How to Calculate Pressure Exerted by C in a Lever and Fulcrum Configuration?
- Thread starter john101
- Start date
-
- Tags
- Calculation Fulcrum Lever
Join the discussion
Registration is free. Ask a follow-up in this thread, or start your own.
200 replies · 27K views
john101
- 196
- 47
Ok, I think I got the problem I was having now.
The tube is welded to the crosspiece bars only.
No U piece.
I get what you mean re the lifting assembly at the other end.
Rough idea:
Showing 2" edge of tube with 1" thick bar with hole inserted with additions either side, shaft through them and case wall and piston etc.
The tube is welded to the crosspiece bars only.
No U piece.
I get what you mean re the lifting assembly at the other end.
Rough idea:
Showing 2" edge of tube with 1" thick bar with hole inserted with additions either side, shaft through them and case wall and piston etc.
Science Advisor
Gold Member
- 1,532
- 462
That is a good start but now the challenge is finding a way to get the same strong reinforcement and load transfer connection between the axle plate and the arm that is now at the top end of the arms.
I am turning a number of variations for that connection running through my mind right now. I need to know what range of bars and plate you have or have access to that I can work with, including the width of the 1" bar you have. Once I have that information I will work on coming up with some connection suggestions.
I am turning a number of variations for that connection running through my mind right now. I need to know what range of bars and plate you have or have access to that I can work with, including the width of the 1" bar you have. Once I have that information I will work on coming up with some connection suggestions.
john101
- 196
- 47
I have a number of the 1" which are actually 1 3/16 x 2 9/16 x 7 3/4 " that fit very nicely in the 2x3 tube. they are all pre-drilled for the shaft so I need to use them. Then I have 1/4", 3/16" plate.
Science Advisor
Gold Member
- 1,532
- 462
I think I have found a possible solution for connecting the tubing to the axle bar using your available materials, but, I need to know the distance between the inside edges of the two holes in the 7 3/4 long axle bar(s) and the length from the the inside edge of the axle hole to the opposite end of the bar.
john101
- 196
- 47
This is a drawing of the bar.
The lower hole is where the axle goes (c).
The upper hole is serrated and gripped on to a serrated torsion bar suspension on the 'rail car' by clamping it on with a bolt through the small hole.
Can you describe in more detail which dimensions you are after?
note. after writing the above I reread your post and I think you mean between the two bars in the two arms. ?
The lower hole is where the axle goes (c).
The upper hole is serrated and gripped on to a serrated torsion bar suspension on the 'rail car' by clamping it on with a bolt through the small hole.
Can you describe in more detail which dimensions you are after?
note. after writing the above I reread your post and I think you mean between the two bars in the two arms. ?
john101
- 196
- 47
the distance from the top edge of the bottom hole to the bottom edge of the top hole is 3 3/16".
the distance from the top edge of the bottom hole to the top end of the bar is 5 1/2".
the distance from the top edge of the bottom hole to the top end of the bar is 5 1/2".
john101
- 196
- 47
my idea is to cut the lower part off a couple of bars and use them as the spacers.
john101
- 196
- 47
Science Advisor
Gold Member
- 1,532
- 462
Attached is a suggested bottom connection design. The stacked 1/4" & 3/16" strips welded to the outside face of the axle bar are there to bring that to the 1 5/8" thickness required for a close side to side fit inside the 3 x 2 tubing for a strong welding attachment from the tube to the bar. I would have placed the 1/4" plate on one side of the bar and the 3/16' plate on the other but that will affect the inside 1" spacer clearance between the bar and body of the unit. Unfortunately, the top hole in the bar forced me to shorten the weld slot on the bar side without the added spacers.
I have also added reinforcing strips to the outside of the 2" faces of the tubing in the bottom region where there has been material removed for the welding slots in the 3" faces.
I made a composite using part of one of your figures to reduce my drafting time and the time of my response.
Review this layout and let me know what you think and any questions you have.
I have also added reinforcing strips to the outside of the 2" faces of the tubing in the bottom region where there has been material removed for the welding slots in the 3" faces.
I made a composite using part of one of your figures to reduce my drafting time and the time of my response.
Review this layout and let me know what you think and any questions you have.
Last edited:
john101
- 196
- 47
Ok, that's a neat setup. I'm sure I understand all of it. I can do that. At the moment I'm finishing off the cross piece and starting preparing the arms. I'll post pics later.
john101
- 196
- 47
current: car battery for visual scale.
yet to add strengthening strips.
Cut crosspiece inserts too short to have them protrude beyond outer strips.
Arms not cut to length. Don't want to make mistake again of precutting to find mistake later.
found I've cut the c shaft too short. ie can't add third outer layer. I think I was miscalculating/mismeasuring for the inner strips.
yet to add strengthening strips.
Cut crosspiece inserts too short to have them protrude beyond outer strips.
Arms not cut to length. Don't want to make mistake again of precutting to find mistake later.
found I've cut the c shaft too short. ie can't add third outer layer. I think I was miscalculating/mismeasuring for the inner strips.
john101
- 196
- 47
I mean this layer pointed to in red. The rod reaches to the red dotted line.
john101
- 196
- 47
Yes I will. That's good. Thank you.