What are The 7 Main Features of Drill Bits?
A drilling tool would be called a drill bit. This is attached to a drill bit and used as a cutting tool to remove the material usually circular whole cross-section. Drill bits would have various sizes and shape forms in order to create different types of holes in different kinds of materials. The drill bit is usually at the top and put into the drill powered to rotate through the workpiece for drilling holes. It grabs the upper end of a bit called shank with the chuck.
These drills or drill bits are all standard sizes. Drill bit and tap sizes chart comprises metric and imperial sized drills with taps which are required to cut screws. There are also specialized drill bits capable of producing such a hole that has a cross-section not circular.
The article will give the explanation about the 7 main basic features of twist drill which includes Point angle, Cutting edge, chisel edge, Flute Profile, Web thickness, Edge line and Helix angle and thus how they affect in respective application.
As we know different material poses a different demand on the tool. So how to select the twist drill, we can start with the below points.
1. Point angle
The point angle is located at the head of the twist drill and is the angle that exists between the two main cutting edges at the top. Centering twist drills in the material is the function of the point angle.
How many different angles do we have? Heygo Drills has just two angles: 118 degrees and 135 degrees. Smaller point angle would ease centering during processing and would not slip easily under non-vertical working material. A larger point angle will reduce the time spent with the drill, but then it will put up greater wear and tear as well as tougher centering.
Generally used for general steels is 118. 135 degrees are for materials that are hard-cutting.
2. Cutting edge
The principal cutting edge is performing the drilling function. Longer cutting edges show greater cutting performance than shorter ones, but sometimes this difference may not be quite substantial.
3. Chisel Edge
The cut chisel edge is located at the drill point’s centre, drilling into the substance by extrusion, which has an effect of raising the temperature and consuming energy. Measurement of length of cut chisel edge defines drill sharpness. Short cut chisel, very centre, high sharpness, but these will be affected by thickness of web.
4. Flute profile
The flute serves the purpose of removing chips. The wider the flute, better removal of the chip is possible. Poor chip removal will tend to create heat, which will subsequently be responsible for the drill getting annealed and breaking off from the body. Wider profile-flatter flute; thinner profile-deeper flute. Thickness of the web is determined by the depth of the flute.
5. Web Thickness
The thickness of the web is the parameter dimensioning the stability of a twist drill. Twist drills having thicker webs are more stable and designed for higher torques and for use in the hardest materials. For better centering, this would grind the two back angles with a Heygo Tool.
6. Edge Width
The edge line width determines the sharpness and surface finishing of the drilled hole. With wider edge lines, there is higher stability against breaking and it is not suitable for much of work environment or in cases the material comprises higher impurity contents. While narrow edge lines have lower strength but offer a better sharpness offered, they benefit good-cutting equipment and well-finished surface working materials.
7. Helix angle
The main one of the twist drill is the helix angle. A larger angle is suitable for soft material with a longer chip, while a smaller angle is suitable for hard cutting materials with shorter chips.
The running angles are about 23-38 degrees. Different according to the various materials for the market, we have two kinds of straight shank twist drill: one is for general steel with 23-30 degrees, and the other one is a little for stainless steel from 35-38 degrees.
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