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Rob Team Rotwang
Joined: 19 Jun 2004
Posts: 294
Location: Victoria
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ReBoot Drum is 135mm diameter and 165mm in length. 4.5mm thickness, the drum was made from a water pipe.
In total weigh about 2 and half Kilograms
MiniMower’s Drum is 355mm long, roughly 100mm diameter, 1.6mm thick. The drum was made from an exhaust pipe.
ReBoot will bite you with its 9.5mm Tool steel teeth 5 are positioned at 70 degree intervals, there should almos be only one that hits the robot on a full rotation. There so sharp I just cut myself on it I swear Rotwang robots are becoming more dangerous!
The plastic bag trolley wheel leaves most of the weight and energy in the outer steel pipe, the plastic also absorbs some of the shock.
We had so many of these lying around from our heavyweight, so we put them into ReBoot it has one wheel in each side of the drum, we used the lathe to machine down the ends of the Plastic wheels so it would be flush with the drum.
One of the best Polyurethane adhesive was used on ReBoot’s drum, Wurths Polyurethane. MiniMower had a cheaper brand Sikaflex polyurethane adhesive.
The original cheap bearings from the bag trolleys were replaced with proper ones for ReBoot who runs the drum at a higher RPM, although the cheap ones sufficed for MiniMower’s slower weapon speed.
The Drum spins on 16mm diameter shaft made from towel rail, the tube does not spin with the drum, it’s immobilised at both ends to give support to the front.
ReBoot’s weapon is still friction drive like MiniMower, we experimented with a faster motor but the rubber tyre expanded a bit like what happened to Keros.
We did not want to run the drum to fast because the gyroscopic forces start to conflict with the control quality. Another thing is the chance of getting a good bite on the opponent with an extremely fast drum is reduced.
Priority wise the decisions were made for reliability over a 2 day event, so low battery drain with the scooter motors seemed more desirable.
Eventually the drum should spin in both directions when flipped, extra feet are there to send the shock into the ground from the recoil of launching opponent into the air (hopefully).
The idea of the robot hitting itself does not appeal to us, this way the hit just goes from the drum through these solid legs into the arena floor
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Tue Nov 30, 2004 6:49 pm |
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