4. Detail drawings shall, as far as possible, classify the different
kinds of works, such as castings, forgings, shafts, levers, piping, etc.
Different kinds of work shall not be shown on the same detail drawing.
5. All shop drawings liable to repetition shall be traced and
blue-printed. All temporary details, requiring only one copy, may be
made on sketch sheets and press copied.
6. A shop drawing is to be considered as an order or instruction to the
shop, and not merely as a statement or illustration. For this purpose it
must convey clearly and distinctly all the information necessary to make
the article.
7. Every dimension necessary to the execution of the work is to be
clearly stated by figures on the drawing, so that no measurements need
to be taken in the shop by scale. All measurements to be given with
reference to the base or starting point from which the work should be
laid out, and also with reference to center lines.
8. All figured dimensions on drawings to be plain, round vertical
figures, not less than one-eighth inch high, and formed by a line of
uniform width and sufficiently heavy to insure printing well. No thin,
sloping, or doubtful figures, or diagonal-barred fractions will be
tolerated. All figured dimensions below two feet to be expressed in
inches.
9. All center lines to be alternate dot and dash in fine black line. All
dimension lines to be double dot and dash, with a central space for the
figure, and of such strength as to show on blue-print more faintly than
lines of drawing. Lines of drawing to be bold and clearly defined in
proportion to the scale, and may be shade-lined by making the right-hand
and bottom lines heavier. No ornamental shading or other “frills”
allowed on shop drawings.
10. Every drawing, whether whole or half-sheet, shall have the title,
date, scale and number of the sheet stamped in lower right-hand corner,
and the quarter and eighth sheets printed on top.
11. The name of the drawing, as given in the title, is invariably to
consist of two divisions in one line separated by a hyphen. The first
division is to state the general name of the thing or machine, and the
second name is to clearly designate the part or parts represented (or if
a general view should so state). The wording of titles should be
submitted to the chief engineer or head draughtsman for approval.
12. Each drawing shall bear the name of the draughtsman and examiner,
the surname being used without initials.
13. Drawings of piping details shall be made in diagram form, using
standard symbols.
14. All detail parts for standard or repetition work shall be shown
unassembled as far as possible.