I finished deburring and dimpling the HS skins this weekend, and started countersinking the spar flanges where they will accept the dimples. It’s challenging getting a perfect countersink. The goal is to have the top of a rivet be 0.007 inches below flush. Even with a well calibrated countersink, just the slightest hand pressure difference can result in a different amount. I contemplated setting up the drill press, but opted for the hand drill where I can more easily feel what’s happening. The drill press would also be a little awkward given how long the spars are (10 feet). Everything came out ok so far, I’ve finished around 50 of ~400 holes. Once I’m done countersinking I’ll also prime the inside of these holes, as they will be contacting the skins.
Sounds a bit challenging, just as well you are so particular. How long do you think it will take to do all 400?
Lv M
Probably a couple more evenings, somewhere are two hours.