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And in Connecticut in August, a nail-gun incident highlighted the importance of training and supervision, as horseplay between two carpenters almost turned deadly. The New Haven Register reported that carpenter Eric Haslob was in the hospital recovering from surgery to repair his heart after fellow carpenter Joseph Dupont fired a finish nail into Haslob''s heart by accident as the two were fooling around on the job. A supervisor told the paper he had warned the two friends against horseplay just the day before.

Mark/B-LOC: Using keyless locking devices in place of keys, splines, and shrink or press fits typically means savings in other areas of machine design, such as smaller shafts and bearings and simplified machining. PT components can be positioned anywhere along a shaft without regard to keyway placement or access for mounting or removal tools. Keyless locking devices require only torque wrench access for installation and adequate hub strength of mounted components.Carl/Ringfeder: The main reasons to use locking devices are to eliminate backlash in a connection, eliminate troublesome assembly or disassembly later on, and to have some adjustment to a connection during the lifetime of the component. Traditional shrink fit and press fit methods of attaching components to shafts don''t allow for easy adjustment or removal. Some connections will never be loosened; so attaching them with a locking device only makes sense when using it facilitates assembly. Employing keyless mtdlawnmower locking devices in the design means smaller shaft mtdlawnmower sizes because the stress concentration factors of keyways is eliminated. Smaller shaft mtdlawnmower sizes, in turn, mean smaller bearings and other mating components can be employed.