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Gilles.Thesee(at)ac-greno
Guest

Posted: Sat Nov 18, 2006 8:47 am Post subject: Units

Bob and all,



 	  Quote: 	
		    I'll

    suggest we get back to the business of refining the

    best we know how to do



There has been a discussion on French homebuilding list servers, about 
	


US thread and drill bit sizes.

I compiled the following drill bit conversion table to inches and 

millimeters.  :



http://contrails.free.fr/article_drill_size_en.php



from different sources and re-computed fractional inches

I would welcome any feedback from listers here, about possible errors, 

omissions, etc.



Thanks,



Regards,

Gilles Thesee

Grenoble, France

http://contrails.free.fr

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oldbob(at)BeechOwners.com
Guest

Posted: Sat Nov 18, 2006 1:58 pm Post subject: Units

Good Afternoon Gilles,



You are very kind to be sharing this data with us, but

I wonder if it wouldn't be better if the inch based

sizes were listed down to the closest ten thousandth

of an inch rather than to the closest thousandth?



Back when I was gainfully employed as a flunky in a

tool and die shop, the pros constantly worked to the

closest "tenth" meaning one ten thousandth of an inch.

When making custom fits, they occasionally worked to

even tighter tolerances.



One one thousandth of an inch was considered a very

rough approximation!



As I am sure you have noted, you list several of the

number sized drills as having identical dimensions due

to their being rounded off to the closest one

thousandth of an inch.



Back before GAMI managed to get their balanced

injection nozzles approved, I was boring my own.  



In those days, I would buy a package of small "number"

drills of one size and note that those drills would

vary in size by two or three tenths (One ten

thousandth of an inch).  I found that it did make a

difference which drill I used as to how my injection

nozzles flowed.



While I am certainly NOT a good machinist, I do know

that, even in our phase of aviation, one ten

thousandth of an inch can make a difference.



Thanks again and:



Happy Skies,



Old Bob

AKA

Bob Siegfried

Ancient Aviator

Stearman N3977A

Brookeridge Air Park LL22

Downers Grove, IL 60516

630 985-8503



--- Gilles Thesee <Gilles.Thesee(at)ac-grenoble.fr>

wrote:



 	  Quote: 	
		   

 Thesee <Gilles.Thesee(at)ac-grenoble.fr>

 

 Bob and all,

 

 >  I'll

 >    suggest we get back to the business of refining

 the

 >    best we know how to do

 >

 There has been a discussion on French homebuilding

 list servers, about 

 US thread and drill bit sizes.

 I compiled the following drill bit conversion table

 to inches and 

 millimeters.  :

 

 http://contrails.free.fr/article_drill_size_en.php

 

 from different sources and re-computed fractional

 inches

 I would welcome any feedback from listers here,

 about possible errors, 

 omissions, etc.

 

 Thanks,

 

 Regards,

 Gilles Thesee

 Grenoble, France

 http://contrails.free.fr

 

 

 

 

 

 

 

 

 



 Click on

 about

 provided

 www.buildersbooks.com

 Admin.



 browse

 Subscriptions page,

 FAQ,

 http://www.matronics.com/Navigator?AeroElectric-List

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Gilles.Thesee(at)ac-greno
Guest

Posted: Sat Nov 18, 2006 2:30 pm Post subject: Units

Bob,



 	  Quote: 	
		  

 As I am sure you have noted, you list several of the

 number sized drills as having identical dimensions due

 to their being rounded off to the closest one

 thousandth of an inch.

   

Thank you for your message.
	


I must confess that my mind was set on the millimeter values.

Indeed, we consider one thousandth of an inch as large tolerance, as it 

is 2.5 "hundredth" of a millimeter.



I'll correct the table.



Regards,

Gilles

http://contrails.free.fr

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Gilles.Thesee(at)ac-greno
Guest

Posted: Sun Nov 19, 2006 2:50 pm Post subject: Units

Hi all,



Updated and corrected the drill bit chart



http://contrails.free.fr/article_drill_size_en.php



Whereas I meant it mainly for European homebuilders, I'm pleased to see 

that American visitors are by far the most numerous.



Best regards,

Gilles

http://contrails.free.fr

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