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Issue link: https://mms.epubxp.com/i/155490
quality gaging tips Columnist Error x 2 Gage Block Part While it is not the best practice, some users may not have a master disc to set the gage zero setting, but use a gage block instead. Since the gage block sits on the anvil flat and the part may sit in the worn hollow section of the anvil, bias is introduced and errors are seen. 60 MMS September 2013 mmsonline.com arises as to how often the gage should be checked for wear? This is a rather difficult question. There are many influences—the material of the parts, the number of parts measured, the gaging pressure, whether the part is rotated, etc. But as is always the case, a little effort and good recordkeeping will dictate what the wear patterns may be and how of ten the gages need a wearing inspection. Finally, what is allowable wear? Again, knowing the situation makes all the difference. If the gages are designed for millionth measurement, then no wear can be afforded. Replacements must be made at the first sign of influence. When large tolerances are being measured, however, it is not that critical. Typically, 5 percent of part tolerance may be allowed for wear. The thing to remember is that when using any gage, think of wear as an enemy, one that is always trying to steal an extra micron. Set your sights on theft prevention and stop wear before it happens.