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Old 02-14-2008, 06:14 AM   #1
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Default Motorizing my Barley Crusher

Looking at McMaster-Carr's' part# 6142K72 AC electric gear motor. 115 volt, 150 RPM. They say it has 5lb's torque. Is that enough to effectively crush my malt? I plan on using sheaves and belt and building a mobile, motorized grain mill. I just want to pick the right motor the first time.
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Old 02-14-2008, 02:52 PM   #2
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I don't think that will have enough torque but I could be wrong. You could get a different motor with a higher rpm and gear it down.

I run my mill with a corded drill and I've seen several others with this setup. From a little research i've found that cordless drills have somewhere around 450 in-lbs of torque (so corded would be the same or more). 450 in-lbs may be overkill for most mills (I don't have a barley crusher) but I just don't think that 5 in-lbs is going to be enough. Consider how much that really is, that's a 5 inch bar with 1 lb on the end of it, not a lot of torque at all.


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Old 02-14-2008, 03:13 PM   #3
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How many amps is the motor? Or how much horsepower?

I'd think 5 ft./lbs of torque might do. But most people use a small sheave 1/2" on a motor that runs approx. 1850 rpm and a large one 10" on the grain mill to acheive approx. 300 rpm on the grain mill.

So you'd have to have the larger sheave on the motor and the smaller on the grain mill to get your RPM up to 300.

If it were me I rather go with the conventional setup rather than try to reinvent the wheel.

here's an example of one from BYO using a 1/3 hP 1750 rpm motor to drive a grain mill at 185-200 RPM.

http://www.byo.com/departments/1123.html
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Old 02-14-2008, 05:55 PM   #4
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I think you are confusing the two common ways of powering a mill.

Many use a medium size electric motor and pair of sheaves or pulleys, with a v-belt. This 'gears down' the out put speed from around 1700 to whatever you are aiming for; generally around 200-250rpms. using this speed reduction system also increases the usable torque of the motor, like any transmission system does.

Others use an AC gearmotor to direct drive the mill by way of a flexible coupling. The speed reduction system is built into the motor by way of a gear reduction system on the output end of the motor. These are rated by rpm and out put torque although they also are commonly rated by hp, too.

I have seen recommendations of 1/3 hp and around 50 in/lbs of torque, although pinning this down exactly is open to variables such as how long the mill rollers are and what type of power is being used to run the mill.

Bodine gearmotors are popular due to the variety and availability.

I used their website to plan my mill station.
http://www.bodine-electric.com/Asp/P....asp?Context=8

I was interested in the 42R-E Parallel series. I think the 48R-F series is a bit of overkill.

I was aiming for a 115 rpm motor, with 68 in/lbs., #0651, but chickened out on bidding, then found the 0650 @170rpm and 45 in/lbs., new, for a buy it now price and jumped. It is a very substantial motor and I believe it will work fine although I have to buy my mill yet. It is much more substantial than a cordless drill... I have powered it and it is impressive. It does not require an additional capacitor, as many do. I still need to build a stand and wire it, but it's been ambition-killing cold around here for quite a while...

http://www.bodine-electric.com/Asp/P...AC%20Gearmotor

Many are currently searching for gear motors, so competition is tighter than it used to be but I got a new Bodine for $59. List = $312.

IIRC, the BC is a short roller mill and since less grain is going thru it at one time, than say, a longer roller type, like C&S and Monster, you should be able to get away with a proportionally smaller amount of torque than those other mills.



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Old 02-14-2008, 06:10 PM   #5
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My Bodine motor is rated in Nm at 6.2 which is 4.57 ft/lbs. I have it hooked up to a Crankandstein 3 roller mill. This runs at about 100 rpm. It will destroy anything except rocks and steel.
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Old 02-14-2008, 07:54 PM   #6
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Just to clarify he means 5 in-lbs. If you go to McMaster and look up the part you'll see that in it's rating. I definitely agree that a motor with 5 ft-lbs of torque would work great (at the right rpm)
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Old 10-15-2008, 11:56 PM   #7
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Dan's Motorized Grain Mill
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Old 03-30-2015, 01:58 PM   #8
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Did you end up building your mill with eh 42R-E motor? How does it work? Any suggestions or hindsight style insights? Trying to build out a Barelycrusher for my local homebrew shop.
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Old 04-10-2015, 07:14 PM   #9
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I just picked up this motor off of eBay. I'm hoping that it will workout for motorizing my barley crusher. I need to get a 3/4" to 3/8" lovejoy coupling (I believe the Barley crusher is 3/8").

This was the description of the motor:
SCOTT DC GEAR MOTOR
PM FIELD OPERATION VOLTAGE 115 DC 2.7 AMPS
MODEL MGA - 02525
RPM 230
INSULATION CLASS 105 A - A1
MOUNT IS GBX
SHAFT 3/4" X WITH 1/4" SPLINE
Motor length 10 1/4" 5" diameter
Shaft 1 5/8" long 3/4 " diameter
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Old 05-20-2015, 09:14 AM   #10
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Is the barleycrusher 3/8 shaft for the love joy? I like to order mine today


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