Mikeyb
Well Known Member
I put the wings on my plane today. I’m a hazard with a hand drill and would have died of a heart attack if I would have messed up the hole that attaches the rear spar
I made a little drill jig. It’s just a piece of 1X2.75X.5” aluminum bar with a .500” hole bored in the middle to hold removable drill bushings I bought from McMaster.
I clamped them in place when I was setting the incidence. It’s easy to judge the edge distance. As long there is an 1/8” of material above and below the bar you are good.
I stepped the hole size up from #30 to an N drill and bushings then reamed it to 5/16. Nice round hole that is square to the spar fittings.
I made a little drill jig. It’s just a piece of 1X2.75X.5” aluminum bar with a .500” hole bored in the middle to hold removable drill bushings I bought from McMaster.
I clamped them in place when I was setting the incidence. It’s easy to judge the edge distance. As long there is an 1/8” of material above and below the bar you are good.
I stepped the hole size up from #30 to an N drill and bushings then reamed it to 5/16. Nice round hole that is square to the spar fittings.