Manual grinding of high speed steel drill bits

  1. The edge is placed flat against the grinding wheel surface

This is the first step in the bit’s position relative to the grinding wheel. Some inexperienced operators lean on the grinding wheel and start sharpening the edge before they even straighten it out. This must not wear well. The “edge” here is the main cutting edge. “Leveling” means that the main cutting edge of the sharpened part is in a horizontal position. “Wheel surface” refers to the surface of the grinding wheel, “against” is slowly close to the meaning. At this point, the drill bit cannot touch the grinding wheel;


  1. Oblique drill shaft repair sharp Angle

Here refers to the axis of the bit line and the location of the relationship between grinding wheel surface, “Sharp Angle” is the half of the point Angle 118 ° ± 2 ° , it’s about 60 °. This position is very important, which directly affects the size of the point Angle of the drill bit, the shape of the major cutting lip and the chisel edge Angle. Do not neglect to lay down the bevel Angle in order to lay down the cutting edge, or to lay down the axis in order to lay down the cutting lip. These errors are common in practice. At this point, the drill bit is ready to contact the grinding wheel in the correct position;


  1. From the edge to the back of the grinding

This refers to the grinding of the bit’s edge slowly along the entire back surface, starting from the edge of the bit. This facilitates heat dissipation and sharpening. At this point, the bit can gently contact the grinding wheel for a small amount of edge grinding. When grinding the edge, observe the uniformity of spark, adjust the hand pressure in time, and pay attention to the cooling of the drill bit. When the edge grinding starts again after cooling, continue to set the position. The Universal Tool Grinder is offered by Purros Machinery Co., Ltd., a professional OEM/ODM tool grinder manufacturer and supplier, End Mill Grinder, Twist Drill Grinder, Lathe Cutter Grinder, Carving Tool Grinder, Drill Sharpener, Universal Grinder, etc.

The Universal Tool Grinder is offered by Purros Machinery Co., Ltd., a professional OEM/ODM tool grinder manufacturer and supplier, End Mill Grinder, Twist Drill Grinder, Lathe Cutter Grinder, Carving Tool Grinder, Drill Sharpener, Universal Grinder, etc.

Manual grinding of high speed steel bit is subject to human factors. Manual grinding will result in a large error of the drill bit due to the difference between human experience and personal intuition. But machine repair and grinding completely avoid this problem. Drill bit grinding machine is more accurate, and the error is small, the human factors are relatively small. Operators do not need to go through professional drill grinding training can be on duty. The operation of the drill bit grinding machine is very simple and the efficiency of the drill bit grinder is very high. Therefore, now many companies that use drill bits choose to buy a drill bit grinding machine to repair the damaged drill bits, which saves a lot of cost. Our tool grinding machines are of very good quality and have been well received by our customers in the market. Welcome to inquire purchase.

Drill bit geometry has several characteristics buy drill bit grinder

Why are twist drill bit especially easy to wear?

There are several disadvantages to the twist drill:

(1) the internal and external difference of the front Angle values of the points on the main Cutting Edge of standard twist drill is too large. The front Angle of the main cutting edge at the outer edge of the bit is about +30; The front Angle near the core is about -30.

Close to the front Angle of the drill center is too small, causing the chip to deform large, the cutting resistance is large; Near the outer edge of the anterior horn is too large, in processing hard materials, the strength of the cutting edge is often insufficient.

(2) the transverse edge is long, and the front Angle of the transverse edge is a large negative value, which is -5 4°~-6 0°, which will produce a large axial force.

(3) compared with other types of cutting tools, the main cutting edge of standard twist drill is very long, which is not good for cutting and cutting.

(4) take place after the deputy vice cutting edge of blade Angle is zero value, cause vice knife after the friction between the surface and hole wall, cutting temperature rise, the outer edge of the corner of bit wear is bigger, has processing surface roughness.Continue reading

Everything you need to know about Drill Bit Grinders

What is Drill Bit Grinder?

Drill bit grinder is a handy machine that is used to sharpen drill bit, so that makes you easily bore holes in a huge number of materials. Whether the drill bit is made by HSS or Carbide Steel, the drill bit grinder can do the job because of it has two types of grinding wheel of options: CBN and SD, CBN for HSS drill bit; and SD for Carbide Steel drill bit. Cutting-edge technology is used for the manufacturing of drill bit grinding machine as it ensures precision and accuracy when you use drill bits to bore holes in any materials whether items are metals or hardwoods.

Who can use a Drill Bit Grinder?

Any person, whether a pro at grinding or a novice. You can use this machine to sharpen drill bit in any situation and anywhere. It doesn’t require expertise or any particular skill set. Only the basic learning of functions and instructions of this machine is required for its operation.

Types of Drill Bit Grinders

There are numerous types of drill bit grinders available in the market. Each type has its own set of features and specifications. The accuracy and precision depend on the type. With the wide range of drill bit grinders available, you can easily find a type that is according to your needs. The most popular drill bit grinders are portable drill bit grinders as they can be easily carried from one place to another.Continue reading

Best Drill Bit Sharpener Buying Guide

When you have been using your drill bits for a fairly long time, you will often realize that they are bound to wear out. When this happens, your first instinct will be to get a new set but is that decision always cost effective?
Drill Bit Sharpener Buying Guide, drill bit sharpener, best drill bit sharpener manufacturer
No of course, because there are various ways available to sharpen the bits and prolong their use. The most common of them are high-quality sharpeners in the market. All you need is to do a little homework to be sure you settle for the best. Let us consider some of the factors to consider when looking for a drill bit sharpener.
PURROS drill bit grinder product technical guidance and development drill bit grinding machine manufacturer

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