Here is my problem.
Internally Peening of a 2014-T61 Aluminum aircraft Part.
Part is threaded internally with a 6" I.D. modified buttress thread and peened after threading to .007A2 - .009A2 using S-110 Shot.
Then the tops of the threads are machined off (Truncated) creating a flat which is approximately .075" wide.
The problem is that the truncating operation leaves a very small burr that creates an interference with the mating nut.
Found that using a 3M Radial Bristle Disc 3" x 220 grit or Weiler 4" x .022/320 grit NFA Brush removes the burr and in doing so does remove a very minor amount of material on the peened threads. Under10X, Peened dimples are still very visible .
I have not taken any dimensional measurements, but feel that I have not removed more than 10% of the intensity.
My question is will lightly polishing a peened surface alter the positive effects of peening?
