How should the drill bit of the 4mm bit be calculated?
Drilling sets play the role of drill guide and support, they should be coordinated with precision oriented, but also can not drill and drill sleeve between too much friction, usually with H7/g6 G7/h6
Mm to 4 mm, the drill is a straight shank, and the drill chuck is equipped with it. Drills that can be fitted with drill sleeves are all taper shank unless nonstandard.As for the drill sleeve is divided into 0# to 6 # Morse MorseAh ~ problem layman, too lazy to answer
The drill bit for the 4mm is generally larger than the drill sleeve about 4 or 0.03Such coordination is more accurateSpecific access to relevant GB requirements
