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kato
Joined: 11 Dec 2010
Posts: 92
Location: 4505
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Well, one or two things don't add up yet. To get four wheel drive I am going to buy some double sided timing belts, otherwise the convolutions in the belt will destroy it and rob so much power. Also, the 82 mm wheels don't give enough clearance for armour when running with a 68 mm diameter motor! So some 100 mm scooter wheels are on the way.
... but there's always plan B...
I'm using some of the ridiculous oversize kiddy car wheels with four 24 volt Canon motors. They're driving a pinion gear reducing by a 1:~6 ratio onto a 240 mm wheel, so if my calcs are right (and there is a risk with that) the no-load speed of the wheel periphery will be about 18 kph with my 2500 rpm motor. Of course, there is friction galore to take into account, so it'll be slower than that, but the speed figures previously given seemed to indicate from 15 to 20 kph was nippy enough. For a weapon, I was thinking of using one of the big motors running a mulcher / chipper blade. The mulcher isn't using it much Gotta fit it under the weight limit though, and I don't know how well the big plastic tyres will last against a nasty spinner or a flame weapon. I don't think I'll put terribly much effort into this one, just in case.
The Canon motor shafts are 4 mm, the bore of the pinion gears is 5 mm. A 40 mm strip of "V" can wound around the motor shaft makes an excellent collar to increase the shaft size. I just put a grub screw on each side and tightened them both: They run quite true.
Ripped some of the motors out of the Pulsar. The aircon radiator fan motor is only 35 mm thick but 95 mm across. It fair screams along. I think it'll make a fine spinning weapon motor, powering a ~3kg DD turntable platter. Maybe harvey can have some teeth after all.
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Wed Feb 16, 2011 11:04 pm |
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