There are some differences between Wood CNC Router and metal CNC mill:
First,The wood router typically spins faster — with a range of 13,000 to 24,000 RPM
Second,Professional quality machines frequently use surface facing tools up to 3″ in diameter or more, and spindle power from 5 to 15 horsepower. Machines capable of routing heavy material at over a thousand inches per minute are common.
Third,Some machines use smaller toolholders MK2 (Morse taper #2 – on older machines), ISO-30, HSK-63 or the tools just get held in a collet tool holder affixed directly to the spindle nose. ISO-30 and HSK-63 are rapid-change toolholding systems. HSK-63 has begun to supplant the ISO-30 as the rapid change standard in recent years.