At its most basic, a jointer is two flat tables,
with a rotating cutterhead between them. The cutterhead has 3 or 4 very sharp
knives in it and they do an excellent job of cutting/shaving whatever is passed
over them…hardwood, softwood, plastics, flesh- whatEVER. Those blades will not
stop for anything.
That is one way of saying- BE CAREFUL when using
your jointer.
Jointers come in a wide variety of sizes. I have
seen everything from a 4-inch up to 16-inch. The size is related to the maximum
width of wood that can be surfaced on the machine. (“Surfaced” simply means
laying the board flat on the table and passing it over the cutterhead as many
times as it takes to make that wide side smooth and flat.) Many 4-inch, and
some 6-inch, jointers are called
“motorized jointers” or table-top jointers. This is because they are very small
and their motor has brushes inside it. Once the size gets to an 8-inch, the
motor is an induction motor, which is better suited for heavy-duty use.
Jointers are essential for performing most of the
operations that are required to ‘square-up’ a piece of wood. Here’s what I
mean: Let’s say that you have an old piece of wood and you now want to use it
in a project. For our example, let’s say it’s a 2 by 4. Doesn’t matter how
long. Step 1 is to lay the board with the 4” side on the infeed table of the
jointer and proceed to pass the board over the cutterhead as many times as it
takes to make that side flat and smooth. Step 2 is to place that ‘surfaced
face’ against the jointer’s fence, over the infeed table, and pass it over the
cutterhead as many times as it takes to make one edge of the board flat and
smooth. Once these two operations have been done, the board will have a flat
‘face’ (the wide side) and a flat edge…AND they will be ‘square’ (90 degrees)
to each other.
A that point, the board can be sent thru the planer
and planed to the desired thickness, ripped on the table saw to the proper
width and then crosscut sawn to the correct length. All because the jointer was
available to give it a flat surface and a squared-up edge.
Send your questions or comments to:
Toolsmartz@bellsouth.net and we’ll see what we can do to help you.
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