Designing such kind of a sleeve involves complicated techniques. The diversity of shapes defined by its cylindrical and plane surfaces determines the complexity and the different types of machines to be used. Also special clamping devices, jigs or fixtures have to be utilized in this kind of production. These facts give us the opportunity to use a lathe with big production rate in a moderate and mass production as well as milling machine and grinding machine with similar capabilities.

Other basic requirements concern the necessary technologies to produce the element. They are directed toward the type of production, methods of controlling the accuracy, choosing a billet, feed and speed of cutting, determination of the duration of the different operations.

Determination of the qualification of the workers, their number, number of machines involved into the production process are also basic factors in a production of a detail.

2. Determining the type of production

The production type can be determined by the production coefficient k. If 250 working days per year are considered each of which with 2* 8 hoursâ€™ shifts per day the following expression for N can be derived:

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Where:

c = working days per year = 250

d = working hours per day =

t = average operating time rate =

q = amount of unit per year = 45000

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Having in mind that the coefficient N is in the range:

- 1 ( 2 for mass production

- 2 ( 10 for large production

- 10 ( 20 for medium production

- above 20 for small production

In this case N = 1.67 so the production type can be defined as mass production.

In order to calculate the time limit for production of the whole lot of 45 000 sleeves, the following formula is to be used:

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Where:

q = amount of unit per year = 45000

d = working hours per day = 16

c = working days per year = 250

Using the same data as in calculating the production type coefficient N...