Page 225 - CITS - ED - Mechanical

ENGINEERING DRAWING - CITS

Symbols with Additional indications: These may be used singly, in combination or combined with an appropriate
symbol given in Table 6.
TABLE 6

Symbol Meaning

Production Method: Milled

Sampling length 2.5 mm

Direction of lay: Perpendicular to
the plane of projection of the view.

Machining allowance 2 mm

Simplified symbols

TABLE 7
Symbol Meaning

A note indicates the meaning
of the symbol

A note indicates the meaning
of the symbols.

Symbols with indication of the Principal criterion of roughness
TABLE 5

SYMBOL

Removal of material by machining is
Optional Obligatory Prohibited MEANING

A surface with a maximum surface
roughness value of 3.2 µm

A surface with a maximum surface
roughness value of 6.3 µm and a
minimum of 1.6 µm

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CITS :Engineering Drawing (Mechanical) - Exercise 9