plhamilton
Member
I have commenced working on the Rudder and I am wondering about the edge distance for the parts R-1003 and R-1004. I had completed all the skin drilling and was about to start final deburing before dimpling.
Photo 1
The first photo is the spar end of R-1003A. The hole has been final drilled to #30. I have shaved off most of the joiner to the R-1003-B piece, but not all of it, there is a very small quantity of it remaining which you can see. You can also see the roughness of the edge in this photo. When I measure the edge distance from the edge of the hole to the original edge (not one cut down by me, it is only about 0.132" which is way less than the 0.1875" required for a 1/8th rivet hole. So from where I sit, the manufacture of this part must be wrong, either that or my understanding of edge distance is incorrect. Can anyone confirm this for me.
Photo 2
The second image is the R-1004A part which has been drilled to match the Rudder Horn. The edge distance for the hole closest to the rear spar is 0.168 which is again to small. When I was originally working on the R-1004B piece, I had made a mistake and had to order a replacement. This meant that I had access to a pristine R-1004A part, so I clecoed it up to the Rudder horn and drilled it.
Photo 3
The third photo is that part, you can see the original joiners have not been removed. I drilled this part to test whether I had made a mistake, and lo and behold, the edge distance is only 0.1675". Again this is below my expectation of 2D (2X.125=.25) from the centre of the hole or .1875" from the edge of the hole.
I can only think that I am making a mistake here, but it certainly isnt the measurements as I have checked them over a number of times. It would also be pretty difficult to drill the R-1004-A part incorrectly as the Rudder Horn makes a substantial drill jig...
Photo 1
The first photo is the spar end of R-1003A. The hole has been final drilled to #30. I have shaved off most of the joiner to the R-1003-B piece, but not all of it, there is a very small quantity of it remaining which you can see. You can also see the roughness of the edge in this photo. When I measure the edge distance from the edge of the hole to the original edge (not one cut down by me, it is only about 0.132" which is way less than the 0.1875" required for a 1/8th rivet hole. So from where I sit, the manufacture of this part must be wrong, either that or my understanding of edge distance is incorrect. Can anyone confirm this for me.
Photo 2
The second image is the R-1004A part which has been drilled to match the Rudder Horn. The edge distance for the hole closest to the rear spar is 0.168 which is again to small. When I was originally working on the R-1004B piece, I had made a mistake and had to order a replacement. This meant that I had access to a pristine R-1004A part, so I clecoed it up to the Rudder horn and drilled it.
Photo 3
The third photo is that part, you can see the original joiners have not been removed. I drilled this part to test whether I had made a mistake, and lo and behold, the edge distance is only 0.1675". Again this is below my expectation of 2D (2X.125=.25) from the centre of the hole or .1875" from the edge of the hole.
I can only think that I am making a mistake here, but it certainly isnt the measurements as I have checked them over a number of times. It would also be pretty difficult to drill the R-1004-A part incorrectly as the Rudder Horn makes a substantial drill jig...