Preparing to preform SB 16-03-28 on my pre-SB QB RV-14 wings as I begin this phase of construction. The SB requires drilling out 16 AN470AD4-5 rivets attaching the inboard aileron hinge brackets to the rear spar. I’ve put 24 similar rivets in a couple pieces of scrap totaling nearly the same thickness. As you can see from the attached pic, I can’t put my rivet removal tool on the rivet heads in proper perpendicular position. Therefore, I’m not using the tool for my practice. However, since the rivets on the wings still have nice dimples in their heads, I did use the tool to make centered dimples in the practice rivets. I’ve decided that I’m not going to attempt removing those 16 rivets on the wings until I can remove 24 practice rivets in a row without any elongated holes.
In the first four rivets I’ve removed, the holes I’ve drilled in the heads have all gone off center after starting centered. I’m having to use a 5-1/4” drill bit because that is what I’ll need to clear the hinge bracket. I might be putting a bit of pressure on the drill and causing the bit to flex a little and wander off center. But, suspecting that, I was very careful on the fourth practice rivet not to use anything but the slightest pressure and still ended up with an off-center hole for removing the head. That also starts me off center drilling with the #40 bit to drill out the shank.
I’d like to hear what some of you do to keep your holes centered when drilling out universal rivets.
All this being said, I DID use my rivet removal tool at about a 3-4° “angle of attack” on the fifth practice rivet. It was actually the best of all five and my starting point for drilling out the shank was the most centered of all five. Leads me to believe that maybe I SHOULD use the tool for drilling the heads of the “real” rivets.
Also, all five drilled out holes were at least what I would consider minimally satisfactory, the worst of them being only very slightly enlongated. I just wouldn’t want more than 2-3 per side like that.
In the first four rivets I’ve removed, the holes I’ve drilled in the heads have all gone off center after starting centered. I’m having to use a 5-1/4” drill bit because that is what I’ll need to clear the hinge bracket. I might be putting a bit of pressure on the drill and causing the bit to flex a little and wander off center. But, suspecting that, I was very careful on the fourth practice rivet not to use anything but the slightest pressure and still ended up with an off-center hole for removing the head. That also starts me off center drilling with the #40 bit to drill out the shank.
I’d like to hear what some of you do to keep your holes centered when drilling out universal rivets.
All this being said, I DID use my rivet removal tool at about a 3-4° “angle of attack” on the fifth practice rivet. It was actually the best of all five and my starting point for drilling out the shank was the most centered of all five. Leads me to believe that maybe I SHOULD use the tool for drilling the heads of the “real” rivets.
Also, all five drilled out holes were at least what I would consider minimally satisfactory, the worst of them being only very slightly enlongated. I just wouldn’t want more than 2-3 per side like that.