Fulcrum question

   / Fulcrum question #11  
I am thinking of making a manual press, for a non tractor related idea.

My thinking is that if I use a 48" long lever, with the pivot point within 1" from the end and pressure point about 8" from same end, leaving 40" of actual lever, and with me weighing 170lbs, how much pressure would that create? It will be pressing on an object 3/8" in diameter (.375") or at least very close to that.

The PRESSURE will be about 10331 PSI based on your 3/8" target.
 
   / Fulcrum question #12  
I think I understand now. With 1st class levers, I would always just compare one side of the fulcrum to the other to get the ratio. With 2nd class levers, I was trying to compare the distance from the Fulcrum to the Load with the distance from the Load to the Effort. As far as I can tell, this will give the same answer as your method, except when the load is right in the middle. Your method works for all classes of levers as far as I understand. I will have to switch.

Thank you Sir!

no problem
 
   / Fulcrum question #13  
   / Fulcrum question #14  
scanned an old physics book of mine, dont know if this will turn out right, info about a class 2 lever-fulcrum.
 

Attachments

  • 2012-04-18 18.44.35rs.jpg
    2012-04-18 18.44.35rs.jpg
    153.3 KB · Views: 103
   / Fulcrum question #15  
and a scan with a class 1 lever fulcrum
 

Attachments

  • 2012-04-18 18.45.17rs.jpg
    2012-04-18 18.45.17rs.jpg
    113.3 KB · Views: 119
   / Fulcrum question #16  
clicking on the above thumbnails brings them to an almost readable view.
 

Tractor & Equipment Auctions

71065 (A49346)
71065 (A49346)
2001 HEIL PNEUMATIC CEMENT TRAILER (A51222)
2001 HEIL...
F-500 POWER PUMP 500HP TRIPLEX POWERED BY 3412 CATERPILLAR ENGINE (A50854)
F-500 POWER PUMP...
1985 International X Con Semi (A50514)
1985 International...
2014 KENWORTH T800 MIXER TRUCK (A50854)
2014 KENWORTH T800...
INGERSOLL RAND G25 GENERATOR (A50854)
INGERSOLL RAND G25...
 
Top