Dimensions of Cast-iron Flange Couplings.

Diameter
of shaft
D		Diameter
of flange
F		Thickness
of flange
T		Diameter
of boss
B		Depth at
boss
L		Number
of
bolts		Diameter
of bolts
d		Diameter of
bolt circle
C
1½ 7¼ 7⁄8 3½ 25⁄8 35⁄8 5½
2 87⁄8 11⁄16 43⁄8 33⁄16 4 3⁄4 6¾
2½ 105⁄8 1¼ 55⁄16 3¾ 47⁄8 81⁄8
3 123⁄8 17⁄16 6¼ 45⁄16 4 1 9½
3½ 131⁄8 15⁄8 71⁄8 47⁄8 4 1105⁄16
4 14 1¾ 8 57⁄16 6 111¼
4½ 155⁄8 2 87⁄8 6 611⁄812½
5 173⁄8 21⁄8 913⁄16 65⁄8 6 1¼1313⁄16
5½ 18¼ 25⁄1610¾ 7¼ 61¼14¾
6 197⁄8 2½115⁄8 7¾ 6 13⁄8 16

The projection of the shaft p varies from 1⁄4 inch in the small shafts to 1⁄2 inch in the large ones.

Exercise 24: Cast-iron Flange Coupling.—Draw the views shown in fig. 24 of a cast-iron flange coupling, for a shaft 4½ inches in diameter, to the dimensions given in the above table. Scale 4 inches to a foot.

VII. BEARINGS FOR SHAFTS.

Fig. 25.

An example of a very simple form of bearing is shown in fig. 25, which represents a brake shaft carrier of a locomotive tender. The bearing in this example is made of cast iron and in one piece. Through the oval-shaped flange two bolts pass for attaching the bearing to the wrought-iron framing of the tender. With this form of bearing there is no adjustment for wear, so that when it becomes worn it must be renewed.