If I've learned one thing watching high school refs attempt to work NFL games, it's that having hard-and-fast rules would be better than running to the sidelines before making every decision.
One such call that has been bugging me is how large a #40 needs to get before it's too big for an AN3 rivet. The answer I've received from Van's builder assistance and experienced builders is always "if it's too big, use a NAS1097 'oops' rivet...", which begs the question "what is too big?!"
I believe I have found an (the?) "official" answer from an engineering perspective, and I'm looking for validation from you guys. MIL-R-47196A(MI) has a table (TABLE 1) that shows the "Hole Diameter Limits".
This table indicates that 3/32 rivets (AN3's) can be properly used in a hole as large as .103". This means that an AN3 should certainly NOT be used in a hole that will accept a 7/64" (.1093") drill bit. I assume most people don't have #38 and #37 drills laying around, but to be the most precise, if the hole will NOT accept a #37 drill, you should be OK to drive the original rivet. Otherwise, drill #30 and use the NAS1097.
My only bit of doubt in this is that the table is titled "... Standard Rivets". I don't know if that term means that it only applies to 470s and there is a different term that means 426s, or if "Standard Rivets" include all solid aluminum rivets.
Did I get this right??
One such call that has been bugging me is how large a #40 needs to get before it's too big for an AN3 rivet. The answer I've received from Van's builder assistance and experienced builders is always "if it's too big, use a NAS1097 'oops' rivet...", which begs the question "what is too big?!"
I believe I have found an (the?) "official" answer from an engineering perspective, and I'm looking for validation from you guys. MIL-R-47196A(MI) has a table (TABLE 1) that shows the "Hole Diameter Limits".
This table indicates that 3/32 rivets (AN3's) can be properly used in a hole as large as .103". This means that an AN3 should certainly NOT be used in a hole that will accept a 7/64" (.1093") drill bit. I assume most people don't have #38 and #37 drills laying around, but to be the most precise, if the hole will NOT accept a #37 drill, you should be OK to drive the original rivet. Otherwise, drill #30 and use the NAS1097.
My only bit of doubt in this is that the table is titled "... Standard Rivets". I don't know if that term means that it only applies to 470s and there is a different term that means 426s, or if "Standard Rivets" include all solid aluminum rivets.
Did I get this right??