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1/8" to 3/32" gear sleeves


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#1 Dallas Racer

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Posted 12 January 2018 - 03:17 PM

I bought some 1/8" aluminum tubing to make some gear sleeves to use on the spur and pinion of vintage style rail cars (my latest obsession). I slipped the 12" tube on to the motor shaft of a KTM motor that has a slightly bigger than 3/32" dia. armature shaft. My intent was to see if I could force it on. To my surprise, it not only easily slipped on, but was loose! It was a WTF moment. So I go to K&B's website and look up the specs. Both aluminum and brass 1/8" tubing have .125" O.D. (good) and .014" wall thickness (not good). That makes the I.D. .097". 3/32" is .0938". That is a .0032" difference. That doesn't sound like much but it's a noticeable amount. Even on the KTM shaft that is slightly over 3/32".

 

It dawn on me while writing this that that small of an amount wouldn't matter much/at all on a crown gear like is used in Retro. But I'm going to be using it on a sidewinder, and on 64P spur (vintage Weldum) and pinion (RC car motor pinions). Both gears are going to be running slightly out of round. To compound the problem 64P teeth are really small.

 

That doesn't seem good. Any suggestions?


Phil Smith ® ™





#2 Racer36

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Posted 12 January 2018 - 03:32 PM

Why not buy a bag of premade sleeves from Parma or Chicagoland? Saves a whole lot of aggravation.


Dennis Dominey

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#3 Dallas Racer

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Posted 12 January 2018 - 03:36 PM

I assumed they are made out of the same tubing. But maybe not?


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#4 Racer36

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Posted 12 January 2018 - 03:43 PM

They are brass


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#5 Dallas Racer

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Posted 12 January 2018 - 03:53 PM

Yes, but K&B brass tubing has the same dimensions as aluminum tubing. Maybe other brands has different dimensions?


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#6 Jesse Gonzales

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Posted 12 January 2018 - 04:03 PM

This takes time but when you are retired so what, dimple the tubing by rotating it and tighten down on a setscrew, it works well and is lighter than brass. Did this way back for Cox and early FASS gears.



#7 MSwiss

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Posted 12 January 2018 - 04:30 PM

With K &S tubing, I've found the OD tends to vary more than the ID.

 

I bought a batch of precut brass sleeves at the onset of Retro racing and they measured close to .125".

 

When I finally had to re-buy, 5 or so years later, they wound up being more like .123"/.1235".

 

Without gage pins, it's hard to measure the exact ID of my brass sleeves.

 

Checking both the old ones, which I have a small handful of, and the new ones, that I have a jillion, on a Koford 3/32 axle, there is just the tiniest bit of slop.

 

I would guess the ID at .095"/not anywhere near .097".


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#8 Bryan Warmack

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Posted 12 January 2018 - 04:33 PM

I assumed they are made out of the same tubing. But maybe not?

  Phil,

      The regular tubing is basically unusable as sleeves as even the .003 is way too much slop!  The Parma or Chicagoland sleeves are what you want.



#9 MSwiss

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Posted 12 January 2018 - 04:42 PM

  Phil,

      The regular tubing is basically unusable as sleeves as even the .003 is way too much slop!  The Parma or Chicagoland sleeves are what you want.

Mine are just tubing and I don't get any complaints.

 

IIRC, the Parma ones might be a machined piece, and might be a better choice for Phil.


Mike Swiss
IRRA® Components Committee Chairman
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Two-time G7 World Champion (1988, 1990), eight G7 main appearances
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17B West Ogden Ave Westmont, IL 60559, (708) 203-8003, mikeswiss86@hotmail.com (also my PayPal address)

Note: Send all USPS packages and mail to: 5858 Chase Ave., Downers Grove, IL 60516


#10 John Streisguth

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Posted 12 January 2018 - 04:43 PM

McMaster has 0.02" wall thickness 1/8" tubing brass, you can ream the center bore out to 3/32.  They don;t give a tolerance on the OD.


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#11 MSwiss

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Posted 12 January 2018 - 04:48 PM

IMO, reaming an .085" ID,  tube, accurately to 3/32", without a lathe with collets, and/or numerous reamers, is pretty slim.


Mike Swiss
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Five-time USRA National Champion (two G7, one G27, two G7 Senior)
Two-time G7 World Champion (1988, 1990), eight G7 main appearances
Eight-time G7 King track single lap world record holder

17B West Ogden Ave Westmont, IL 60559, (708) 203-8003, mikeswiss86@hotmail.com (also my PayPal address)

Note: Send all USPS packages and mail to: 5858 Chase Ave., Downers Grove, IL 60516


#12 Dallas Racer

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Posted 12 January 2018 - 07:13 PM

Thanks everyone!

 

It dawned on me that I can resolve the spur gear problem by running an 1/8" axle instead of a 3/32".

 

On the pinion, I'm going to try your suggestion, Jesse.


Phil Smith ® ™


#13 MSwiss

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Posted 13 January 2018 - 10:06 AM

Was there any particular reason you are refering to K & S tubing as K & B? Lol

Mike Swiss
IRRA® Components Committee Chairman
Five-time USRA National Champion (two G7, one G27, two G7 Senior)
Two-time G7 World Champion (1988, 1990), eight G7 main appearances
Eight-time G7 King track single lap world record holder

17B West Ogden Ave Westmont, IL 60559, (708) 203-8003, mikeswiss86@hotmail.com (also my PayPal address)

Note: Send all USPS packages and mail to: 5858 Chase Ave., Downers Grove, IL 60516


#14 Dallas Racer

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Posted 13 January 2018 - 10:31 AM

Because I'm stupid?

 

I do have dyslexia. I make grammatical, spelling and general stupidity mistakes all the time.


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#15 Racer36

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Posted 13 January 2018 - 10:54 AM

Dyslexia is not a requirement to make general stupidity mistakes. I have proof.

Dennis Dominey

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#16 Phil Hackett

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Posted 14 January 2018 - 08:17 PM

Lexdysia.


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