CIRCULAR SAW BLADES: HOW WE PRODUCE OUR HIGH QUALITY BLADES

CMT stands for quality, which means we put quality into circular saw blades and everything we do. It only makes sense. At CMT we figure that if our router bits are going to be top quality, high-performance and orange, then our circular saw blades should be too. And to do that, we simply follow the same guidelines for our saw blades that we do for our bits: start with a solid design, use only the best materials and manufacture with skill and care. And of course, make sure they are trademark orange.

The secret of our success:

DESIGN
The simplicity of a circular saw blade design is in reality a complexity of technical considerations. Each saw blade has to make a certain type of cut, and this requires careful analysis of hook and grind angles, gullet designs, to location of sound dampening slots and the thickness of the blade - just to name a few. So in order for us to get the best design for our circular saw blades - and for you to get the best performance from them - we use the same method that we use to engineer our router bits: we combine the knowledgeable minds and experience of our technical department and the latest computer technology. The result is a superior circular saw blade that has some rather special standard features:

1) Expansion slots: these little hook-shaped cuts in the saw blade help to reduce noise while regulating the expansion and contraction of the saw blade as it generates heat during cutting operations.

2) Anti-vibration design: The anti-vibration cuts in the saw blade do exactly what their name implies: they are the anti in anti-vibration. This translates into less chattering during cutting and consequently it lengthens the life of the saw blade. Anti-vibration also means a flawless cut, so stabilizers and scoring blades are no longer necessary.


circular saw blade

MANUFACTURING
CMT circular saw blades are machined on automated CNC machines, from start to finish. The advanced technology and precision of these machines ensures uniform quality on every saw blade while giving us the possibility to carry out more efficient quality controls.

LASER CUTTING
The steel plate of the blade is laser cut, NEVER die cut, from superior strength steel. This way of cutting steel is not only extremely precise but it makes it possible to cut harder strengths of steel and does not stress the plate while cutting, so the resulting circular saw blade is flat and true and more resistant to warping.

GRINDING AND TENSIONING
After it has been cut, the blade is polished and tensioned, the evidence of which can be seen in the superior finish and a tension ring that are visible on the blade. Then the central bore is ground to a smooth finish so that the blade will fit precisely on the saw arbor and will have perfect concentricity during rotation. The seats for the carbide teeth are also ground, making sure that the carbide tips fit perfectly, providing the right conditions for making a secure braze.

SILVER-COPPER-SILVER SANDWICH BRAZING
Once again, experience has been a good teacher. Automated brazing with a special silver-copper-silver "sandwich" brazing compound yields excellent results and reduces the chances of failed welds. In addition, this combination of metals is critical during brazing because as the steel body and the carbide tipped teeth are heated and cooled, they expand and contract at different rates. The copper layer acts as a buffer and keeps the carbide from cracking during cool down shrinkage. When woodworking, the copper provides flexibility and resistance to impact which in turn protects the carbide tips and steel shoulders when cutting through harder substances or knots in the wood.

SPECIALLY FORMULATED CARBIDE TIPS
What is true for router bit carbide tips is also true for the carbide tips on circular saw blades: what's good for one type of saw blade may not be good for another. At CMT, we have studied carbide formulas and their impact on blade performance and have developed specially formulated carbide tips to match each blade's application. Larger saw blades require an extra-fine harder carbide that holds its edge and resharpens easily, while smaller saw blades need a special carbide that can withstand the occasional nail or imperfections that often occur in construction work. For each saw blade and each use, there is carbide made especially for it.

PACKAGING AND INSTRUCTIONS
CMT circular saw blades are packed and protected for shipping, display and storage in either a sturdy cardboard box or in a patented heavy duty HDPE plastic case that's as durable as our tools. Illustrated instructions for resharpening are included with your CMT circular saw blade so that you have all the details you need to keep the blade sharp, which will also help you extend the life of the saw blade.

QUALITY CONTROL (PDF ENCLOSED)
Download here the PDF concerning how to check a saw blade and the related definitions.