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 [ Ссылка ]
End mill used in testing: [ Ссылка ]

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