Endmill failure or wrong feeds and speeds?

[CNCOlly]

Quick update. I got back from holiday midweek and on my return, I received a package containing some new endmills from XCAN - Aliexpress. All excited and stocked up on some lovely new oak boards from the local hardwood supplier I decided to have another go. I snapped the new endmill on my first attempt... I'm clearly driving these things way too hard. Time to take a step back and slow things down. Is there a way to tell if the endmill is actually solid carbide as advertised? Ideally, so I can rule out the chance of it being a low-quality bit. It certainly looks the part. It failed on a plunge almost at the end of cutting two parts out. Unfortunately no video.

Here are my settings, again I thought I was being conservative with the settings 1/2 the chip load that the endmill of this size is supposed to be able to cut hardwood.




Some pics of the fail.