U Drill

U drill is also called fast drill bit or quick violence u-drill cutter, is a kind of drill with internal coolant hole, row Cutting, high efficiency, can be continuous drilling. The front end of the insert is replaceable, which reduces the cost of use.

The difference between U drill and ordinary drill is that U drill uses the insert ----- peripheral insert and center insert, and the insert can be replaced directly after the tool is worn without re-grinding. The use of indexable insert saves material than the solid drill, and the consistency of the insert makes it easier to control the hole size. The rigidity of U drill is good, you can use a high feed rate, and the processing diameter of U drill is much larger than that of ordinary drill bits, which can reach diameter 50~60mm

Normally, U drill bit and crown drill bit are used for drilling, so how to choose U drill or crown drill,

Machining accuracy:

U drill bit: level 10-15

Crown drill bit: Level 7-10

Processing depth:

U drill bit: <5D

Crown drill bit: <15D

Processing efficiency:

U drill bit: From the design point of view, U drill is a central blade, plus an external blade, it belongs to the asymmetric design, belongs to the single-edge tool.

Crown drill bit: It is a symmetrical design drill bit, which can also be called a double-edge tool, and two cutting edges, and the processing efficiency is usually three times that of the two knives of the U drill.

The feed per tooth of U drill is generally only about 0.05mm, and the feed per tooth of crown drill can be 0.2-0.25mm

Therefore, U drill is generally used under five times the diameter, and U drill is not recommended for more than five times the diameter.

U drill bits