Quote:
Originally Posted by LLogan
Well, first off, the middle wheel will spin in a different direction than the two outer wheels because of the way your chain is right now. I also don't think that chain-run would work (even if you neglected the fact that the middle wheel is spinning in the opposite direction) without any sort of tensioning system. Even then it would have a higher chance of slippage because there isn't adequate chain-wrap.
In my team's past experience, we have always found it difficult to precisely drill holes into 80/20. When trying to offset the holes by 1/8th of an inch (which I am assuming your middle wheel is) the drillbit tended gravitate towards the channels of the 80/20 because it's unlike drilling into a uniformly smooth surface. However, we centered everything manually and used a drill-press.
|
I plan on running two chains from the gear box, one chain down to the middle wheel then to the from there to the front wheel, and the second to the back wheel. Since the AM shifter is made to have two sprockets inside of it.
For a tensioner I planned on making something that would mount into the slots on the 80/20 bars and/or spacing the plastic slider up with aluminum spacers and washers.
Drilling shouldn't be a problem. it should be easier to do on a Bridgeport.
Quote:
Originally Posted by Chris is me
If you weld or drill through 80/20 in this fashion you get pretty much the same weight as 1/8 wall tube and adjustability for whatever you put on top of it. Worked for Shaker this year.
It might be easier to run a Supershifter in the middle.
|
My team normally has been able to weld our robots. however we don't think that we will be able to have welding done this fall.
I know I could use Supershifters and it may be easier. However I wanted to explore other ideas.