Machining a Casing Drive Sub (from 100kg of SOLID steel!)

Today we're making a casing drive sub from a 100kg billet of 4140 steel. This one is a bit of a rush job, so we're just going to crack into it. We'll be usng a bunch of different tools to get the job done, but the most fun is the 62mm HTS drill. And we'll be going all the way with it. 320mm deep... full steam ahead. Enjoy. About HAL Heaavy Duty: We're a real life machine shop for a 60 year old drilling company located in Central Queensland, Australia. Our job is to keep rigs running in the field - fixing all the stuff drillers break and creating all the custom gear they need to get the job done! We run two CNC's, manual repair lathes, a few mills and a big green Megabore Lathe we call "THE HULK"... and are constantly having to make weird and wonderful tools for odd (usually oversize) jobs. We're a little shop that takes on big projects, and the latest is our MEGADRILL project where we're manufacturing a 3.0m (10 foot!) drill bit that'll weigh upward of 20 tonnes and we're getting ready to send it 250m (800+ feet) deep. If you want to catch up on the progress... here's the latest on the project! https://youtu.be/OKPr15PucGQ?si=dTVN39xDaAYi3Je9 https://youtu.be/mK3slsayuZM?si=kB4koTj7MrkngnlJ https://youtu.be/qtsz7cLtDY8?si=LL-ip0p-M-FVsoTs https://youtu.be/j_g8wMRu7wc?si=_PO-F-opHgggzjU1 https://youtu.be/r796Mw4j1gM?si=_9yPWEgUw4b10d5e We release our weekly video at 1pm Friday (AEST), so be sure to subscribe if you want to see stuff you really won't find anywhere else!