lower chute to the bottom plate is in my plans. Build it solid without the mills end plates flexing should allow for a lot longer bushing life besides cleaner running of the bushings by holding tight roller end clearances keeping grain dust and debris at a minimum reaching the bushings.

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Old 06-10-2009, 06:54 PM   #8
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Quote:
What about windshield wiper motors?
conpewter never used one.
I don't like the idea having to use a large power supply besides the motor.
Those motors draw over 8 Amps under load.
AC gear motors are more convenient, less current.

I checked with the German brewing community, they use windshield wiper motors for mills, and mash mixers.

BrewBeemer as soon you feel better start building your mill, we all like to see it.


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Old 06-10-2009, 07:13 PM   #9
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Windshield wiper motors seem like they would be too small for crushing. But I'm willing to try since I can pull bunches of them out of cars for a couple of dollars each...

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Old 06-11-2009, 10:05 AM   #10
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Quote:
Originally Posted by ClaudiusB View Post
conpewter never used one.
I don't like the idea having to use a large power supply besides the motor.
Those motors draw over 8 Amps under load.
AC gear motors are more convenient, less current.

I checked with the German brewing community, they use windshield wiper motors for mills, and mash mixers.

BrewBeemer as soon you feel better start building your mill, we all like to see it.


Cheers,
ClaudiusB
I sure as hell wish I could move around and do some work. Even lifting the MM3-2.0 in the box off the floor will hurt me for days again. What are we talking a 25 pound item and it is over my backs limit with me back on Percocets 5 times a day again. I'm trying to get off the addiction of them as i'm hooked at the moment and when I do something stupid like lift or bend i'm delayed for weeks again on the healing. The surgeon does not want to repair what he as fixed again. Was told a wheelchair could be in my future if I don't give the back time to heal up and stop being so stubborn and thick headed. Might be the German in me? Tell me about the frustration i'm going thru besides the pain 24/7, this is why i'm up again at 2 AM in pain and stiff waiting for the Percocet to kick in again. A simple high seat and handlebar stunt bike geared super low, three blocks at 5 mph wiped me out for a week. I thought this would be a short test
on the lower spine. Big mistake. Very limited life at 56 and it sucks as I have plans and ideas besides purchased equipment. Hell i'll be happy to have my mill, motor and parts half layed together on the floor for a picture would be progress for me and this will be with needed lifting help. Perks, no bier either, rather have bier no Perks. No mixing. Thanks Claudius B. for kicking me in the butt as I need this while on the mend.
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