Carbide spot drills are no longer limited to drilling centering holes. For example, you can also mill the edge, drilling and Milling Cutters integrated, the angle can also be 60 °, 90 °, 118 °, 135 ° and 140 °, etc., can be used for a variety of processing: drilling centering holes, engraving, chamfering and remove edge burrs, etc.
Carbide spot drills can also be used to machine chamfered holes before formal drilling. By controlling the drilling depth of the centering drill, the required chamfer aperture can be formed while determining the hole position. You can make a centering hole for secondary drilling in the same step, and at the same time form a chamfer at the hole. Slightly increasing the centering drilling depth can form a hole larger than the diameter of the secondary drill. In this way, when you drill with a smaller diameter secondary drill, you can get a larger diameter chamfer at the orifice.
Blow are our standard sizes of carbide spot drills for reference.
Contact: Julia Long
Add: No.52 Hongqi North Road,Shifeng District,Zhuzhou,Hunan,China