Chipping endmills

Try slowing everything down.

Reduce RPM as well as travel.

Higher feed rate means bigger bites.

Higher RPM heats the tool.

Slow the RPM and feed by hand as you get some feedback that way.

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Try different end mills, I have used both HSSCo and Carbide end mills have two draws of them, only time I chip the cutter's edge/tips is when I drop them. Carbide can be brittle and is designed to only work with compression, so easier to knock off a cutting tip if you hit the back of the flute. As small chip radius can also help with longevity. If removing a lot of material use a rougher, otherwise a standard 4 Fl end mills should last a long time and give a smooth finish. You chips look a bit small, speed and feed varies with the end mill type, but I typically am at 50-60% of rated SFM/feed for carbide. Often the I see issues with two high of a RPM in steel with not big enough chips and the cutter can get dull quickly.
 
In the hobby domain, it's always a good idea to use some type of fluid when cutting steel
Your cutters will stay sharp longer and less chance of chipping
-M
 
According to FS Wizard your feed rate should be 4 in/min.
 
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