Larger Spurs

[lesannatrevor]

Hey all. I was wandering if anyone knew anywhere I could get a spur in the range of 100T or up? I have looked on Robinson Racing But they only have up tp 96T.

[grapegoat]

I think high 90's is all your gonna find. after that, lower your pinion tooth. that is plenty of reduction.

[DumpsterRC]

Thy are available but not at typical RC places. They can be had from industrial suppliers such as;
http://catalog.catalogds.com/ecatalo...lter_value=all
I have never done business with this company and I know there are others that make gears in these sizes.

Do a Google search for miniature spur gears, or nylon spur gears and it should get you a few suppliers. They can typically be found in brass, aluminum, nylon, s.s., and delrin (acetal).

The hub will probably have to be modified for your application.

When I was looking for them, I was looking at making a maxx differential into a tranny. I needed a larger spur gear, not for the gearing, but for the extra diameter. So the pinion and the spur would mesh.

[Offroader5]

Most of the industrial spurs and pinions found don't have the smaller bores for the smaller scale of RC vehicles. Many of them I have seen when searching for myself had too large of bores to be usefull, so make sure your looking at that bore size and not just the tooth count.

BTW, your link isn't working

[DumpsterRC]

Originally Posted by Offroader5

Most of the industrial spurs and pinions found don't have the smaller bores for the smaller scale of RC vehicles. Many of them I have seen when searching for myself had too large of bores to be usefull, so make sure your looking at that bore size and not just the tooth count.

BTW, your link isn't working

Agreed, adapters may be necessary. Sorry about the link, it worked when I posted.

[Grizzly4x4]

From my experience with dirt bikes, lowering your pinion gearing by 1 tooth should be approximately equal to adding 3 teeth to the spur gear.

[Mechanicalbob]

Well you can find them at servocity.com They have a lot of neat things there that can be adapted. This gear can be up to 126T.

ServoCity - Mechanicals & Accessories - Gears & Sprockets - Hub Mount Gears 20° Pressure Angle
Thickness = 1/8” (.125”)
Material = 2024 T6 Anodized
Bore = 3/8” (.375”)
O.D. = Outside Diameter
P.D. = Pitch Diameter
Mounting our hub requires 4 holes to be drill for the 5-40 screws.





You will also need one of these. With this you can run any of the spurs.

[Mnster]

Wow damn good prices to. Good find

[Offroader5]

That's alot of good info there...I'll have to check that site out.

[Mnster]

I've ordered servos from the servo hut before. He's very good seller, knows his product line well but is mostly is into planes and stuff though.

I'm thinking those spurs would work great on a BL pede.

[Mechanicalbob]

Originally Posted by Mnster

Wow damn good prices to. Good find

It is a great site I have been going over there for about a year now There a lot of neat sites for little things

Originally Posted by Offroader5

That's alot of good info there...I'll have to check that site out.

They have a lot of cool things there to be adapted to what you want

[Offroader5]

Originally Posted by Mechanicalbob

It is a great site I have been going over there for about a year now There a lot of neat sites for little things



They have a lot of cool things there to be adapted to what you want

I am filling my cart there now and I can't stop

[Mechanicalbob]

Originally Posted by Offroader5

I am filling my cart there now and I can't stop

Well if you liked that one try this one out too
http://www.robotmarketplace.com/store.html


R/C GEAR - RADIOS & TRANSMITTERS

$349.99

They also have these. I have used some but not from them. They are cheaper to get from a Pawn Shop or a yard sale. Also other cordless things work great too

$51.99 QTY Check out the shafts & shaft spindles available for this transmission!

DeWalt Transmission for 24V motor

This is DeWalt's factory gearbox from the extremely popular, albeit bulky, 24vdc cordless power or hammer drill. Exclusively made by DeWalt for their 24v cordless drills. This is the original version of the gearbox that made more bots run than any other non-custom gearbox, including the 18v version.
These 2-speed, planetary gearboxes with all metal gears and a reinforced shaft bearing represent the best value in high technology, power and price. It is simply the best 24v drill motor gearing solution you're going to find for the price, and has an incredibly thoroughly proven track record.
The specific numerical values below reflect those discovered by bot builders, and DeWalt does not approve nor deny them as accurate.
For Motor # 24vDeWalt Part #388974-00Input accepts 19 teeth Length3.125"Diameter2.0"Output ShapeX - spline Gearing #1 RPMs450Gearing #2 RPMs2000Max Torque 550 inch poundsLubricationGreaseWeight 17.7oz or 1.1062 Lbs

[Mnster]

Even got a free baggy of candy when ordering.

The 90t 48p spur fits the pede trans like a glove.

[lesannatrevor]

Great info everyone. Thanks to all who have contributed. Mechanicalbob, my wife dislikes you now for showing me that site!

[Mechanicalbob]

Originally Posted by lesannatrevor

Great info everyone. Thanks to all who have contributed. Mechanicalbob, my wife dislikes you now for showing me that site!

Yours is not the first Mine has not liked the sites I find. She has takin the plastic away.

[S1NN3R]

Originally Posted by Grizzly4x4

From my experience with dirt bikes, lowering your pinion gearing by 1 tooth should be approximately equal to adding 3 teeth to the spur gear.

It depends on your spur/pinion ratio to begin with. If you have a 3/1 ratio, then yes, dropping one on the pinion is equal to adding three on the spur. But if you have a lower ratio to start with, then one on the pinion equals much more, for example with a 6/1 ratio, dropping one from the pinion gives you the same ratio as adding 6 to the spur. If you have a 9.495883/1 ratio, then going down one tooth on the pinion is like adding 9.495883 teeth to the spur, and so on.