pic: 833- The first picture
 

Re: pic: 833- The first picture
 

Well, here it is! Few things to say first:

#1) I previously said that we were building gearboxes, and you might notice that we are using the drill gearboxes. Well we have basically scrapped the custom gearbox idea because our flange berrings were very stiff, and our tests showed that one berring drew 5 amps.

#2) This isn't the whole bot, there are going to be a few additions. (pics soon)

Re: pic: 833- The first picture
 

Why such large sprockets? Also, what size and wall thickess is your frame material?

Re: pic: 833- The first picture
 

The robot looks good. The spiral wrap you added was a good addition, really neatens it up. I just want to point out that you might want to add chain tensioners. The one on the left appears to have a bit of slack.

Re: pic: 833- The first picture
 

Thats a very good question. I hope we are planning on downsizing them, but the problem might be that we can't get smaller ones on island. For the second question, its 1"-1", 1/8" wall aluminium (welded together).

Thanks, I liked the spiral wrap too, its a lot better than the last two years where a cable actually got severed in the chains. And the tensioners was another thing I was hoping to doing. I had a plan for this and was wondering if it would be a good idea. I was thinking about putting a piece of HDPE between the chains, so the chains cut it until the rollers touch, keeping it from being cut any more. Once the rollers touch, the chain should slip on the HDPE, but still be tight from the pressure upwards. So if you or anyone else could tell me if this is a good or bad idea, that would be great.

Thanks again,
Bobby

Re: pic: 833- The first picture
 

use a peice of PVC pipe as a tensioner...run a bolt through it and bolt it to the frame