APPENDIX B.
EXAMINATION PAPERS SET BY THE SCIENCE
AND ART DEPARTMENT.
SUBJECT II.—MACHINE CONSTRUCTION AND
DRAWING.
Examiners, Prof. T. A. Hearson, M.Inst.C.E., and
J. Harrison, Esq., M.Inst.M.E.
General Instructions.
If the rules are not attended to, the paper will be cancelled.
You may take the Elementary, or the Advanced, or the Honours paper, 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 power 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 at least two views of one of the examples 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.
All figures must be drawn on the single sheet of paper supplied, for no second sheet will be allowed.
The value attached to each question is shown in brackets after the question. But a full and correct answer to an easy question will in all cases secure a larger number of marks than an incomplete or inexact answer to a more difficult one.
Your name is not given to the Examiner, and you are forbidden to write to him about your answers.
You are to confine your answers strictly to the questions proposed.
A single accent (´) signifies feet; a double accent (´´) inches.
The examination in this subject lasts for four hours.
First Stage or Elementary Examination. 1885.
Instructions.
Read the General Instructions above.
Answer briefly any three, but not more than three, of the following questions, and draw two, but not more than two, of the examples.
Questions.
(a.) Show two methods by which a cotter may be prevented from slacking back. (6.)
(b.) Sketch the brasses for a bearing, and show how they are prevented from turning in the pedestal. (6.)
(c.) Explain the object of the construction of the connecting rod end shown in fig. 78. Describe how the adjustment must be made and how it is locked. (10.)
(d.) Show the form of the Whitworth screw thread by drawing to scale a part section of two or three threads taking a pitch of 1½ inches. Figure the dimensions on the sketch. How many threads to the inch are used on an inch bolt? (10.)
(e.) Make a sketch showing how the adjustment is made in the sliding parts of machine tools: as, for example, in the slide rest of a lathe. (10.)
(f.) Describe with sketches two methods by which the joints are made in connecting lengths of cast-iron pipes. (6.)
Figs. 77 and 78.
Examples to be drawn.
1. Jaw for four-screw dog chuck for 5´´ lathe. Draw the two views as shown (fig. 77). Scale full size.
(Note.—The other three jaws of the chuck are not to be drawn.) (35.)
Fig. 79.
2. Connecting rod end. Draw the two views as shown, partly in section (fig. 78). Draw full size. (35.)
3. Hooke's coupling. Draw the three views shown (fig. 79), adding any omitted lines where the views are incomplete. Draw to scale of 1⁄4 full size. (35.)
Figs. 80 and 81.
First Stage or Elementary Examination. 1886.
Instructions.
Read the General Instructions (page 102).
Answer briefly any three, but not more than three, of the following questions, and draw two, but not more than two, of the examples.
Questions.
(a.) Give sketches showing how the cutting tool of a lathe or other machine is secured in place. (6.)
(b.) Make a sketch of a stud, describe how it is screwed into place, and state some circumstances under which it is used in preference to a bolt. (6.)
(c.) Give sketches showing one method of attaching the valve rod to an ordinary slide valve. (6.)
(d.) Sketch a connecting rod end, with strap, gib, and cotter. Explain the use of the gib. (10.)
(e.) Explain the use of the quadrant for change wheels for a screw-cutting lathe shown in Example 1, fig. 80, by making a sketch showing it in place on a lathe with wheels in gear. (10.)
(f.) Sketch one form of hanger suitable for supporting mill-shafting. (10.)
Fig. 82.
Examples to be drawn.
1. Quadrant for change wheels for screw-cutting lathe. Draw the two views shown (fig. 80). Scale half-size. (35.)
2. Crank-shaft. Draw the two views as shown, partly in section (fig 81). Scale 1⁄8 full size. (35.)
3. Ball bearing for tricycle. Draw the two views as shown, partly in section (fig. 82). Draw full size. (35.)
First Stage or Elementary Examination. 1887.
Instructions.
Read the General Instructions (page 102).
Answer briefly any three, but not more than three, of the following questions, and draw two, but not more than two, of the examples.
Questions.
(a.) Explain how the piston rings in Example 1, fig. 84, are made so that the piston may work steam-tight in the cylinder. How are these rings got into place? (8.)
(b.) Give two views of a double riveted lap joint for boiler-plates. (8.)
(c.) Show by sketches how a wheel is fixed on a shaft by means of a sunk key. Explain how the key may be withdrawn when it cannot be driven from the point end. (8.)
(d.) Give sketches showing the construction of a conical metal lift or puppet valve and seating. (10.)
(e.) With the aid of sketches explain how a piston rod is made to work steam-tight through the end of the cylinder. (10.)
(f.) Explain how the slotting machine ram of Example 8, fig. 85, may be made to move up and down when at work. How is the length of the stroke altered, and what is the object of the slotway in the upper part of the ram? (10.)
Examples to be drawn.
1. Piston for steam-engine. Draw and complete the two views shown (fig. 84), the top half of the left-hand view to be in section. Scale 1⁄2 size. (30.)
Figs. 83 and 84.
2. Plan and sectional elevation of a footstep bearing for an upright shaft (fig. 83). Draw and complete these views. Scale 1⁄4 size. (35.)
Fig. 85.
3. Ram of slotting machine. Draw and complete the two elevations shown (fig. 85). The tool-holders must be drawn in their proper positions in the ram, and not separate as in the diagram. Scale 1⁄4 size. (35.)
First Stage or Elementary Examination. 1888.
Instructions.
Read the General Instructions on p. 102.
Answer briefly any three, but not more than three, of the following questions, and draw two, but not more than two, of the examples.
Questions.
(a.) Give sketches showing how the separate lengths of a line of shafting may be connected together. (8.)
(b.) What is the object of using chipping or facing strips in fitting up machine parts? Give one or two examples. (8.)
(c.) Give sketches showing how you would grip and drive a round iron bar for the purpose of turning it between the centres of a lathe. (10.)
Figs. 86 and 87.
(d.) Explain the action of the governor shown in Example 1 (fig. 86). (10.)
(e.) Describe in detail how the mud-hole door in Example 2 (fig. 88) is removed for the purpose of cleaning the boiler and how it is replaced and the joint made steam-tight. (10.)
(f.) Describe how the parts of the spur wheel in Example 3 (fig. 87) are put together, and explain why the wheel is made in segments. (10.)
Fig. 88.
Examples to be drawn.
1. Loaded governor for small gas engine. Draw and complete the two views, partly in section as shown (fig. 86). Scale full size. (35.)
2. Mud-hole mouth-piece for Lancashire boiler. Draw and complete the two views shown (fig. 88). Scale 3⁄8ths. (35.)
3. Point for segments of large spur wheel. Draw and complete the views shown (fig. 87). Scale 3⁄16ths.
Note.—As the radius of the wheel is too large for your instruments, the circumference at the joint may be set out straight, as in a rack. (35.)