CNC Machining Mild Steel at 8,000 RPM… Until My End Mill BREAKS!

In this video, I’m CNC machining mild steel with a 6-flute carbide end mill from Haas Tooling (Part #03-2138). Unfortunately, this end mill doesn’t survive the job!

This tool had already seen plenty of abuse before this video, so I wasn’t exactly starting with a fresh end mill. Watch the entire machining process in real time, including the moment the tool breaks. I stop the machine and explain what happened.

Cutting Parameters:

Machine: Sharp SV-2412 CNC Mill

Material: Mild Steel

Tool: Haas Tooling 6-Flute Carbide End Mill (#03-2138)

Spindle Speed: 8,000 RPM

Depth of Cut (DOC): 0.750″

Width of Cut (WOC): 0.025″

As usual, there’s almost zero editing. No time-lapses, no sped-up footage, just real CNC machining from my shop.

Do you think these cutting parameters were too aggressive, or was this worn-out end mill simply ready to retire? Let me know in the comments!

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