Clutch Adjustment - BD HP14 Owner's Manual And Operating Instructions

HP14

CLUTCH ADJUSTMENT

CLUTCH ADJUSTMENT AND REPLACEMENT
The HP14 Slab Saw uses a friction clutch block (bronze 1/2 threaded) and stainless steel threaded drive screw
rod engagement-disengagement system to propel the cast iron carriage/vise. The clutch is comprised of a
lower carriage mounted bronze half threaded (3/8-24) fine left hand threaded block and an upper brass non-
threaded block with adjusting set screws and a center mounting screw.
The lower bronze 1/2 threaded block is disengaged by turning the 1/4" rod lever handle to the 12 o'clock posi-
tion (Photo 10) which is attached to a cam with a machined recess that drops the bronze 1/2 threaded block
into this recess. Because of the threads on the clutch bronze block, it may be necessary to disengage the
clutch by tapping or shaking the 3/8-24 stainless steel left hand threaded rod to assist in clutch disengagement
(Photo 11).
Photo 10 Photo 11
If the feed is not engaging (advancing the carriage/vise forward) when the lever is turned to the 3 o'clock posi-
tion, this indicates either:
• The clutch block threads are worn out (flattened or stripped threads).
• The clutch needs adjustment.
• The feed rod is not turning (i.e. power feed motor non-operable or coupling is loose).
If the clutch engagement is not functioning (i.e. not advancing the carriage vise system forward), it is recom-
mended that adjustments to the clutch be made as follows:
Photo 12
CLUTCH ADJUSTMENT
The clutch system is comprised of a lever to cam assembly that raises and lowers a bronze clutch shoe.
Should the clutch not fully engage and move the carriage, loosen the phillips head screw below the vise table
inside of the carriage and tighten the two allen head screws to depress the bronze pressure block (Photo 12).
Adjust set screws in one-half turn increments. Be sure to retighten countersink screw after each adjustment.
Re-engage the clutch and restart saw to check if feed is working properly. If not, readjust set screws another
1/2 turn, retighten countersink screw and restart saw to check feed.
NOTE: Over time, some bowing or flexure of the main stainless drive threaded rod (3/8-24 fine left hand thread)
may occur, resulting in dragging of the half threaded bronze clutch block against this thread rod when the user
moves the carriage-vise along the rails by hand. This dragging is normal and adjustment of the clutch may not
be necessary for this condition.
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