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07-09-2019, 08:56 AM
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Join Date: Jul 2005
Location: Detroit, MI
Posts: 1,587
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Best way to drill .505" hole for antenna?
My plan right now is to use a step drill that goes up to 1/2" and just over-do it a bit, by hand.
Is there a better way?
13mm drill bit? (.512")
I have done this once before but I've forgotten how I did it.
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H. Evan's RV-7A N17HH 240+ hours
"We can lift ourselves out of ignorance, we can find ourselves as creatures of excellence and intelligence and skill. We can be free! We can learn to fly!" -J.L. Seagull
Paid $25.00 "dues" net of PayPal cost for 2015, 2016, 2017 and 2018 (December).
This airplane is for sale: see website. my website
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07-09-2019, 09:11 AM
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Join Date: Jan 2005
Location: Tampa, FL
Posts: 2,861
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I'd use the step to .5 and then file it to final size because those are the tools I have.
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Todd "I drink and know things" Stovall
PP ASEL-IA
RV-10 N728TT - Flying!
WAR EAGLE!
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07-09-2019, 09:46 AM
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Join Date: Jul 2005
Posts: 1,341
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drill to 0.5" with step drill and take a couple thou off with the dogleg deburring tool, if you have one. Otherwise some abrasive cloth or file.
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Mike W
Venice, FL
RV-6A. Mattituck TMX O-360, FP, GRT Sport EFIS, L3 Lynx NGT-9000
N164WM
N184WM reserved (RV-8)....finishing kit in progress. Titan IOX-370
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07-09-2019, 10:05 AM
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Join Date: Dec 2009
Location: Boulder, CO
Posts: 4,428
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What Mike said.
Dave
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07-09-2019, 11:50 AM
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Join Date: Mar 2009
Location: Plano, TX
Posts: 2,088
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Quote:
Originally Posted by fl-mike
drill to 0.5" with step drill and take a couple thou off with the dogleg deburring tool, if you have one. Otherwise some abrasive cloth or file.
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Same here!
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Colin P.
RV-6A #20603
Complete 5/10/19
PP SEL / A&P
I donate every year on my B-Day (in Dec), but donated early in Sep'19.
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07-09-2019, 12:11 PM
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Join Date: Mar 2016
Location: Kalkaska, MI
Posts: 6
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Maybe I'm just sloppy with the stepdrill, but I usually get some slight deformation when I use it.
I found the rotacut tool did a cleaner job because it has a center guide and little pressure is required. Then I use a deburr tool to go up slightly if needed.
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07-09-2019, 02:17 PM
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Join Date: Jul 2005
Location: Detroit, MI
Posts: 1,587
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Got it. THANKS.
I think the step drill plus a little finesse with a deburring tool sounds good and I do have one or two!
Thanks to all.
__________________
H. Evan's RV-7A N17HH 240+ hours
"We can lift ourselves out of ignorance, we can find ourselves as creatures of excellence and intelligence and skill. We can be free! We can learn to fly!" -J.L. Seagull
Paid $25.00 "dues" net of PayPal cost for 2015, 2016, 2017 and 2018 (December).
This airplane is for sale: see website. my website
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07-10-2019, 09:40 AM
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Join Date: Jun 2007
Location: new iberia la
Posts: 765
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Upsizing
I have a tapered hand reamer that I use a lot for tasks like this.
Don Broussard
RV9 Rebuild in Progress
57 Pacer
A&P-IA-ATP
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07-10-2019, 10:45 AM
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Join Date: Feb 2012
Location: Leesburg, VA
Posts: 550
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Rota cutters
I don't know why these cutters are not a more common tool amongst builders.
They cut a perfect hole in sheet metal. No distortion.
https://www.mrmtool.com/Hougen-11075...Kit_p_755.html
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Jim
Leesburg, VA (KJYO)
RV4 N444JT (  sold)
RV8 N37PK
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07-10-2019, 05:12 PM
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Join Date: Dec 2007
Location: Fredericksburg, TX
Posts: 662
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.5 step drill with #2 wobble
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Jim Averett
RV-8
TS36 - Silver Wings
Fredericksburg, TX
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