Hi all, working on my design for my first CNC mill, main use will be PCB isolation routing. I'm on a tight budget and have not yet purchased a spindle, so I saw this on sale for $60 CAD:
6A Electric Die Grinder | Princess Auto

Quick specs:
Type Heavy duty die grinder
Current Rating 6 A
No Load Speed 7,000 to 30,000 RPM
Variable Speed Yes
Collet Size 1/4 in.
Voltage Rating 120 V

From what I've read elsewhere, the 30,000 RPM would be suitable for PCB copper traces, correct? I know I've also seen recommendations against Die Grinders in other threads for bigger scale projects, but since my goal is just a 200mm x 200mm x 100mm work area and primarily used for PCB, is this a good starter spindle?

Will I run into issues with the 1/4" collet for engraving bits?

Thanks all!