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04-02-2018, 12:29 PM
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Join Date: Sep 2007
Location: Central IL
Posts: 5,516
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Quote:
Originally Posted by Mark Dickens
I just take my hand drill and very carefully drill a #40 pilot hole on one side. Then put it in the jig and drill it through to the other side with the drill press. It's always worked for me.
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Yep, and look through the end to visually align through the center, the curve will do the rest.
It is the location on the opposite side that makes it a diametrical hole.
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Bill
RV-7
Lord Kelvin:
“I often say that when you can measure what you are speaking about,
and express it in numbers, you know something about it; but when you
cannot measure it, when you cannot express it in numbers, your knowledge
is of a meager and unsatisfactory kind.”
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04-02-2018, 12:46 PM
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Join Date: Jan 2016
Location: Southwest
Posts: 1,119
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gave up on rivets
I gave up on the rivets and welded mine. For my 9, the rivets touched the rear spar at the extreme ends of travel and I didn't like that. YMMV
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John S
WARNING! Information presented in this post is my opinion. All users of info have sole responsibility for determining accuracy or suitability for their use.
Dues paid 2020, worth every penny
RV9A- Status:
Tail 98% done
Wings 98% done
Fuselage Kit 98% done
Finishing Kit 35% canopy done for now
Electrical 5% in work
Firewall Forward 5% in work
www.pilotjohnsrv9.blogspot.com
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04-02-2018, 12:54 PM
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Join Date: Jul 2017
Location: Napa Valley
Posts: 28
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Drilling hole in round tube
Might try a "center drill" into punch mark to get hole started. Or I often use a small end cutting end mill instead of drill bit.
Set up will need to be as rigid as possible for the milling cutter and with a slow feed rate into material. Not something you can "hand hold."
A milling machine is preferred, but small end cutters will work in a drill press as long as there isn't much play in the spindle.
Can probably get the above bits at a local machine tool supply store (if you have one in your area) or Amazon or MSC on line.
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04-02-2018, 01:09 PM
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Join Date: Dec 2012
Location: Katy, TX
Posts: 233
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I would use this: https://youtu.be/n7HLfHZlKL4
Instead of clamping, firmly duck tape the v guide to the tube and use a hand drill. I used that on the tip-up release mechanism tubes and those are even smaller diameter than the aileron push rids. .
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04-02-2018, 01:55 PM
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Join Date: Mar 2017
Location: Birmingham, Alabama
Posts: 1,643
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I got them done by carefully drilling a tiny pilot hole with a hand drill and then using the drill press to finish. The fully drilled through pilot hole was enough to keep everything on track.
I like the welding idea lol 
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RV-14A #140376
N196 (Flying)
2019 Bronze Lindy
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04-02-2018, 02:38 PM
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Join Date: Jan 2010
Location: Southern Michigan
Posts: 1,966
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Center drills work wonders for stuff like this. And don't buy the cheap China crappy ones!
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David C.
Howell, MI
RV-10: #41686 Under Construction
RV-9A: #90949 Under Construction
RV-10: #40637 Completed/Sold 2016
Cozy MKIV:#656 Completed/Sold 2007
"Donor Exempt" but donated through Dec. 2020
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04-02-2018, 03:42 PM
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Join Date: Oct 2017
Location: Las Vegas, NV
Posts: 407
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Holes on tube
I have had luck drilling holes on tube by filing a flat into it first, then center punch the flat, and drill. Just keep the flat area smaller then the hole so that when you upsize the hole, the flat disappears.
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Tom
Las Vegas
RV-8 empenage almost finished
Horizontal Stab done! 2-15-2020
Vertical Stab Done! 5-27-2020
Rudder Done! 5-31-2020
Wings ordered!...
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04-02-2018, 09:23 PM
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Join Date: Jan 2005
Location: San Antonio, TX
Posts: 1,024
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If you are still having trouble drilling those i have two suggestions you can try
Make sure the v block is in exactly the right place by putting the drill bit down all the way to verify it is touching the center of the v to insure it is perpendicular.
Also, You can make a saddle out of a piece of scrap tubing with a drilled hole in it. Place the saddle on the tube with the hole over the spot you want to drill and it will keep your bit from wandering. You can clamp the saddle on or make it big enough to just hold it in place till you get the bit started
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Steve Formhals
A&P, Tech Counselor & Flight Advisor
RV3B
RV8
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04-03-2018, 06:02 AM
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Join Date: Oct 2005
Location: 08A
Posts: 9,500
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Make a tool...

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Dan Horton
RV-8 SS
Barrett IO-390
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04-03-2018, 07:22 AM
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Join Date: Mar 2017
Location: Birmingham, Alabama
Posts: 1,643
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I got mine drilled using a pilot hole instead of a punch .. but keep the suggestions coming this is all great stuff!!!
__________________
RV-14A #140376
N196 (Flying)
2019 Bronze Lindy
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