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Good work! :P You might need a bit of a wider wheelbase though!
For the belt, good old V belts do the job just fine. The 10mm ones wrap around a surprisingly small pulley (like 25-30mm) which was the problem i had with the standard 12.5mm wide type.
I'll be getting some of the urethane weldable V belt to try very soon, but if it works like the 3mm round on my beetleweights i expect it'll do an even better job :) It can be had from mcmaster if anyone in the UK can order it in for you.
Hornet was around 75cm from wheel to wheel and the disc would still cause it to ride around on one wheel turning a corner. The disc on that was only 1.8kg as well. I believe that one is closer to the 3kg mark in which case I'd highly recommend a wide wheel base otherwise it will just flip itself over again and again.
Are you going to make it invertible? As it stands the disc would be smacking the ground on it's back.
thanks, i'll make sure to expand the wheelbase. the disc weighs 2.4kg bare and was 2.7kg with all the old stuff attached. i'm undecided on whether i'll make it invertible or not, probably won't. i'll expand the wheelbase and see how it goes, if it's flipping over i'll see if i can add a magnet.
you don't want to rely on a magnet to make your robot controllable. As soon as that magnet is moved a few mm from the steel floor then it becomes useless additional weight.
It's your call Jonny if you don't make it invertible - after all, Inertia XL uses its disc to help it self-right when it's stuck on its back. But having designed the first Drumroll as non-invertible, I then had to fashion some god-awful roll hoops which didn't really work and meant I went in to half my fights worried about simply getting flipped.
If I'd just spent, say, 10 minutes tweaking the design before any materials were cut, so that the robot could run both ways up, I would've saved myself a lot of hassle later on in both the build and the arena. With Drumroll II being invertible, I only need to worry about getting flipped if there's a chance it will result in me exiting the arena. Up to you though. I don't think a magnet will help that much either; low-pressure flippers (and possibly even electric lifters) will still turn you over.
1 step forward, 2 steps back
Separated the drive modules, had a play about with wheel spacing, still unsure. Tried shortening the disc supports but they're to big to cut with my chop saw also they're far too heavy so I've decided to buy some smaller box sections. The old ones are 1.6kg ea 50 by 100 3mm thick and shall be relegated to welding practice steel.
Well I thought I better update this as stuff has been done, here are current pictures of overide:
http://i990.photobucket.com/albums/a...m/c7e55c4f.jpg
http://i990.photobucket.com/albums/a...m/e2d3b95e.jpg
It's a fp flipper with a 63 bore 50 stroke ram. Pneumatic system is 80% complete, waiting on some custom parts from Kenny and Trevor.
I'll start in omen once I decide what design will be, it's probably gonna be very similar to demon. Not in a real rush with omen, concentrating in getting overide going for Maidstone.