I here of people who dimple the pre drilled holes without expanding the slightly undersized hole as the dimple dye expands the hole anyway. Obvoiulsy, would not use this everywhere but if structure-worthy could save alot of time if deburred well.
Any thoughts? rv8doc@hotmail.com
Use a 10x or greater magnifyer and I believe you will find that you will get cracks if you don't make the hole big enough. No maybe about it.
__________________
H. Evan's RV-7A N17HH 240+ hours
"We can lift ourselves out of ignorance, we can find ourselves as creatures of excellence and intelligence and skill. We can be free! We can learn to fly!" -J.L. Seagull
Paid $25.00 "dues" net of PayPal cost for 2015, 2016, 2017 and 2018 (December).
This airplane is for sale: see website. my website
In fact, the hole is not pre-drilled, it is pre-punched. Drilling is necessary to remove the work-hardened and torn edges crerated by the action of the punch as it rips the center out of the hole.
__________________ Dave ColeRV-7 N97DC reserved dave.cole@cox.net
Started SB April 2004
Hope to fly in 2011
Dimple without expanding hole?
CJ
Linear Mode
