Delta 28-348 Adjusting Lower Blade Guides and Blade Support Bearing, Changing Speeds

5.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).

6.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.

7.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.

8.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.

ADJUSTING LOWER BLADE GUIDES AND BLADE SUPPORT BEARING

Adjust the lower blade guides and blade support bearing after the upper guides and bearing have been adjusted.

1. DISCONNECT MACHINE FROM POWER SOURCE.

2.Adjust the front edge of the guide blocks (B) Fig. 56 so that they are just behind the “gullets” of the saw teeth. Turn the knurled knob (C) Fig. 56 to make this adjustment. Check the support bearing (D) Fig. 56. It should not be touching the back of the blade.

3.Loosen the two screws (A) Fig. 56. Move the guides

(B) as close as possible to the side of the blade, being careful not to pinch the blade. Tighten screws (A).

4.Turn the other knurled knob (E) to adjust the lower blade support bearing (D) Fig. 56 so that it is about 1/64" behind the back of the blade.

	F
G	H
E
	C
D
	B
A
B	A
	Fig. 55

E		B
	A	A

B

C

D

Fig. 56

CHANGING SPEEDS Fig. 57

An advantage of this machine is that it can be changed instantly from a slow-speed metal cutting band saw to a high- speed wood cutting band.

DISCONNECT MACHINE FROM POWER SOURCE.

Be certain that the band saw is in the “off” position and the power is disconnected when changing from either metal- to-wood cutting or from wood-to-metal cutting.

When using the machine for cutting wood (3000 SFM), pull the shifter knob (A) Fig. 57 all the way out so that the lugs of the clutch (B) are engaged with the hub (C) of the drive pulley. This action will disengage the clutch (D) from the hub

(E)of the gear that transmits power through the gear box. It may be necessary to rotate the pulley manually in order to line up the clutch lugs with the slots in the hub of the pulley. This action provides a direct drive from the motor pulley to the drive pulley, by-passing the gear box.

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