Quote Originally Posted by Clive S View Post
It looks like you have done a profile cut to make the hole A pocket would have been better to have the hole cleared.
You don't say how many flutes the cutter has etc.
Sorry updated the original post, it was a 4 flute cutter. I just used an online g-code generator to generate cutting a hole, it goes down 3mm depth at a time and makes it a circle path. I'm already using hsmexpress so I'll do the toolpath on that next time and see.