Page 150 - Turner 1st sem Practicals

Dressing and truing the grinding wheel
Objective : This shall help you to
• dress and true a grinding wheel of a pedestal grinder for tool grinding.

Abrasive wheels that develop any of the conditions of Make sure that the spindle is fixed in position.
loading, glazing, grooving and out-of-round must be dressed Add a few drops of lubricating oil to the spindle.
and trued.
Switch off the power at the isolator switch.
‘Dressing’ is the operation of cleaning or removing new c
abrasive particles on the cutting surface of the wheel. Clean around the work-rest and the clamp, with a brush.

‘Truing’ a wheel is the operation of removing material from Loosen the clamp.
the cutting face. This squares up the surface of the wheel Slide the rest away from the wheel far enough for the lugs
and makes it to run concentrically with the axis.
of the dresser to fit behind the rest. The discs should just
Loading and glazing require ‘dressing’. clear the wheel face. (Fig 4)
Grooved and out-of-round wheels require
‘truing’.

The tool most commonly used to true or dress a grinding
wheel consists of a revolving metal cutter or roller fitted
with a long handle. (Fig 1)

The revolving cutter is forced against the surface of the
wheel being dressed. The action of the roller is to crush
the surface of the wheel to free the abrasive particles.
(Fig 2)

Tighten the clamp.
The following procedure is to be followed when dressing a Put on a pair of close-fitting safety goggles.
grinding wheel with a disc type dresser. (Fig 3)
Turn the wheel a full revolution, by hand to check that all
Select a suitable size dresser for the wheel face. is clear.
Check that the metal discs or stars revolve freely, and that Switch on the power at the isolator switch, and switch on
they are not badly worn out. the grinding machine.
Hold the handle of the dresser firmly with both hands.

Producltion & Manufacturing : Turner - Exercise 1.3.42 137