Machining 4140 with LakeShore Carbide & Tormach PCNC - Part 1

I was cutting a piece of 4140 last week and really loved the way it was cutting: it sounded great (very quiet!), it made a beautiful chip stream and left a superb finish. It got me thinking: let's test out various cut recipes to machine 4140 and dive into some of the speeds and feeds details for RPM, feedrate / IPM, chipload per tooth, SFM, etc! I was using LakeShore Carbide endmills and mentioned this test project idea to Carl at Lakeshore; before I knew it, I had an email from LakeShore Carbide's shipping department - Carl (against my wishes!) supplied the end mills for this test. Please trust his generosity did not influence my review. The proof is in the pudding, so you'll just have to watch to see how it all ended! Excel worksheet download link at http://bit.ly/1MFaYAl End mill used in testing: http://bit.ly/1EpE1WO If you enjoy this NYC CNC video please hit the like button and share with a friend, it really goes a long way! Recent Videos: Turning & Threading on the Tormach CNC Lathe:    • Turning, Facing & Threading on the Tormach...   DIY Arduino CNC machine with GRBL:    • DIY Cheap Arduino CNC Machine - Machine is...   Subscribe For More - http://www.youtube.com/subscription_c... Follow on Twitter -   / nyccnc   Facebook -   / nyccnc   Instagram   / saundersmachineworks   Music copyrighted by John Saunders 5 Reasons to Use a Fixture Plate on Your CNC Machine: https://bit.ly/3sNA4uH