Before commencing the wheel dressing
procedure be aware that a large quantity of grinding dust can be released and it is most
important that suitable face protection and a dust mask are worn. Grinding wheels are
brittle and run at high speed and inhaling grinding dust may cause some severe respiratory
diseases. Treat grinding operations as always potentially dangerous. Do not use chipped
or cracked wheels.
Raise the grinding head to the upright position and
fit the grinding wheel (107) to the motor spindle (91). Note the left-hand thread on the
knurled retaining nut (93). Check the wheel is secure and rotate by hand ensuring it spins
true. Fit the bottom guard. Press the “Grinder” button being aware that at this
stage, the integrity of any new wheel is unknown and should always be regarded as suspect
until it has operated at speed for at least one minute. During this initial “run
in” stage, stand behind the wheel guard with no bystanders around and do not touch
the wheel with the dressing stick.
When satisfied of the wheel’s integrity, hold
the dressing stick against the wheel’s periphery so as to dress a radius on the
corners of the grinding wheel. Slightly more material should be removed from the outer
lower edge (away from motor) as per Fig.13. This will approximate the final wheel shape
which should hold form throughout its life. The grinding wheel will require periodic
dressing to refresh the cutting grit. The form which the wheel takes should be maintained
as long as the grinder is used for profiling the whole tooth and not just the tooth face
or back individually.
When a new wheel is installed on the grinder, it may
require shaping. If it does not require shaping, it still may need to be trued. Truing the
wheel ensures that it is perfectly round, as it is centred on the arbor. This is necessary
to eliminate vibration. Both truing and shaping are done with the dressing stick that is
supplied with the grinder. Replacement dressing sticks are also available from your
dealer. Diamond tipped dressers are also available.
The shape of the wheel will affect the shape of the
tooth being ground. Due to the unique design of the Dinasaw Profiler, the wheel shape
is ultimately a function of the cams, as it wears evenly over all contact areas. If you
are trying to change the shape of a tooth profile (i.e. increasing the hook angle), you
will find that the wheel will wear more in one area and will have to be dressed as a
result. The wheel shape should look like that in Fig. 13.
