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Tractor Talk Discussion Forum

OT - Hammermill horsepower

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two mile

05-03-2007 18:44:37




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We have an old hammermill that hasn't been used for 20+ years. It is JD and came with the '45 JD A that we have. The belt is rotted off of it, but otherwise doesn't look too bad mechanically. Our question is what kind of horsepower does this require. We were considering converting it to electric. We have an old 7-1/2 Hp. motor that isn't being used on anything else. Would this be enough? We only need enough capacity for a few fair animals. Our local feed mill was torn down this past winter.

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rrlund

05-04-2007 17:45:13




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 Re: OT - Hammermill horsepower in reply to two mile, 05-03-2007 18:44:37  
One thing to do is make sure you are running it FAST enough. I've seen people try to run them direct with a PTO instead of a belt. 540 rpms just ain't enough.



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fixerupper

05-04-2007 06:14:19




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 Re: OT - Hammermill horsepower in reply to two mile, 05-03-2007 18:44:37  
Dad used to pull a 10 inch JD hammermill with a flat belt off a '51 A and it seems like the tractor had some power to spare. If I remember right, the mill could be fed faster than the fan could suck it away from underneath, and the tractor was still hanging in there well. The A had a powerblock but can't really say what the horsepower was. A 12 or 14 inch would pull a lot harder than the 10 did. Jim

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two mile

05-04-2007 05:12:42




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 Re: OT - Hammermill horsepower in reply to two mile, 05-03-2007 18:44:37  
Thanks for all of the input. We would likely be setting this up in our grainery as a permanent unit. As to size, the screens are about 12-14" wide. Haven't measured them yet. The pulley that is on the outfit has grooves on it like a serpintine belt. I know that the ratios will change so I appreciate the speed info. Will also likely set up some sort of clutching mechanism to aid in starting. Again thanks for all your replies.

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gene bender

05-04-2007 03:45:47




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 Re: OT - Hammermill horsepower in reply to two mile, 05-03-2007 18:44:37  
First thing is the 7 1/2 electric wont start the mill there is too much wt for an electric motor that size. Second you need to run the grinder around 2200rpm. You didnt say what size the mill is. If its one of those little 4in jobs you have a chance although small.What material do you plan on grinding and how fine. Dont worry about a flywheel as if you can get the mill up to speed it will act as a flywheel.

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Mike Van

05-04-2007 03:58:20




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 Re: OT - Hammermill horsepower in reply to gene bender, 05-04-2007 03:45:47  
Gene, I run a bandsaw mill with a 10 hp, it starts two 40 lb. 24" dia wheels, as soon as you push the start button. Saws 30" dia logs. I'm pretty sure the 7 1'2 will start that hammermill, I don't think he'll be able to shovel the corn right to it though.



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gene bender

05-05-2007 15:59:09




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 Re: OT - Hammermill horsepower in reply to Mike Van, 05-04-2007 03:58:20  
The rotor part of the hammermill will weigh a lot more than your wt unless its a little 4in but he says the screens are a lot wider than 4in and you are using 10hp capicitator start maybe even 3 phase correct so he has to have some good power to get it started now if he can build a tightener to clutch the belt some it would help. Also going to need the correct motor. Ground thousands of bushels with the B ON A 9IN mill and you had to slip the clutch to start rotation but then did just fine too bad we didnt have the bigger pulley on the B as we could have had more capicity per hr.

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Mike Van

05-04-2007 02:38:23




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 Re: OT - Hammermill horsepower in reply to two mile, 05-03-2007 18:44:37  
I ran one [for ear corn] with a Farmall A, it was slow. Bought a MH 33 and it was a lot better. The 7 1/2 might work, but I think you'll want a flywheel of sorts, to store that energy for when the ears hit the screen. Some type of multiple belt drive too, one V belt won't get the job done.



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JOHN HARMON

05-03-2007 20:39:27




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 Re: OT - Hammermill horsepower in reply to two mile, 05-03-2007 18:44:37  
I would say that if you did not crowd it the 7 1/2 HP Electric Motor will do the Job. Are you going to run a flat Belt or convert it to V-Belts? Dad ran ours with either the MM U or the AC WD45. Both handled it well. Shoveler could not keep up.



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Don L C

05-03-2007 20:11:46




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 Re: OT - Hammermill horsepower in reply to two mile, 05-03-2007 18:44:37  
Your John Deere A must of had about 30 HP on the pully.....



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msb

05-03-2007 19:56:21




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 Re: OT - Hammermill horsepower in reply to two mile, 05-03-2007 18:44:37  
How fast can you shovel?



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old

05-03-2007 19:07:41




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 Re: OT - Hammermill horsepower in reply to two mile, 05-03-2007 18:44:37  
The big of an electic motor would probably do a good job on it. I know its some thing like for every 2 or 3 HP gas equals 1HP electic



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buickanddeere

05-04-2007 20:18:18




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 Re: OT - Hammermill horsepower in reply to old, 05-03-2007 19:07:41  
Brief peak power of an electric motor can be 1.75 to 2.75 times it's rated power. The electric will often handle a brief overload that would stall a combustion engine. Constant overload? The thermal protection should trip or the smoke will leak out of the motor wires. Continious power, 7.5 HP is 7.5HP no matter if it's gaoline four stroke, two stroke, diesel, gas turbine, steam turbine and oses on a tread mill.

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