RCCrawler Forums

toy4crawlin · 08-19-2009, 01:22 PM

Steel , Aluminum, Kevlar, Delrin, tempured plastic ?

I just installed Robinson internals in my axial tranny after stripping the stock Idler for my Super and was Crawling at Fordyce trail and busted my hpi carbon 90 spur :-(

I'm thinking that a 32 pitch is the most reliable for the weight and torque of these monsters

Do I go with Steel or Aluminum 48 pitch or use 32 pitch kevlar ?

Axial tranny
steel outputs
Robinson Aluminum internal gears

Thanks

Offroader5 · 08-19-2009, 01:48 PM

On all my more comp level rigs with all the wheelspeed and torque from the Pullers I have switched over to 32 pitch gearing. You can get 32p spurs made of delrin from http://http://www.servocity.com/html...unt_gears.html

They are thicker at 3/16" also. I have found that especially with the torquey Puller motors, 32 pitch also helps when the motor plate flexes and pulls the tooth contact a bit out of whack. The deeper grooves of the 32p gear allows some movement between the pinion and spur.

toy4crawlin · 08-19-2009, 03:57 PM

right awn

thank you

what ratio you guy's running ?

I'm at 6.4:1 spur pinion about 55:1 total

Something to bookmark
Here's a very cool Tool, very easy and adapts to just about any RC to do the gear, speed and rpm,gear calculations http://scriptasylum.com/rc_speed/_top_speed.html

toy4crawlin · 08-20-2009, 07:09 PM

had some 32 pitch on hand,

48 pitch 90t/14 =6.4:1 -- swap to --> 32pitch 66/10 = 6.6:1

Crawling Great again

might try 64/18 =3.5:1 for racing

08-19-2009, 01:22 PM	#1
toy4crawlin I wanna be Dave Join Date: Feb 2006 Location: Campbell, CA 4 hrs 2Rubicon ! Posts: 2,044	WHat SPur gear Pitch is best ? Steel , Aluminum, Kevlar, Delrin, tempured plastic ? I just installed Robinson internals in my axial tranny after stripping the stock Idler for my Super and was Crawling at Fordyce trail and busted my hpi carbon 90 spur :-( I'm thinking that a 32 pitch is the most reliable for the weight and torque of these monsters Do I go with Steel or Aluminum 48 pitch or use 32 pitch kevlar ? Axial tranny steel outputs Robinson Aluminum internal gears Thanks Attached Images Last edited by toy4crawlin; 08-19-2009 at 01:25 PM.

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08-19-2009, 01:48 PM	#2
Offroader5 Picky Fab'r/Acetal Junky Join Date: Jul 2006 Location: Arizona Desert/AJ Posts: 3,073	On all my more comp level rigs with all the wheelspeed and torque from the Pullers I have switched over to 32 pitch gearing. You can get 32p spurs made of delrin from http://http://www.servocity.com/html...unt_gears.html They are thicker at 3/16" also. I have found that especially with the torquey Puller motors, 32 pitch also helps when the motor plate flexes and pulls the tooth contact a bit out of whack. The deeper grooves of the 32p gear allows some movement between the pinion and spur.

08-19-2009, 03:57 PM	#3
toy4crawlin I wanna be Dave Join Date: Feb 2006 Location: Campbell, CA 4 hrs 2Rubicon ! Posts: 2,044	right awn thank you what ratio you guy's running ? I'm at 6.4:1 spur pinion about 55:1 total Something to bookmark Here's a very cool Tool, very easy and adapts to just about any RC to do the gear, speed and rpm,gear calculations http://scriptasylum.com/rc_speed/_top_speed.html

08-20-2009, 07:09 PM	#4
toy4crawlin I wanna be Dave Join Date: Feb 2006 Location: Campbell, CA 4 hrs 2Rubicon ! Posts: 2,044	had some 32 pitch on hand, 48 pitch 90t/14 =6.4:1 -- swap to --> 32pitch 66/10 = 6.6:1 Crawling Great again might try 64/18 =3.5:1 for racing

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Thread: WHat SPur gear Pitch is best ?