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Beetleweight resource page
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Nick
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Joined: 16 Jun 2004
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Location: Sydney, NSW


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Very true, 2 or 3mm shafts seems the standard; I was planning to add an 8mm front support bearing and press a pulley with an 8mm hub onto the motor shaft. Its not ideal, but I wanted a smaller diameter motor without a rototing case to make the bot more compact. Perhaps I will just experiment with a 2820 motor I already have...

Post Mon Dec 06, 2010 12:28 pm 
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Glen
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i think that could work pretty well as long as the bearing as really smooth so it doesnt load up the motor badly. was thinking of doing something really similar for the 1000rpm drive motors Smile

Post Mon Dec 06, 2010 12:30 pm 
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Nick
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It might be possible to extract the original front bearing so that aligning the new bearing isn't quite so critical - it might be possible on some motors if you can get the rear end bell off and extract the rotor.

Post Mon Dec 06, 2010 12:40 pm 
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Knightrous
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Does anyone have some specifications on these 1000RPM gearmotors that all the beetles seem to be running? Stall Current? Torque?
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Post Thu Dec 09, 2010 1:27 pm 
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Jaemus
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ill have a look at one when i get home, theyre a mabuchi 300 something, should be able to extrapolate some specs from the motor specs
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Post Thu Dec 09, 2010 2:48 pm 
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Valen
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i believe angus posted some numbers on them a while ago
currents at least
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Post Thu Dec 09, 2010 8:29 pm 
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Jaemus
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i got home and realised i dont have any of them at my new place
will have to wait till i go get them
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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 Fri Dec 10, 2010 9:17 am 
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Philip
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Joined: 18 Jun 2004
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Ebay has the 12v 1000rpm gear motors at a good price again. http://cgi.ebay.com.au/2-x-12V-1000RPM-Mini-Torque-Gear-Box-Motor-Hobby-DC-NEW-/190480763299?pt=AU_B_I_Electrical_Test_Equipment&hash=item2c5989c9a3 This listing ends 15th January.
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Post Fri Dec 17, 2010 4:48 am 
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Daniel
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Ships from Hong Kong. Something else to put on my shopping list.

Post Fri Dec 17, 2010 11:15 am 
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Jaemus
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Very cheap. I grabbed two pairs

even though i dont really need them Razz
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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 Fri Dec 17, 2010 12:02 pm 
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Philip
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How much distance does it take to get your 1000 rpm motor powered beetles up to full speed?
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Post Sat Dec 18, 2010 2:58 pm 
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kato



Joined: 11 Dec 2010
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Location: 4505


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BTW, what exactly is full speed for a reasonably nimble ant / beetle / feather? Not the fastest, not the slowest, just a relatively agile one? As I'm going to be up for some pulleys and belts I need to know what ratios to buy. Thanks.

Post Sun Jan 16, 2011 10:47 am 
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dyrodium
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Joined: 24 Aug 2004
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This might answer both questions re: beetleweights, keep in mind the 4wd bot had 0 traction (as seen by the drifting) yet it managed a fairly impressive box rush. The 1000rpm gearmotors seem to work very well on 4s lipo and 50mm or so dia wheels. Smile
http://www.youtube.com/watch?v=X6yHd0AOXng
Derp - forgot link.

For featherweights, cordless drills at 650-800rpm and 100mm wheels usually results in a pretty nifty robot.
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Post Sun Jan 16, 2011 9:28 pm 
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seanet1310



Joined: 08 Nov 2006
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Location: Adelaide


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Anyone know the rough kinda stall currents of the 1000rpm motors?


Also has anyone tried any other gear combinations such as the 300rpm from the same place and look almost the same
http://cgi.ebay.com.au/2-X-12V-DC-300RPM-Gear-Box-Motors-Model-Car-Boat-/190501979542?pt=AU_Toys_Hobbies_Radio_Controlled_Vehicles&hash=item2c5acd8596#ht_4059wt_912
for quality?
Although motor looks different it is ebay.
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Post Tue Mar 15, 2011 6:36 pm 
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marto
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6 - 10A I think it was. I also think its mentioned somewhere in the ESC hacking thread as I tested it before trying the beetle ESCs.

Steve
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Post Tue Mar 15, 2011 6:37 pm 
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