The purpose of grinding the major cutting edge of drill bit

The purpose of grinding is to change the edge shape or point angle to increase the front angle and control chip breaking. Or change the distribution of cutting load, increase the heat dissipation condition and improve the life of drill bit.

Three ways to sharpen the major cutting edge:

Three ways to sharpen the major cutting edge

Grinding the concave arc edge and strengthening the centering function of the drill are helpful for chip separation and chip breaking.
Grinding out double or multiple point angles, or grinding out convex arc edges, can improve the heat sink at the edge of the drill edge and increase the life of the drill bit, which is suitable for brittle materials.
Grinding out the chip dividing groove to facilitate chip removal.

There are many points of attention and its use in grinding drill bits. If customers have difficulties in drill grinding, please consult us. We are a manufacturer of drill bit grinding machines. We are familiar with drill bit grinder product structure and function.

Standard of tool dressing

Whether or not you have a good set of standard is the standard to measure whether a center is professional. Standard of grinding, the general rules for different Cutting tool in Cutting different materials when the Cutting edge of technology parameters, including the blade Angle, Cutting Lip Angle, rake Angle, Lip Clearance Angle, blade, chamfering etc parameters (in the carbide drill, make the blade passivation process is called “blade”, pour the width of the blade and the Cutting material, generally between 0.03-0.25 Mm. The process of chamfering on the edge (tip) is called chamfering. Each professional company has its own years of review and repair standards.

The use and safety management of drill bit grinder grinding wheel

Differences between HM drill and HSS drill:

HSS drill bit: Cutting Lip Angle is usually 118 degrees, sometimes greater than 130 degrees; The blade is sharp; The precision (edge elevation, symmetry, circumferential pulse) is relatively low. There are many ways to mend a chisel edge.

HM drill bit: Cutting Lip Angle generally 140 degrees; Straight slot drills are usually 130 degrees and three-edge drills are generally 150 degrees. The blade and tip (edge) are not sharp and are often passivated, or referred to as chamfering and chamfering; High demand for accuracy. The chisel edge is often cut into an s-shape for cutting.

Lip Clearance Angle:

The Lip Clearance Angle of the blade is very important for cutting tools. Lip Clearance Angle is too big, the blade is flabby and easy to tie up. Lip Clearance Angle is too small, then friction is too large, cutting disadvantage.

The Lip Clearance Angle of the cutter varies with the cutting material, type and diameter of the cutter. Generally speaking, the Lip Clearance Angle decreases as the cutter diameter increases. In addition, if the cut material is hard, the Lip Clearance Angle is smaller, otherwise, the Lip Clearance Angle is larger.

The drill bit grinder developed by PURROS is very popular in the market, and we can accept OEM custom service at the same time!

4 guidelines for how to precisely grind drill bits

1. Correctly select grinding wheel (Including type and model)
2. For new drill bits or cutting tools, first step to check and record the main geometric parameters, especially record re-grinding situation of chamfering blade, chamfering, and chisel edge of drill bits or cutting tools.
3. Input the parameter data of grinding wheel, then input data of grinded drill bits or cutting tools.
4. To detect the main parameters of drill bits or cutting tools after grinding, and compare with grinding before, re-grinding again if there are different.

For more drill bit grinding guidelines, please feel free to contact drill bit grinding expert (PURROS).

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→

Why to buy sharpening machines for drill bit?

Bench grinders are so incredibly cheap that every home workshop should have one. As we covered in using bench grinders, there’s a host of uses for a bench grinder, including grinding welds and shaping metal. But perhaps the greatest real-world use is sharpening drill bits.

Our re-sharpening tool machines not only provide drill bit repair, drill bit sharpening, drill bit tipping, and chisel sharpening of our own carbide tipped drill bits, but those made by other manufacturers as well at a fraction of the cost of new ones! So don’t throw away those expensive carbide tipped drill bits, use PURROS drill bit sharpening machines to repair them.

Good quality drill bits are expensive – very expensive in large sizes. But once you can competently sharpen drill bits with a bench grinder, you can buy lots of your drills secondhand, massively dropping the purchase prices.

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Buy sharpening machines for drill bits, please click here.

PURROS provides the drill bit grinding machines that can repair various materials and types of drills. Reconditioning maintains the exact geometry and coating of the original tool. Tool reconditioning is a reasonably priced alternative to buying new tools while still maintaining the same performance. To this end, by the time a tool is reconditioned for the third time, tools costs are reduced by 50 percent.

Drilling problems and Solutions

Question No.	Problem description
1	Aperture Ultra Difference
2	Horn Hole
3	Hole Roundness Is Not Good
4	Poor Surface Quality of Holes
5	Burr At The Exit of The Hole
6	Chipping
7	Back of Drill Bit Blocked Chips
8	Bit Breaking
9	Blocked Chips

1	2	3	4	5	6	7	8	9	Solutions
●	●	●	●		●		●		Reduce tool nose run out
	●						●		increase Inverted cone
●	●	●	●		●	●	●		Reducing blade height difference
●	●	●	●		●				Improving tool symmetry
	●				●			●	Improving cutting edge type
				●	●				Improving blade treatment
				●		●			Increase point angle
●	●	●	●		●		●		Tool length reduction
			●						Select and use coating
			●				●	●	Increasing internal cooling pressure
●		●				●		●	Cutting speed reduction
									Improving cutting speed
●		●		●	●	●	●		Reduce feed
								●	Raise feed

Your drill bit has a problem when is in use, you can use our drill bit grinder to repair, easy, simple, as long as a few minutes, your drill can be used. We are a professional drill bit grinder manufacturer, and welcome batch purchase of products.