Quote:
Originally Posted by Tomzhawaii
Is that 316 stainless?
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I ordered 4 12 foot bars of this stuff for a project at work and it was the off fall from that project.
Now that I looked it up it is 6061 "aircraft grade" aluminum.
My fastener choices were 1/2x20 TPI bolts and 5/16 18 TPI Allen head fasteners.
The fine thread may be over the top but fine threads have more tinsel strength.
Each hole in steps.
Scribe lines.
Center punch at intersection of lines.
Place on drill press and center drill.
Drill small pilot holes.
Worked my way up to the F size drill for the 1/16 18 TPI fasteners.
Counter bored and finished bore for the fastener head with a reamer.
On the 1/2 20 TPI I continued on to the final tapping size of 29/64.
Started my taps in the drill press to make sure they are square and then finish by hand.
Lots of taking apart and putting back together before final drilling and assembly.
I only had one shot at it and it is very rigid.