Drill size for AN3-10A, 11A, 15A and 20A Bolts

Discussion for Onex builders on specific plans page experience. These posts are limited to technical suggestions such as assembly order, challenges, or techniques related to specific plans pages.

Drill size for AN3-10A, 11A, 15A and 20A Bolts

Postby dhogue » Fri May 29, 2015 5:49 pm

Hello all,

I am ready to up drill the bolt holes through the Forward Center Wing Spar stack-up per plan pages ONX-W16 and ONX-W13.

Is there an optimal drill size to use for the holes these bolts fit into?

The bolts are:
AN3-10A
AN3-11A
AN3-15A
AN3-20A
AN525-8R20

Bolt diameter (measured) = .186 inches = 4.73 mm

Thanks,
Don
Don Hogue
Onex 0173: Tailwheel: AeroVee Turbo.
Horiz/Vert Stabs, Rudder/Elevators, Fwd/IB/OB/Aileron Bellcranks on Ribs and Main Fwd/Aft Center Wing Spars, Fuselage : Complete.
WIP: Wings
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Re: Drill size for AN3-10A, 11A, 15A and 20A Bolts

Postby dhogue » Sat May 30, 2015 10:44 am

After a search of 'drill bits' I will use a leveled drill press to drill these bolt holes.
I believe 3/16" is the right diameter drill bit to use.

I'd appreciate any good feedback.

Don
Don Hogue
Onex 0173: Tailwheel: AeroVee Turbo.
Horiz/Vert Stabs, Rudder/Elevators, Fwd/IB/OB/Aileron Bellcranks on Ribs and Main Fwd/Aft Center Wing Spars, Fuselage : Complete.
WIP: Wings
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Drill size for AN3-10A, 11A, 15A and 20A Bolts

Postby Sonex1517 » Sat May 30, 2015 11:16 am

Hi Don

3/16" worked well for me


Robbie Culver
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Re: Drill size for AN3-10A, 11A, 15A and 20A Bolts

Postby Concorde » Sat May 30, 2015 3:14 pm

Are you going to use 3/16 Reamer or drill bit ?
Ben
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Re: Drill size for AN3-10A, 11A, 15A and 20A Bolts

Postby dhogue » Sat May 30, 2015 5:24 pm

Thanks Robbie.

Concorde,
Drill. Is there an advantage to the reamer?

Much appreciated gents.
Don

Off to the hardware store it is.
Don Hogue
Onex 0173: Tailwheel: AeroVee Turbo.
Horiz/Vert Stabs, Rudder/Elevators, Fwd/IB/OB/Aileron Bellcranks on Ribs and Main Fwd/Aft Center Wing Spars, Fuselage : Complete.
WIP: Wings
dhogue
 
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Re: Drill size for AN3-10A, 11A, 15A and 20A Bolts

Postby rizzz » Sat May 30, 2015 7:14 pm

The reamer vs drill bit debate has been had over and over again.
Yes you can get better quality (tighter fit) holes drilling slightly undersize and then using a reamer, however, it does take more time and effort and it's easy to stuff up a hole as well.
Anyway Jeremy Monett (Sonex CEO) stepped in on the discussion on the old forum at one stage. He said that if proper care is taken, you should be able to complete your whole Sonex aircraft without using a reamer at all.
A 3/16 drill bit will be fine for your AN3 bolts.
Michael
Sonex #145 from scratch (mostly)
Taildragger, 2.4L VW engine, AeroInjector, Prince 54x48 P-Tip
VH-MND, CofA issued 2nd of November 2015
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Re: Drill size for AN3-10A, 11A, 15A and 20A Bolts

Postby DCASonex » Sun May 31, 2015 9:14 am

Reamers may not be required, but over the years I have found that a low cost set of 0.001" under - over reamers one of the more useful tools to have on hand.

David A.
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Re: Drill size for AN3-10A, 11A, 15A and 20A Bolts

Postby dhogue » Sun May 31, 2015 9:33 am

Thanks guys for the useful information. I will experiment, with both, on scrap stock.
Don Hogue
Onex 0173: Tailwheel: AeroVee Turbo.
Horiz/Vert Stabs, Rudder/Elevators, Fwd/IB/OB/Aileron Bellcranks on Ribs and Main Fwd/Aft Center Wing Spars, Fuselage : Complete.
WIP: Wings
dhogue
 
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Joined: Mon Sep 15, 2014 8:39 pm


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