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Fig 10
!
If the grindstones wear unevenly, producing crests, dips or rounded edges, they should
be dressed out using a suitable wheel dressing tool. (A selection of stone dressing tools are
available in the Axminster catalogue.)
Switch the grinder on and allow it to run for at least one minute. Rest the dressing tool on the
tool rest and advance it to the stone until it touches the maximum diameter; gently move the
dresser back and forth across the face of the stone until all irregularities have been removed
and the edges of the stone are nice and sharp.
!
PLEASE NOTE
This is not a procedure that can be
rushed, it must be carried out
slowly and steadily.
Dressing the wheel using
a Wheel Dressing Stick or
Devil stone
Part No. DEVILS
CHANGING A GRINDING WHEEL
Reset the spark guards and tool rest as for "setting up the
grinder" instructions. Reconnect the grinder to the mains
supply, give the grinder a 'short burst', by switching it on
and off quickly. Check the grinder is not subject to any
undue vibration. If the grinder does vibrate, strip it down
again and check that the bush (if fitted) is correctly
positioned and is the correct size for the stone and the
spindle. Check the bore of the stone is correct. If these all
seem correct refit and carryout the 'quick burst' procedure
again. If the machine is still vibrating, discard the stone
and replace with another one. Run up to speed normally.
Leave the machine running for at least one minute before
carrying out any work. Apply a workpiece and check that
the spark guard is correctly positioned and that the tool
rest is securely fixed.
If necessary dress the new stone lightly to ensure a 'good
face' and concentricity.
DRESSING A STONE
13
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