jamcgee1978
Active Member
Afternoon all,
So after making good progress on the vertical stab on the RV10 I have come upon my first of many issues, in relation to countersinking on the Vertical Stab 6-4 Step 2 . The plans call for you to machine countersink 4 holes on the front spar doubler and dimple the corresponding holes on the front spar in prep to accept a AN426 AD4.
In the manual it states:
"a skin riveted onto a machine countersunk surface the countersink must be slightly deeper as mentioned earlier.Proper depth is .007 deeper than when the rivet head is flush. "
So despite doing this on the 3/32 holes with no issue i am unable to get the CS holes to accept the dimples without in my opinion over countersinking the holes. i guess iam asking how much material should you take away. Im using a std 1/8 CS 100 degree and similar dimple die set but for some reason i cannot get the two skins to match together and can see slight daylight between them. I asked my inspector to have a look this evening and he agrees the holes are over countersunk but agrees they still are not accepting the dimples? Issue with my die set or CS?
I carried this out on scrap beforehand and was unable to get the 2 pieces to be flush, am asking for advice as although this is early doors in the process i ultimately want to iron out common builder issues early as CS successfully is going to be crucial to the success of the project.
little steps and all!
![](/proxy.php?image=http%3A%2F%2Fi513.photobucket.com%2Falbums%2Ft332%2Fjamcgee11%2F2017-03-02%252020.32.03_zpsmbdn2ymq.jpg&hash=5d43f39a0a9e15fb4857c0169d160cc6)
![](/proxy.php?image=http%3A%2F%2Fi513.photobucket.com%2Falbums%2Ft332%2Fjamcgee11%2F2017-03-02%252020.33.27_zpsr0rdj7hg.jpg&hash=c949a12b47d19ae10d6487232a946362)
![](/proxy.php?image=http%3A%2F%2Fi513.photobucket.com%2Falbums%2Ft332%2Fjamcgee11%2F2017-03-02%252020.32.22_zpspjacykf2.jpg&hash=98358b500033dd4b319e217810e5013d)
So after making good progress on the vertical stab on the RV10 I have come upon my first of many issues, in relation to countersinking on the Vertical Stab 6-4 Step 2 . The plans call for you to machine countersink 4 holes on the front spar doubler and dimple the corresponding holes on the front spar in prep to accept a AN426 AD4.
In the manual it states:
"a skin riveted onto a machine countersunk surface the countersink must be slightly deeper as mentioned earlier.Proper depth is .007 deeper than when the rivet head is flush. "
So despite doing this on the 3/32 holes with no issue i am unable to get the CS holes to accept the dimples without in my opinion over countersinking the holes. i guess iam asking how much material should you take away. Im using a std 1/8 CS 100 degree and similar dimple die set but for some reason i cannot get the two skins to match together and can see slight daylight between them. I asked my inspector to have a look this evening and he agrees the holes are over countersunk but agrees they still are not accepting the dimples? Issue with my die set or CS?
I carried this out on scrap beforehand and was unable to get the 2 pieces to be flush, am asking for advice as although this is early doors in the process i ultimately want to iron out common builder issues early as CS successfully is going to be crucial to the success of the project.
little steps and all!
![](/proxy.php?image=http%3A%2F%2Fi513.photobucket.com%2Falbums%2Ft332%2Fjamcgee11%2F2017-03-02%252020.32.03_zpsmbdn2ymq.jpg&hash=5d43f39a0a9e15fb4857c0169d160cc6)
![](/proxy.php?image=http%3A%2F%2Fi513.photobucket.com%2Falbums%2Ft332%2Fjamcgee11%2F2017-03-02%252020.33.27_zpsr0rdj7hg.jpg&hash=c949a12b47d19ae10d6487232a946362)
![](/proxy.php?image=http%3A%2F%2Fi513.photobucket.com%2Falbums%2Ft332%2Fjamcgee11%2F2017-03-02%252020.32.22_zpspjacykf2.jpg&hash=98358b500033dd4b319e217810e5013d)