Adjusting Blade Tension; Tilting The Table - Delta 40-640 Instruction Manual

ADJUSTING BLADE TENSION
Tension is applied to the blade when the blade tension
lever (A) is in the rear position, as shown in Fig. 17. When
the lever (A) is moved forward, as shown in Fig. 18, blade
tension is released.
To increase blade tension, turn knob (8) Fig. 18, clockwise
and to decrease blade tension, turn knob (8) counterclock-
wise. When adjusting blade tension, lever (A) should be
in the forward position, as shown in Fig. 18. NOTE: It is
necessary to adjust the blade tension knob (8) only when
the blade is removed from both upper and lower blade
holders and a new or different type of blade is assembled
to the holders. It is not necessary to adjust blade tension
when the blade is removed and replaced in only the upper
blade holder as in performing inside CUlling operations.
Adjusting the blade for proper tension is usually accomp-
lished by trial and error; however, a good method to use
is to pluck the rear of the blade, like a guitar string after
the tension lever (A) Fig. 18, is moved to the rear. A high
pitched tone of the blade should be heard and this usually
indicates proper tension. Finer blades require more ten-
sioning (a higher pitched sound) while thicker blades
require less tension.
TILTING THE TABLE
The table on your scroll saw can be tilted 45 degrees to
the left for bevel CUlling operations by loosening table lock
handle (A) Fig. 19, tilt the table to the desired angle and
tighten lock handle (A). NOTE: The table lock handle (A)
can be repositioned by removing screw (0) and removing
and repositioning handle (A) on the hex rod located
underneath the hub of the handle.
When bevel CUlling, the holddown (8) Fig. 20, can be
adjusted to lay flat on the stock by loosening screw (C)
and tilting the holddown (8) accordingly. Then tighten
screw (C).
If the workpiece is too thick, causing the stock to contact
the holddown arm, the complete holddown assembly must
be removed, since thick stock is heavy enough to resist
lifting off the table during the blade up stroke.
Fig. 17
Fig. 18
Fig. 19
Fig. 20
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