Flush blind rivets
Posted: Sun May 01, 2016 8:22 amFirst off....sorry for coming to the Sonex forums even though I'm currently battling a Waiex for air supremacy. I'm told that most everything forward of the tail is common to both and am hoping for a broader range of input.
I'm currently on page F-16 (Waiex plans) and trying to get my head wrapped around the -03 aft tunnel web assembly; more specifically, the countersinking and dimpling process shown in detail "B". I have both the 120 deg. countersink and dimple dies, and have used the dimple die with success during the stabilator build.
Since I'm not an engineer, some of the symbols on the prints are new to me, but can be interpreted fairly easily. The one I can't understand is the apparent hole diameter symbol that is associated with the countersink. It shows 1/4in. for an otherwise 1/8in. hole. I'm assuming this means the top of the countersink should be 1/4in. Please let me know if this is not correct. It might be where I've gone astray. That's what I used as a dimention on a test piece of 1/8in. thick material. Next, I dimpled some .032 test material "into" the countersink as called for on the print. So far so good. When I pulled a rivet in the assembly, the head was flush as you would expect, however there seemed to be less than satisfactory tension between the two componnents; meaning I could rotate the two pieces without danger of breaking the skin on my fingers. I tried many configurations using 100/120deg. tools in every combination I could think of, including pneumatic vs. manually pulled rivets, with the same result.
Is this normal for this attachment? I prepared a 100deg. test piece and drove a solid AN rivet into it. The joint could not be turned without the use of pliers. What, if anything, am I missing, or am I worrying about nothing? This seems a very critical component, being related to the spar, and I need to obviously get it right before moving on since this technique is used elsewhere.
There is also a "note" that warns against riveting the assembly together at this stage. It references pg. F-11 for further riveting information, but near as I can tell, the web assembly is complete before it gets used there. Does anyone have any intel as to why the web should or shouldn't be riveted at this stage?
I'm inclined to use AN rivets on this assembly, unless I can figure out what I'm doing wrong with the Cherry rivets, and it would be worlds easier to rivet it on the bench now rather than during the build-up of the forward fuselage.
Thanks for the ears.
Randy here.......stuck in the mud @Area 51%
I'm currently on page F-16 (Waiex plans) and trying to get my head wrapped around the -03 aft tunnel web assembly; more specifically, the countersinking and dimpling process shown in detail "B". I have both the 120 deg. countersink and dimple dies, and have used the dimple die with success during the stabilator build.
Since I'm not an engineer, some of the symbols on the prints are new to me, but can be interpreted fairly easily. The one I can't understand is the apparent hole diameter symbol that is associated with the countersink. It shows 1/4in. for an otherwise 1/8in. hole. I'm assuming this means the top of the countersink should be 1/4in. Please let me know if this is not correct. It might be where I've gone astray. That's what I used as a dimention on a test piece of 1/8in. thick material. Next, I dimpled some .032 test material "into" the countersink as called for on the print. So far so good. When I pulled a rivet in the assembly, the head was flush as you would expect, however there seemed to be less than satisfactory tension between the two componnents; meaning I could rotate the two pieces without danger of breaking the skin on my fingers. I tried many configurations using 100/120deg. tools in every combination I could think of, including pneumatic vs. manually pulled rivets, with the same result.
Is this normal for this attachment? I prepared a 100deg. test piece and drove a solid AN rivet into it. The joint could not be turned without the use of pliers. What, if anything, am I missing, or am I worrying about nothing? This seems a very critical component, being related to the spar, and I need to obviously get it right before moving on since this technique is used elsewhere.
There is also a "note" that warns against riveting the assembly together at this stage. It references pg. F-11 for further riveting information, but near as I can tell, the web assembly is complete before it gets used there. Does anyone have any intel as to why the web should or shouldn't be riveted at this stage?
I'm inclined to use AN rivets on this assembly, unless I can figure out what I'm doing wrong with the Cherry rivets, and it would be worlds easier to rivet it on the bench now rather than during the build-up of the forward fuselage.
Thanks for the ears.
Randy here.......stuck in the mud @Area 51%