Fig. 11. Series resistance spot welding development set-up. the manufacturer’s tolerances. The tooling was reworked to match precisely, and since reinstallation in the beam builder, has given no further problems. Brace Dispensing Mechanisms In the original brace storage and dispensing device (Figure 5) there was a tendency to pick off more than one brace from time to time. This was solved by careful design and placement of brace spacers which maintain brace flange alignment and also transmit the stacking spring load through the stack of braces to the retaining/pick-off surface of the present helical brace dispenser (Figure 7). Presently, there are occasions when a brace fails to dispense. It has been determined that this has been caused by improper installation of the braces when loading the canister. Care must be taken to assure that all braces are properly stacked and aligned, and free within the canister, i.e., clear of the dispensing helix drive rod and not bound against any of the brace guide surfaces within the canister. Control Devices There are 173 operational detection devices located throughout the machine to monitor every function of the machine. They provide start and operation complete signals to the machine as the beam cap is rolled for one bay length of 1.5 m and
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