Types of CNC Drill Bits for Precision Drilling and Industrial Applications

CNC Drill Bits: Types for Precision and Industrial Drilling

Selecting the right CNC drill bits is critical for manufacturers who want precise holes, and cost-effective tooling. The appropriate drill bit depends on the material of the part, diameter, depth, tolerances, capabilities of the machine being used, and volume of production. Special drill bits like gun drill bits, carbide drill bits, pilot point drill bits, taper drill bits can help manufacturers overcome precision drilling issues. The common mistake among industrial buyers in selecting a drill bit is relying solely on its diameter or cost without considering the complete machining application. Instead, manufacturers should select a drill that suits the entire application.

Quick Answer: The right CNC drill bit depends on the material type, diameter, depth, tolerance, capabilities of the machine you will be using, and quantity of production. The gun drill bit works well for deep holes, carbide drill for hard production, pilot point drill bit for making holes and taper drill bit for the tapered shape.

How to Choose the Right CNC Drill Bits for Your Application

The appropriate CNC drill depends on the part requirements and machining conditions. Before purchasing drilling tools, manufacturers should evaluate the following factors:

• Material type and hardness of workpiece

• Size of hole needed to be drilled

• Tolerance needed in drilling holes

• Hole position and dimensions

• Surface finish needed

• Spindle capabilities and CNC machine type

• Type of coolant used

• Machining speed and feed

• Number of parts needed to be manufactured

Based on these parameters, the buyer can select whether to use a standard, carbide, coated, deep hole, or special purpose drill. For large-scale production purposes, buyers need to look at the price of a part, not just the price of the tool.

Types of CNC Drill Bits for Industrial Machining

There is a range of categories in which CNC drill bits can be organized according to material, shape, usage, or coolant. For instance, carbide drills fall into the category according to tool material, gun drills into both application and shape, and coolant-fed drills according to coolant system design.

Gun Drill Bits for Deep-Hole Drilling

Gun drill bits are made for deep hole drilling in which normal drill bits might face difficulties in terms of straightness, chip removal, heat dissipation, and dimensional accuracy.

They are used in making molds, hydraulic parts, automobile parts, aerospace components, and other machined parts. The unique design and coolant feeding system of gun drill bits enable drilling of deep holes in a controlled manner.

In the buying of gun drill bits, the following parameters should be specified by the buyer: hole depth, diameter, depth-to-diameter ratio, workpiece material, straightness requirement, coolant delivery, and machine configuration.

Carbide Drill Bits for High-Performance Production

Carbide drill bits are an excellent option for difficult CNC machining operations where there is a requirement for wear resistance, dimensional stability, and rapid material removal.

Solid carbide drills can achieve higher speeds than many regular HSS drills when there is good matching of the machine, setup, coolant, and cutting parameters. Solid carbide drill bits have many benefits when high-quality holes and long tool life are considered.

Pilot Point Drill Bits for Accurate Hole Starting

The pilot point drill bits are purposely developed to ensure that accurate positioning is achieved while minimizing any wandering during the first engagement of the cutter with the workpiece.

These types of drills are helpful in cases where hole location accuracy is critical such as thin material drilling as well as production drilling operations. It must be noted that drill design needs to be considered along with machine stiffness and other factors.

Taper Drill Bits for Specialized Hole Profiles

Taper drill bits are when a part needs a tapered hole or variable in diameters on the hole. This is sometimes an option if a standard drill is not able to give the desired results.

In case you need to buy taper drill bits, it will be good if you provide all necessary details, such as the taper angle, large and small diameters, depth of the hole, the material, and dimensional tolerances.

Other CNC Drill Bits for Production Applications

There are other types of CNC drilling that could be used by manufacturers depending on their machining needs.

• Twist drill is a multi-purpose drill which is used for drilling in various materials.

• Indexable drill is another type of CNC drill, and the use of replaceable inserts in this drill makes it useful in production where maintenance and cost of tooling are considerations.

• Coolant-fed drill provides better heat control and chip removal since coolant reaches nearer the point of machining.

• Coated drills will offer higher wear resistance if the coating material is properly chosen based on workpiece and machining conditions.

What Information Should You Provide When Ordering CNC Drill Bits?

Full information regarding the application will allow the tooling provider to suggest a suitable drill, avoiding any ordering of inappropriate tooling.

The buyer needs to provide the following information: part drawing/CAD file, material of the workpiece, hole diameter, depth of the hole, tolerances, whether it is a blind or through hole, CNC machine specifications, spindle specifications, method of cooling, and expected quantity of production.

In case the existing drill presents some issues, then the buyer needs to provide information such as tool life, hole quality, cutting parameters, breakages, burring or chip removal.

When Should You Choose Custom CNC Drill Bits?

Standard drilling tools may not be able to achieve the expected results in terms of peculiar hole configuration, difficult materials, tolerances, deep holes, or specific machining process. In such cases, special purpose CNC drill bits can be designed according to the requirements. Customized tooling can be specified for its size, total length, point angle, flutes configuration, material, coating, and coolant specifications.

For mass production, customized tooling is particularly useful since even slight gains in terms of longevity, cycle time, or precision of holes can significantly lower the unit cost.

Request CNC Drill Bits for Your Application

If you need CNC drill bits according to your material and hole dimensions and production quantities, provide us with your drawing or CAD file along with information about the material, hole dimension and tolerances, machinery and production quantities. Our engineers can recommend the appropriate drill material, geometry, coating, and configuration for your application. Submit your requirements to request a quote for precision CNC drilling tools designed for your application.