If you would "pull-up"...

[MattB703]

The team I was on in 2000 (Team 49) also used the 2 van door motors to lift our bot in 2000.

We were under the impression that worm drives cannot be backdriven so we were a little disapointed to see that when we turned the power off after lifting, our robot slowly settled back to the ramp. We ended up having to make a possitive clamping mechanism.

MattB

[Ken Leung]

Originally Posted by MattB703

The team I was on in 2000 (Team 49) also used the 2 van door motors to lift our bot in 2000.

We were under the impression that worm drives cannot be backdriven so we were a little disapointed to see that when we turned the power off after lifting, our robot slowly settled back to the ramp. We ended up having to make a possitive clamping mechanism.

MattB

I can confirm that the Van door motor do back drive. Actually, it would make sense that if these motors are used in real van doors, it is designed to be back-drivable so that whoever get trapped when the van door closes will not be crushed by the force.

So, if you are using the van door motor to lift your bot, you may want to design a locking mechanism. That is exactly what we did at 2000 when we used them to power a big arm that lift the robot body off the ground. Otherwise it will slip back down.

[Aignam]

Fisher Price motors, I believe, can handle the task.

[maxgebhardt]

what we've got in the works for this year is a 2" bore pneumatic tube on a double solenoid. of course, its not neccisarily a motor, but it's what we're counting on.