28-01-2011 10:11

sdcantrell56

Re: pic: What is this?

Is there any bearing material between the pieces of 80/20? Without that I foresee a lot of mechanical inefficiency in the system. Other than that it looks like you are doing a good job.

28-01-2011 10:12

buildmaster5000

Re: pic: What is this?

An elevator made out of 80/20 and #25 run inside the 80/20 to raise/lower it?

28-01-2011 14:47

Mr_I

Re: pic: What is this?

YES! We discovered that #35 chain fits almost perfectly between adjacent pieces of 8020. Add to that the fact that the steel-to-aluminum friction is very low, and you've got a very good thing.
We mounted two verticle pieces of 8020 to the drive train frame, and ran the chain down the slot to a "elevator car" that rides on two pieces of 8020 about 12" long. (There's about 1/16" gap between the car and the rails, so there's little side-to-side drag. ) The car is attached to the chain at the top and bottom, and the chain loops out the bottom via sprockets back to the top. Add a Barbie to drive the sprocket, and we've got a low friction high strength elevator!

28-01-2011 17:53

IceStorm

Re: pic: What is this?

Were thinking of doing something extremely similar to this. As this is only are 2nd year would you mind answering a few questions.

What size/type 8020 did you use?

How do you mount the sprockets to the end of the 8020?

Thanks.

28-01-2011 23:25

Mr_I

Re: pic: What is this?

Quote:

Originally Posted by IceStorm What size/type 8020 did you use?

29-01-2011 09:38

Nick Lawrence

Re: pic: What is this?

Interesting. Looks like things are coming along.

How 'bout a quick vacuum of the robot frame?

-Nick

30-01-2011 05:00

Hellfeier675

Re: pic: What is this?

Good idea! My only warning is that we used 80/20 in the past to build a forklift (2008) and unless everything is 100% lined up, you're going to start building up a lot of friction. Given that we had quite a bit more on the end of the forklift though which contributed to the problem, I'd still watch out for friction, it's a killer.

30-01-2011 07:38

JamesCH95

Re: pic: What is this?

Quote:

Originally Posted by Mr_I YES! We discovered that #35 chain fits almost perfectly between adjacent pieces of 8020. Add to that the fact that the steel-to-aluminum friction is very low, and you've got a very good thing. We mounted two verticle pieces of 8020 to the drive train frame, and ran the chain down the slot to a "elevator car" that rides on two pieces of 8020 about 12" long. (There's about 1/16" gap between the car and the rails, so there's little side-to-side drag. ) The car is attached to the chain at the top and bottom, and the chain loops out the bottom via sprockets back to the top. Add a Barbie to drive the sprocket, and we've got a low friction high strength elevator!

30-01-2011 08:58

IceStorm

Re: pic: What is this?

Another question. Do you have a chain on each side of the lift, and if so are both sides powered or does one side just free slide?

30-01-2011 12:37

LondonBoy29

Re: pic: What is this?

What motor are you planning to use. My team is planning to use either a fisher price or window for our motor, and we can't decide.