HARBINGER 1
Team: HSD Group
Class: FeatherWeight
Chassis/Armour: 50 x 50mm aluminum angle
Weapon: kinetic hammer
Drive: 6 x Jaycar YG2738 gearmotors
Controller: Custom. PIC16F877 driving 25A MOSFET array
Batteries: undetermined
Combat Record: None

I don't think those motors are any good. IIRC they are not planetary gearbox and have tiny weak gears I don't think they would last very long at all.
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Steven Martin
Twisted Constructions
http://www.botbitz.com

That's correct, they have spur gears and are only 160 rpm @ 12V - even if they were run on 24V they would be far too slow. For their cost of $45, you could get a cordless drill, possibly even a hammer drill if you shop around.

Its been quite a while since a hammer bot has competed in NSW, I am looking forward to seeing what you come up with!

Yes, gratz on getting involved! Looking forward to seeing what you come up with too
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<Patrician|Away> what does your robot do, sam
<bovril> it collects data about the surrounding environment, then discards it and drives into walls

Been lurking in the shadows for a while, didn't want to come out in the open til I had something concrete. Thanks for the welcome aboard.
Thanks for heads-up on Jaycar motors. At 45 bucks a shot I expected a bit more ruggedness. So how do they break? Is it the hits from the opponents or just stress from self-generated torque? Fortunately so far I only got 2 and am doing belly-up static tests.

I really don't think they are worth event thinking about. There is some pretty enormous impact loads on the motors.

I would disassemble them and take a look at the gears.

Do you have a cordless drill you can pull apart for robot use? Look at the gears inside it and then remember that all 3 of those gears are sharing the load. And its quite common to break both plastic and metal gears......
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Steven Martin
Twisted Constructions
http://www.botbitz.com

The other issue with that motor is the output shaft - it looks like about 5 to 6 mm and is really likely to bend if you mount a wheel directly to it. The stall current is quite low compared to a drill. so it's not likely to have much pushing power compared to a dill motor.

Ok, point taken, toss the J-motors. My own people tried to tell me, ouch.

Check out this thread if you haven't already. http://robowars.org/forum/viewtopic.php?t=1576
If you buy in bulk, you can source the drill motors and gearboxes for a decent price. I'm about to bulk order a few myself in a week or two, so let me know if your interested in ordering with me to cut down on postage.
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https://www.halfdonethings.com/

Enticing, lemme think about it.
My only concern is that it'd mean massive redesign. There are size & weight considerations, I'm already dangerously close to Lightweight territory.
Got 6 motors on 3 bogies in a tricycle arrangement. Makes for onmi-directional travel, I gotta have strafe.

haha, awesome!

EDIT: no wonder the custom controller then
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<Patrician|Away> what does your robot do, sam
<bovril> it collects data about the surrounding environment, then discards it and drives into walls

One?!
There are 5 microcontrollers. One for each bogie, one for the weapon and one uber-brain.

This may be a lumbering behemoth, but I'm sure having fun.

fantastic
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<Patrician|Away> what does your robot do, sam
<bovril> it collects data about the surrounding environment, then discards it and drives into walls

You happen to know the external dimensions of these Ryobi motor-gearbox assemblies?

quote:

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Originally posted by frogbiscuit:
You happen to know the external dimensions of these Ryobi motor-gearbox assemblies?

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