Guys, I'm coming to the crew for some recommendations.
I need a 10.3mm drill. I will be drilling a good number of holes into 6061-t6, 1.5" square tubing, 0.125" wall thickness. Holes will be through two opposing walls. I was looking for a drill that has a short flute (less than 1.250") and 10.3mm shank so that when I cut through the first hole the shank passes into the top hole and can help guide for the second cut to help reduce the risk of a triangle hole on the bottom side. All of my 10.3 drills are way longer and the flutes are sharp enough to cut the top hole if the drill walks or chatters, which is a no-go.
Any recommendations on this? I could run a spot drill into the top hole and spot the lower one, but that wastes time, so I would prefer to not do that. I will be spotting the top hole unless you guys have a recommendation on a drill that doesn't require it. I really just want to G81 that thing in and out, I'm looking at 4,200 holes so time is of the essence.
Figured some of you here would know better than a tooling rep that just wants to sell what they have.