Global Machinery Company BG150A - Manual (Page 10)

Changing a grinding wheel
(high speed wheel)
Important. Prior to changing
a wheel, ensure the grinder is
turned off and the power plug
is removed from the socket.
Make sure that the
replacement wheel is rated at
3000RPM or higher.
1. Remove the retaining screw
and take off the tool rest (7).
2. Remove the retaining screw
and take off the eye shield
bracket (9) and eye
shield (1).
3. Take off the third retaining
screw and remove the outer
guard (3).
4. Remove the retaining nut
(see note below for correct
direction of rotation), outer
flange and the wheel.
Note. The wheel on the left-
hand side of the grinder has a
left-hand thread and is
unscrewed in a clockwise
direction. The wheel on the
right-hand side of the grinder
has a right-hand thread and is
unscrewed in an
anti-clockwise direction.
5. Fit the replacement wheel
on the shaft ensuring that
there is a blotter between
the wheel and clamp
washers on each side of the
wheel, and ensure the
wheel is a slide fit (not
loose) on the spindle.
6. Replace the retaining nut.
(See the Note above
regarding the direction of
rotation of the nut).
7. Hold the wheel whilst you
tighten the nut. Do not
over tighten.
8. Replace the guard and eye
shield assembly.
9. Re-adjust the tool rest and
eye shield.
10. Rotate the wheel by hand
to check for free
movement and proper
adjustments.
11. Plug in the grinder, put
on eye protection, stand
to one side and run the
grinder at full speed for several minutes.
Changing the sharpening wheel (low speed
wheel for Model NTS2000A)
The NTS2000A is a combination Bench Grinder / Sharpener,
fitted with a wet bath on the sharpening wheel.
The sharpening wheel rotates at a much slower rate at
130RPM, and together with the water bath assists to keep
the part being sharpened cool and thus not damaging the
cutting edge.
The water also assists in keeping the wheel clean.
Water should be drained at the completion of the
sharpening task via the small drain hole on the bottom of
the water bath. Ensure the rubber plug is firmly replaced.
When filling the bath with water ensure the water is clean
and fill the bath sufficiently to allow the wheel to be
approx 12mm into the water. As you add the water to the
bath, the sides of the wheel will become wet, thus
indicating the depth of the wheel in the water. Do not
overfill the bath.
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