Re: Countersinking tips and tricks?
hy russ give a try to integral carbide tools ( attached )
hss are ok, they work, but ...
indexable carbide ? yup, but only if you need to use a large diameter tool
i use integral types: o4z4 o6z4 o10z6 ... 4000-6000rpm, 0.03 - 0.05mm/z, coolant, helical interpolation; integral tools have better tir, and lower diameter tools have a bigger chance to deliver a smoother surface / kindly
ps : for longer toollife spam, try to spread coolant all over their circumference; they are pretty fast, and if there is coolant lag, you may burn them if in doubts, get a non-coated version ... cheaper, but should serve you well
ps2 : if the countersink is deep/big, you may consider to use 2 such tools, one for roughing, and another for finishing
Ladyhawke - My Delirium, https://www.youtube.com/watch?v=X_bFO1SNRZg