{"id":20971,"date":"2025-08-15T00:27:32","date_gmt":"2025-08-15T08:27:32","guid":{"rendered":"https:\/\/shengenfab.com\/?p=20971"},"modified":"2026-04-14T00:53:41","modified_gmt":"2026-04-14T08:53:41","slug":"true-position-in-gdt","status":"publish","type":"post","link":"https:\/\/shengenfab.com\/ja\/true-position-in-gdt\/","title":{"rendered":"GD&T\u306b\u304a\u3051\u308b\u771f\u306e\u4f4d\u7f6e\uff1a\u5b9f\u751f\u7523\u306b\u304a\u3051\u308b\u610f\u5473"},"content":{"rendered":"
\n\t\t\t\t\t\t
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\u7cbe\u5bc6\u88fd\u9020\u306b\u304a\u3044\u3066\u3001\u6700\u3082\u30b3\u30b9\u30c8\u304c\u304b\u304b\u308a\u3001\u30a4\u30e9\u30a4\u30e9\u3055\u305b\u3089\u308c\u308b\u30b7\u30ca\u30ea\u30aa\u306e\u3072\u3068\u3064\u306f\u3001\u6a5f\u68b0\u52a0\u5de5\u3055\u308c\u305f\u90e8\u54c1\u304c\u5ea7\u6a19\u30ec\u30dd\u30fc\u30c8\u4e0a\u306e\u3042\u3089\u3086\u308b\u5bf8\u6cd5\u30c1\u30a7\u30c3\u30af\u306b\u5408\u683c\u3057\u3066\u3044\u308b\u306b\u3082\u304b\u304b\u308f\u3089\u305a\u3001\u7d44\u7acb\u30e9\u30a4\u30f3\u3067\u9069\u5408\u3057\u306a\u3044\u5834\u5408\u3067\u3059\u3002\u3053\u306e\u4e0d\u4e00\u81f4\u306f\u3001\u307b\u3068\u3093\u3069\u306e\u5834\u5408\u3001\u4f1d\u7d71\u7684\u306a\u30ea\u30cb\u30a2\uff08\u30d7\u30e9\u30b9\uff0f\u30de\u30a4\u30ca\u30b9\uff09\u516c\u5dee\u306b\u4f9d\u5b58\u3057\u3066\u3044\u308b\u3053\u3068\u306b\u8d77\u56e0\u3057\u3066\u304a\u308a\u3001\u3053\u306e\u516c\u5dee\u306f\u3001\u5d4c\u5408\u3059\u308b\u90e8\u54c1\u304c\u3069\u306e\u3088\u3046\u306b\u76f8\u4e92\u4f5c\u7528\u3059\u308b\u304b\u3068\u3044\u30463\u6b21\u5143\u7269\u7406\u5b66\u3092\u8003\u616e\u3057\u3066\u3044\u307e\u305b\u3093\u3002<\/p>\n

\u5e7e\u4f55\u5b66\u7684\u5bf8\u6cd5\u516c\u5dee\uff08GD&T\uff09\u306e\u4e2d\u6838\u6982\u5ff5\u3067\u3042\u308b\u771f\u306e\u4f4d\u7f6e\u306f\u3001\u7406\u8ad6\u7684\u306a\u6570\u5b66\u3068\u73fe\u5834\u306e\u73fe\u5b9f\u3068\u306e\u9593\u306e\u3053\u306e\u30ae\u30e3\u30c3\u30d7\u3092\u57cb\u3081\u308b\u305f\u3081\u306e\u79d1\u5b66\u7684\u306a\u8a00\u8a9e\u3092\u63d0\u4f9b\u3057\u307e\u3059\u3002\u5358\u306b\u76f4\u7dda\u8ddd\u96e2\u3092\u6e2c\u5b9a\u3059\u308b\u306e\u3067\u306f\u306a\u304f\u3001\u4f4d\u7f6e\u516c\u5dee\u306f\u6a5f\u80fd\u7684\u306a\u5883\u754c\u3092\u5b9a\u7fa9\u3057\u307e\u3059\u3002<\/p>\n

\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001\u30c8\u30a5\u30eb\u30fc\u30dd\u30b8\u30b7\u30e7\u30f3\u306e\u80cc\u5f8c\u306b\u3042\u308b\u5de5\u5b66\u7684\u8ad6\u7406\u3001\u88fd\u9020\u306e\u518d\u73fe\u6027\u306b\u4e0e\u3048\u308b\u5f71\u97ff\u3001\u305d\u3057\u3066\u7d44\u7acb\u4e0d\u826f\u3092\u3069\u306e\u3088\u3046\u306b\u4f53\u7cfb\u7684\u306b\u6392\u9664\u3059\u308b\u304b\u306b\u3064\u3044\u3066\u8aac\u660e\u3059\u308b\u3002<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\"GD&T\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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\u30dd\u30b8\u30b7\u30e7\u30f3\u3068\u30a2\u30c3\u30bb\u30f3\u30d6\u30ea\u30fc\u30d5\u30a3\u30c3\u30c8\u306e\u95a2\u4fc2<\/h2>\n

