|So many teeth, sharks are jealous|
Long post on saw blade alert...
The Freud LU79R010 Thin Kerf Ultimate Plywood & Melamine Saw Blade is essentially what I discuss throughout the article. I actually bought the Freud 7" diameter version because I needed it for my circular saw, but the design is essentially the same.
Why are they so useful? Because plywood is a made up of a bunch of layers of unsightly, but really stable and strong, wood. You cover the unsightly wood with a veneer of good looking hardwood.
|Yeah those five thick layers in the middle... you don't want to see those. It's the two minuscule layers of veneer that you want to see.|
|This is a chipped veneer; I wasn't joking about it looking bad|
|It's red too, the color of danger and communism|
|The standard blade on the table saw. Fewer teeth but still sufficiently badass, think of the literally thousands (tens perhaps) of lineal feet of wood this blade has killcrushmurdered|
Our table saw takes a blade with a 10" diameter. The blade we typically use has 40 teeth. The line of plywood blade that I bought has 80 teeth on its 10" blades. The additional 40 teeth helps create a cleaner cut through the vulnerable veneer. Each tooth is taking a smaller bite. When the blade tooth hits the wood, it chops some space away. A blade with a smaller number of big teeth takes a bigger bite each time the tooth his the wood. A large number of smaller teeth put less stress on the wood because it's taking much smaller bites. A machete and a scalpel will both cut you, but the scalpel will do it a helluva lot more precisely and with a lot less mess.
Also, I didn't buy a 10" plywood blade for the table saw (I already have one of those). I bought a 7 1/4" diameter blade for a circular saw. The 7 1/4" blade has 60 teeth that are spread out along a shorter circumference.
The reason I picked up a plywood blade for a circular saw is simple. Plywood comes in big, bulky, 4' x 8' sheets, which are awkward to handle. A circular saw allows me to cut down a sheet into a more easily manageable size before taking it to the table saw.
Another interesting thing about blades is their balance. A saw spins a blade many thousands of times a second, if it's out of balance even a tiny bit, that causes wobble that wears out the tools and creates a poorer quality cut. High quality blades are very precisely balanced.
|Look at the channel and little round punch out|
|Look at the funky squiggly line and hook-shaped punch out|
The punched out shapes I told you look at in the captions on the last two pictures are part of the blades' designs to increase their balance. I'm not an engineer, so I'm not really sure why it works, but it does.
Lastly, a word about kerf. "Kerf" means how thick the blade is. If you have a 1" wide board and you rip it with a blade that has a 1/8" kerf (wide blade), then you turn 1/8" into sawdust. This blade is a "thin kerf" blade.
|0.079 inches of sweet slicing joy|
|Kerf of the standard table saw blade is approximately 1/8"|
|Zoomed in tooth|