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10-30-2013, 08:56 PM
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Join Date: Aug 2011
Location: Monterrey, Mexico
Posts: 121
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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!
__________________
Miguel Vidal
EAA #1133587
RV-8 SB Wings in Monterrey, Mexico
N511MV Registered
MyKitLog
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10-30-2013, 09:02 PM
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Join Date: Dec 2012
Location: alaska
Posts: 309
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5/16 I believe
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10-30-2013, 09:44 PM
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Join Date: Aug 2011
Location: Monterrey, Mexico
Posts: 121
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Thanks but 5/16 is decimal .3125, way bigger than .1935
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Miguel Vidal
EAA #1133587
RV-8 SB Wings in Monterrey, Mexico
N511MV Registered
MyKitLog
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10-30-2013, 09:50 PM
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Join Date: Mar 2009
Location: Sydney, Australia
Posts: 617
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__________________
Eddie Seve
Sydney Australia
First Flight 16th July 2012
RV-7 Phase 2, 30 Oct 2012
1100 hrs Feb 2020
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10-30-2013, 10:29 PM
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Join Date: Mar 2008
Location: Ramona, CA
Posts: 2,370
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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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10-31-2013, 06:48 AM
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Join Date: Jun 2012
Location: Frederick, MD
Posts: 821
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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.
__________________
Dan Morris
Frederick, MD
PA28-140
Hph 304CZ
RV6 built and sold
N199EC RV6A flying
Learn the facts. "Democracy dies in darkness"
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10-31-2013, 09:39 AM
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Join Date: Jan 2005
Location: 57AZ - NW Tucson area
Posts: 10,011
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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.
__________________
Gil Alexander
EAA Technical Counselor, Airframe Mechanic
Half completed RV-10 QB purchased
RV-6A N61GX - finally flying
Grumman Tiger N12GA - flying
La Cholla Airpark (57AZ) Tucson AZ
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10-31-2013, 09:45 AM
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Senior Curmudgeon
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Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 15,420
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__________________
Mike Starkey
VAF 909
Rv-10, N210LM.
Flying as of 12/4/2010
Phase 1 done, 2/4/2011 
Sold after 240+ wonderful hours of flight.
"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
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10-31-2013, 07:19 PM
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Join Date: Jul 2013
Location: KAVL
Posts: 317
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Quote:
Originally Posted by mvidalr
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.
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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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10-31-2013, 07:47 PM
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Join Date: Jul 2012
Location: Poplar Grove, IL
Posts: 59
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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
__________________
Michael Foss
Workshop Completed
RV-8 Empennage Completed
RV-8 Wings Completed
RV-8 Fuselage Completed
AeroSport IO-375
Hartzell Composite Propellor
First Flight 10/19/2020
N800MF
Follow my build at www.rv8-hangar.com
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