Document 1QO7rXzeBNE9D1O9kgeqq96Rj

Machine Tools fence, usually of iron pipe sections, should be installed Such fencing should conform to the state code or the specifications of theASI Standard A121, Safety Requirements for Floor and Wall Openings, Ratlings and Toe Boards The operator should never attempt to bghten the work or the tool, caliper or measure the work, feel the edges of the cutting tool, or oil the mill while it is m operation, nor should he nde the table while it is in motion, except that on some large mills, like those used for boring turbine castings, the operator may have to nde the table in order to observe the progress of the work In such cases, he should always be certain that no portion of his body will come in contact with a sta tionary part of the mill Steps or stairs which provide access to the machine or to the work should have a pitch of not more than 50 degrees and should have nonslip treads Stairs with four or more nsers should be provided with a standard handrail 34 in above tread center Milling Machines Milling--machining a piece of metal by bringing it into contact with a rotating multiedged cutter--is done by horizontal and vertical milling machines, by gear hobbers, profiling machines, circular and band saws, and a number of other types of related machines About two of every three milling machine accidents occur when operators unload or make adjustments Other causes of injuries include 1 Failure to draw the job back to a safe distance when loading or unloading 2 Using a jig or vise which prevents close adjustment of the guard 3 Placing the jig or vise-locking arrange ment in such a position that force must be exerted toward the cutter 4 Leaving the cutter exposed after the job has been withdrawn 5 Leaving hand tools on the worktable 6 Failure to clamp the work securely 7 Reaching around the cutter or hob to remove chips while the machine is in motion 8 Removing swarf by hand instead of with a brush 9 Adjusting the coolant flow while the cutter is turning 10 Calipering or measuring the work while the machine is operating 11 Using a rag to clean excess oil off the table while the cutter is turning 12 Wearing gloves, ties, or loose clothing 13 Using cutters incorrectly dressed 14 Stonng cutters incorrectly 15 Attempting to remove a nut from machine arbor by applying power to the machine 16 Striking cutter with hand or arm while setting up or adjusting stopped machine Basic milling machines Regardless of the classification, direction of movement, or special attachments which make varied operations possible on a milling machine, the safeguarding requirements are basically the same To guard the cutter, one of several methods should be employed (Fig 26-7) The hand-adjusting wheels for quick or automatic traverse on some models should be mounted on the shaft by either clutches or ratchet devices so that the wheels do not revolve when the automatic feed is used, or else the wheels should be provided with re movable handles with compression springs so that the handles cannot remain m the wheels unless held in place by the operator The horizontal milling machine should have a splash guard and pans for catching thrown cutting lubricant or lubricant running from the tools The lubricant should be directed on the work in such a way that the distribution setup will not be drawn into the cut bv means of the cutter rotation When possible, all cuts should be made into the travel of the table, rather than away from the direction of travel Metal saws A circular saw for cutting cold metal stock should have a hood guard at least as deep as the roots of the teeth, and the guard should 756