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Showing 1 - 15 of 58 comments. A Total Exposure Point value of or greater indicates safe limits have been exceeded and employees are at significant risk of developing HAVS, and controls should be implemented immediately to reduce vibration magnitude exposure.
There are two primary methods that you can use to obtain the vibration magnitude values for power tools:. Because acquiring actual measurements taken with a vibration meter can be time consuming and difficult to perform, many evaluators use the declared values given by the manufacturer. The problem is that even though the declared values are measured according to the relevant ISO standards, the measurements are taken in well-defined situations that do not necessarily represent the values for the specific work-situation.
There can be considerable differences between workplaces and operators. That means that exposures based on declared values can only be rough estimations of the values that an operator will be exposed to when using the tool in real situations. Actual in-use vibration values measured with a meter can vary significantly from the values declared by the tool manufactures.
In-use vibration is the vibration the operator experiences when the tool is running in a real work situation in a specific workplace. This is the most accurate method to determine the actual vibration magnitude exposure. Multiple tests should be performed accounting for all variables, and an average of these tests should be used as the vibration value. The Exposure Duration is not the overall time spent on a specific job. The Exposure Duration is only the trigger time during which the hands are actually exposed to vibration.
When asked, operators tend to overestimate the exposure duration. Therefore, it is better to estimate the exposure duration by observation and measurement of a sample period of typical work. Use maximum production rates to determine the number of repetitions required per 8-hour shift.
This spindle is fitted on a table along with its motor. With this spindle, the grinding wheel can be turned in forward, backward, left, or right direction in running condition. Jobs of excellent finish and accuracy are grinded with it.
These grinders are of the following types:. The surface which has been made plain by shaper or plainer are grinded with this grinder. The cylindrical surface is grinded with a machine in which grinding wheel is fitted on the shaft of a free electric motor.
These are of the following three kinds:. In this type of grinder, the job is rotated in chuck or center and the entire cylindrical surface of the job is grinded. With this grinder finishing of sleeves, pins, rods, taper pins, etc. Pistons of I. This grinder is specifically made for grinding these shapes. These grinders are used to grind small shafts. The diameter of the grinder is much more than that of the job. The crankshaft of motor vehicles is a grinder with this grinder. These are also called crankshaft grinding machines.
This type of grinder is also made in a different form for camshaft grinding. In order to save the shaft from becoming flexible, steady rests are used. Grinding wheels of different shapes are made under this type of grinder. These wheels are given feed and accurate grinding is done as per the shape of the grinding wheel on the moving cylindrical surface. Under this category, three types of grinders are included.
These are:. These grinders are used for grinding jobs of ordinary shape. The principle of an ordinary form grinder is shown in the figure. This type of grinder is used to cut accurate threads.
Grinding wheels of the size and shape of the thread are used. Its principle has been shown in the figure. The principle of the gear grinder is shown in the figure. Grinding wheels of different forms are used in this grinder to cut dents of different sizes and shapes. These grinders are used for grinding round and hollow jobs whether the internal surface of this job is completely round, ditched round, or is in taper.
Small grinding wheels of 3 cm to 5 cm, are used in such grinders. Sometimes grinding wheels of special shape 0.
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