mechanical advantage IQ
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Lumberjack
Banned
I like it. I like to see what all combos I can get with a fixed number of pulleys.
Most of them aint practical, but it is fun to figure out.
Carl
Most of them aint practical, but it is fun to figure out.
Carl
Lumberjack
Banned
Here is a site that Tom posted over on another message board. It shows how to easily have a two MA setup in one. I like it, good score Tom.
I will probably change my big MA setup over to it. You just run a loop through the double pullies and put the bight on a single pulley. The on the tail you put a friction hitch on both sides, so you pull both and have 3:1 or have a 6:1 if you just pull one side.
Carl
I will probably change my big MA setup over to it. You just run a loop through the double pullies and put the bight on a single pulley. The on the tail you put a friction hitch on both sides, so you pull both and have 3:1 or have a 6:1 if you just pull one side.
Carl
i see a 4/1 system piggybacked (multiplied) on a 4/1 system; for a potential of 16/1.
Degraded by the pulley friction (larger sheaves and bearings minimizing this; bearings by less friction than bushings; larger sheaves taking more leverage over the friction of the bearing/bushing assembly that rides the axle), and the less direct pulling angles of each, rope stretch and rubbing etc. IMLHO, 15 or 20 degrees angle from straight pull will be more reduction in efficiency than most pulleys we would use.
It all gives up distance for power. If you pull a 3/1 3' @100# pull and concentrate/funnel that into 1' it will be ~300 ft.lbs. of force. If you 'dilute' that 3' of effort X 100# Pull over 12'; you will only get ~25 foot pounds of power over that 12' distance, but 4x fast. It must always equal out/balance by the laws, even the theory of relativity has an equals sign in the middle of it; for nature demands that every act be in balance, for the world to be in balance.
So the energy, never appears magically or disapears; just is changed/re-organized by a 'machine'. A gearbox, lever, wedge, 10 speed, ramp, pulley system, screw etc. all demand that as power increases (1st gear) you have less speed; but in high gear, you have less power, but more speed. The speed x power will always = the sources power x speed (minus friction etc.). An engine is like a human body, or even a JP's; it is a finite source of energy; with a powerband of good working efficiency somehwere in it's graph. Using machines we can keep the source in it's powerband of efficiency, and elicit speed or power to suit our needs.
Understanding these things can let you know when you can have faith in a rig to a job or not, also as stated to make sure you don't overload an anchor (making it the load!!! Switching everything), pulley, hardware etc. The change in power potential must reciprocate the change in speed, so that 3 x increase in power X 1/3rd speed will always equal 1 etc. As the Law of Conservation of Energy commands, nothing is lost; even plant energy concentrated and locked in the ground for millions of years must follow that rule; thus giving petroleum fuels explosive power, as all that saved up energy is suddenly re-leased!
Orrrrrrrrrrrrrrrr something like that!
-
:alien:
Degraded by the pulley friction (larger sheaves and bearings minimizing this; bearings by less friction than bushings; larger sheaves taking more leverage over the friction of the bearing/bushing assembly that rides the axle), and the less direct pulling angles of each, rope stretch and rubbing etc. IMLHO, 15 or 20 degrees angle from straight pull will be more reduction in efficiency than most pulleys we would use.
It all gives up distance for power. If you pull a 3/1 3' @100# pull and concentrate/funnel that into 1' it will be ~300 ft.lbs. of force. If you 'dilute' that 3' of effort X 100# Pull over 12'; you will only get ~25 foot pounds of power over that 12' distance, but 4x fast. It must always equal out/balance by the laws, even the theory of relativity has an equals sign in the middle of it; for nature demands that every act be in balance, for the world to be in balance.
So the energy, never appears magically or disapears; just is changed/re-organized by a 'machine'. A gearbox, lever, wedge, 10 speed, ramp, pulley system, screw etc. all demand that as power increases (1st gear) you have less speed; but in high gear, you have less power, but more speed. The speed x power will always = the sources power x speed (minus friction etc.). An engine is like a human body, or even a JP's; it is a finite source of energy; with a powerband of good working efficiency somehwere in it's graph. Using machines we can keep the source in it's powerband of efficiency, and elicit speed or power to suit our needs.
Understanding these things can let you know when you can have faith in a rig to a job or not, also as stated to make sure you don't overload an anchor (making it the load!!! Switching everything), pulley, hardware etc. The change in power potential must reciprocate the change in speed, so that 3 x increase in power X 1/3rd speed will always equal 1 etc. As the Law of Conservation of Energy commands, nothing is lost; even plant energy concentrated and locked in the ground for millions of years must follow that rule; thus giving petroleum fuels explosive power, as all that saved up energy is suddenly re-leased!
Orrrrrrrrrrrrrrrr something like that!
-
:alien:
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