Minitom
Instruction Manual
20
A newly dressed cut-off wheel will give an optimum cut. A badly
maintained and dressed cut-off wheel demands a higher cutting
pressure which will result in more frictional heat. The wheel may also
bend and cause a wry cut. A combination of both factors may result
in damage to the cut-off wheel.
Cut-off wheels should be dressed as follows:
Check that there is enough coolant in the coolant tank.
Clamp the dressing stick in the specimen holder
(use the double parallel vice if available as this will hold the
dressing stick more securely).
Let the cut-off wheel rotate on minimum speed and cut the
dressing stick the normal way.
Never dress the cut-off wheel manually as a slight twisting of the
dressing stick may very easily damage the thin cut-off wheels.
Cut-off wheels must be inspected before use.
To test a Diamond/CBN cut-off wheel, perform a ring test:
Suspend the cut-off wheel using an index finger or a pencil.
With a pencil (not metal), gently tap the cut-off wheel around the
edge.
− The wheel passes the test if it gives a clear metallic tone
when tapped.
− The wheel fails the test if the sound is dull or muted. This
indicates that the cut-off wheel is cracked and must not be
used.
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