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\u4f4d\u7f6e\u6c7a\u3081\u516c\u5dee\u306e\u7b2c\u4e00\u306e\u76ee\u6a19\u306f\u3001\u30dc\u30eb\u30c8\u30d1\u30bf\u30fc\u30f3\u3068\u30af\u30ea\u30a2\u30e9\u30f3\u30b9\u30db\u30fc\u30eb\u306e\u3088\u3046\u306a\u5d4c\u5408\u90e8\u54c1\u304c\u5e72\u6e09\u3059\u308b\u3053\u3068\u306a\u304f\u4f4d\u7f6e\u3059\u308b\u3053\u3068\u3092\u4fdd\u8a3c\u3059\u308b\u3053\u3068\u3067\u3059\u3002\u5f93\u6765\u306e\u65b9\u6cd5\u304c\u5931\u6557\u3059\u308b\u7406\u7531\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u304c\u3001\u30c8\u30a5\u30eb\u30fc\u30dd\u30b8\u30b7\u30e7\u30f3\u3092\u30de\u30b9\u30bf\u30fc\u3059\u308b\u7b2c\u4e00\u6b69\u3067\u3059\u3002<\/p>\n

<\/p>\n

\u5ea7\u6a19\u516c\u5dee\u3068\u30b9\u30bf\u30c3\u30af\u30a2\u30c3\u30d7\u306e\u554f\u984c\u70b9<\/h3>\n

<\/p>\n

\u4f1d\u7d71\u7684\u306a\u5ea7\u6a19\u5bf8\u6cd5\u6cd5\u306f\u3001\u76f4\u7dda\u7684\u306aX\u3068Y\u306e\u7bc4\u56f2\u3092\u4f7f\u3063\u3066\u6b63\u65b9\u5f62\u306e\u8a31\u5bb9\u7bc4\u56f2\u3092\u8a2d\u5b9a\u3059\u308b\u3002\u3053\u306e\u65b9\u6cd5\u306b\u306f2\u3064\u306e\u91cd\u5927\u306a\u6b20\u70b9\u304c\u3042\u308a\u307e\u3059\u3002\u7b2c\u4e00\u306b\u3001\u7279\u306b\u591a\u7a74\u30d1\u30bf\u30fc\u30f3\u3067\u306f\u516c\u5dee\u306e\u7a4d\u307f\u91cd\u306d\u306b\u3064\u306a\u304c\u308b\u3002\u5bf8\u6cd5\u304c\u9023\u9396\u3057\u3066\u3044\u308b\u3053\u3068\u304c\u591a\u3044\u305f\u3081\u30011\u3064\u306e\u7a74\u306e\u8aa4\u5dee\u304c\u6b21\u306e\u7a74\u306b\u9023\u9396\u3057\u3001\u30d1\u30bf\u30fc\u30f3\u5168\u4f53\u306e\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u304c\u3059\u3050\u306b\u72c2\u3063\u3066\u3057\u307e\u3046\u306e\u3067\u3059\u3002<\/p>\n

<\/p>\n

\u7b2c\u4e8c\u306b\u3001\u305d\u306e\u00b1\u6b63\u65b9\u5f62\u306e\u6975\u7aef\u306a\u89d2\u306b\u7a74\u3092\u958b\u3051\u308b\u3068\u3001\u30bf\u30fc\u30b2\u30c3\u30c8\u4e2d\u5fc3\u304b\u3089\u306e\u5b9f\u969b\u306e\u5bfe\u89d2\u8ddd\u96e2\u304c\u8a31\u5bb9\u76f4\u7dda\u504f\u5dee\u3088\u308a\u3082\u5927\u304d\u304f\u306a\u308b\u3002\u5ea7\u6a19\u8a08\u7b97\u3092\u4f7f\u7528\u3059\u308bCMM\u3067\u306f\u3001\u30dc\u30eb\u30c8\u304c\u5b8c\u5168\u306b\u901a\u904e\u3067\u304d\u305f\u3068\u3057\u3066\u3082\u3001\u3053\u306e\u90e8\u5206\u304c\u4e0d\u5408\u683c\u306b\u306a\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n

