Post Number: 501
|Posted on Tuesday, March 01, 2005 - 04:43 pm: ||
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!
Post Number: 593
|Posted on Tuesday, March 01, 2005 - 05:08 pm: ||
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
Post Number: 2485
|Posted on Tuesday, March 01, 2005 - 08:25 pm: ||
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.
Post Number: 289
|Posted on Tuesday, March 01, 2005 - 08:51 pm: ||
I'd wait for another gear motor to turn up on A.S.S., and use the drill for now.
Post Number: 570
|Posted on Wednesday, March 02, 2005 - 12:25 am: ||
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
Post Number: 244
|Posted on Wednesday, March 02, 2005 - 02:21 am: ||
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.
Post Number: 42
|Posted on Wednesday, March 02, 2005 - 03:16 am: ||
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.
Post Number: 502
|Posted on Wednesday, March 02, 2005 - 03:56 am: ||
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).
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)
Post Number: 17
|Posted on Wednesday, March 02, 2005 - 05:54 am: ||
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.
Post Number: 913
|Posted on Wednesday, March 02, 2005 - 01:41 pm: ||
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.
Post Number: 732
|Posted on Wednesday, March 02, 2005 - 02:57 pm: ||
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.
Post Number: 359
|Posted on Wednesday, March 02, 2005 - 03:12 pm: ||
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.