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stephen.hayne
Joined: 01 Nov 2013
Posts: 59
Location: United States
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 Posted: Sun Apr 09, 2017 7:48 pm Post subject: CJ6 Cone Bolt (or Taper Pin)... |
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Hey,
I'm replacing a "cone bolt" or taper pin in the rudder balance (see pics below - top one is fine), because the old one was corroded and not enough threads. The 2 I found in a box on this project and the new one I got from Doug are somewhat different in sizes. They don't fit the old holes, most likely because they were hand reamed for fit.
My problem is that the standard taper pin reamers (1:48), and the metric (1:50) ones are the wrong "angle" - their "taper per foot" is either 1/4" per foot, or just a little less for metric. These cone bolts measure out at about .5714-.5964" per foot, or ~1.35-1.42 degrees.
I'm hesitant to just file away with a tapered rat...
Any ideas?
Stephen
PS - wings are almost on, and this rudder balance is the last thing in the tail!
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_________________
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Stephen Hayne, Cyber Security Consultant, Professor Emeritus (retired)
443LM Nanchang CJA
http://selfsynchronize.com/hayne/plane/cj6.asp |
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stephen.hayne
Joined: 01 Nov 2013
Posts: 59
Location: United States
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| Posted: Thu Apr 27, 2017 9:52 am Post subject: Re: CJ6 Cone Bolt (or Taper Pin)... |
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OK - an update to the "taper pin reamer", or "cone bolt reamer" odyssey. I'm writing this down here so that google can find it and maybe other folks will find it useful...
I have found a reamer that will match this design of taper pin... after MUCH research and calling 3 different tool companies, I discovered that these use the "Jarno" angle/design, which is a 1:20 slope - not the 1:48 of the Morse standard, or 1:50 of Metric. And, one can buy these reamers fairly cheaply - $50. They come in all sorts of standard sizes, and I am going to try the #2, which might be perfect. Might need the #3 to go after the big end, maybe, given the depth of the overall "hole".
Jarno seems to be the middle name of the fellow who invented many of the standard tapers in the late 1800's! He was the engineering head of Browne and Sharpe... this was quite the "hunt" and almost enjoyable for a geek like me. 
http://www.circuitousroot.com/artifice/machine-shop/tapers/jarno/index.html
I ordered it from here...
http://gammons.com/files/Catalogs/Helical%20Jarno%20Taper%20Reamers.pdf
It worked PERFECTLY. The new cone bolt/taper pins fit beautifully, and I am very happy.
If anyone faces this problem, just contact me and I will loan you the reamer. No point in paying $55 for a one time use, like I did.
Stephen
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Stephen Hayne, Cyber Security Consultant, Professor Emeritus (retired)
443LM Nanchang CJA
http://selfsynchronize.com/hayne/plane/cj6.asp |
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