hello gentlemen users of the forum, to handle industrial machinery would like to build a large and long steel bar crolling a crow bar, you could help mold him with advice thanks

Click image for larger version. 

Name:	fulcrum.jpg 
Views:	449 
Size:	13.2 KB 
ID:	1629
Click image for larger version. 

Name:	figure15.jpg 
Views:	414 
Size:	28.5 KB 
ID:	1630
Click image for larger version. 

Name:	man-and-lever.jpg 
Views:	661 
Size:	47.7 KB 
ID:	1631
Click image for larger version. 

Name:	Roller-Crowbar-Hl-RC-Series.jpg 
Views:	790 
Size:	43.9 KB 
ID:	1632
Click image for larger version. 

Name:	721-0-Rollenbrechstange.jpg 
Views:	528 
Size:	33.7 KB 
ID:	1633