When I started on my -7, I was taught that the reason we final drill all the holes is that the punching process can leave micro-cracks on the edge of the holes which can propagate over time. Drilling and deburring the holes fixes this problem and assures that you won't get cracks starting to spread from around your rivets.
Now, if I understand correctly, on the -12, all of the holes are punched to size and you just fill 'em up with rivets. Why is it that drilling out the holes is no longer needed?
I'd appreciate it if someone can enlighten me.
Thanks!
Now, if I understand correctly, on the -12, all of the holes are punched to size and you just fill 'em up with rivets. Why is it that drilling out the holes is no longer needed?
I'd appreciate it if someone can enlighten me.
Thanks!