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  #1  
Old 10-30-2013, 08:56 PM
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mvidalr mvidalr is offline
 
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Question Fractional for a #10 drill bit

Hello my fellow builders,

Which would be the fractional equivalence to a #10 drill bit used to enlarge the prepunched holes for the stall warner vane in a RV-8? Same applies to the -7 & -9 for what I understand.

I don't have this drill bit, and just like the famous #40 is a 3/32", and the #30 is a 1/8", i was wondering which would be the #10 required in the manual.

I know that according to the Aviation Standard book is (in decimal) .1935 but this does no good from the vast array of fractional drill bits that I have.

Thanks for the input!
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  #2  
Old 10-30-2013, 09:02 PM
stamper stamper is offline
 
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5/16 I believe
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  #3  
Old 10-30-2013, 09:44 PM
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mvidalr mvidalr is offline
 
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Thanks but 5/16 is decimal .3125, way bigger than .1935
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  #4  
Old 10-30-2013, 09:50 PM
eddieseve eddieseve is offline
 
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Try this link;

http://www.csgnetwork.com/drillsizeconvert.html

Cheers
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  #5  
Old 10-30-2013, 10:29 PM
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bruceh bruceh is offline
 
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My advice: buy a complete set of numbered and lettered bits. You will use them in various places of the build (holes for tapping, holes in UHMW plastic, slightly smaller ones for drilling out rivets, etc.).
I found a complete drill bit index set at Costco a few years ago. A quick google search shows you can buy one for about $60.
If you really just want single bits, you can find these at most industrial supply shops. I've had to replace a few bits that met an ugly demise.
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  #6  
Old 10-31-2013, 06:48 AM
RVDan RVDan is offline
 
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I second the move to buy a number drill set. No number drills exactly match fractions- and that is for a reason. If you use fractions for rivets the rivets will fit tight in the holes or not at all. Trying to put a 3/32 rivet in a 3/32 hole= 0 clearance, whereas a #40 will get you about .004 clearance. Same applies to 1/8 and so on. If you use the proper number drill the rivets fit properly. Same goes for screws and bolts. The metal world works in decimal- i.e. number and letter drills.
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Old 10-31-2013, 09:39 AM
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az_gila az_gila is offline
 
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Default Individual sizes needed

If you buy individual number drill sizes, the contents list of the Plane Tools full RV tool kit gives a good list of the sizes you need -

#40 Aviation Cobalt Drill Bits for 3/32" rivets, 8 each
#30 Aviation Cobalt Drill Bits for 1/8" rivets, 6 each
#27 Aviation Cobalt Drill Bit
#21 Aviation Cobalt Drill Bit
#19 Aviation Cobalt Drill Bit
#12 Aviation Cobalt Drill Bit
1/4" Aviation Cobalt Drill Bit
12" Aviation Extra Long #40 Drill Bit
12" Aviation Extra Long #30 Drill Bit


Note that a #12 drill is called up for use in making an AN3 bolt hole. It will give a better fit than a #10 drill you originally asked about.

However, buying a full number drill set is still a good idea.
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  #8  
Old 10-31-2013, 09:45 AM
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http://www.custompartnet.com/drill-size-chart
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  #9  
Old 10-31-2013, 07:19 PM
Jasonm Jasonm is offline
 
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Quote:
Originally Posted by mvidalr View Post

and just like the famous #40 is a 3/32", and the #30 is a 1/8", i was wondering which would be the #10 required in the manual.

Don't be mistaken, a #40 is not a 3/32, nor is a #30 a 1/8 bit. When it comes to drilling for a rivet. The difference is larger than you think. The numbered bits you should be using are cheap. Think about what you're building and please don't cut corners.
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  #10  
Old 10-31-2013, 07:47 PM
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ConAgraPilot ConAgraPilot is offline
 
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Default Menards

I found that my local Menards, here in Illinois, has numbered bits from 1 to 60. Nice when you find that you need a special size and need it now. Not sure if all Menards carry them!

Michael
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