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  #11  
Old 10-12-2021, 06:29 AM
ravenstar ravenstar is offline
 
Join Date: May 2021
Location: New Hampshire
Posts: 24
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Quote:
Originally Posted by RFSchaller View Post
I canít remember this part. Itís been almost 9 years since I finished my build, but hereís a stupid question: which way is the angle pointing, toward or away from the viewer? Isometric drawings can be confusing. Check the context in which the part is to be used to be sure ou have the correct side to countersink.
Not at all a dumb question. I can stare at the rib drawings and watch them alternate between pointing into and out of the page like some of the optical illusions in my old college psychology texts.

In this case, the sides are bent towards us, and this piece nests inside another angle. I used the countersink bit in the hand deburring tool to make the countersink, and it worked great! I've since used it to clean up a couple of machine countersinked holes that were off by a couple thousandths.

Now, getting the rivets to stay put while I squeezed them, that's another story. Let's just say I got lots of experience drilling out rivets between this and the nut plates on the vertical stabilizer rear spar. To digress, however, it's really refreshing doing a project with no deadlines in which taking time to fix problems doesn't put you behind a schedule.
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  #12  
Old 10-12-2021, 07:00 AM
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Piper J3 Piper J3 is offline
 
Join Date: Nov 2014
Location: Hinckley, Ohio
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Quote:
Originally Posted by ravenstar View Post
Now, getting the rivets to stay put while I squeezed them, that's another story. Let's just say I got lots of experience drilling out rivets between this and the nut plates on the vertical stabilizer rear spar. To digress, however, it's really refreshing doing a project with no deadlines in which taking time to fix problems doesn't put you behind a schedule.
Take a small piece of sheet cork (maybe 1/8" thickness) and place on shop-side of rivet. As you start to squeeze the cork will draw up the assembly before the rivet starts to deform. The cork will split and move out of the way to allow final compression.
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Jim Stricker - EAA #499867
PPL/ASEL 1970 - Sport Pilot since 2007
80 hrs Flying Aeronca Chief 11AC N86203
1130 hrs Flying 46 Piper J-3 Cub N6841H
Bought Flying RV-12 #120058 Oct 2015 with 48TT - Hobbs now 735

LSRM-A Certificate 2016 for RV-12 N633CM
Special Thanks... EJ Trucks - USN Crew Chief A-4 Skyhawk
MJ Stricker (Father - CFI) - USAAF 1st Lt. Captain B-17H
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  #13  
Old 10-12-2021, 04:22 PM
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Draker Draker is offline
 
Join Date: Jun 2016
Location: Livermore, CA
Posts: 536
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It maybe goes without saying but when countersinking without a cage or drill stop, be careful to not countersink too deep. Even when doing it by hand, a very sharp bit can suddenly dig a countersink deeper than you expect. Ask me how I know.
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Ryan Drake
Livermore, CA
https://stiletto.smugmug.com/RV7
Donated 12/31/2020
RV-7A (N12VD): Everything done that can be done at home. Waiting for hangar to finish up.
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  #14  
Old 10-12-2021, 09:00 PM
RFSchaller RFSchaller is offline
 
Join Date: Oct 2010
Location: Phoenix, AZ
Posts: 3,146
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Hereís some heresy sure to draw some abuse for me:

If you canít get a countersink bit in there try a drill bit with a ver light touch
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