Grade VIII

(Mechanical Drawing)

Lesson 1.

Introductory Talk The plan of the year's work.

(Mechanical Drawing 12 weeks - Group 1, Straight Lines: 2, Circles; 3, Tangents; 4, Planes of Projections; 5, Review; 6, First choice Dado Group of Woodwork - Working Drawing; 7, First choice Cross-lap Group of Woodwork - Working Drawing; 8, Second choice Cross-lap or Dado Group of Woodwork - Working Drawing; 9, Completion of any unfinished drawings and Making stock bills; 10, Figuring stock bills; 11, Structural Design; 12, Decorative Design. (Woodwork the rest of the year—Two Groups, exercises and applications using drawings just made.) (Along with this, inforation concerning lumbering, etc.) Preparation for Demonstration ; Assignment for Lesson 2 Essentials of Woodworking, Appendix III, Sections 3, 4, and 6. Demonstration—

The essential points in making Drawings I. (Group I, Problems in Mechanical Drawing.)

(Copies of the different problems of Group I—One each - should be in the hands of the pupils that they may refer to them as the demonstration is being given.)

Border and cutting lines, spacing the views, blocking-out, dimensions, letters, final lines. Projection and relation of views. Visible and invisible edges. Work Each pupil solve his problem, freehand carefully on scratch paper first, putting on dimensions. Then carefully to full scale with border and cutting lines but no lettering or dimensions, only sheet number and pupil's name.

Rapid workers exchange problems and solve as time allows.

Grade VIII

(Mechanical Drawing)

Lesson 2.

Recitation The names and relative positions of the three views most used in mechanical drawing?

Send a pupil to the blackboard to make three views of a rectangular block having chamfered edges on one side.

Develop the four principles of projection and relation of views.

Letters and figures, how proportioned? Test pupils at the blackboard.

How does a freehand working drawing differ from a mechanical drawing?

Give fully the order of procedure in making a mechanical drawing.

How do you go about determining the placing and spacing of your drawing? Preparation for Demonstration; Assignment for Lesson 3 Essentials, Appendix III, Sections 2 and 5. Demonstration The essential points in making Drawing II. (Group II, Problems in Mechanical Drawing.)

Center-lines; circles; cross-sections and cross-hatching; dimensioning circles. Work Solution of problems in Group II.

Complete any unfinished problems in I.

Rapids workers exchange problems in Group II and solve as time allows.

Grade VIII

(Mechanical Drawing)

Lesson 3.

Recitation—

The conventions - Scale drawings, why? Figures on the drawing vs. the size of the object? Seven kinds of lines - their meanings and how made? When figures cannot be placed between the arrows, what ? What part of a mechanical drawing is to be made freehand ? A broken view? Why used?

Section drawing? Cross-hatching?

Hexagon, octagon, ellipse; how made? Assignment for Lesson 4 Essentials, Review Sections 34 and 36. Demonstration The essential points in making Drawing III. (Group III, Problems in Mechanical Drawing.)

Tangents - Locating centers of arcs and points of tangency. Work Solution of problems in Group III.

Complete any unfinished problems in previous groups.

Rapid workers exchange problems in Group III.

Grade VIII

(Mechanical Drawing)

Lesson 4.

Recitation The steps in squaring rough stock to dimensions?

The steps when the stock is mill-planed on two surfaces?

A true surface? Selection of first surface? When several parts are to be fitted ?

Preliminary tests before beginning to plane?

Planing - Many or few shavings ? Roughened grain ? Planes used ?

Protecting the cutting edge ?

Position of the body? Long or short strokes? Starting and stopping the stroke? Feathering the shaving?

Testing broad surfaces with a straightedge ?

Testing narrow surfaces with winding-sticks?

Explain precisely how to proceed in removing wind. Assignment for Lesson 5—

Essentials, Review Sections 27, 28, 29, 30, 31, 32. Demonstration—

The essential points in making Drawing IV. (Group IV, Problems in Mechanical Drawing.)

Planes of projection. Number and proove the solutions. Work Solution of problems in Group IV.

Complete any unfinished problems in previous groups.

Rapid workers exchange problems in Group IV.

Grade VIII

(Mechanical Drawing)

Lesson 5.

Recitation—

Face side, face edge? Why? How marked?

Planing first edge ? Choice ? Two preliminary tests ?

How place plane to remove high arris? Planes used? Tests?

Finishing second edge? What determines amount to be removed?

Tests?

Finishing second side? Gaging? Testing?

Planing first end ? Tests ? Caution about length ?

Finishing second end ? What limits amount to be planed ? Tests ? Assignment for Lesson 6 Essentials, Sections 46, 47. Demonstration Numbering and lettering the points in the two views of the test problems preparatory to their solution. Work Complete unfinished "Problems."

Solve test Problems.

Rapid workers may begin drawings for Woodwork Group VII.

GRADE VIII. - (Mechanical Drawing)

Lesson 6.

Recitation Two classes of chisels? Their uses?

Four parts to each class?

Three parts to a mallet? The rule in selecting a pounding tool?

The size of a chisel indicated how?

Caution about holding chisel?

Explain fully the cutting action of a chisel. How it wedges, how this is overcome?

Explain fully horizontal paring. Assignment for Lesson 7 Essentials, Sections 48, 49, 50, 51.

The essential points in making the working drawings for Woodwork Group VII.

Work Make a drawing from Woodwork Group VII. Rapid workers make drawing of second choice Woodwork Group VII.

Grade VIII

(Mechanical Drawing)

Lesson 7.

Recitation Vertical paring? How? Position of hands? Amount to be cut at each stroke? Position of worker relative to the line to be cut?

Oblique and curved line paring? Direction of the cut with reference to the grain?

Paring chamfers ? Paring along the grain ? Across the grain ?

Firmer gouge? Bevel inside or outside? How is its size determined ?

Position of the hands in roughing out ? In finishing stroke ? How produce shearing cut? Assignment for Lesson 8 Essentials, Review Sections 52, 53, 54, 55, 56, 57. Demonstration The essential points in making working drawings for Woodwork Group VIII. Work Complete unfinished drawings of Group VII.

Make a drawing from Woodwork Group VIII.

Rapid workers make another selection from Group VIII.

Grade VIII

(Mechanical Drawing)