Machinery's Handbook, 31st Edition
820
Surface Texture Table 5. Lay Symbols
Lay Symbol
Example Showing Direction of Tool Marks
Meaning
Lay approximately parallel to the line representing the surface to which the symbol is applied.
Lay approximately perpendicular to the line representing the surface to which the symbol is applied.
Lay angular in both directions to line representing the surface to which the symbol is applied.
X
X
M
Lay multidirectional.
M
Lay approximately circular relative to the center of the surface to which the symbol is applied.
C
C
Lay approximately radial relative to the center of the surface to which the symbol is applied.
R
R
Lay particulate, nondirectional, or protuberant.
P
P
Scales of Metric Drawings: Drawings made to the metric system are not made to scales of 1 ⁄ 2 , 1 ⁄ 4 , 1 ⁄ 8 , etc., as with drawings made to the English system. If the object cannot be drawn full size, it may be drawn 1 ⁄ 2 , 1 ⁄ 5 , 1 ⁄ 10 , 1 ⁄ 20 , 1 ⁄ 50 , 1 ⁄ 100 , 1 ⁄ 200 , 1 ⁄ 500 , or 1 ⁄ 1000 size. If the object is too small and has to be drawn larger, it is drawn 2, 5, or 10 times its actual size.
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