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tight fit?

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jlfernan

Joined: 10 Jun 2006
Posts: 51
Location: MIAMI

Posted: Thu Sep 18, 2008 12:50 pm Post subject: tight fit?

There are a couple places I've seen so far in the instructions that call for a hole to be reamed to a tight fit. When I use a 3/16"(.1875) reamer, the bolts are usually a tight fit. On the flaperon mixer, two spots call for a .250 reamer and a tight fit, but the bolts that I have are only .246". How do I achieve a tight fit? I realize that AN bolts can vary in size but I don't think I can get a bolt supplier to check each bolt. Also when I fit bolts to the bushings, such a the ones on the side of the fuse where the mixer attaches, I always seem to end up with a tiny amount of play depending on the bolt I happen to pick up. Anyone see a problem? Near my home there is an aviation hardware distributor that sell NAS and AN close tolerance bolts, would this be a better solution?

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_________________
Jorge Fernandez
Supersport
Fuselage/Forward Controls
http://websites.expercraft.com/jlfernan/

Lynn Matteson

Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan

Posted: Thu Sep 18, 2008 6:23 pm Post subject: tight fit?

Aircraft Spruce, and I'm sure others, have "close tolerance bolts"  

that are supposed to be closer to the stated size...that is, closer  

to .250" fora 1/4" bolt. I ordered some of these and found they they  

were a thousandth or two SMALLER than the ones that I had, so good  

luck in finding a better fit. On places like that, now that you're  

aware of it, I think I'd mike the bolts beforehand, and ream slightly  

small at first. Reamers are available in almost any size imaginable,  

so if you have a machinist supply house available to you, I'd get  

some slightly smaller reamers...hope you haven't got them all reamed  

already.



Lynn Matteson

Kitfox IV Speedster

Jabiru 2200, 562 hrs...engine assembled and back in the plane;  new  

ignition system received...WOW!

one bracket built, maybe 3 to go

Flight possible this weekend...XX (fingers crossed)

Status: "Condition grounded, but determined to try."  (Pink  

Floyd..."Learning to Fly")





On Sep 18, 2008, at 4:50 PM, jlfernan wrote:



 	  Quote: 	
		   



 There are a couple places I've seen so far in the instructions that  

 call for a hole to be reamed to a tight fit. When I use a 3/16"(. 

 1875) reamer, the bolts are usually a tight fit. On the flaperon  

 mixer, two spots call for a .250 reamer and a tight fit, but the  

 bolts that I have are only .246". How do I achieve a tight fit? I  

 realize that AN bolts can vary in size but I don't think I can get  

 a bolt supplier to check each bolt. Also when I fit bolts to the  

 bushings, such a the ones on the side of the fuse where the mixer  

 attaches, I always seem to end up with a tiny amount of play  

 depending on the bolt I happen to pick up. Anyone see a problem?



  (http://imageshack.us)



 --------

 Jorge Fernandez

 Supersport

 Fuselage/Forward Controls

 http://websites.expercraft.com/jlfernan/





 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p 4974#204974

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_________________
Lynn
Kitfox IV-Jabiru 2200
N369LM

Tom Jones

Joined: 12 Mar 2006
Posts: 752
Location: Ellensburg, WA

Posted: Fri Sep 19, 2008 4:04 am Post subject: Re: tight fit?

 	  Quote: 	
		  How do I achieve a tight fit? 	




Jorge, the flaperon mixer bolts are supposed to be tight so they don't rotate in the fuselage mounting holes when the flaps are deployed and/or retracted.  When I was building there was much discussion on how to keep them tight.



The method I used was locktight under the head of the bolt.  It was suggested to me by an A&P mechanic.

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_________________
Tom Jones
Classic IV
503 Rotax, 72 inch Two blade Warp
Ellensburg, WA

Float Flyr

Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland

Posted: Fri Sep 19, 2008 6:15 am Post subject: tight fit?

Check out interference fit bolts.... or measure your bolt and drill the hole

accordingly.



Noel



--

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Noel Loveys
Kitfox III-A
Aerocet 1100 Floats

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