Without the ATC (Automatic Tool Change) function, you will have to use a small finishing/engraving bit to perform the job from the beginning and it will take ages to get the job done. Plus you will have to use a large carving, relieving or roughing bit and get a rough finish. This frequent tool bit change and repositioning of the CNC Router spindle will result in the manual tool change becoming impracticable.We divide the tools changer to two types,which are Linear tools changer(tools arranged in a line) and Circle tools changer(tools arranged in a circle).