Screw jack MA and VR
It would be great if somebody can explain/give me the formula for the screw jack mech. adv. and the vel. ratio. I must be in brain lock or something but I'm trying to differentiate the two and their formulas. What I have is MA = 2pi r/pitch and for VR =2pi r/L where L is displacement of load. To me the pitch and L are the same. Any help is appreciated....
vr is the distance travelled by L[-handle] which is a raduis,used to get circumference. distanced travelled .divided by the pitch the distance the jack moves up, MA= vr times efficiency
Thanks for the clarity. So the 2pi r is the circumferential distance of the handle and the height traveled is the pitch. The MA is just the load lifted divided by the effort to lift it. I guess its just a ratio thing and then the two provide the efficiency without the friction forces involved. Thanks