17-02-2008 18:03

thatmorman

Re: pic: lift setup

how did you manage to gear down the cims? we used a van door, but it is extremely slow...

17-02-2008 18:51

flamefixed

Re: pic: lift setup

the shiny metal box is really a gearbox. just bought some gears (forget the number of teeth on each) but it raises it safely (with a pwm) in less 4 seconds consistently and after afew hours of precise machining on a very old crappy mill it works fine. the hardest part was just figuring out how to drive the lift up AND down.

17-02-2008 21:44

Re: pic: lift setup

looks almost like an Aim High setup

cool though

20-02-2008 03:18

thatmorman

Re: pic: lift setup

yea its pretty kewl, do you think sometime you could find the gear ratio because just guessing i thought that would have to be a gear up of like 50 to 1, we used a van door and orrigionally had a two to one ratio, but that turned out to be not very effective so we changed it to one to one and it takes about 8 seconds to get to the top, very slow... thanks

20-02-2008 07:53

flamefixed

Re: pic: lift setup

bleh, numbers haha. i know its a 16 from the CIM to a 84 on a driveshaft connected to the driven pulley of a 32 that runs the belts.

it raises to about 120-ish inches in about 2 seconds under load

20-02-2008 08:09

Qbranch

Re: pic: lift setup

Looks nice. Does your arm and ball combination weigh 30~35 lbs all together?

If so, with the right gearing and decent bearings on your arm, my calculations tell me you should only need one CIM motor. (A cim motor puts out about 245.5Wo at the shaft at 40A). To lift a 30lb weight in 2 seconds, you should need about 204W mechanical.

Shiniest gearbox i've ever seen. Looks great. Got any video of it running? 120" is a long way!

-q

p.s. What's the window motor for?

20-02-2008 16:02

flamefixed

Re: pic: lift setup

video coming soon.

it originally had only one cim on it, but it was deff straining a bit. the 8020 stock added alot of weight and i supersized some of the forklift/mounting peices.
another team member and i had 7 different forklift prototypes before choosing the final. the flex points are right where they should be, as is the very ridgid, beefy areas.
plus, we are only 90ish pounds so we figured what the heck, an extra cim wont hurt it.

the window motor shown is so we can raise and lower the forks anytime. this is for safety during the match, and adds a third way to grasp the ball.

20-02-2008 19:13

flamefixed

Re: pic: lift setup

http://video.google.com/videoplay?do...83199508&hl=en

the last stage, or few feet of movement, is not at full power. this was one of the first test runs and i wanted to baby it near the top. also, the baby-ing was done above the height needed to hurdle. the lift extends to 40 inches above the top of the rack.