Recent content by sporty

unrest, may i know from my design, how to calculate the speed in choosing a motor can u teach me to calculate the speed using mechnical advantage?? how to calculated speed in varies position? especislly at higest speed position...can you show me the formula? 1 rev turn of screw will move 1.75mm...

No,Actually this is not my design, i just use this as basic analysis on this 2 type of equation..Because i am doubt why the answer will be different. actually in the beginning the symmetric scissor linkage with middle pivot is supprted by 2 arm linkage in 'X' and the force..abd in overall free...

[PLAIN]http://www.fileupyours.com/view/303536/tis%20is.bmp This is what i means..thanks and one more is mechnaical advantage in your picture for 1 of linkage the applied weight only W/2 so the Mechanical advantage is (W/2)/F screw or W/Fscrew? thanks again

What i means is in this link, the calculation didn't show the reaction force in the middle connection, and too the final answer for force from that forum is different to us which we using static analysis The link, http://www.engineersedge.com/mechani...issor-lift.htm Mechanical advantage...

http://www.engineersedge.com/mechanics_machines/scissor-lift.htm" Thanks unrest, the static analysis i have already did it last month but currently i found that some other equation show in above forum... so i am doubt, which one is correct because, both will produce different answer...

This is my scissor linkage...can u teach me how to calculate the mechanical advantage for it...Just show me one for me to understanding..thanks. http://filesup.net/R6P3SQJEKQ83/toy.bmp.html"

Unrest, thanks is it what you means here, we do not need any electronic to do this, we just simply use a motor with a control to supply a dc current to it, reverse the current than it will turn other direction. can u teach me how to use mechanical advantage to calculate speed? is it like...

thanks, if assume 1.8 cm/s along lifting, this is correct? Because torque reduce along lifting, but speed should be increase, then how to get the spped? for rpm calculation it is base on 2 factor, one is lead or pitch of screw, and one is linear speed...but this 2 is constant then the rpm at...

Thanks a lot unrest, I have no idea in choosing a motor in my product, because i do not well know the motor. If I am goin to lift up my scissor lift, i found the highest torque is at lowest position, So the 10Nm is the torque required from my calculation. At the same time, the scissor lift...

Can anyone tell me . if I am going to lift up a scissor lift using power screw drive by a motor, the highest torque is during lowest position before lifting so this is a maximum torque and the speed RPM is the speed i wish to lift scissor up with a turn equal to a lead of the screw? So during...

thanks a lot Danger, have a nice dreams..

thanks a lot t oyour reply danger, you make me more understand on skipping follower, but is it too troublsome for a person to screw the bolt to follow and unsrew it frequently? or is it have other mechanism to substitude the screw bolt to lock the thread? Now i am more understand to the linear...

Finally you are back Danger,thanks a lot.. i need a lot of your help.. so u mean it really complicated if using rack and pinion. I also worried that the gear tooth will wear easily if the load support about 70 to 80 kg. I really have no idea in linear actuator, i wish to know the mechanism and...

if using linear actuator, I think we need a cell to supplied electric sources, and the electric source need to recharge, and will increase the overall weight of wheelchair, i hope to use manual type, is it supportable or affordable if i am using ratchet mechanism to drive pinion and rack ,with...

thanks for your information. if have anymore idea, welcome to sharing here.Thanks