Example 2 Barrel Plating of Small Coil Springs and Brush Holders

Small coil springs and brush holders are illustrative of parts suitable for barrel plating. Production requirements for plating these parts in horizontal barrels are given in Table 6. Equipment specifications are as follows:

Equipment

Specification

Plating tank (1330 L, or 350 gal)

1.8 by 1.2 by 0.76 m (6 by 4 by 2-2 ft)

Other tanks (605 L, or 160 gal)

0.91 by 1.2 by 0.76 m (3 by 4 by 2-2 ft)

Power rectifier (2000 A)

9 to 15 V

Dimensions of rectifier

0.91 by 1.2 by 2.4 m (3 by 4 by 8 ft)

Centrifugal dryer

0.61 by 0.61 by 0.76 m (2 by 2 by 2-2 ft)

Baking oven

1.2 by 0.91 by 2.4 m (4 by 3 by 8 ft)

Equipment floor space

12 m2 (125 ft2)

Access area behind line

6.3 m2 (68 ft2)

Access area in front

9.3 m2 (100 ft2)

Other tanks in the list above refer to cleaning tanks, acid pickle tanks, hot-water tanks, and three cold-water rinse tanks.

Table 6 Production requirements for cadmium plating of coil springs and brush holders in a horizontal barrel

Production

Coil

Brush

requirements

spring

holder

Weight per piece

14 g (| oz)

9 g (— oz) 16

Pieces plated per hour

7200

3800

Area plated per hour

22 m2 (240 ft2)

17 m2 (180 ft2)

Minimum thickness

4 pm (160 pin.)

8 pm (320 pin.)

Automatic Plating. The primary selection factor for automatic plating is cost. The volume of work must be sufficient to warrant installation of the equipment.

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