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01-16-2022, 06:09 AM
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Join Date: Jan 2020
Location: Edgewood, KY
Posts: 35
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Reverse countersink tool - very cool !
Anyway, countersinking without a microstop be very careful with the single flute cutters they will dig in quickly. 3 flute cutters are a little more gentle. This would assume working with a drill and eyeballing depth…
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BravoAlphaRomeo
172N 180HP
RV14A - under construction
Dues paid
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01-16-2022, 06:13 AM
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Join Date: Mar 2005
Location: Dallas area
Posts: 11,386
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Quote:
Originally Posted by rolf
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Just be sure, when ordering, that you pay attention to the countersink angle. Aviation hardware is typically 100°.
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Mel Asberry, DAR since the last century. Over 1,000 certifications accomplished. Discount for Veterans, Law Enforcement, Fire Fighters.
EAA Flight Advisor/Tech Counselor, Friend of the RV-1
Recipient of Tony Bingelis Award and Wright Brothers Master Pilot Award
USAF Vet, High School E-LSA Project Mentor.
RV-6 Flying since 1993 (sold)
<rvmel(at)icloud.com>
Last edited by Mel : 01-17-2022 at 07:29 PM.
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01-16-2022, 02:12 PM
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Join Date: Aug 2021
Location: California
Posts: 33
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I’m fortunate to have a couple RV-6 and 7 builders at my field to get tips and tool tricks from.
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01-16-2022, 03:23 PM
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Join Date: Oct 2005
Location: Estes Park, CO
Posts: 5,102
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1/4-28
The countersink cutters are threaded 1/4-28 just like the threaded bits and deburring tools.
Fits a threaded bit extension or the 90 degree adapter or the speed deburring handle.
I also ran a die over the shaft of my 90 degree adapter so it also fits the speed deburring handle. So many options.
https://drive.google.com/file/d/0B7h...CjF_k4OrKfi3kA
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Larry Larson
Estes Park, CO
wirejock at yahoo dot com
Donated 12/01/2021, plus a little extra.
RV-7A #73391, N511RV reserved (3,000+ hours)
Empennage, wings, fuse, finishing kit done. Working FWF
Disclaimer
I cannot be, nor will I be, held responsible if you try to do the same things I do and it does not work and/or causes you loss, injury, or even death in the process.
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01-16-2022, 06:18 PM
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Join Date: Sep 2007
Location: Central IL
Posts: 6,518
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Quote:
Originally Posted by BravoAlphaRomeo
Reverse countersink tool - very cool !
Anyway, countersinking without a microstop be very careful with the single flute cutters they will dig in quickly. 3 flute cutters are a little more gentle. This would assume working with a drill and eyeballing depth…
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Easy enough to do, with a few practice holes on scrap. Just look at the diameter of the test pieces. The single flute will not chatter, unlike the multi cutter types.
Hand cutting is the least risky, just don't get in a hurry, unless you have a hundred to do. Then make a buy or make a tool. $$$ beats labor hours.
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Bill
RV-7
Last edited by BillL : 01-16-2022 at 06:20 PM.
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01-17-2022, 07:06 PM
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Join Date: Mar 2007
Location: Sonoma County
Posts: 4,337
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Quote:
Originally Posted by Mel
Just be sure, when ordering, that you pay attention to the countersink angle. Aviation hardware is typically 50°.
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I would use a 100 degree countersink for 426 rivets. What would use a 50 degree. C/S for?
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VAF #897 Warren Moretti
2021 =VAF= Dues PAID
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01-17-2022, 07:28 PM
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Join Date: Mar 2005
Location: Dallas area
Posts: 11,386
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Quote:
Originally Posted by gasman
I would use a 100 degree countersink for 426 rivets. What would use a 50 degree. C/S for?
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My "fat finger" mistake. I meant 100° of course.
__________________
Mel Asberry, DAR since the last century. Over 1,000 certifications accomplished. Discount for Veterans, Law Enforcement, Fire Fighters.
EAA Flight Advisor/Tech Counselor, Friend of the RV-1
Recipient of Tony Bingelis Award and Wright Brothers Master Pilot Award
USAF Vet, High School E-LSA Project Mentor.
RV-6 Flying since 1993 (sold)
<rvmel(at)icloud.com>
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01-19-2022, 06:30 PM
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Join Date: Dec 2009
Location: Montreal
Posts: 1,554
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Quote:
Originally Posted by rolf
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Dang I got some of those at an auction with a bunch of other stuff and never knew what they were! Thanks!!
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Scott Black
Old school simple VFR RV 4, O-320, wood prop, MGL iEfis Lite
VAF dues 2021
Instagram @sblack2154
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01-21-2022, 10:25 AM
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Join Date: Feb 2007
Location: SLC, UT
Posts: 82
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My field-expedient answer to a 1/4-28 drill shank adapter - if you have a dogleg deburring tool, the coupler sleeve on the end is internally threaded and can be chucked in a 3/8 drill. It worked once, but for the money the adapters that Flyhud linked above would be better IMO. Yardstore also has a 1/4 hex shank adapter if you like.
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Scott K
KU42 / RV-9A [Wings]
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