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01-23-2009, 01:01 PM
| #1 |
| Pebble Pounder Join Date: Sep 2005 Location: West Coast Canada
Posts: 177
|  Found a page about gearing
Ok so this is not specifically about Rock Forces, but I found the gearing/transmission stuff quite "mind boggling" so i did some searching and this page sums it all up quite nicely. Maybe the mod can add it or a link to the FAQ page? or maybe i'm the only one who finds it informative lol. http://www.rccaraction.com/ME2/Sites...5200E5A3C25B85 |
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01-23-2009, 01:35 PM
| #2 |
| Quarry Creeper Join Date: May 2005 Location: Crossville,TN
Posts: 363
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Great source of information. Will definitely bookmark that page. Thanks, Carl |
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01-23-2009, 02:34 PM
| #3 | |
| MODERATOR™   Join Date: Jul 2004 Location: Ohio
Posts: 18,928
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01-23-2009, 06:19 PM
| #4 |
| RCC Addict Join Date: Nov 2008 Location: never been
Posts: 1,317
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glad i caught this thread. thanks to OP for the link |
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01-23-2009, 07:19 PM
| #5 |
| Pebble Pounder Join Date: May 2006 Location: Anaheim
Posts: 139
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Now here is something I have always debated, it almost makes since to me, but not quite. Say you have a 20 tooth pinion gear and a 100 tooth spur gear = 5 to 1 ratio. Or a 10 tooth pinion and a 50 tooth spur spur gear = 5 to 1 ratio. So, I have been told numerous times by my Hobby store owner, coworkers and racers and crawlers and fliers and etc that the 10 tooth will offer more torque. No way is what I say. Anyone actually be able to explain why if true the 10 tooth has more torque? |
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08-07-2009, 08:21 AM
| #6 |
| Pebble Pounder Join Date: Jun 2009 Location: Jackson
Posts: 141
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I think it is because the 10t gear is smaller in diameter than the 20t.
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08-07-2009, 09:38 AM
| #7 |
| I wanna be Dave Join Date: Mar 2009 Location: sittin in the sky
Posts: 4,630
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i think it would offer a tad more tourqe but not enough to notice
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08-07-2009, 10:10 AM
| #8 |
| I wanna be Dave Join Date: Feb 2009 Location: 20 miles southeeast of downtown Sacramento
Posts: 2,373
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The gearing is the same so torque/speed will be the same. The only difference is the weight/size of the larger 100t spur's flywheel effect. It will rev up/down slower, but it would be hard to measure.
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08-07-2009, 11:45 AM
| #9 |
| MODERATOR™ Join Date: Jul 2004 Location: Ohio
Posts: 18,928
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Back in the biking days we used to try to use the largest gears possible for more tooth engagement on the chain for strength reasons. These RC cars and their plastic spur gears seem to benefit from larger pinion gears as well, as there's more tooth engagement. Less stripped spur gears. Something to consider when choosing your gear set up I suppose. |
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08-08-2009, 09:18 PM
| #10 | |
| Newbie Join Date: Apr 2007 Location: Southern Tier, NY
Posts: 38
| Quote:
example: Lets take an automotive differential. Lets keep the math easy and say the transmission is supplying the rear pinion gear via the drive shaft with 100 ft-lbs of torque. Lets throw in a gear ratio of 25:1 (25 ring, 10 pinion). Take the input torque and multiply it by the gear ratio and you get 250 ft-lbs of torque to your wheels. Now lets change out the pinion gear to a 9 tooth gear. This will provide you with a ratio of 2.78:1 and yield an output torque of ~ 278 ft-lbs. So just by decreasing the pinion by one tooth you increase your torque to the ground by 28 ft-lbs. | |
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