Instructions for labor protection when working on grinding and grinding machines

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OCCUPATIONAL SAFETY AND HEALTH
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Instructions for labor protection when working on sharpening and grinding machines. Full document

Occupational Safety and Health

Occupational Safety and Health / Standard instructions for labor protection

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Safe Operation

Safety Precautions

1. Installation of abrasive wheels on machines should only be carried out by specially designated, trained installers or service technicians.

2. Before installation, carefully inspect the circle and check for the absence of cracks by lightly tapping (in a suspended state) with a wooden hammer weighing 200 - 300 g. A working circle when tapped gives a clear, ringing sound, a faulty one produces a dull, rattling sound.

3. Circles with a diameter of 150 mm or more must have a test stamp or sticker - the serial number of the circle and the signature of the person responsible for the test. The use of wheels of the specified sizes without a test mark is prohibited. Test data for each wheel is recorded in the wheel test log.

4. When installing on the machine, the circle must be checked for runout. Wheel editing may only be done with a special device. Checking the wheel with a notch, chisel or other similar tool is not permitted.

5. At each machine or group of machines on which work is carried out with circles of different diameters, a sign is posted in a visible place indicating the permissible working circle of the circles used and the rotation speed of the machine spindle per minute. Operating peripheral speeds should not exceed the norms.

6. The diameter of the circle hole should exceed the spindle diameter by 0,1 - 1,5 mm, depending on the size of the outer diameter of the circle.

7. Fastening the wheel when installing it on a machine (spindle) is permitted only with the help of two clamping flanges of the same diameter. The diameters of the clamping flanges must be at least 1/3 of the diameter of the circle.

8. Between the flanges and the circle on both sides, it is necessary to install gaskets made of elastic material (thick paper, cardboard, rubber, etc.) with a thickness of 0,1 to 1 mm, depending on the diameter of the circle. The gaskets must cover the entire clamping surface of the flanges and protrude outward along the entire circumference by at least 1 mm.

9. Tighten the spindle nuts using a wrench only. The use of a chisel and hammer to tighten nuts is strictly prohibited.

10. Before starting work, the wheel installed on the machine must be subjected to short-term idle rotation at operating speed:

with a diameter of up to 400 mm - within 2 minutes. (at least);
with a diameter over 400 mm - within 5 minutes. (no less).

11. The rotating protruding ends of the spindle and fasteners are protected with protective covers.

12. The gap between the circle and the safety visor should be no more than 6 mm.

13. When processing products held in hands with abrasive wheels, use handholds. The handholds must be movable, allowing them to be installed in the required position as the circle is activated.

14. The gap between the edge of the tool rest and the working surface of the grinding wheel should be less than half the thickness of the work being sanded, but not more than 3 mm. The edges of the tool rests on the side of the grinding wheel should not have potholes, chips or other defects.

15. Before starting work, you must ensure that the wheel is in good working order, the machine and the dust suction device are reliable (by external inspection).

16. Do not start work if there is no protective screen or side walls.

17. Immediately report to the foreman any noticed malfunctions of the machine, such as, for example:

17.1. The circle beats during rotation.

17.2. Bearings overheat.

17.3. When the circle is rotated, the machine trembles.

17.4. The wheel guard or drive guard is missing or faulty.

17.5. The drive belt slips or the stitching of its ends is unreliable.

17.6. The handpiece or the starting device of the machine is faulty.

17.7. Deep furrows formed on the circle.

17.8. The wheel has worn out and needs to be replaced.

17.9. The protective grounding of the machine is broken.

18. While operating the machine, you must stand to the side relative to the plane of rotation of the circle.

19. Bring the workpiece to the circle smoothly, avoiding impacts and jolts of the workpiece against the circle.

20. Working with the side (end) surfaces of circles is allowed only if these circles are specifically designed for this type of work.

21. When sharpening, hold the tool securely in your hands to prevent it from getting jammed between the tool rest and the wheel.

22. As the emery wheel operates, move the safety movable visor and, after moving, secure it firmly.

23. If the diameter of the circle has decreased due to wear, the rotation speed of the circle can be increased, but the operating peripheral speed should not exceed that permissible for the given circle.

24. The hand rests should be firmly secured in their working position after each rearrangement. Rearranging the handholds during work is not allowed.

25. It is strictly forbidden to process parts on sharpening and grinding machines while wearing gloves.

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