Let me try this, picture a rectangle with one short end fixed to the vehicle and the other short end supports the platform. The platfrom and the two long sides members rotate as the lift raises and lowers by means of a strap attached to the platform powered by a motor. All 4 corners are pinned...
The lifting mechanism is more complex than I indicated, basicly it is a 4 bar linkage that helps lift the platform from ground level to several feet off the groud. I am able to figure the stress at the mounting position.
I am trying to solve for forces in a wheelchair lifting device that mounts to the rear of vehicles. The only known force I have is the wheelchair weight. I am not looking for information on computer software, just some resources on solving by free body diagrams and hand calculations.
Using the word precise was a mistake. The .002 inch tolerance on a shoulder bolt would work fine for this application. The application is for a seat rotation swivel on a power wheel chair. I was mainly concerned about the high strength steel bolt for welding.
I am designing an application where I would like to weld a shoulder bolt to a mild steel plate. I am using the bolt as a precision shaft for a rotation device. I am worried about the high strength properties of the bolt causing welding strength concerns.
