PTO Welder

[chucko]

this may help

Pulley And Belt Information Calculator

 

[barneyrb]

Guys! Don't mix apples and oranges, the ratios discussed whether 4.5:1 or 7.5: 1 are all speed to speed relationships. RPM to RPM.

Now if you want to calculate how many horsepower is required to run this generator we need to know the KILOWATT rating. Then it is a simple calculation to find required HP, using a standard rule of thumb factor.
All calculations assume that the generator is operating at FULL electric load.

For direct drive; engine to generator requires at least 1.7hp : Kilowatt (1000 watts) (this includes a power transmission loss factor).
ie; 5.5KW x1.7 = 9.35 or 5500watt needs a 10hp engine.
ie; 20KW x 1.7 = 34 or 20,000watts needs a 34hp engine.

Now if using PTO and gear box or jackshafts we need to add in an additional power loss factor of 10 to 20% for transmission losses, so to make it simple lets use 2.0 as our multiplier.
ie; 5.5KW x 2.0 = 11hp at the PTO
ie; 20KW x 2.0 = 40hp at the PTO

ok ,get r done and send pics.

Joe,

As bad as I hate to admit it.....all my calculations are wrong on this one, yep I blew it. HP is a calculation of torque which is required to turn the shaft. Tq=(hp x 5252)/rpm. The 10hp engine will produce 10hp x5252 =52520 / 3600 which is 14.59 ft pounds of torque. A 20hp tractor will provide 194.52 ft pounds (at 540 pto speed). Through a 1:7 overdrive it would require 102.13 ft pounds of torque to acomplish the work. Evidentily too much scotch or HITAS. (Head in the a** syndhrome).

 

[joe48]

Barney , thanks for the kind reply, inspite of my wife and kids opinions ,once in a while I get it right. Joe

Just by coincidence I recieved my new copy of "FARM SHOW MAGAZINE". Probably one of the best mags for the farmer, DIY'er, tinkerer etc.
A fellow wrote in about the genset he built using a 15" tire and wheel ,mounted on a frame with bearings,with a PTO shaft, 2 v-belts drive a 4" pulley on the HF ,7000watt genset. He adujsts the belts by adding air to the tire. Pretty neat.
go to Agriculture equipment, farm magazines, farm equipment, farm inventions, farm machinery, agriculture machinery and get the latest issue free. See the article in vol.32,no.3, page 37.