Setup And Adjustments; Installing Chisel And Bit; 180° Head Rotation; Sharpening Chisel And Bit - Jet JBM-5 Mode D'emploi

After the first cut, the workpiece is
moved. The direction of movement
must allow the chips to clear freely
(Fig 4).
Fig 4
When cutting deep mortises, make the
cut in several stages of approx. 25mm
each, to allow chips to clear.
To prevent breakout at the back of the
workpiece when cutting through
mortises, use a piece of scrap material
under the workpiece as support.
Warning:
Make sure the machine is attached to
a firm and stable support surface, to
prevent it from tipping during
operation. Four holes in the base are
supplied for this purpose.
Always keep your hands well clear of
the rotating bit.
Always close the chuck cover before
you start the machine.
Support long workpieces with helping
roller stands.

7. Setup and adjustments

General note:
Setup and adjustment work may
only be carried out after the
machine is protected against
accidental starting by pulling the
mains plug.

7.1 Installing chisel and bit

Disconnect the machine from the
power source (unplug).
Open the chuck access doors on both
sides of the head.
Insert the chisel bushing (3, Fig 5) with
the hole facing forward into the head.
Insert chisel and bit together.
Tighten the screw (2, Fig 5) just
enough to hold the chisel (4, Fig 5) in
place.
Fig 5
NOTE:
The slot in the chisel should face to
the right or left side only. The opening
will allow chips to escape during
operation.
Push the chisel up as far as possible
into the head. Then lower the chisel
1,5 to 4mm, depending on the type of
wood being worked. Tighten the screw
to hold the chisel in place.
Push the bit up through the chisel
opening as far as it will go. Lock the
drill bit in place with the chuck key.
Loosen the screw and push the chisel
up against the bushing and tighten the
screw. This should provide the proper
distance between the points of the
chisel and the bit.
NOTE: The chisel should be adjusted
parallel. Use the workpiece as a
gauge (Fig 6).
Fig 6
Close the chuck access doors before
starting the machine.
Using bits with shorter shanks:
It will be necessary to attach the
spindle extension.
Place a 10mm open spanner on the
motor spindle and use the chuck key
to unscrew the chuck.
Attach the spindle extension to the
chuck and reinstall.
7.2 180° Head rotation
Remove the three hex socket cap
screws at the base and rotate head
and column 180°.
Doing this will enable you to outboard
mortise taller items.

7.3 Sharpening chisel and bit

The chisel and bit should be kept
sharp for best performance.
Sharpen the bit by using a small file,
following the original shape of the bit.
File the inside edge of the spur (A, Fig
7), the sides of the centre point (B, Fig
7) and the cutting edge inwards toward
the flute of the bit (C, Fig 7)
Fig 7
Do not file the outside edges of the
spur as this will affect the diameter of
the bit.
Sharpen the chisel on the cutting edge
inside only.

8. Maintenance and inspection

General notes:
Maintenance, cleaning and repair
work may only be carried out after
the machine is protected against
accidental starting by pulling the
mains plug.
The mortise requires only minor
maintenance, such as lubrication,
routine adjustments and sharpening of
chisel and bit.