for our investigatory project, we are making something which we call %26quot;removable wheels.%26quot; we will add a frame (made of metal) where you can put the legs of tables..on top of the wheels. clamps will be used on four sides to hold the legs of the tables in place. that way, the table would move. it's like a portable push cart. the table becomes the push cart itself. you just add the wheels. (i know, not exactly a very good project, but we don't have time to change anymore) but there's one more thing. we're told to put in a %26quot;shock absorber%26quot;. this shock absorber uses the principles of hydraulics and this is where im having a problem. http://i845.photobucket.com/albums/ab13/kim523/ip2.jpg that's a temporary sketch i made in paint. the lines around the thing is actually a spring, in case you're wondering. the spring is welded to the metal at the bottom part, not the top part. is that correct? or is there something missing? or do you have any comments about it? it would really help me so much. if you didn't understand what i just said... please ask. i'd gladly re-explain it :)
Is the sketch for my project correct?
Edit
I cut and pasted your reference with the following result -
%26quot;We did not find results for: http://i845.photobucket.com/albums/ab13/鈥?/a> Try the suggestions below or type a new query above.%26quot; But
when I first posted this answer the proper self-directing link did appear. So - -
I see no %26quot;hydraulics%26quot; here. A set of coil springs will act as suitable shock absorbers for the table all by themselves. (Hydraulic %26quot;shock absorbers%26quot; on cars are really there to mostly dampen out the cyclic bounce of the springs in the suspension system. That will be unnecessary here unless you intend to put your roller table on the road.)
As is it currently described, unless the swivel pin has a retainer on top (like a locking ring) to keep it in the mounting hole, the wheel will fall out if the entire assembly is lifted. If there is a retainer , there is no need to tack weld the coil spring. If there is not a retainer, you can tack weld both ends of the spring so that it will also act as a retainer, but that will create a dis-assembly problem later. Also if you tack both ends, the wheels will be very limited in the amount of swivel.
(Unless the wheels are already ball bearing swivel casters.) I would prefer a removable retainer to snap onto a groove near the top of the pivot pin and do not weld the spring at all.
If the project is only conceptual, it looks OK as I noted above. If it is design- build, you will have to be careful with the spring design so that they are not too stiff or too weak. You will have to estimate the anticipated weight of the table and also the contents. The springs will need to be ground flat on top and bottom. The shaft mounting block will need to be counter bored or the table legs hollow to allow for unimpeeded upward movement of the shaft when the spring compresses. The bottom of the block will need a short round protrusion ( a boss) slightly less than the inside diameter of the spring to act as a lateral retainer for the spring.
Is the sketch for my project correct?
You have a problem there. A hydraulic shock absorber is made up of a piston within a cylinder which forces fluid through a small hole, not something the amateur engineer can easily rustle up. I suggest a cut down bicycle pump as the best bet. The fluid needs to be forced out to and returned from a reservoir, but there is nothing against one reservoir feeding 4 shock absorbers. Good luck.
