Review on 🔍 High-Precision Drill Bit: Drill America MMO1 32 4FSE Polished - Ideal for Accurate Drilling by Yuan Walsh

Pretty disappointed in this end mill. I was engraving on a flat sheet of 6061 aluminum and it broke after about 7 minutes of starting work. I didn't think I was going very fast, the spindle was running at 10,000 rpm, 14 ipm feed and 0.002 documents. For some reason it just came out. I used lube and air to get rid of the tiny shavings but it still broke.