Published at Monday, September 03rd 2018. by Adriene Michel in Industrial Machinery.
Tools & Materials
All About Saw Blades
Although blades for a miter–saw or a table saw represent a considerable investment, they have a major deal to do with the caliber of cut and how much attention a saw edge will need after it comes off the saw. Blade sketch varies, depending on whether the blade is used for ripping or crosscutting, but most blades these days are carbide tipped rather than made from high–speed steel.
• Number and pattern of teeth
• Blade flatness
• Quality and amount of carbide tips
Rip vs. Crosscut
'Rip blades' have fewer teeth than 'crosscut blades' a 10-in. rip blade typically has 24 teeth juxtapose with a cutoff blade with as many as 80. Many woodworkers opt for combination blades with 40 to 60 teeth that can be used for either ripping or crosscutting. That saves the trouble of switching blades every time a different type of cut is made. More than a‐dozen brands are readily available, at prices from about $35 to $120. Performance varies considerably, although the most expensive blades usually make smoother cuts than economy blades.
Tooth types differ
There are a few common tooth designs.
On an Alternate Top Bevel blade (ATB), rotate teeth are beveled in opposing directions to cut wood fibers cleanly when crosscutting. For faster rip cuts, a flat-topped ranker (ATB & R) can be added between sets of beveled teeth. Another type of blade, called a triple chip pulverize, is designed for chip-free cuts in hard wood, plastics and plastic laminated to wood, such as melamine. Within these fundamental parameters, manufacturers can regulate hook and bevel angles and make other modifications for specific applications. Lofty hook angles, for example, make for faster but rougher cutting.
Materials and sizes
Standard saw blades make a Cerf 1/8 in, wide. Thin, or narrow, Cerf blades have a slightly thinner plate so they take less power to operate and consume less material. They are, however, not as stiff as a standard blade. Manufacturers use a variety of plate designs to minimize warping, noise and heat build-up, but dish flatness is a key factor in overall blade caliber.
Another is the carbide that’s used for cutting tips. Better-quality carbide is more durable, and there should be enough of it to allow for a number of sharpening before the blade must be scrapped.
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