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1899.

SUBJECT II. MACHINE CONSTRUCTION AND DRAWING.

EXAMINERS:

PROFESSOR T. A. HEARSON, M.INST.C.E.,

AND

J. HARRISON, Esq., M.INST.M.E., Assoc. M.INST.C.E.

GENERAL INSTRUCTIONS.

If the rules are not attended to, the paper will be cancelled.

You may take the Elementary Stage, or the Advanced Stage, or Honours-Part I., or (if eligible) Honours-Part II., but you must confine yourself to one of them.

Put the number of the question before your answer.

You are expected to prove your knowledge of machinery, as well as your capability of drawing neatly to scale. You are therefore to supply details omitted in the sketches, to fill in parts left incomplete, and to indicate, by diagonal lines, parts cut by planes of section.

No credit will be given unless some knowledge of projection is shown, so that, in the Elementary and Advanced stages, at least two views of the example will be required properly projected one from the other. The centre lines should be clearly drawn. The figured dimensions need not be inserted.

Your answers should be clearly and cleanly drawn in pencil. No extra marks will be allowed for inking in.

In the Elementary and Advanced stages the answers to the questions as well as the drawings must be made on the single numbered sheet of drawing paper supplied, for no second sheet or foolscap paper will be allowed.

The value attached to each question is shown in brackets after the question. A full and correct answer to an easy question will secure a larger number of marks than an incomplete or inexact answer to a more difficult one.

Your name is not given to the Examiners, and you are forbidden to write to them about your answers.

You are to confine your answers strictly to the questions asked.

A single accent (') signifies feet; a double accent (") inches.

The examination in this subject lasts for four hours.

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Elementary Stage.

INSTRUCTIONS.

Read the General Instructions on page 1.

Draw one, but not both, of the examples shown on Diagram X. The example should be drawn on the side of the paper on which the Candidate's number is printed.

Also answer briefly any three, but not more than three, of the questions which follow.

Foolscap paper must not be used for this stage. No credit will be given for any work in this stage on foolscap paper.

EXAMPLES, DIAGRAM X.

Only one to be drawn.

1. Valve-rod-end and link-block.

The diagram shows the details of the end of a valve rod, which is to be coupled to a block also shown, designed to fit a double-bar link.

Do not draw the parts separated from one another as in the diagram, but draw all the parts in their proper relative working positions.

Three views are required as follows:—

(a.) A front elevation, the right half of which is to be a section through the axis of the valve rod, and the left half an outside view.

(b.) In projection with (a), and to the right of it, draw a side elevation, the right half of which is to be a section also through the axis of the valve rod, and the left half an outside view.

(c.) Draw a plan projected from (a).

Scale, .

2. Bearing for a shaft.

(70.)

Diagram X shows the details of a swivelling bearing for a shaft. A perspective view of the complete bearing is added for information.

Do not draw the parts separated from one another as in the diagram, but draw them in their proper relative working positions as indicated in the perspective view. The perspective view is not to be drawn.

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(d.) An elevation, as seen when looking in a direction at right angles to the shaft, the right half of which

is to be a section taken through the axis of the shaft, and the left half an outside view.

(e.) In projection with (d), and to the right of it, draw an end elevation, the right half of which is to be a section taken through the centre of the bearing, and the left half as seen from outside.

(f) Draw a plan projected from (e). Scale, .

(70.)

Note.-Dotted lines representing hidden parts are not required to be drawn in either example, nor should the figured dimensions be inserted.

Questions, only three to be answered.

The sketches in answer to these questions should be drawn freehand.

(g.) In the bearing shown in Example 2, Diagram X, explain how the adjustment is made

(1) for the lateral position of the shaft;

(2) for the height of the shaft; and
(3) for the angular position of the shaft.

(10.)

(h.) Draw a section and an end view of a simple form of stuffing-box, suitable for a valve rod, so made that neither studs nor bolts are required for the purpose of tightening the gland. This section is to be shown as taken through the axis of the valve rod.

(10.)

(k.) Sketch and describe three distinct ways by which a flat belt may be retained on the surface of a pulley when running.

(7.) Draw two views of a double the rivets are arranged they are placed in chain. the former arrangement.

(10.)

riveted lap-joint, first when zig-zag, and second when Point out the advantage of (10.)

(m.) Give sketches showing the various ways of constructing and fitting a key to prevent the relative rotation of a shaft and a piece which is mounted on it. Quote an example of the use of each method of fitting, mentioning the difference in the circumstances of each.

(10.)

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