With the jointer the edge of the table acts as a chip
breaker and it wants/needs to be as tight (within reason) as
possible to the cutterhead. The bigger the gap the more
likelihood that you'll experience greater (larger) tear-out.
Its just like a hand plane in this respect.
With the "old style" dovetailed tables the table can only
move along one line and is set up to clear the cutterhead at
one point (tightest) and the gap opens as the table is moved
onna 'count of the cutter head is round. For a graphic
example of this take a 45 triangle and set it against a can
of beans. Note where the triangle touches the mid-point of
one of the quadrants. Notice where its farther apart.
Because of the geometry the "new style" parallelogram tables
maintain a tighter (but not even) gap 'tween the edge of the
table (the opening) and the cutterhead throughout its
travels up and down. Please note, the gap isn't the same
throughout the table's travel. That little trick would
require a wee bit more injineering and moving parts.
Anyway, while this isn't possible with an "old style" system
(though the "old style" system works pretty well) you
do/should get a better cut/edge with the parallelogram
I never thought about the tables as chip breakers. I kinda figured it
was for table adjustment or something.(advertising gimic)
Will the tables adjust for coplaner(?) better/as well as the dovetail
style? Had a hell of a time getting my 6 in. jet outfeed table on the
same plane as the infeed. I don't have a good straightedge yet.
Thanks very much for the lesson
Greetings and Salutations....
On Fri, 31 Oct 2003 10:31:40 -0600 (CST), email@example.com wrote:
As for the adjustment....I don't have one of these units
(although if someone has a DJ-20 they want to contribute to a
good home...) But it is my understanding that the table adjustment
mechanism has eccentric cams that allow the angle of the tables
to be adjusted to get them parallel.
As for the straight edge...DAGS. Actually, you don't
have to...here is my contribution to the discussion:
Within limits, you can get as LONG a straight edge as
you are willing to deal with. However, note that the
longer the edge the greater the chance that the flexibility
of the material will take over and cause the test to
However, for lengths up to 5', I suspect that
a 1x4 or 1x6 or so would be PLENTY stiff enough.
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