Coated: Nitride Coated
Material: High Speed Steel
Type: Straight Groove Step Drill Bit
Package:3pcs/set Step Drill Bits (opp bags)
Handle:Hex
Scop: Thin iron plate,aluminum,insulation panels,PVC panels 0.4mm thickness within the timber.
Color:black
Attention:
Suitable material: Workpieces with general hardness, such as plastic, PVC plate, iron plate, plate thickness within 3MM. Please note that stainless steel and spring steel are not applicable. Not for quenching. (Water injection cooling while working, it can effectively extend the service life of the drill bit, especially in the case of continuous drilling)
Because of the outer diameter of each step of the step drill is gradually expanded,then the corresponding cutting resistance and linear velocity will also be gradually increased.
Owing to the step drill is completely dependent on the inclined edge that is only with 1mm length,If the feed speed is too fast when drilling,it will be easily to be annealing caused by abrasion of the oblique edge. Please give a downward force when drilling, do not press down too hard to avoid the edge wearing.
Rotating speed:
3-12 speed:260-400
4-12 speed:260-400
4-20 Speed:180-240
