A customer was drilling 0.228" diameter holes 1.1"
inch deep in 316 stainless steel. The tool he was using was
a TiCN coated cobalt drill which he was buying at a cost of
$9.95 each. The drills were being run at 600 RPM and being
fed at 1.8 IPM in a peck drill cycle.
Productivity and tool life were unsatisfactory. Each drill
was lasting about 200 holes before having to be replaced.
We proposed an RTW Type H solid carbide coolant through
drill at a cost of $75.00 each. This drill was run at 1,200
RPM in a straight drill cycle (no peck drilling) feeding at
3.6 IPM. One drill ran the entire lot of parts (2,000 holes),
and was put back in the drawer for the next run of parts.
Total tooling cost was reduced from $99.50 to $75.00. More
importantly, the customer reported an increase in productivity
and was thrilled with the results.