Dake Model Johnson J Saws - Manual (Page 11)

6/02
11
OPERATION
OFF/ON SWITCH
All J-saw machines are equipped with a manual starter with low voltage, dropout protection
and a limit switch. When the machine frame reaches the end of its down travel it contacts the
limit switch, turning off the machine.
HYDRAULIC CONTROL
The hydraulic control cylinder mounted on the rear of the machine is operated by a control
valve mounted on the front of the machine head. To close valve, turn the control to the right.
When the valve is completely closed, the frame will remain stationary at the desired position.
To open valve, turn control to the left. Opening of the valve will control the speed of descent
of frame (or head) and does not control frame weight. This control is mainly used in cutting
pipe or thin-walled tubing, structurals, etc., to prevent plunging of the saw blade.
VISE
The vise can be positioned straight for a 90º cut or at any angle to 45º. The vise swivel jaw
adjusts automatically to any position of the stationary jaw.
VISE QUICK-RELEASE
Consists of the vise half-nut, vise lift, lift handle and a sliding hold-down block to which the
swivel jaw is attached. Move the vise lift handle toward front of the machine to disengage the
vise nut from the vise screw; this allows the swivel jaw to be moved freely. Move the lift
handle towards the rear of the vise to engage the vise nut when clamping.
VISE HANDWHEEL
Used to open and close the vise jaws…vise nut must be fully engaged. Turn handwheel
counterclockwise to open the vise, clockwise to close the vise.
BLADE TENSION HANDLE
Turn the screw handle clockwise as tight as possible. Check every eight operating hours and
retighten to compensate for possible stretching of blades. Consult your blade manufacturer
for the proper PSI tension.
GUIDE ARMS
Loosen the handle on the left guide arm to slide arm along the top of the frame. Guide arms
should be set as close as possible to the work, without interfering.
STOCK STOP GAUGE
Consists of a stock stop assembly and a mounting bar installed in the tip-off block on front of
the machine. The stop assembly can be moved along the bar to indicate correct length for
duplicate cuts. Stock stop rod has a cap screw in the end for making fine adjustments. Turn
rod to extended position (rotated to the right) when measuring stock, and retract the rod
(rotate to left) when cutting.
OPERATING INSTRUCTIONS