Guarding Machine Tools
William H. A. Johnson · Proceedings of the Institution of Mechanical Engineers · 1902
The Workman's Compensation Act of 1899, together with the exacting requirements of factory inspectors, have compelled engineers $0 pay more attention to the subject of Guarding Machine Tools.Guards are made of various materials, as :-(11.)Cast metal, usually iron.(111.)Sheet metal.(IV.)Hoops, rods, and bars of metal.(V.) Wire work.Before dealing with the qualifications of these materials for guards and the various ways of applying them so as to protect machinery, i t may be well to consider what conditions a perfect guard must fulfil.1st.I t must fence the tool efficiently; in other words, it must protect workmen from all dangerous moving parts of the machine, and thus satisfy the factory inspector.2nd.If possible, i t must be attached to or near the tool ; as if loose, a careless workman will remove it and not replace it, 80 that it ceases to act a8 a guard.3rd.At the same time i t must be so constructed that a workman can move it on one side to oil the machine, adjust a belt (I.) Timber.