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Date:  7-29-2022
Number of Hours:  2.00
Manual Reference:  
Brief Description:  LH Spar Screw Hole Countersinking Problem

I ran into a problem on the LHS spar trying to countersink the #8 screw holes in the spar flange. The C/S bit is chattering badly and I'm not sure how to get it to behave. I tried experimenting on a test panel but so far I haven't figured it out. I tried one on the actual spar flange but it was almost as bad as the test panels. I didn't get near full depth, so I still have room left to get a good smooth surface.

Right after I ran into that issue, I was lucky? enough to get COVID and was out for about 10 days. I had absolutely no energy so mostly I slept. I'm almost 100% again so today was the first day I got back to work on the spar.

I put aside the LHS spar for the moment and decided to match drill the J-stiffeners on the RHS. I got into a pretty good rythym and finished a lot faster this time. I still have to roll the lower stiffeners to the upper flange to finish the match drilling. Upper stiffeners deburred and set aside for later.
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So far all of my trials have led to errors.  Can't figure out why my C/S is so bad all of a sudden.

So far all of my trials have led to errors. Can't figure out why my C/S is so bad all of a sudden.

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Fuel tank screw hole countersink looking pretty bad.  Not yet full depth though so I can save it.

Fuel tank screw hole countersink looking pretty bad. Not yet full depth though so I can save it.

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Started working on the RH spar

Started working on the RH spar

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