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!
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!