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Re: Wheels
12/20/2013 11:15:17 AM
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@csquared0: You only need one; See Honda HOT Drive System

I've seen that before -- I would LOVE one of these!!!

Maybe for my next robot...

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Wheels
12/19/2013 6:49:39 PM
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"Unless anyone offers a better suggestion, I'm looking at 4-inch-diameter FXA156 (4202) transwheels from the folks at Kornylak Corporation."

You only need one;

See Honda HOT Drive System

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Re: What does "Torque: 0.78Kg-cm (rated load)" mean?
10/31/2013 10:16:20 AM
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@Steam Kid: Ref your query on comparing motors. Change to a common system of measurements...

It's amazing how it's only when you come to want to do something that you realize how little you know LOL  Thanks for the advice -- I'm learning so much -- it's great :-)

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Re: What does "Torque: 0.78Kg-cm (rated load)" mean?
10/31/2013 7:53:20 AM
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@ Max. Ref your query on comparing motors. Change to a common system of measurements, I prefer metric in this case and N.m, Using Newtons work of Force= Mass x Acceleration (F=ma) convert 0.78kg to Newtons by muliplying by g (accelation due to gravity 9.81 m/s/s) this gives 7.65N-cm. Then convert cm to m by dividing by 100, 0.0765N-m then multiply by 1000 to get mN, hence 76.5mN-m, so motor 2 is better by 2.5%. I've been racking my brains to remember the formulae to calculate the speed/accelaration to weight section, but it currently escapes me.

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Re: using magnets for feedback
10/28/2013 12:49:29 PM
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@salbayeng: OK stumbled on this while looking at something un-related...

Wonderful -- thanks for the info -- I'm now contemplating furiously :-)

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Re: using magnets for feedback
10/28/2013 3:22:30 AM
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OK stumbled on this while looking at something un-related: it's an encoder compatible with those little 30mm gearmotors:

Robotshop has omni wheels (\$4 to \$10) and motor brackets , so you can build the whole thing from parts.

encoder :  RB-Lyn-217   \$31   (400ppr optical)

Motor :  RB-Hsi-05      \$22

Bracket :  MMT-02   \$8

(Note the 400PPR will be too high a countrate for the simple interrupt type scheme I suggested earlier.)

-------------

Ahh here we go

http://www.robotshop.com/en/pololu-gearmotor-encoder-2274.html

\$36 gets you motor + encoder (they have a couple of different speed options), this is a a nice planetry gearbox as well.

It's only a 1" motor , 4mm shaft, maybe too small?

----------------------

Note the three wheel base you were looking at is back in stock on 11 november anyway.

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Re:Robot Movement feedback
10/27/2013 3:17:18 PM
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Interesting yes, but not so profitable.  The company (Imetrix) I built that sensor for went bankrupt in 2002.  The patent application died with the company.

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Re: using magnets for feedback
10/27/2013 2:27:38 PM
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@salbayeng: Have fun!

I will do so -- thanks for all the advice -- keep watching for my future columns on this robot topic.

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Re:Robot Movement feedback
10/27/2013 2:25:07 PM
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@Douglas: I once built a sensor to track the slimey encrusted bottom of a ship for a ship hull inspection robot...

Wow -- it sounds like you have a mega-interesting job!!!

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Re: What does "Torque: 0.78Kg-cm (rated load)" mean?
10/27/2013 2:23:25 PM
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@Susan: I'm just saying that school boys can squeal as much as girls, and some of them even have higher voices for a time.

OK, who have you been talking to? That was a one-time incident and I have an excuse!!! :-)

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