Power Hammer Ram speed Help! Please

Johnny Warner

Johnny Warner

Joined
May 21, 2007
Messages
530
I recently accquired a Dienelt & Eisenhardt Power Hammer that I want to configure with a 2 cycle per second strike rate with the ram contacting the billet. I have a 5Hp Baldor motor turning 1775 RPM with a 8" pulley middle belt drive that will connect to the 16" Wheel drive on the power hammer. My question is what size pulley do I need to attach to the motor and middle belt drive that will drive the intermediate pulley that will attach to the 16" drive wheel on the power hammer? Any and all help is deeply appreciated. I thought I had it figure out with a 1.5" drive on the motor, but I am not sure and need your expert advice. Thanks for taking the tiem and effort for any thoughts and ideas!

Johnny Warner
 
Johnny, ya might check over at the IForgeIron site . They have a powerhammer section.
Another option is call Sid Sudemeir. You'll get the straight scoop from him.
 
I got the formula out in the shop to figure BPM or RPM. I'll post it here a little later if no
one else does.

My 25 lb Little Giant runs at 475 blows per minute, that's about 8 blows per second.
My 100 pounder runs at 280 BPM. Your 2 blows per second will be running slow!
 
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I was looking at my Dupont/Fairbanks chart and they range from 4oobpm for the 25# to 175 bpm for the 500#. Big range there.
 
Need a few more numbers and I can figure it for you. How many revolutions of the 16" pulley on the hammer does it take for 1 strike of the hammer? What is the diameter of the pulley that drives the 16" one. From my understanding, the "to-be-determined" size pulley on the drive shaft turns an 8" pulley. Is there no smaller pulley beside it that will in turn drive the 16" or is it 8" as well? Sorry if that makes no sense.
 
Maybe I need to rethink how many blows per minute. What is the recommended blows per minute and what size motor pulley will it take to achieve the recommended speed? If I use a 2" motor pulley to a 8" pulley (intermediate Pulley) and the 8" drives the 16" clutch pulley will this give me a roughly 220 rpm rotation of the ram? One revolution of the 16" wheel should give me one stroke of ram to the dies.
 
aktoklat said:
If I use a 2" motor pulley to a 8" pulley (intermediate Pulley) and the 8" drives the 16" clutch pulley will this give me a roughly 220 rpm rotation of the ram? One revolution of the 16" wheel should give me one stroke of ram to the dies.
Click to expand...

Yes you are correct, if the clutch isn't slipping. If the motor drives an 8" pulley and an 8" pulley drives the 16", there is no need for an intermediate pulley as far as gearing goes. You would get the same results running straight from the 2" on the motor to the 16".
 
(Motor pulley dia.) divided by (Hammer clutch dia.) X (Motor RPM) = (Shaft RPM)

What size hammer? Smaller should run faster and larger should run slower.
Speeds of my Little Giants above are about right, much faster and they get out of
timing. Much slower, they don't hit hard enough.
 
I checked my 25 and is running 475 Blows per minute, I edited my first post.

2.75" motor pulley, 10" clutch and a 1725 RPM motor.

This little hammer screams, sounds like a machine gun :)
 
The hammer is a 50 lb hammer, however the previous owner said it pounds more like a 100lb Power Hammer. The freight weight when delivered was 3100 lbs which inculded a 200 lb + pallet (6" thick lumber x 48" square) also it came with two exta sets of 6"x3" dies. My thinking is this hammer wieghs in the neighborhood of 2200 lbs and stands slightly over 7' in height. Thanks Don and Clemsonreeder for the information. Now one last question and I will be out of everyone's hair. If I mount a 2" diameter wheel directly to the motor and run the drive belt from the motor to the Clutch pulley, where can I obtain a 2" diameter by 4" wide pulley for a 1.125" O.D. shaft? I really appreciate the responces and help from all, it really helped! Thanks and more thanks for the much needed information I have received. Johnny
 
I run a double V-belt pulley on the motor and two V-belts, on both my hammers.
Works great! Got them from MSC.
I have no idea where to get the pulleys for a wide flat belt.
 
One more thing; 2" pulley is still going to put you over 400 BPM. Little fast for a 50.
If I were you, I'd be looking for the smallest pulley for your motor.
 
aktoklat,if your going to forge Damascus from my OWN view you would want that hammer to beat as hard and fast as it can to take advantage of the heat and to set the weld.I don't pre-heat my dies and forge weld a minimum of 37 layer's at a time without any flux,my old 100 dollar hammer does a fantastic job and like Don say's it sounds like a machine gun when the clutch is fully engaged,when i want to do some profileing i just back off the treadle and the clutch decreases the rpm-bpm.Individual preference is what it boil's down to,attached a photo so you can see my configuration,if you decide to go with a wide pulley and can't find one shoot me a PM,might be able to fix you up.
Steve
3 x 4 pulley on 1725 1 1/2horse
 
clemsonreeder, my math says 443.75 shaft RPM.
I've always used it, but my equation above might be wrong?
 
Don, Justin & Steve thank you for the ideas and suggestions. I have some decisions to make and ya'll made it simple and clear! Thanks. Johnny
 
I hope Mr. Warner doesn't mind me asking a question in his post. If I was going to build a 15/20# power/junk yard hammer, what kind of stroke length should I be looking at?
 
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