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HSD Group - NSW
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frogbiscuit



Joined: 26 Aug 2010
Posts: 82
Location: Wollongong


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HSD Group - NSW

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

Post Sun May 08, 2011 3:41 pm 
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marto
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Joined: 08 Jul 2004
Posts: 5459
Location: Brisbane, QLD


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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

Post Sun May 08, 2011 4:13 pm 
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Nick
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Joined: 16 Jun 2004
Posts: 11802
Location: Sydney, NSW


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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!

Post Sun May 08, 2011 4:27 pm 
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Jaemus
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Joined: 01 Apr 2009
Posts: 2674
Location: NSW


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Yes, gratz on getting involved! Looking forward to seeing what you come up with too Smile
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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

Post Sun May 08, 2011 6:52 pm 
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frogbiscuit



Joined: 26 Aug 2010
Posts: 82
Location: Wollongong


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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.

Post Sun May 08, 2011 10:19 pm 
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marto
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Joined: 08 Jul 2004
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Location: Brisbane, QLD


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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

Post Mon May 09, 2011 1:03 am 
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Nick
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Joined: 16 Jun 2004
Posts: 11802
Location: Sydney, NSW


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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.

Post Mon May 09, 2011 4:44 am 
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frogbiscuit



Joined: 26 Aug 2010
Posts: 82
Location: Wollongong


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

Post Mon May 09, 2011 5:21 am 
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Knightrous
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Joined: 15 Jun 2004
Posts: 8509
Location: NSW


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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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Post Mon May 09, 2011 8:21 am 
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frogbiscuit



Joined: 26 Aug 2010
Posts: 82
Location: Wollongong


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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.

Post Mon May 09, 2011 8:35 am 
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Jaemus
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Joined: 01 Apr 2009
Posts: 2674
Location: NSW


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haha, awesome!

EDIT: no wonder the custom controller then Smile
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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

Post Mon May 09, 2011 8:38 am 
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frogbiscuit



Joined: 26 Aug 2010
Posts: 82
Location: Wollongong


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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.

Post Mon May 09, 2011 8:42 am 
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Jaemus
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Joined: 01 Apr 2009
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Location: NSW


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fantastic Smile
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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

Post Mon May 09, 2011 9:03 am 
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frogbiscuit



Joined: 26 Aug 2010
Posts: 82
Location: Wollongong


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

Post Mon May 09, 2011 9:27 am 
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Knightrous
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Joined: 15 Jun 2004
Posts: 8509
Location: NSW


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


Team Rolling Thunder have a Solidworks CAD drawing that should be pretty close to the same dimension.

http://www.teamrollingthunder.com/Harborfreight12v.SLDPRT
http://www.teamrollingthunder.com/Harborfreight12v.IGS
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Post Mon May 09, 2011 10:04 am 
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