Planetary Scaife Bench for SCD tools
PG3 & PG3B machines can produce an exceptionally smooth radii on
the flank of an SCD tool but there will always be a few minor chips at
the free cutting edge.
final process is to lap the table (top) facet of the tool. This
removes any edge chips. The perfection of the edge is a result of an
extremely smooth flank radius surface meeting an extremely smooth flat
surface. Imperfection in either surface will increase the waviness
value of the edge.
Top lapping can also be used to re-sharpen a worn tool.
Before top lapping
After top lapping