Page 51 - CITS - Fitter - Trade Theory

FITTER - CITS

Precautions while using pedestal grinder

1 An operator must be fully trained and instructed in the safe use, care, and protection from abrasive wheels
before use. Fasten the pedestal and bench grinders on a solid surface securely.
2 Ensure all the guards are in place and secure before using a grinder.

3 Adjust tool rests to within 3 mm (1/8 in.) of wheels. Never adjust rests while the wheels are moving. Work rest
height should be on a horizontal centre line of the machine spindle.
4 Maintain 6 mm (1/4 in.) wheel exposure with a tongue guard or a movable guard.

5 Check that the wheels have blotters on each side.
6 Check the wheel fits properly to the spindle when mounting. If it is loose, get another wheel.
7 Tighten the nuts before you turn the grinder on.
8 Before you plug in the grinder, manually spin the wheel to make sure it is spinning freely.

9 Safety procedures to follow when using bench and pedestal grinders
10 Make sure the cables are not damaged and in good condition.
11 Keep the cables out of the work area.
12 Wear proper personal protective equipment:
13 Eye, ear and face protection,

14 Metatarsal safety boots, where required, and
15 Respiratory protection may be required, depending on the work.
16 Wear gloves only where necessary and if there is no risk of entanglement. Make sure all guards are in place.
Inspect the wheel for chips or cracks before using

1 Stand to one side of the grinder until the wheel reaches operating speed
2 Bring work into contact with the grinding wheel slowly and smoothly without bumping.
3 Apply gradual pressure to allow the wheel to warm up evenly. Use only the pressure required to complete a
job.
4 Move the work back and forth across the face of the wheel.
5 This movement prevents grooves from forming.
6 Wait for the piece to cool before touching the end.

7 Wheels are made only for grinding certain items.
8 Do not grind rough forgings on a small precision grinding wheel.
9 Support dressing tool so you can apply leverage without undue effort
10 Dress wheels regularly. Do frequent, light dressings rather than one heavy dressing.

11 Support dressing tools so you can apply leverage without undue effort.
12 With revolving cutter dressing tools, use the lugs as anchors.
13 Replace worn wheels if you cannot dress it.
14 Ensure the grinder speed does not exceed the operating speed marked on the wheel.
15 Visually inspect wheels for possible damage before mounting.

36

CITS : CG & M - Fitter - Lesson 6