Lindsey Weiss Table Saw August 24th, 2018 - 01:08:28
The saw blade is mounted on an arbor with an arbor nut and the arbor is turned by the motor usually via pulleys and 1 to 3 V-belts. The arbor is mounted into the trunnion inside two or more arbor bearings. These should be sealed from dust for obvious reasons. The size of the arbor determines the size of the hole in the middle of the saw blade. This is usually 5/8" for a 10" blade and 1" or larger for blades larger than that. The strength and alignment of the arbor and the bearings which support it determine the accuracy and smoothness of the table saw. Vibration and noise should be kept to a minimum and the saw blade should be straight in the table from front to back at all elevations and bevel angles.
One of the more useful add-ons for just about any table saw is either an upgraded system offered by the manufacturer, or an aftermarket miter gauge or crosscutting sled. These tools provide, in various combinations, repeatable incremental angle positioning, longer fences, stop blocks and other advanced features that can come in handy in projects that call for precision crosscutting.
There are many hold-down and anti-kickback devices on the market. Some are good and some are a hazard in themselves. I had a large metal combination hold-down and anti-kickback device get caught in the saw blade, ripped off the fence to which it was clamped and flung into a plate glass door behind the saw. I heard it go whistling past my right ear. It missed me because I was standing, as always, well to the left of the saw blade.
The bench top model is preferred for those who are looking for a table saw that is portable and less expensive; however, remember that you always get what you pay for. The bench top saw has the least amount of capability out of any of the table saws. With the decreased size and weight of the saw, it is less durable and there are greater restrictions of the size of projects one can do.
One drawback of lighter-weight table extensions is that they have less mass, and the overall mass of the saw is what soaks up the vibration crated by the motor and other moving parts. The added mass of heavy cast iron extension wings decreases vibration, which in turn helps the saw stay in calibration, and also helps it stay planted firmly on the shop floor. On less expensive saws, extensions made of stamped metal, or ones that aren't precision ground, can also compromise the overall flatness of the table surface.