TM 9-243FACTORSTO CONSIDER WHEN USING GAGE BLOCKS - ContinuedError rangeError rangemillionths ofmillionths ofC/assWorkan inchClassWorkan inchIVerifying gages, setting5 to 20IIISetup of grinding, milling40 to 100instruments, and tooland drill machines, andinspection.parts inspection.I ILayout of jigs, fixtures and20 to 40dies, setting instruments,and tool inspection.CARE OF RING AND SNAPGAGES2Always consider the abrasive action of the part onthe gage. Cast iron, steel, and cast aluminum aremore abrasive than brass, bronze, and nonmetalssuch as plastics. Use particular care when gagingcast iron, steel, and cast aluminum.3When gages are stored, arrange them neatly in adrawer or case so that they do not contact othertools or each other.4Always hold the gages in your hands when check-1Always make certain that the surfaces of the partsing. Never clamp them in a vise.gaged and the gage itself are kept free from abra-5At frequent intervals, check all gages for accuracysives, dirt, grit, chips, and all foreign matter.and wear with gage blocks or master gages.CARE OF GAGE BLOCKS1.Observe particular care when using gage blocks tomeasure hardened work. The danger of scratchingis increased when the work is as hard as the block,or harder.2.Never touch the measuring surfaces of blocks anymore than necessary. The moisture from yourhands contains an acid which, if not removed, willeventually. stain the blocks.3.Before using blocks, ensure there is no grease, oil,dirt, or any foreign substances on block.4.Every time a set of blocks is used, all the blockswhich have been cleaned for use must be coveredwith a film of acid-free oil, such as boiled petrolatum,before they are put away. Wipe them with an oiledchamois as you return the blocks to their places inthe case.15-9/(15-10 blank)
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