Subject:
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Re: What is RPM of Gear Motor???
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Newsgroups:
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lugnet.robotics
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Date:
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Wed, 7 Jul 1999 14:59:58 GMT
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Original-From:
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alex wetmore <alex@STOPSPAMphred.org>
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Viewed:
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938 times
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On Wed, 7 Jul 1999, RoninSFX wrote:
> Using a Futaba 9ZAP radio with a built in optical tachometer and the two bladed
> LEGO prop I got 380 rpm for the gearhead motor and 4320 rpm for the older
> nongeared motor. Of course this was done with a battery box and brand new
> batteries so I am sure that these results will vary with each motor. I also did
> all the possible gear ratios you can make with LEGO gears and found out that
> none of the combinations will allow you to drop the old 9v nongeared motor down
> to the same rpm as the gearhead motor.
You could get close using the differential as an adder.
The ratio of speeds above is about 11:1 (its 11.3:1, but lets keep
things as integers). That is a prime number, and we know there
aren't any lego gear options that give you an 11:1, so that leaves
out a normal set of reductions pretty much right away.
However, you could do this by adding 5:1 gearbox to a 6:1 gearbox.
5:1 is pretty easy to make with the 40:8 gears. 6:1 can be made
by combining the 24:8 and the 16:8.
alex
--
Did you check the web site first?: http://www.crynwr.com/lego-robotics
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Message has 1 Reply:
 | | Re: What is RPM of Gear Motor???
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| (...) Assuming those numbers are correct (I've been too slack to actually look up the tooth counts), I'll give further clarification on my earlier post. I'm using a combination of three 40:8 combos, giving me an effective ratio of 125:1. The gearing (...) (25 years ago, 7-Jul-99, to lugnet.robotics)
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Message is in Reply To:
| | Re: What is RPM of Gear Motor???
|
| Using a Futaba 9ZAP radio with a built in optical tachometer and the two bladed LEGO prop I got 380 rpm for the gearhead motor and 4320 rpm for the older nongeared motor. Of course this was done with a battery box and brand new batteries so I am (...) (25 years ago, 7-Jul-99, to lugnet.robotics)
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