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  #11  
Old 05-20-2022, 05:19 AM
georgemohr georgemohr is offline
 
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Location: Ewing Township
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Hi all, thanks for the feedback. I think I'm on the right track with these countersinks so I'm going to build on! I have a digital calipers so I'll use them to get the hole to the max OD spec and roll with it.
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  #12  
Old 05-20-2022, 08:17 AM
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rvbuilder2002 rvbuilder2002 is offline
 
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Quote:
Originally Posted by gotyoke View Post
I think nearly every reply missed the point entirely. In the plans we are told the maximum dimensions of these particular holes, not a general rule like "countersink for a dimpled skin", which is where the 0.007" would apply. The OP is almost at the limit and sees a significant gap. In other words, the skin is not going to sit anything approaching flush with the spar like it normally would in most cases, and that is the main concern.
You are correct that the .007 rule of thumb doesn't apply to countersinks for screw dimples but the principle for why there is a specific limit and not a statement of "cut until the dimpled skin lays flush" is the same.
Bottom line is, that the dimension limit is given for a reason, whether it be .007 deeper or a specific maximum cut diameter, and it sounds like the OP has resolved to use that as a guide.

As a side note, the quality / crispness of the dimple is a large factor in how flush a skin appears to lay when a dimple and countersink (or even two dimples) are involved. This becomes even more pronounced in cases of larger dimples for screws. I believe many builders have been fooled by this in the past, and pressed on making their countersinks deeper and deeper in an attempt to get a flush fit, only to destroy their spar in the process.
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  #13  
Old 05-20-2022, 09:03 AM
MJarreau MJarreau is offline
 
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Location: LA (Lower Alabama)
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Quote:
Originally Posted by rvbuilder2002 View Post
Lots of info and the photos you mentioned here

https://vansairforce.net/community/s...d.php?t=159343
Thanks for the link, Scott.

Was the whole point of the OP to say the gap between the skins and the countersink was too large? That's what I thought. If not, please explain for my education.

Cheers!
Mike
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  #14  
Old 05-20-2022, 09:13 AM
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wirejock wirejock is online now
 
Join Date: Oct 2005
Location: Estes Park, CO
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Default Nutplate

Did Vans switch to #6 nutplates. I seem to remember #8 on the 7 wings. Big difference in dimensions.
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  #15  
Old 05-20-2022, 11:00 AM
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rvbuilder2002 rvbuilder2002 is offline
 
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Wings use #8 for all areas except for the fwd edge of access covers.
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  #16  
Old 05-20-2022, 06:03 PM
georgemohr georgemohr is offline
 
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Quote:
Originally Posted by rvbuilder2002 View Post
Wings use #8 for all areas except for the fwd edge of access covers.
Right, and the #8 are back ordered so Iím working with what Iíve got
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