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Selecting a CNC drill is not simply about finding a tool with the correct diameter. The workpiece material, drilling depth, machine rigidity, coolant delivery, hole tolerance, cutting parameters, and expected production volume all influence the final result. A drill that performs adequately during occasional machining may not deliver the same stability when used continuously on a high-speed CNC line.

For general metalworking applications, the Solid Carbide Standard Drill Bits GD Series offers a versatile option for manufacturers looking for consistent drilling performance. The series covers diameters from 1 mm to 20 mm and is available in 3XD, 5XD, and 8XD configurations. With internal coolant delivery, an ultra-fine grain carbide substrate, optimized flute geometry, and nano-composite coating technology, it is designed to address several common challenges in automated CNC drilling.

1. Match the Drill to the Material

Workpiece material should be one of the first considerations when choosing a solid carbide drill. Carbon steel, alloy steel, mold steel, hardened steel, and cast iron do not generate the same cutting resistance or heat. A suitable drill therefore needs adequate hardness, wear resistance, and edge strength.

The GD Series is intended for machining materials including carbon steel, mold steel, alloy steel, tempered steel, and cast iron. Its ultra-fine grain carbide construction provides a rigid cutting foundation, with substrate hardness of more than HRC60. This helps the cutting edge remain stable during repeated drilling operations.

For manufacturers producing hundreds or thousands of holes, tool durability can have a direct effect on production efficiency. Under suitable machining conditions, the GD Series is specified to provide approximately 30%–50% longer service life than conventional carbide drills. Longer tool life can reduce tool-change frequency and help maintain uninterrupted CNC production.

2. Select the Diameter According to the Hole Requirement

Drill diameter affects spindle speed, feed rate, cutting load, and finished-hole performance. A 2 mm drill and a 16 mm drill obviously require very different machining conditions.

The Solid Carbide Standard Drill Bits GD Series provides a continuous diameter range from 1 mm to 20 mm, equivalent to approximately 0.0394"–0.7874". This gives CNC operators a broad selection within a single drill family, from small-diameter holes to larger general-purpose machining requirements.

Diameter should also be considered together with hole depth. Choosing a longer drill than necessary can reduce overall rigidity, while selecting a short drill for a deep hole may prevent the required depth from being reached. A practical tool selection therefore considers both diameter and depth before machining begins.

3. Choose Between 3XD, 5XD, and 8XD

Drilling depth is closely related to tool stability. The GD Series provides three commonly used depth configurations: 3XD, 5XD, and 8XD.

A 3XD drill is appropriate for relatively shallow holes where rigidity and efficient cutting are priorities. Its shorter working length helps minimize tool deflection and can be advantageous when vibration needs to be controlled.

The 5XD version provides additional reach while retaining a practical balance between rigidity and drilling depth. It is suitable for many general CNC machining operations where hole depth exceeds the capability of a short drill.

For deeper holes, the 8XD configuration provides greater cutting reach. However, deep-hole drilling places greater demands on machine rigidity, workpiece clamping, coolant pressure, and chip evacuation. The longer the tool extends into the workpiece, the more important the complete machining setup becomes.

4. Control Vibration Before Increasing Cutting Speed

High-speed machining should not be understood simply as running the spindle faster. If the tool, holder, machine, or workpiece lacks sufficient rigidity, excessive speed can lead to chatter, poor surface finish, cutting-edge damage, hole deviation, and premature tool failure.

The GD Series uses an integral solid carbide body to provide a rigid cutting structure. Its 140° point geometry and optimized helical flute design help improve entry stability and cutting smoothness.

This becomes particularly important as drilling depth increases. A deeper hole leaves less room for error, while vibration and tool deflection can become more pronounced. Instead of pursuing maximum spindle speed, manufacturers should aim for a balanced setup involving tool rigidity, secure workholding, appropriate feed, and stable machine conditions.

5. Give Chip Evacuation Enough Attention

Chip removal is one of the most important factors in continuous drilling. When chips accumulate inside a hole, cutting resistance and friction can increase. Heat may build up, the hole wall can be damaged, and in severe cases chips can cause jamming or tool breakage.

The GD Series features an optimized helical flute and polished flute surface to support smoother chip movement. Its asymmetric flute structure is designed to reduce cutting resistance and assist chip evacuation during continuous drilling.

Internal coolant delivery provides an additional benefit. Rather than supplying coolant only around the outside of the tool, coolant-through drilling directs coolant toward the cutting zone. This helps manage heat and can assist in carrying chips out of the hole, especially during deeper drilling cycles.

6. Consider Dry and Wet Machining Conditions

Not every production line uses the same cooling method. Some CNC operations depend on coolant-through machining, while others may use external coolant or dry cutting depending on the equipment and material.

