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Tuesday, 26 November 2013

Factors in Successful Grinding

Factors in Successful Grinding Points : Factors in Successful Grinding The beginner in grinding is quite likely to think that too much emphasis is put on the wheel. It may see that a great deal of time is taken to explain about the making of wheel, the selection of the wheel for the job, the care of the wheel, and the action of the wheel. In grinding, think of wheel and the grain, grade, and structure, is very important. In any grinding operation, the rapidly revolving abrasive wheel is the cutting tool. The surface speed of the wheel, in feet or meter per minute, is called the wheel speed. In external cylindrical or taper grinding, and in a large number of internal jobs, the work revolves, and in most surface grinding the, work passes under the wheel. The speed, in feet or meter per minute, that the surface of the work is being ground, is called the work speed. It should be made clear that the best wheel acts best only when the total of wheel, wheel speed, work speed, and cut (feed) is right. In production grinding, the wheel of known classification, the wheel speed, and the work speed are decided upon" the setup is made, and production goes forward. In general machine work and tool making, the man on the machine must know how to select the wheel, mount it on the machine spindle, dress it properly, set up the job, and grind the given surface. In addition to its shape arid size, the factors to be considered in the selection of a grinding wheel and the setup for a given job are:

1. The kind of wheel (the bond) to use.
2. The kind of material to be ground; whether to use a wheel made of aluminum oxide or silicon carbide.
3. The arc or area of contact, for example whether external, internal, or surface grinding.
4. Material being removed by grinding.
5. The finish desired. On these factors depend:
(i) The grain (ii) The grade (iii) and structure of the wheel.
6. Inspection of wheel crack and balance.
7. Getting the wheel ready, setting up, and starting to grind, the considerations are:
(i) Mounting the wheel.
(ii) Dressing the wheel.
(iii) Setting the wheel speed.
(iv) Setting the work speed.
(v) Setting the amount of cross-feed.
(vi) Setting the table traverse (long feed). (vii) Setting the table-reverse dogs.
(viii) Roughing or finishing cut.
(ix) Setting the depth of cut.
(x) Care of wheel loading and glazing.
These factors may appear involved but they are not difficult to understand if one enters, step by step.

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