As for me, I was pleased to see GDN take their time to switch to a new PBC bit during this crucial part of the drill. It gives me much more confidence to know that they're taking every precaution.
Wikipaedia notes:
In 1933 two Hughes engineers, one of whom was Ralph Neuhaus,invented the tricone bit, which has three wheels. The Hughes patent for the tricone bit lasted until 1951, after which time other companies started making similar bits. However, Hughes’ market share was still 40% of the world's drill bit market in 2000. The superior wear performance of PDC bits gradually eroded the dominance of roller cone bits and early in this century PDC drill bit revenues overtook those of roller cone bits.
In today's modern industry the two main types of drill bits are now classed as PDC (polycrystalline Diamond Compact) and Roller Cone.
AVV
aav limited
