anvilfire! Power hammer Page!
Catalog of User Built Hammers
Air Spring Hammer - Built By Tony Bartol
Copyright (c) 2000
  Specs are as follows:
  • Anvil weight: 850 pounds not including base. With base and coupled mass, 2400 lbs.
  • Hammer weight: 150 pounds
  • Total weight: Somewhere around 3000 pounds. I haven't weighed it yet.
  • Speed: 270 beats per minute max.
  • Drive: Dual v-flat from 7.5 hp motor to flywheel and 6" flat belt to eccentric shaft via old military Hummer wheels. Idler pulley clutch on flat belt
  • Eccentric Stroke: Adjustable from 4 to 8 inches
  • Total stroke: From 6 to 15 inches
  • Spring: Air spring using old hydraulic cylinder and trapping air.
  • Brake: I have a wheel on the eccentric shaft to add a brake to, but so far, it looks like I may not need one.
  • Dies: Shortened 140 pound rail. 7 inch long. Will be quick change when I know what other dies I want to use.
  • Throat: 10" vertical, 14" deep.
  • Dimensions: 43 deep by 53 wide by 88 tall.
  • Adjustments:
    • Hammer position on rod is adjustable by set screw.
    • Stroke is adjustable by eccentric plug in eccentric wheel and by changing air pressure in cylinder to change stiffness.
    • Dies can be rotated in 60 degree increments now, but will be fully adjustable later.
    • Speed can be adjusted by changing motor belt sheaves.
    • Hammer guide is adjustable up and down on column if radical hammer position change is made.
      Originally, I offset the anvil to the right side so that I could work from 2 directions. Now I plan to add a second station on the left side so that it is essentially 2 independent hammers driven from the same flywheel  via independent flat belts and independent clutches. I'll add a partition between the two stations to keep flying hot stuff to a minimum. My 11 year old son asked when we were going to build him one!  
Copyright © 2000 by Jock Dempsey, DEMPSEY'S FORGE