<\/p>\n

\u6a5f\u80fd\u7684\u5883\u754c\uff08\u4eee\u60f3\u6761\u4ef6\uff09<\/h3>\n

<\/p>\n

\u30a2\u30bb\u30f3\u30d6\u30ea\u306e\u30d5\u30a3\u30c3\u30c8\u306f\u3001\u6700\u7d42\u7684\u306b\u306f\u4e2d\u5fc3\u70b9\u3060\u3051\u3067\u306a\u304f\u3001\u7269\u7406\u7684\u306a\u30af\u30ea\u30a2\u30e9\u30f3\u30b9\u304c\u91cd\u8981\u3067\u3059\u3002\u30c8\u30a5\u30eb\u30fc\u30dd\u30b8\u30b7\u30e7\u30f3\u306f\u3001\u30d5\u30a1\u30f3\u30af\u30b7\u30e7\u30ca\u30eb\u30d0\u30a6\u30f3\u30c0\u30ea\u30fc\uff08\u4eee\u60f3\u6761\u4ef6\u306e\u6982\u5ff5\u3068\u5bc6\u63a5\u306b\u95a2\u9023\uff09\u3092\u5b9a\u7fa9\u3059\u308b\u3053\u3068\u3067\u3001\u3053\u306e\u3053\u3068\u3092\u8a8d\u8b58\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n

<\/p>\n

Instead of merely asking “where is the exact center of this hole?”, True Position asks, “does the physical surface of this hole intrude into the space the fastener needs?” As long as the actual produced hole does not violate this cylindrical boundary, the assembly is guaranteed to succeed.<\/p>\n

<\/p>\n

\u5e7e\u4f55\u5b66\u7684\u306a\u512a\u4f4d\u6027<\/h3>\n

<\/p>\n

\u30dc\u30eb\u30c8\u3068\u30d4\u30f3\u306f\u5186\u5f62\u3067\u3042\u308b\u305f\u3081\u3001\u5fc5\u8981\u306a\u8a31\u5bb9\u7bc4\u56f2\u3082\u5186\u5f62\u3067\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u3002\u6b63\u65b9\u5f62\u306e\u5ea7\u6a19\u30be\u30fc\u30f3\u304b\u3089\u5186\u5f62\u306e\u4f4d\u7f6e\u516c\u5dee\u30be\u30fc\u30f3\u306b\u79fb\u884c\u3059\u308b\u3053\u3068\u3067\u3001\u8a31\u5bb9\u53ef\u80fd\u306a\u88fd\u9020\u504f\u5dee\u306e\u9818\u57df\u304c\u7d0457%\u5897\u52a0\u3057\u307e\u3059\u3002<\/p>\n

<\/p>\n

\u3053\u308c\u306b\u3088\u308a\u3001\u30aa\u30d5\u30bb\u30c3\u30c8\u306e\u5408\u8a08\u304c\u5186\u5f62\u5236\u9650\u5185\u306b\u53ce\u307e\u308b\u9650\u308a\u3001\u6a5f\u68b0\u52a0\u5de5\u8005\u306fX\u65b9\u5411\u307e\u305f\u306fY\u65b9\u5411\u306b\u81ea\u7531\u5ea6\u304c\u5897\u3057\u307e\u3059\u3002\u30d1\u30fc\u30c4\u306e\u9069\u5408\u6027\u3068\u4fe1\u983c\u6027\u3092\u7dad\u6301\u3057\u306a\u304c\u3089\u3001\u30b9\u30af\u30e9\u30c3\u30d7\u3092\u6e1b\u3089\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n

<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\"\u6b63\u65b9\u5f62\u306e\u7f60\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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<\/p>\n

GD&T\u306b\u304a\u3051\u308b\u771f\u306e\u4f4d\u7f6e\u306e\u5b9a\u7fa9<\/h2>\n

<\/p>\n

\u30c8\u30a5\u30eb\u30fc\u30dd\u30b8\u30b7\u30e7\u30f3\u306f\u8ddd\u96e2\u3092\u76f4\u63a5\u6e2c\u5b9a\u3059\u308b\u3082\u306e\u3067\u306f\u306a\u3044\u3002\u6b63\u78ba\u3067\u6570\u5b66\u7684\u306b\u5b8c\u5168\u306a\u5ea7\u6a19\u7cfb\u306b\u5bfe\u3059\u308b\u30d5\u30a3\u30fc\u30c1\u30e3\u306e\u4f4d\u7f6e\u3092\u5236\u5fa1\u3059\u308b\u516c\u5dee\u3067\u3042\u308b\u3002<\/p>\n

