What is the difference between a regular drill and a U drill

Take stainless steel as an example, the two are mainly different in three aspects, such as feed, speed and linear speed.

First, the amount of supply

Common bit: feed 0.03~0.08.

U drill: the feed is 0.06~0.18.

Second, the speed

Normal bit: rotating speed from 200 to 800 RPM.

U drill: the rotating speed is much higher than ordinary drill. 1500~3000 RPM.

Three, linear speed

Normal bit: linear speed of 8.

U drill: line speed is much higher than ordinary drill, 115~165.

Shovel drill is a tool improved on the basis of U drill. The range of equipment used is wide (can be used in rocker drill, vertical drill, bed, processing center and other equipment) the rigidity of the equipment is not high. The whole cutter head can be accurately centering, the cutter head is equipped with chip separating groove and chip breaking groove, which can process deep holes.
Shovel drill is generally used for U drill processing and ordinary drill processing of intermediate speed processing, the general blade is high speed steel, speed is generally below 1000, compared with ordinary drill does not need to grind the workers' skills are low.
The shovel drill consists of a steel shank and a blade with a removable head. The handle part of the knife rod has two structures: side fixed handle and Mohs handle. The side fixed shank is often used in CNC lathes, CNC machine tools in machining centers, etc. Mohs shank is used in vertical drill, rocker drill, car and other traditional equipment. By simply installing a set of cooling rings, external cooling can be turned into internal cooling.
Cooling water enters the tool rod through the cooling ring, and directly cools to the blade part through the internal cooling hole. And the high-pressure cooling water is more conducive to chip removal. The chip removal form of the cutter bar has two kinds of straight groove and spiral groove.
When the workpiece rotating tool is stationary, straight groove is more conducive to chip removal, such as lathe processing. When the tool at high speed rotating workpiece static, the more choice of spiral chip groove, such as CNC machine tools, rocker drill and so on. According to the length to diameter ratio (that is, the ratio of length to diameter) of the cutter bar, it can be divided into 3D,5D,7D,9D or even higher. Shovel drill blade is divided into carbide blade and high-speed steel blade two kinds.