CNC Drill Bit Guide (Infographic)
Tags: Infographics, Cnc, Factory, Manufacturing

Many aspects go into selecting the type of bit you should be using with your CNC machine. This guide and infographic will help you in that process.

Many aspects go into selecting the type of bit you should be using with your CNC machine. This guide and infographic will help you in that process.

Many aspects go into selecting the type of bit you should be using with your CNC machine. This guide and infographic will help you in that process.

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Within this article, we will go through the following types of bits:‍

Material

High-speed steel

Great for general purpose and can do well with most drillings

Works great with wood, soft metals, fiberglass, and PVC

Will wear out faster than the more durable drill bit materials

‍Cobalt steel

More heat and wear-resistant than high-speed steel bits

They have a longer tool life and can run potentially 25% faster

Can work great for harder metals and softer materials as well

Carbide-tipped

Even more heat and wear-resistant than the two prior bits

They maintain their sharp edges significantly longer on abrasive materials

Not as brittle as solid carbide bits and can handle great with a handheld drill

Carbide bits

The hardest, strongest, and most wear-resistant bit material out there.

Best performing on hard and very abrasive materials

To protect the construction of the bit, it is required that you use a rigid tool holding machine and not be used with a handheld drill‍

Finish

Uncoated bits

Works well with general-purpose drilling of most plastic and metal‍

Black-oxide and black-and-gold-oxide bits

Produce less friction than uncoated drill bits

Longer lasting while drilling at higher speeds‍

Titanium-nitride (TiN) coated bits

Added heat and wear resistance

Can run at higher speeds than above options

Titanium-aluminum-nitride (TiAlN) and aluminum-titanium-nitride (AlTiN) coated bit

Most heat and wear resistance

Long-lasting drill bit life, even with highly abrasive materials

Length Class

Jobbers’-length bits

The best choice for a bit length that will work well with many applications

Has the length and strength to handle most materials‍

Maintenance-length bits

More rigid and shorter than jobbers’-length

Longer than short-length bits

Better than Jobbers’ when drilling more rigid materials

Known as “the mechanics’ bit”

Short-length bits

Due to the shorter length, this bit will allow for more rigid drilling

The rigid nature of short-length bits enable it to drill straighter holes than other bits

Know as “screw-machine” and “stub-length” bits‍

Extended-length bits

Ability to drill deep holes that many other bits aren’t able to achieve

Extended-length have less rigid construction and should be used with a stable tool holder

Reduced-shank length bits

Larger tip than the shank

This bit allows users to drill large holes

Taper-shank length bits

Excellent bit for working with drill presses and lathes

The all-purpose bit that can deal with various materials

Bit Style

Spiral-flute bits

An excellent pick for general purpose drilling

The spiral flute bit provides stable finishing cuts with either handheld or table routing

Parabolic spiral-flute bits

Contain wider flutes than other styles

Wide flutes allow for more coolant efficiency and improve chip flow‍

The Final Product‍

Despite the ever-changing roles of computer controls, CNC production is still widely dependent on machinery. This makes choosing the accurate machine tools and parts a pivotal part of the process.

For drilling machines, like routers and mills, the drill bit choice has a significant influence on the product’s production. Whether it is material, finish, length, or style, choosing the right tool is pivotal.

Make sure to use our quick guide infographic to understand better how bits stack up against one another.

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