Force in - force out
Force in - force out
(OP)
I'm trying to develop a mechanical mechanism that will allow 3-6 lbs of force-in to get 18-21 lbs out. Size would be 5sq" X 2” I would like to construct it without using electricity, fluid, etc. Must be portable. Could flat spring material be designed to do this?





RE: Force in - force out
TTFN
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RE: Force in - force out
In-line or offset forces? Rotary? Input/output stroke lengths involved? Materials? Usage? Cost?
RE: Force in - force out
CorBlimeyLimey - In-line, Stroke=2", Materials: any, Cost:?
RE: Force in - force out
RE: Force in - force out
RE: Force in - force out
If its the input you are going to have ~0.5" ouput stroke at 24lbs with 6lbs input.
If its the output stroke you are going to need ~8" of input stroke.
how about 2 facing racks, and two twin gear shafts?
Kinda like:
CODE
------------------ Input rack
OoOo Gears (x4 force -- direction change)
----------------------------- Ouput rack
Nick
I love materials science!
RE: Force in - force out
RE: Force in - force out
In the case of an amplifier, you can have more force at the same stroke, or even a larger stroke, but you have to have an external source of additional energy, like a hydraulic pump or motor. In this case, a small pressure on a spring-loaded valve can cause massive, though proportional, amounts of force at the output, but it is technically produced by the pump, not the input force itself.
Don
Kansas City
RE: Force in - force out
RE: Force in - force out
NickE's solution could be made co-axial with a few extra characters:
[------------------
-[ OoOo ]-
-----------------------------]
RE: Force in - force out
h
h
Full article:
http://en.wikipedia.org/wiki/Crossbow
Something that's unclear is whether you want 20 lb over the entire stroke, which is different than a spring compressed 1 in with a 20 lb/in spring constant. This would give you an inch to put in a crank and rachet.
TTFN
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