Tab washers

Similar to the ealeulation of q, it is possible to identify the variability risks assoeiated with the assembly of eomponents, q. In the following example shown in Figure 2.29, a eover and housing (with a eaptive nut) are fastened by a fixing bolt, whieh in turn is seeured by a tab washer. 

For the bending the tab washer operation, the Additional Assembly Variability Risk is given by ... 

Penny-pinehing ean be tragic, for example, when old tab washers, split pins, and pipes are reused (see Section 16.1 h). 

Here are two more examples of penny-pinching. The piston of a reciprocating engine was secured to the piston rod by a nut, which w as locked in position by a tab washer. When the compressor was overhauled, the tightness of this nut was checked. To do this, the tab on the washer had to be knocked down and then knocked up again. This weakened the washer so that the tab snapped off in service, the nut worked loose, and the piston hit the end of the cylinder, fracturing the piston rod. 

Split pins and tab washers should not be reused but replaced every time they are disturbed. Perhaps we cannot be bothered to go to the store for a fresh supply. Perhaps there is none in the store. 

A tab washer may be used, similar to a plain washer with the addition of a tab which is bent up on the hexagon face of the nut, screw or bolt to prevent It working loose. Fig. 12.9(a). 

Tab. 6.1 Development of functional activities in washing machines and dish washers for the next about 5 years (preliminary).

Slip the mesh tab, %" x %" nickel tab, and an 8-32 nut onto the threaded rod. Work these down the threaded rod to the bottom of the cap, with the rod centered in the pleated mesh electrode. Screw the nut tightly to hold the mesh and %" x %" tab firmly down onto the nickel washer. 

Nickel alloy foil tabs. 010 thick, 5 pieces each V2" to %" long and nickel alloy foil washers 1" diameter McMaster- Carr 8912K241-4" x r 1... 

Figure 12 9. Locking washers (a)tab(b) helical spring (c) shake proof (d) spring fixing...

Use bent tabs or crimped sections Use combined fasteners (integral washers, etc) Use integral locators, hooks or lips Use press fits to replace threaded fasteners. 

---