Global Machinery Company BG150A, BG200A, BG125A Changing a grinding wheel high speed wheel

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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