We are independent & ad-supported. We may earn a commission for purchases made through our links.
Advertiser Disclosure
Our website is an independent, advertising-supported platform. We provide our content free of charge to our readers, and to keep it that way, we rely on revenue generated through advertisements and affiliate partnerships. This means that when you click on certain links on our site and make a purchase, we may earn a commission. Learn more.
How We Make Money
We sustain our operations through affiliate commissions and advertising. If you click on an affiliate link and make a purchase, we may receive a commission from the merchant at no additional cost to you. We also display advertisements on our website, which help generate revenue to support our work and keep our content free for readers. Our editorial team operates independently of our advertising and affiliate partnerships to ensure that our content remains unbiased and focused on providing you with the best information and recommendations based on thorough research and honest evaluations. To remain transparent, we’ve provided a list of our current affiliate partners here.

What is an Undercut Saw?

By Christy Bieber
Updated May 17, 2024
Our promise to you
About Mechanics is dedicated to creating trustworthy, high-quality content that always prioritizes transparency, integrity, and inclusivity above all else. Our ensure that our content creation and review process includes rigorous fact-checking, evidence-based, and continual updates to ensure accuracy and reliability.

Our Promise to you

Founded in 2002, our company has been a trusted resource for readers seeking informative and engaging content. Our dedication to quality remains unwavering—and will never change. We follow a strict editorial policy, ensuring that our content is authored by highly qualified professionals and edited by subject matter experts. This guarantees that everything we publish is objective, accurate, and trustworthy.

Over the years, we've refined our approach to cover a wide range of topics, providing readers with reliable and practical advice to enhance their knowledge and skills. That's why millions of readers turn to us each year. Join us in celebrating the joy of learning, guided by standards you can trust.

Editorial Standards

At About Mechanics, we are committed to creating content that you can trust. Our editorial process is designed to ensure that every piece of content we publish is accurate, reliable, and informative.

Our team of experienced writers and editors follows a strict set of guidelines to ensure the highest quality content. We conduct thorough research, fact-check all information, and rely on credible sources to back up our claims. Our content is reviewed by subject-matter experts to ensure accuracy and clarity.

We believe in transparency and maintain editorial independence from our advertisers. Our team does not receive direct compensation from advertisers, allowing us to create unbiased content that prioritizes your interests.

An undercut saw is a tool used in woodworking and construction. An undercut saw is very similar to a standard circular saw. In fact, it essentially is an upside down circular saw. Although it is used to cut materials, an undercut saw has a slightly different function and purpose than a standard circular saw.

When installing flooring materials such as wood in an existing home or building, it might be necessary to trim door jambs or trim so that the flooring will fit under the door. This is especially necessary when carpet is being replaced by a solid floor. When carpet is used, the jamb and trim is installed all the way down to the sub flooring, which creates problems when installing solid flooring. When a solid floor replaces carpet, it usually is necessary to cut the jamb and trim off just above the sub flooring. If this is not done, the result after butting the flooring up against the trim is an unattractive gap that extends down to the sub flooring.

The process of cutting the trim and jamb was done by hand before the invention of the undercut saw, since no tools existed that were able to cut parallel to the sub flooring and as close to the sub floor as was needed. The clearance between trim and floor typically is about 1.75 inches (about 4.45 cm), so the motors on common saws were too large to use in this space. The only options were to either cut them by hand or remove the trim and jambs and then cut them. Both options were time consuming and required a great deal of precision cutting.

Undercut saws consist of a rotary electric motor that drives a flat, circular saw blade in a horizontal fashion. The cutting assembly is guided by a base that provides not only a stable surface for cutting, but also a non-skid sliding action. The blade is attached to a flange that extends away from the plane, and this blade is then attached to a drive shaft and configured in a way that allows it to be used parallel to the floor.

The blade can be adjusted vertically, but the method of doing this has its shortcomings. It usually is a slow process, and the fasteners need manual adjustment. Because of the need for peripheral adjustments, it is often difficult to ensure that the blade remains level.

Undercut saws also typically provide a vacuum attachment for safety reasons. This attachment ensures that all cuttings are captured. Unfortunately, the peripheral height adjustments often interfere with the vacuum attachment, making the use of the undercut saw complex and difficult at times.

About Mechanics is dedicated to providing accurate and trustworthy information. We carefully select reputable sources and employ a rigorous fact-checking process to maintain the highest standards. To learn more about our commitment to accuracy, read our editorial process.
Discussion Comments
About Mechanics, in your inbox

Our latest articles, guides, and more, delivered daily.

About Mechanics, in your inbox

Our latest articles, guides, and more, delivered daily.