afstruct
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I know the drill bits you're discussing, I've used them in a Desoutter right angle pneumatic drill. Pain in the butt.
Also used a really weird little tool that that looked sort of like a box ratchet, with a 1/4" shank at one end (attached to an air drill) and the other end had a threaded recess for screwing in a special L/H 1/4" drill bit about 20mm long. The drill bit pointed back towards the user.
The 'box ratchet' was about 100mm long and had a gear train inside, why it required a L/H drill.
It was used to remove the remnants of a broken spigot of a Delrin bumper pad on the backside of a B737 cargo door handle.
@afstruct does this relate to airframe structures?
Yeah , used those ( but for the life of me can't remember what we called them ).
Yeah we had a couple of different length ones that went in a normal drill.
Also ones that could only be used with their own special pneumatic drill. Had a few of these drills with different length drive shafts and different length box ratchet part.
Haven't done much work on B737s but definitely sounds like something we'd do .
I've found that in the commercial aviation world virtually all mechs and LAMEs don't want to know anything about metal work/composite work and repairs .
Why there's a TAFE cert 4 course ( is a trade ) for AME engineer Structures.
When I started it was really only metalwork. My original trade papers say Aircraft Sheetmetal Worker 1st class.
But now as structures you're qualified for composite work and able to do a lot of the mech work as well but at most places you're usually so busy with metal and composite work.