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11-07-2014, 10:52 PM
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Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,035
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Posted by me previously...
Quote:
Originally Posted by rvbuilder2002
In the world of precision machining and drilling, .0005" can mean a lot.
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Quote:
Originally Posted by jswareiv
I received it today and the package says, .3115. So, Scott, will it make a difference that I should return it to Avery?
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I can't really answer that with a level of certainty. As already mentioned, AN5 bolts tend to be right around .311 in diam, but they have a tolerance, so if the ones you have to use are slightly larger it would be fine.
If it were my kit, I would use a .311 just to be sure.
__________________
Opinions, information and comments are my own unless stated otherwise. They do not necessarily represent the direction/opinions of my employer.
Scott McDaniels
Van's Aircraft Engineering Prototype Shop Manager
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
Last edited by rvbuilder2002 : 11-07-2014 at 10:55 PM.
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11-10-2014, 01:08 PM
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Join Date: Dec 2006
Location: New Orleans, LA
Posts: 474
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Reamer
Quote:
Originally Posted by rvbuilder2002
Posted by me previously...
I can't really answer that with a level of certainty. As already mentioned, AN5 bolts tend to be right around .311 in diam, but they have a tolerance, so if the ones you have to use are slightly larger it would be fine.
If it were my kit, I would use a .311 just to be sure.
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I really appreciate good customer service. I called Bob about the reamer and he actually has both, the .3110 and the .3115. The website listed both as .3110. He fixed the website and is sending me out the correct one, 7.9mm with a postage paid envelope to return the other one. Great customer service.
__________________
Stoney
First RV-14 Flight 04/17/2016
Serial #140087, N214SW - Sold
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11-12-2014, 04:09 PM
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Join Date: May 2006
Location: Boone, Iowa
Posts: 342
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I just had a customer call about this thread. For years the plans have said the same for the RV-10, but Van's tech support says 5/16" is fine at .3125". That is on the landing gear bolts. We are measuring to .00005" every day, so I feel like .0015" is a ballpark, however I know what it .0015" actually feels like in a hole, and while it's not a drive fit, it's not off by much. If you assumed a pinned joint vs. a fixed joint, and you assumed the wing length is roughly 6 times the spar to spar length, the wing at the tip may wiggle .009" back and forth. That's with the bolt loose, so it's not an alignment issue. Will it cause the joint to 'work' with motion or vibration should be a question Van's can answer (hopefully once and someone can post the answer), but for alignment it's closer than you can measure at those distances. I just took wing spar bolts out of an RV4 that were drive fit, made me want to cry by the time it was over... I can't imagine driving in the bolt in the confined area of the rear spar attach point. Perhaps if you could drill, ream, and bolt without ever unclamping or disassembling it would not be bad??
I stand corrected, see next post. It looks like I had bad information years ago that has continued until today. Thanks for quick and official clarification.
Last edited by clevtool : 11-12-2014 at 05:20 PM.
Reason: I was wrong.
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11-12-2014, 05:07 PM
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Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,035
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Quote:
Originally Posted by clevtool
I just had a customer call about this thread. For years the plans have said the same for the RV-10, but Van's tech support says 5/16" is fine at .3125". That is on the landing gear bolts. We are measuring to .00005" every day, so I feel like .0015" is a ballpark, however I know what it .0015" actually feels like in a hole, and while it's not a drive fit, it's not off by much. If you assumed a pinned joint vs. a fixed joint, and you assumed the wing length is roughly 6 times the spar to spar length, the wing at the tip may wiggle .009" back and forth. That's with the bolt loose, so it's not an alignment issue. Will it cause the joint to 'work' with motion or vibration should be a question Van's can answer (hopefully once and someone can post the answer), but for alignment it's closer than you can measure at those distances. I just took wing spar bolts out of an RV4 that were drive fit, made me want to cry by the time it was over... I can't imagine driving in the bolt in the confined area of the rear spar attach point. Perhaps if you could drill, ream, and bolt without ever unclamping or disassembling it would not be bad??
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The official answer from Van's engineering is to use the size tool specified in the construction manual.
ANY amount of movement in a fastener joint like the rear spar attach or landing gear legs is undesirable. The goal of using the .311 reamer is for a tight interference fit. You shouldn't need a 3 lb hammer to drive the bolt in, but the goal is for it to be a close fit. When looking for a close fit, .0015 is not ballpark. It is the difference between fitting tight, or easily rotated in the hole with your fingers.
__________________
Opinions, information and comments are my own unless stated otherwise. They do not necessarily represent the direction/opinions of my employer.
Scott McDaniels
Van's Aircraft Engineering Prototype Shop Manager
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
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