Support Bearing - Delta 28-248 Instruction Manual

ADJUSTING THE UPPER
BLADE GUIDES AND BLADE

SUPPORT BEARING

Adjust the upper blade guides and blade support
bearings ONLY AFTER the blade has the correct tension
and is tracking properly. To adjust, do the following:
DISCONNECT MACHINE FROM POWER
SOURCE
1. Make sure that the bottom blade guides and support
bearings are not touching the blade.
2. Check the upper blade guide assembly. The blade
guides (A) Fig. 54 should be parallel to the blade. To
adjust, loosen the screw (B) and rotate the complete
guide assembly (C). When the blade guides are parallel
with the blade, tighten the screw (B).
3. Adjust the guides (A) Fig. 55 so that the front edge of
the guides are just behind the "gullets" of the saw teeth.
The complete guide block bracket can be moved in or
out by loosening the thumb screw (C) and turning the
knurled knob (D) Fig. 55. When the guides (A) are set
properly, tighten thumb screw (C).
4. Two set screws (B) Fig. 55 hold the upper blade
guides (A) in place. Loosen the set screws (B) to move
the guides (A). Place them as close as possible to the
side of the blade. (Be careful not to pinch the blade).
Tighten the screws (B).
5. When the blade guide wears to a point that it cannot
be adjusted close to the blade, loosen screw (B) Fig. 55
and reverse the blade guides (A) Fig. 55.
6. The upper blade support bearing (E) Fig. 55 prevents
damage to the set in the saw teeth by keeping the blade
from being pushed too far toward the back. The support
bearing (E) should be set 1/64" behind the blade by
loosening the thumb screw (F) and turning the knurled
knob (G) to move the support bearing (E) in or out.
7. Adjust the blade support bearing (E) so that the back
edge of the blade overlaps the outside diameter of the
ball bearing by about 1/16". The bearing (E) is set on an
eccentric. To change the position, remove the screw (H)
and bearing (E) Fig. 55. Loosen the thumb screw (F),
back out the knurled knob from the set screw. Remove
the hex shaft from the hole, and rotate it to move the
eccentric for the bearing.
C
A
G
E
D
A
B
21
B
Fig. 54
F
H
C
B
A
Fig. 55