MOC: working power functions lift

[apemax]

here's another model i made a while ago. it a power functions lift that gos up and down. (not very well though.) this was more of a experiment than anything else. more pictures on brickshelf here: http://www.brickshelf.com/cgi-bin/gallery.cgi?f=452658 (once they become public.) sorry about the picture quality.

and a video of it working:

[Zerobricks]

Nice, but I think you need rails, so it doesnt tilt so much.

[MarcoB]

I think you only need to winch one end of the string (other end is fixed).

Or attach the string in the middle of the lift?

[apemax]

Nice, but I think you need rails, so it doesnt tilt so much.

thanks. i thought about putting rails down the sides but A: i wanted it to be easier for it to do different heights and B: i was running out of pieces.

I think you only need to winch one end of the string (other end is fixed).

Or attach the string in the middle of the lift?

i did try to even out the differences between the two sides but one side always ended up going longer than the other. both sides are run by only one motor. i guess if i put two motors in it (one for each side.) then i could even it out manually. i put two strings because i thought it would be more stable.

[Tobbe Arnesson]

Bigger drums where the cable don't have to overlap would solve it. As it is now it starts out even but one side has a larger diameter drum, probably because the cable is overlapping differently.

[apemax]

Bigger drums where the cable don't have to overlap would solve it. As it is now it starts out even but one side has a larger diameter drum, probably because the cable is overlapping differently.

ahh... your right. that makes sense. i was trying to make it as compact as possible but that would work for a bigger version. thanks.