[ssisca]

Here is a silly question...If the inside of the skins are being cleaned and scrubbed with scotch bright pads in prep for prime, do the holes on the inside of the skin also need to be deburred? That's what I have been doing, but it seems like its overkill?

 

[Phil]

You're doing the correct thing.

It's pretty much a given that any sharp 90 degree turn is bad. Doesn't matter if it's the edge of a thick doubler or the inside edge of a very cleanly drilled hole.

Even though there isn't a burr and the hole is absolutely perfect, it's also got an absolutely perfect 90 degree angle.

Just use 1.5 - 2 turns. It's just enough to knock that 90 degree sharp edge off. If there are actually burrs hanging onto the hole, you might need to give it another twist or so...

But that's the reason.

Phil

 

[lorne green]

deburring

snip...If the inside of the skins are being cleaned and scrubbed with scotch bright pads in prep for prime, do the holes on the inside of the skin also need to be deburred?

Of course by scrubbing over drilled holes (in a deliberate atempt) to deburr the inside skins you, in essance are deburring. One sure test is to rub the tips of your fingers over the deburred (scrubbed) holes. If you feel any roughness or "risers"...a little more scrubbing (or deburring) is required. Deburr the outside skin as normal. The idea is not to remove material, just to knock off the burr.