It's starting to get cold in the hangar! I'm
finally grinding the slots in the main gear
to fit around the gear attach brackets on
Then I use a scotbright wheel to smooth it
I have to drill two 1/2" holes in this
aluminum angle just perfectly so that the
two studs fit! Not sure how to do that.
Here is how I drilled the holes with perfect
results: first I measured the OUTSIDE
distance of the two studs.
Your measurements might be different so be
sure to make your own, but mine came out at
Since each stud is 1/2" I need to subtract
1/4" from each stud to get to the middle.
So....subtract a total of 1/2". Here you can
see I subtracted 1/2".
I already had the centerline drawn on the
angle, so drew one line 20mm from the edge,
and then used the calipers to mark the other
line 5.7115 inches from the first line. I
VERY carefully drilled the #40 pilot holes.
NOTE: you must get the drill bit EXACTLY
on the crosshairs or everything will be off.
Take your time and just barely touch the
drillbit (in a drill press) to the metal to
see where the point leaves a mark. When it's
exactly on the crosshairs, drill away!
I drilled a #40 pilot hole, then a #30, and
then a #20 hole. Then I used the unibit to
drill up to 1/2".
It fit perfectly. I will note that I had to
run a 1/2" drill bit through the holes to
open them up a hair to fit over the threads.
I guess the 1/2" drill bit is ever so
slightly larger than the 1/2" unibit.
Next I just need to trim the angle 20mm
from the center of the other hole.
Now, before I did any drilling on the angles
shown above, I did the exact same drilling
procedure on a scrap piece of aluminum to
test the measurements and the technique.
I just need to build the tires/wheels and
I can finally get this plane on the gear and
off the workbench. That's exciting!!