I am attempting to make my own carbide tools. Everything was going great until I got to tapping the hole for the screw to attach the cutter.
I am using 3/8 18-8 stainless steel keyway stock. I made a 1/8 notch on one end and drilled a hole with #29 drill bit, per instructions for an 8-32 thread screw, but have broken 2 HSS taps trying to tap it? I have not done much tapping, but I'm completing one turn then reversing about a half turn at a time. Is there something harder than HSS that I should be using for the tap?
Getting frustrated, I have everything done for these tools except the tap!
Thanks,