Joined: 16 Jun 2004
Posts: 11802
Location: Sydney, NSW
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...
Mon Dec 06, 2010 12:28 pm
Glen Experienced Roboteer
Joined: 16 Jun 2004
Posts: 9481
Location: Where you least expect
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
Mon Dec 06, 2010 12:30 pm
Nick Experienced Roboteer
Joined: 16 Jun 2004
Posts: 11802
Location: Sydney, NSW
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.
Mon Dec 06, 2010 12:40 pm
Knightrous Site Admin
Joined: 15 Jun 2004
Posts: 8511
Location: NSW
Does anyone have some specifications on these 1000RPM gearmotors that all the beetles seem to be running? Stall Current? Torque? _________________ https://www.halfdonethings.com/
Thu Dec 09, 2010 1:27 pm
Jaemus Experienced Roboteer
Joined: 01 Apr 2009
Posts: 2674
Location: NSW
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 _________________ <Patrician|Away> what does your robot do, sam
<bovril> it collects data about the surrounding environment, then discards it and drives into walls
Thu Dec 09, 2010 2:48 pm
Valen Experienced Roboteer
Joined: 07 Jul 2004
Posts: 4436
Location: Sydney
i believe angus posted some numbers on them a while ago
currents at least _________________ Mechanical engineers build weapons, civil engineers build targets
Thu Dec 09, 2010 8:29 pm
Jaemus Experienced Roboteer
Joined: 01 Apr 2009
Posts: 2674
Location: NSW
i got home and realised i dont have any of them at my new place
will have to wait till i go get them _________________ <Patrician|Away> what does your robot do, sam
<bovril> it collects data about the surrounding environment, then discards it and drives into walls
Fri Dec 10, 2010 9:17 am
Philip Experienced Roboteer
Joined: 18 Jun 2004
Posts: 3842
Location: Queensland near Brisbane
Joined: 30 Aug 2005
Posts: 2729
Location: Gold Coast
Ships from Hong Kong. Something else to put on my shopping list.
Fri Dec 17, 2010 11:15 am
Jaemus Experienced Roboteer
Joined: 01 Apr 2009
Posts: 2674
Location: NSW
Very cheap. I grabbed two pairs
even though i dont really need them _________________ <Patrician|Away> what does your robot do, sam
<bovril> it collects data about the surrounding environment, then discards it and drives into walls
Fri Dec 17, 2010 12:02 pm
Philip Experienced Roboteer
Joined: 18 Jun 2004
Posts: 3842
Location: Queensland near Brisbane
How much distance does it take to get your 1000 rpm motor powered beetles up to full speed? _________________ So even the rain that falls isn't actually going to fill our dams and our river systems
Sat Dec 18, 2010 2:58 pm
kato
Joined: 11 Dec 2010
Posts: 92
Location: 4505
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.
Sun Jan 16, 2011 10:47 am
dyrodium Experienced Roboteer
Joined: 24 Aug 2004
Posts: 6476
Location: Sydney
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.
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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