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 Posted - December 19 2012 : 1:26:55 PM
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I plan on trying a PT CD ROM remotor soon. I found one I had with a gear. It meshed nicely with the PT gears. its 2 times the size of the stock motor pinion gear. With that said, will the gearing get lower or higher?
" Heck with counting 'em rivets, TRAINS ARE FOR FUN! Not called the Mad Scientist for nothing either!"
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Posted - December 19 2012 : 2:37:20 PM
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A larger pinion on the motor will give you a lower ratio.
More speed, less torque.
Depending on how many teeth it has, it may not be a significant change in the ratio to make a noticeable difference.
Ray
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Posted - December 19 2012 : 2:54:05 PM
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Would this help much with anything? Besides, I don't pull no more than 8-12 cars behind a PT loco.
" Heck with counting 'em rivets, TRAINS ARE FOR FUN! Not called the Mad Scientist for nothing either!"
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Posted - December 19 2012 : 5:52:53 PM
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A stock PT has a 16.875/1 gear ratio.
primary reduction being an 8 tooth pinion and a 45 tooth driven gear. Which is 5.625/1
the secondary reduction is an 8 tooth pinion and 24 tooth driven gear (gear on the wheel). Which is 3/1 ratio.
multiply the two together and you get 16.875/1 ratio.
If you used a 15 tooth pinion on the motor for instance.
the primary reduction would only be 3/1 which would result in a final reduction of 9/1.
While there are some HO locomotives that do have 9/1 gear ratios, they have heftier motors than most typical CD style motors. I have found some CD motors that are rated at 13 volts. one of those might work.
however, You could try one of the lower voltage motors, you may end up with a loco that will give an Athearn Hustler a run for it's money.
Ray
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Posted - December 19 2012 : 6:46:08 PM
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I just realized the block would need some mods. The new gear won't line up.
" Heck with counting 'em rivets, TRAINS ARE FOR FUN! Not called the Mad Scientist for nothing either!"
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Posted - December 19 2012 : 7:05:12 PM
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[quote]A stock PT has a 16.875/1 gear ratio.
primary reduction being an 8 tooth pinion and a 45 tooth driven gear. Which is 5.625/1
the secondary reduction is an 8 tooth pinion and 24 tooth driven gear (gear on the wheel). Which is 3/1 ratio.
multiply the two together and you get 16.875/1 ratio.
If you used a 15 tooth pinion on the motor for instance.
the primary reduction would only be 3/1 which would result in a final reduction of 9/1.
While there are some HO locomotives that do have 9/1 gear ratios, they have heftier motors than most typical CD style motors. I have found some CD motors that are rated at 13 volts. one of those might work.
however, You could try one of the lower voltage motors, you may end up with a loco that will give an Athearn Hustler a run for it's money.
your info is impressive
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Posted - December 19 2012 : 9:43:39 PM
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The prototype has 3 stages of reduction with a 40.5/1 ratio.
Ray
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Posted - December 19 2012 : 10:11:15 PM
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Ray, how does it run?
" Heck with counting 'em rivets, TRAINS ARE FOR FUN! Not called the Mad Scientist for nothing either!"
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Posted - December 19 2012 : 10:26:55 PM
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Now THATS a DAMN interesting retro fit to a TYCO motor!
LOVE IT! Slowwwwwwwwwwwwwwwwwwww ......I bet!
~John
Many have tried to, and failed, ya just can't repair stupid...
Do NOT try to Idiot-Proof anything!!!! God, will simply create a better......IDIOT!
Edited by - EM-1 on December 19 2012 10:27:49 PM
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Posted - December 20 2012 : 12:11:37 AM
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With that much gearing, it is slow. No more noise than a stock PT but Very powerfull.
I added a little more weight to the loco than stock which makes it pull more than any other 4WD loco I have.
Ray
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Jim
Little Six
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Posted - December 20 2012 : 8:35:23 PM
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| very nice, I need to try this some day!!
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