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Date:  11-20-2022
Number of Hours:  5.00
Manual Reference:  
Brief Description:  Deburr and Dimple Parts, Match Drill Tube

Continuing the drilling of the counterbalance tube. Using my drilling guide tool I was able to drill the tube without much problem. The guide kept the #40 drill bit perpendicular to the tube and it wasn't much trouble to drill thru without having the drill walk on me and mess up the holes in the aluminum skin. I switched to a #27 bit and final drilled one of the holes before I realized I should have used a #30 bit for final size. I finished drilling out the nose skin/tube holes without problems.

You're supposed to use a LP4 rivet for the nose/tube holes and I was a bit concerned that the rivet wouldn't fill the larger hole properly when pulled. I took a piece of 0.020 in. scrap, drilled a #27 hole and squeezed a LP4 in it. Looks like that rivet will fill the extra space and without a problem, so no fixes need be applied here. It's just the one hole.

I finished deburring all of the rest of the parts (skins, ribs, stiffeners, spar) and dimpled everything that needed it. I partially assembled the skins and spar to positively identify the correct orientation (OML/IML). Rivets were loaded in the holes and prepped for back riveting tomorrow.

Before I can assemble everything I need to deburr the inside of the tube holes. My deburring tool has a blade that if you hold it just at the right angle you can scrape the interior surface, but it's hard to use and gives mediocre results. New blades will arrive Tuesday that are specifically made for deburring the far side, so I'll wait for them to arrive.
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After final drill to #30, the skin holes cleaned up nicely.  Just a hint of slotting on one of them.

After final drill to #30, the skin holes cleaned up nicely. Just a hint of slotting on one of them.

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Partial assembly to make sure which is IML/OML side of the skins

Partial assembly to make sure which is IML/OML side of the skins

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Skins dimpled and rivets loaded for back riveting

Skins dimpled and rivets loaded for back riveting

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