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Brews & Views Bulletin Board Service * Brews and Views Archive 2005 * Archive through March 07, 2005 * What about this motor for motorized grain mill? < Previous Next >

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Dan Mourglea
Advanced Member
Username: Cataclysmbrewer

Post Number: 501
Registered: 03-2003
Posted on Tuesday, March 01, 2005 - 04:43 pm:   Edit Post Delete Post View Post/Check IP    Ban Poster IP (Moderator/Admin only)

Since all you yahoos out there bought all the "Beefy Bodine" low rpm motors (from http://www.sciplus.com )up before I could get the cash to buy one, what about this baby?

"3/4 HP Motor
Reliance Electric makes this 3/4 hp, 3450 rpm, 115/230 volt, 6.6/3.3 amp Duty Master® motor. It is 5-1/2" x 6-1/2" dia with a 3-1/8" x 3/8" dia shaft, and weighs slightly under 21 lbs. It is continuous duty, cw/ccw, with (8) leads plus the ground wire, and a capacitor mounted on it. Brand new. Comes with a wiring diagram and mounting instructions.
32887 3/4 HP MOTOR $49.50 / EACH"

I'm guessing 3/4HP is overkill for milling grain but it is 1/3 the price of a 1/3HP motor at the industrial sites.

Just don't go buying them all before I get one. please!
 

Paul Edwards
Advanced Member
Username: Pedwards

Post Number: 593
Registered: 03-2003
Posted on Tuesday, March 01, 2005 - 05:08 pm:   Edit Post Delete Post View Post/Check IP    Ban Poster IP (Moderator/Admin only)

How're you planning on reducing the speed?

3450 rpm is kinda high...

I use an old GE motor my dad had sitting on a shelf in the garage (this motor is older than I am, and I'm ancient). I think it's about 1/4 hp. 1700 rpm or so. I reduced the mill speed with pulleys down to under 200 rpm.

My mill is homebuilt with 4 inch diameter rollers riding on bronze bushings
 

Bill Pierce
Moderator
Username: Billpierce

Post Number: 2485
Registered: 01-2002
Posted on Tuesday, March 01, 2005 - 08:25 pm:   Edit Post Delete Post View Post/Check IP    Ban Poster IP (Moderator/Admin only)

Paul's right; you're going to need a rather large pulley to reduce the speed to something reasonable (under 300 rpm) for a mill. Most common AC motors are 1750 rpm, so they're easier to reduce. Myself, I'd look around the salvage yards. Old electric motors are relatively common. Or just buy a corded variable speed drill.
 

Patrick C.
Intermediate Member
Username: Patrickc

Post Number: 289
Registered: 01-2001
Posted on Tuesday, March 01, 2005 - 08:51 pm:   Edit Post Delete Post View Post/Check IP    Ban Poster IP (Moderator/Admin only)

I'd wait for another gear motor to turn up on A.S.S., and use the drill for now.
 

Tom Gardner
Advanced Member
Username: Tom

Post Number: 570
Registered: 01-2001
Posted on Wednesday, March 02, 2005 - 12:25 am:   Edit Post Delete Post View Post/Check IP    Ban Poster IP (Moderator/Admin only)

What's the recommended RPM and torque for a grain mill? I've heard RPM 100-200 and torque > 30 lb-ft? TIA, Tom
P.S. I have a Schmidling MaltMill
 

Andrew Bales
Member
Username: Bales

Post Number: 244
Registered: 10-2002
Posted on Wednesday, March 02, 2005 - 02:21 am:   Edit Post Delete Post View Post/Check IP    Ban Poster IP (Moderator/Admin only)

Having just done some research - a washing machine or dryer motor (1/3hp 1725 rpms) should do just fine.

Get the 12" and 1.5" pulleys [sleaves is the real term] (and a 3/8" to 1/2" sleeve to use the pulley on SchMill) from Grainger.com. Get a 4V 50" belt.

http://www.byo.com/departments/1123.html
 

Kevin LaDue
Junior Member
Username: Keladue

Post Number: 42
Registered: 12-2003
Posted on Wednesday, March 02, 2005 - 03:16 am:   Edit Post Delete Post View Post/Check IP    Ban Poster IP (Moderator/Admin only)

Patrick C.
Try the ebay store site of Friesen electric and look at the gear motor section. They have an assortment of motors in the 150 rpm range for sale.
 

Dan Mourglea
Advanced Member
Username: Cataclysmbrewer

Post Number: 502
Registered: 03-2003
Posted on Wednesday, March 02, 2005 - 03:56 am:   Edit Post Delete Post View Post/Check IP    Ban Poster IP (Moderator/Admin only)

I was figuring on a 12" and a 2" pulley to reduce the rpms by a factor of 6 (am I thinking correctly here?) and that would put it under 600rpm. IIRC, Dan Listermann has posted on a couple occassions that he uses a speed in that neighborhood with no problems (please correct me if I am wrong Dan).
EDIT
PS It's a Philmill II that I am intending to motorize. My old (10+ years old) B&D electric drill doesn't have enough torque to start the mill with grain in the hopper and I have to feed it in slowly as not to choke it down--especially with wheat.

(Message edited by cataclysmbrewer on March 02, 2005)
 

Catt22
New Member
Username: Catt22

Post Number: 17
Registered: 12-2000
Posted on Wednesday, March 02, 2005 - 05:54 am:   Edit Post Delete Post View Post/Check IP    Ban Poster IP (Moderator/Admin only)

Dan M.

I have a Philmill I powered by a cheap ($19 from Harbor Frieght) 3/8" corded variable speed drill. The drill is chucked to a cheap right angle drive adapter which is also a 2:1 gear reduction. Between the variable drill speed and the reduction gearing I can run the mill at about any speed desired and the load on the drill motor is not at all excessive IMHO. I am very pleased with this setup. I thought about setting the mill up with a motor, sheaves etc, but this seemed to be a less expensive and simpler approach. The drill can still be used as a drill when desired and the same for the right angle drive which I already had in my tool chest. Hope this info is of some help to you.
 

Dan Listermann
Advanced Member
Username: Listermann

Post Number: 913
Registered: 03-2004
Posted on Wednesday, March 02, 2005 - 01:41 pm:   Edit Post Delete Post View Post/Check IP    Ban Poster IP (Moderator/Admin only)

3450 motors are fine if you reduce them. With the Philmill II, I found that the "terminal throughput" occurs around 800 rpm. That is the grist can't fall by gravity into the gap at faster speeds. The quality of the grist is just fine. I have built three mills using 7" and 1.75" sheaves. They work fine. You will find that it crushes better than 9.5 pounds per minute.

Dan Listermann
 

Ken Anderson
Advanced Member
Username: Ken75

Post Number: 732
Registered: 11-2002
Posted on Wednesday, March 02, 2005 - 02:57 pm:   Edit Post Delete Post View Post/Check IP    Ban Poster IP (Moderator/Admin only)

Speaking of dryers, I salvaged the big pulleys and belt off of my old one before hauling it to the junk yard. If you scavenge the motor, get the pulleys too.
 

Chad D.
Intermediate Member
Username: Icehouse

Post Number: 359
Registered: 02-2003
Posted on Wednesday, March 02, 2005 - 03:12 pm:   Edit Post Delete Post View Post/Check IP    Ban Poster IP (Moderator/Admin only)

I use an 18v cordless drill with my philmill. Wheat is a little tough to do, and dextrin malt can be a real b*tch, but I always get through it.