Does anybody have a rule or ratio for counter sinking form threads? I know you need to sink a little more for form taps than cutting taps, but how much to keep the tap from pushing material above the top of the hole?
I'm thinking of using a 90deg tool because that would let me use the same tool I'll be using for chamfering/edge breaking.
If you need specifics I'm looking at 4-40 and 6-32 in 6061-T651. I'm guessing aluminium will push more material above the hole than something less ductile but please let me know different.
I've got a lot of holes to tap in these two sizes, so I'd like to get everything nailed down the first time if that's not horribly unrealistic .
MO
I'm thinking of using a 90deg tool because that would let me use the same tool I'll be using for chamfering/edge breaking.
If you need specifics I'm looking at 4-40 and 6-32 in 6061-T651. I'm guessing aluminium will push more material above the hole than something less ductile but please let me know different.
I've got a lot of holes to tap in these two sizes, so I'd like to get everything nailed down the first time if that's not horribly unrealistic .
MO