TM 9-3445-106-14&P
FRONT OPERATED
F-18, F-24 BACK GAUGE - INSTRUCTIONS
This back gauge has been adjusted and aligned at the factory and is shipped mounted on the Shear to save assembly
time, as well as possible damage in transit.
Adjustment of this back gauge may have been disturbed slightly in shipping. To check and reset, after Shear has been
adjusted:
I.
Tighten all set screws between operating wheel and righthand bracket, including those around ratchet assembly.
Turn operating wheel until indicator shows a setting of one inch. Insert stock in machine, making sure it is
squarely against back gauge bar for entire length of cut. Cut two pieces in this manner. Measure the second
piece cut for width and parallelism.
II
If piece is not parallel, loosen split collar at right hand end of connecting shaft between brackets, and by turning
connecting shaft, move left hand end of back gauge' bar in or out as needed. Tighten split collar and take a cut. If
still not parallel, repeat above.
III.
If indicator does not show true width of piece as cut, adjust as follows after parallel setting is made: With indicator
set at one inch, cut a strip of stock and check with a micrometer. Dismount indicator gear cover by removing three
screws holding cover to indicator. Loosen set screws in counter pinion and set indicator to correct width as
measured. DO NOT MOVE BACK GAUGE. Adjust gears so no backlash exists, and tighten set screws. Check
setting by cutting another strip and repeat if necessary. Grease indicator gears lightly and replace gear cover.
IV.
To adjust ratchet between flexible shaft and right hand bracket, loosen check nut and move 5/8 set screw (near
ratchet on bracket between right hand gauge bracket and flexible shaft) in or out to increase or decrease ratchet holding
power. Do not remove ratchet entirely as it holds gauge setting. Each notch of ratchet wheel = .006" movement of gauge
bar.
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