Drilling holes on cnc

[Wal]

>I know my spindle has certain collet sizes so standard bits are unlikely to fit.

Why not - you're using an ER system, aren't you?

Anyway, as m_c said, there are plenty of options out there - a cursory search brought this up:

https://www.cadem.com/single-post/cn...l-helix-angles

Not a bad place to start. As per Chaz's advice - yep, it can be a bit hit and miss with the 2.2kw Chinese spindles - you don't want to go too fast and burn up the drill, but you really don't want to drop much lower than 9krpm as you risk stalling the spindle...

One thing I would say: make sure you spot drill first..! If you're using standard drill lengths then you can expect a bit of a squeal on the first peck, but that should disappear once the drill gets a bit deeper... Here's a vid of my machine drilling out a section so that I wouldn't have to deep slot (fast forward to about a minute in). I'm sure I could've gone a bit quicker, but you know - when you find something that works you tend to keep it that way..!



Good luck.

Wal.