Custom Boring Solutions For Your Industry


Advanced Cutting Tool Systems Boring Tools are designed to help eliminate vibration and chatter problems in a variety of hole machining applications. Our specially designed boring tools improve tool life for greater productivity and profitability.

Boring Applications

Multi-Feature Hole Machining

  • Stepped Bores

  • Chamfers

  • Faces

  • Counter Bores

  • Rough, Semi-Finish and Finish

Cylinder Block Main Bearing Bores and Cam BoresCylinder Head Cam Bores

Choosing the right cylinder boring tool for your job can save you time and money. Off-the-shelf boring tools don’t always combine the right features to allow for fast boring and reliable results every time. When you choose a custom line boring tool, back boring, or cylinder boring tool from Colonial Tool, you can run at greater speeds for greater productivity.

You’ll also suffer less downtime and extend the life of your boring tool when you opt for a custom cylinder boring tool. A custom boring tool designed for your specific needs can be optimized for the best cutting set-up, including:

• Approach angles

• Cutting depth

• Vibration reduction

• Heat dissipation

• Cutting tool replacement

The result is a top-quality boring tool that is easy to set up and put to work for your low-, medium- or high-volume production needs. You can also choose custom boring tools for prototype boring and machining to create unique and complicated bores. Custom boring tools are a popular choice for machine boring, cylinder boring and engine boring, as well as any other internal boring situations.


What is Boring in Machining?

In machining, boring is the process of enlarging a hole that has already been drilled (or cast), by means of a single-point cutting tool (or of a boring head containing several such tools), for example as in boring a gun barrel or an engine cylinder. Boring is used to achieve greater accuracy of the diameter of a hole, and can be used to cut a tapered hole. Boring can be viewed as the internal-diameter counterpart to turning, which cuts external diameters.

There are various types of boring. The boring bar may be supported on both ends (which only works if the existing hole is a through hole), or it may be supported at one end (which works for both through holes and blind holes). Lineboring (line boring, line-boring) implies the former. Backboring (back boring, back-boring) is the process of reaching through an existing hole and then boring on the "back" side of the workpiece (relative to the machine headstock).

Because of the limitations on tooling design imposed by the fact that the workpiece mostly surrounds the boring tool, boring is inherently somewhat more challenging than turning, in terms of decreased toolholding rigidity, increased clearance angle requirements (limiting the amount of support that can be given to the cutting edge), and difficulty of inspection of the resulting surface (size, form, surface roughness). These are the reasons why boring is viewed as an area of machining practice in its own right, separate from turning, with its own tips, tricks, challenges, and body of expertise, despite the fact that they are in some ways identical.

Boring and turning have abrasive counterparts in internal and external cylindrical grinding. Each process is chosen based on the requirements and parameter values of a particular application.


Custom Tools for Optimized Boring

While off-the-shelf boring tools can suit for many applications, custom boring tools allow you to focus on the unique challenges of your machining needs. Many shops can save time by choosing custom line boring tools or back boring tools from Colonial Tool. Depending on the diameter of your required bore and the shape and thickness of your material, standard bores may not allow for fast and consistent results.

Unsatisfactory boring can occur when:

• Your boring tool allows too much vibration or chatter

• You require additional passes due to unsuitable tooling geometry

• You are unable to adjust your tooling for your piece type

• You can’t quickly change or sharpen your cutting edges

Don’t waste time, effort and money trying to make your part suit your boring tool. Instead, choose a custom boring tool adapted to your parts. By utilizing a custom boring tool manufactured with your unique processes in mind, you’ll see improvements in productivity and efficiency with reduced downtime and a lower cost per piece. More and more of our customers are seeing the advantages of our custom boring tool design and opting for this flexible and value-added solution.

Saving You in the Long Run

Controlling costs in your machine shop or production floor means finding the best compromise between tool quality and return on investment. With custom boring tools from Colonial Tool, you get tools that are perfectly geared for your boring needs and allow for faster cutting speeds. You'll reduce scrap and rework and see improvements in productivity and efficiency that will quickly pay for your boring tools. That kind of long-term value can really add up over time, so take advantage of our experience in custom boring tools for your business.

Contact our team today for your free quotation and to request more information on our custom tooling options. We can provide line boring tools and back boring tools for a wide range of diameters, materials and surface finishes. Come and discover the advantages of trusting a leader like Colonial Tool for all of your custom boring tool needs.