The GD Series uses multi-layer nano-composite coating options including TiN, TiCN, and AlTiN. These coating technologies are intended to provide high surface hardness, oxidation resistance, and reduced friction at the cutting interface.

This makes the series suitable for both wet and dry machining when the cutting conditions are properly established. For longer drilling cycles and deeper holes, internal coolant is particularly valuable because it helps remove heat directly from the cutting area.

At the same time, no coating or drill design can replace correct cutting parameters. Spindle speed, feed, coolant conditions, drill diameter, material, hole depth, and machine rigidity should all be evaluated before production parameters are finalized.

7. Evaluate Hole Accuracy and Drill Entry

For precision CNC machining, producing a hole is only the starting point. Hole diameter, straightness, surface quality, burr formation, and repeatability are also important.

The GD Series incorporates cross-edge correction and a self-centering point design. In suitable applications, this geometry allows the drill to establish its position effectively without requiring a separate center hole before drilling.

The finished hole tolerance can reach m7 grade according to the supplied product specifications. A refined cutting edge is also intended to reduce cutting impact and friction, supporting cleaner hole walls and lower burr formation.

Consistent hole quality is especially valuable in automated production because stable results can reduce the need for secondary operations such as deburring or corrective machining.

8. Adjust Cutting Parameters for Each Material

Even a high-quality solid carbide drill must be operated with appropriate cutting data. There is no single spindle speed or feed rate that works equally well for every material and diameter.

The GD Series cutting recommendations distinguish between materials such as mild steel, S45C, SCM440H alloy steel, SKD61 hardened steel, gray cast iron, nodular cast iron, titanium alloy, and Inconel 718. These materials have significantly different machining characteristics, so their cutting conditions need to be adjusted accordingly.

For example, the recommended coolant cutting speed for a drill around D6.0 can vary across different steel grades and can be substantially lower when machining titanium alloy. Drill diameter also affects the recommended cutting parameters.

Manufacturers should therefore treat published cutting data as a starting point rather than a universal formula. During actual production, spindle load, vibration, chip shape, hole quality, temperature, and tool wear should be monitored and the parameters adjusted when necessary.

9. Consider the Tool Manufacturer Behind the Product

For CNC manufacturers, tool performance is only one part of the purchasing decision. Batch-to-batch consistency, production capability, technical support, and customization options can be equally important when drilling tools are used in automotive, mold, aerospace, machinery, and precision manufacturing.

CHANGZHOU BOSTONTOOL CO.,LTD. is based in Changzhou, China, and focuses on the development and production of metal-cutting tools, including solid carbide drills, milling cutters, reamers, and customized cutting tools. The company was established in 2013 and integrates product development, manufacturing, sales, and technical service.

Its manufacturing capabilities include more than 20 imported SACKE and WALTER high-precision machines, with MES-based process management used to support production control. The manufacturing process covers carbide material selection, grinding, edge treatment, coating, and final inspection.

For customers with application-specific requirements, customized tooling can also be considered. Depending on the project, options may include non-standard diameters, special flute lengths, different drill point angles, customized coatings, and laser marking.

10. Build Tool Selection Around the Complete Machining Process

There is no single drill configuration that is ideal for every CNC application. The most suitable tool is the one that matches the workpiece, hole geometry, machining depth, machine capability, cooling method, and production requirements.

For shallow holes, 3XD can provide a useful combination of rigidity and cutting efficiency. When additional reach is required, 5XD offers a practical middle ground. For deeper drilling, 8XD can provide the necessary working length, provided that the machine and coolant system can support the application.

The Solid Carbide Standard Drill Bits GD Series combines a 1–20 mm diameter range with 3XD, 5XD, and 8XD options, internal coolant-through capability, self-centering geometry, ultra-fine grain carbide, and multi-layer nano-composite coatings. These features make the series suitable for a broad range of general-purpose CNC metal drilling applications.

Ultimately, effective drill selection should begin with the actual machining requirement rather than with tool specifications alone. Evaluate the material, hole diameter, depth, tolerance, cooling method, machine rigidity, and production volume first, then select the corresponding drill configuration and cutting conditions.

For manufacturers seeking a versatile solid carbide drilling solution for continuous CNC production, the GD Series provides a practical combination of dimensional range, drilling-depth options, coolant delivery, wear resistance, and hole-quality features. Working with an experienced supplier such as CHANGZHOU BOSTONTOOL CO.,LTD. can also make it easier to match tooling specifications with real production requirements.

http://www.bioshtool.com
CHANGZHOU BOSTONTOOL CO.,LTD.

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