In this Part 2 follow up to last week's video, we are machining the male (pin) end of our custom drill rod tooljoint prototypes. These 318mm diameter tool joints are a custom thread that's 40% larger than anything of its kind commercially available, and will be screwed onto 1 tonne rods.

To be used by the 'big rig' a land based, road registered drill rig capable of drilling a 3m diameter hole, 250m deep from the surface, mostly intended for large underground ventilation holes.

In the video, we use:

WNMG tips for external turning.
Depth of cut 3.5mm
Finishing 1mm
170 VC, 0.33.35 feed

CNMG tips on KONG (the boring bar)
Depth of cut 4mm
Finishing 2mm
120VC, 0.30.35 feed

Hand ground Kennametal top notch inserts for the custom thread profile.

As always, thanks for tuning in and I'll see you in the comments section!