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  #11  
Old 01-16-2022, 06:09 AM
BravoAlphaRomeo BravoAlphaRomeo is offline
 
Join Date: Jan 2020
Location: Edgewood, KY
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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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  #12  
Old 01-16-2022, 06:13 AM
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Mel Mel is online now
 
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Quote:
Originally Posted by rolf View Post
If you have access to the other side, you could use a reverse countersink tool.
Check https://www.mcmaster.com/reverse-countersinks/
Just be sure, when ordering, that you pay attention to the countersink angle. Aviation hardware is typically 100°.
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Last edited by Mel : 01-17-2022 at 07:29 PM.
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  #13  
Old 01-16-2022, 02:12 PM
RV-Ogler RV-Ogler is offline
 
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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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  #14  
Old 01-16-2022, 03:23 PM
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wirejock wirejock is offline
 
Join Date: Oct 2005
Location: Estes Park, CO
Posts: 5,102
Default 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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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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  #15  
Old 01-16-2022, 06:18 PM
BillL BillL is offline
 
Join Date: Sep 2007
Location: Central IL
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Quote:
Originally Posted by BravoAlphaRomeo View Post
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…
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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Last edited by BillL : 01-16-2022 at 06:20 PM.
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  #16  
Old 01-17-2022, 07:06 PM
gasman gasman is offline
 
Join Date: Mar 2007
Location: Sonoma County
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Quote:
Originally Posted by Mel View Post
Just be sure, when ordering, that you pay attention to the countersink angle. Aviation hardware is typically 50°.
I would use a 100 degree countersink for 426 rivets. What would use a 50 degree. C/S for?
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  #17  
Old 01-17-2022, 07:28 PM
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Mel Mel is online now
 
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Quote:
Originally Posted by gasman View Post
I would use a 100 degree countersink for 426 rivets. What would use a 50 degree. C/S for?
My "fat finger" mistake. I meant 100° of course.
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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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  #18  
Old 01-19-2022, 06:30 PM
sblack sblack is offline
 
Join Date: Dec 2009
Location: Montreal
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Quote:
Originally Posted by rolf View Post
If you have access to the other side, you could use a reverse countersink tool.
Check https://www.mcmaster.com/reverse-countersinks/
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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  #19  
Old 01-21-2022, 10:25 AM
ScottK ScottK is offline
 
Join Date: Feb 2007
Location: SLC, UT
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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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