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ENGINEERING DRAWING - CITS

Fig 8 Fig 9

Spline 6 x 28 x 32 IS:2327 (Fig 10)
The splines may be straight sides or involuted sided (IS:2327 and IS:3665). The dimensions for straight sided
splines for machine tools are given in IS:2610. Designated no. of splines x min. dia x max.dia 1.5 (IS:2327).

Fig 10

Circlips

Circlips are fastening devices used to provide shoulders for positioning or limiting the movement of parts in an
assembly. (Fig 1) Circlips are also called “retaining rings” IS: 3075 part 1, 2, and 3)
The rings are generally made of materials having good spring properties so that the fastener may be deformed
elastically to a considerable degree and still spring back to its original shape. This permits the circlips to spring
back into a groove or other recess in a part or they may be seated on a part in a deformed condition, so that they
grip the part by functional means. Circlips are manufactured from spring steel with high tensile and yield strength.

Types: There are two types.
Internal circlips (Fig 2): This type of rings are assembled in holes, bores or housing.
Circlips for bores (IS:3075 - Part II): These are available for bores of nominal diameter range 8 to 300 mm in
normal type and 20 to 100 mm in heavy type.
These are made from spring steel of grade 70 C6 or 75 C6.
External circlip (Fig 3): This type of circlips are installed on shafts, pins,studs and similar parts.
Circlips for shafts Normal type (N) and heavy type (H).
These are available for shafts dia 3 mm to 300 mm.

Heavy type: These are suitable for shafts dia 15 mm to 100 mm.

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CITS :Engineering Drawing (Mechanical) - Exercise 8