<\/p>\n

\u7406\u8ad6\u4e0a\u306e\u4f4d\u7f6e\u3068\u5b9f\u969b\u306e\u4f4d\u7f6e<\/h3>\n

<\/p>\n

On a modern engineering drawing, the “True Position” is the ideal target, defined by Basic Dimensions. These dimensions are enclosed in rectangular frames (e.g., | 15.0 |) and carry no tolerance of their own.<\/p>\n

<\/p>\n

\u30e1\u30fc\u30ab\u30fc\u306b\u305d\u306e\u6a5f\u80fd\u3092\u6b63\u78ba\u306b\u4f1d\u3048\u308b \u3079\u304d\u3067\u3042\u308b<\/em> \u306f\u5b8c\u74a7\u306a\u4e16\u754c\u3067\u3059\u3002\u4f4d\u7f6e\u5236\u5fa1\u8a18\u53f7 (\u21aaSm_2295) \u306f\u3001\u5b9f\u969b\u306e\u52a0\u5de5\u5f62\u72b6\u304c\u305d\u306e\u5b8c\u74a7\u306a\u76ee\u6a19\u304b\u3089\u3069\u306e\u7a0b\u5ea6\u9038\u8131\u3059\u308b\u3053\u3068\u3092\u8a31\u5bb9\u3059\u308b\u304b\u3092\u6307\u793a\u3057\u307e\u3059\u3002<\/p>\n

<\/p>\n

\u30dd\u30b8\u30b7\u30e7\u30f3\u30fb\u30b3\u30f3\u30c8\u30ed\u30fc\u30eb\u3068\u306f\uff1f<\/h3>\n

<\/p>\n

Position is specifically used to locate “features of size”\u2014such as drilled holes, dowel pins, or milled slots. It controls the center point, axis, or center plane of these features. It does not control the location of planar surfaces (which is the job of Profile tolerance).<\/p>\n

<\/p>\n

\u81ea\u7531\u5ea6\u3068\u7d44\u7acb\u30ed\u30b8\u30c3\u30af<\/h3>\n

<\/p>\n

To ensure a part is manufactured and inspected consistently, it must be “immobilized” in 3D space. This is achieved by referencing a Datum Reference Frame (DRF) in the feature control frame. The primary, secondary, and tertiary datums constrain the part’s six degrees of freedom (translation and rotation).<\/p>\n

<\/p>\n

\u91cd\u8981\u306a\u3053\u3068\u306f\u3001CMM \u306e\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3092\u5bb9\u6613\u306b\u3059\u308b\u305f\u3081\u306b\u3001\u30c7\u30fc\u30bf\u30e0\u3092\u6063\u610f\u7684\u306b\u9078\u629e\u3057\u3066\u306f\u306a\u3089\u306a\u3044\u3068\u3044\u3046\u3053\u3068\u3067\u3059\u3002\u6700\u7d42\u30a2\u30bb\u30f3\u30d6\u30ea\u306e\u7269\u7406\u7684\u306a\u73fe\u5b9f\u3092\u53cd\u6620\u3057\u305f\u3082\u306e\u3067\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u3002<\/p>\n

<\/p>\n

\u677f\u91d1\u30d6\u30e9\u30b1\u30c3\u30c8\u304c\u30b7\u30e3\u30fc\u30b7\u306b\u5bfe\u3057\u3066\u5e73\u3089\u306b\u30dc\u30eb\u30c8\u3067\u56fa\u5b9a\u3055\u308c\uff08\u4e00\u6b21\u57fa\u6e96A\uff09\u3001\u53d6\u308a\u4ed8\u3051\u30ec\u30fc\u30eb\u306b\u62bc\u3057\u4e0a\u3052\u3089\u308c\uff08\u4e8c\u6b21\u57fa\u6e96B\uff09\u3001\u7279\u5b9a\u306e\u30c0\u30dc\u30d4\u30f3\uff08\u4e09\u6b21\u57fa\u6e96C\uff09\u306b\u30a2\u30e9\u30a4\u30e1\u30f3\u30c8\u3055\u308c\u3066\u3044\u308b\u5834\u5408\u3001\u3053\u308c\u3089\u306e\u6b63\u78ba\u306a\u7279\u5fb4\u304c\u30c7\u30fc\u30bf\u30e0\u3067\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u3002<\/p>\n

<\/p>\n

\u30d5\u30a3\u30fc\u30c1\u30e3\u30fc\u30b3\u30f3\u30c8\u30ed\u30fc\u30eb\u30d5\u30ec\u30fc\u30e0\u306e\u89e3\u91c8<\/h2>\n

<\/p>\n

\u30d5\u30a3\u30fc\u30c1\u30e3\u30fc\u30fb\u30b3\u30f3\u30c8\u30ed\u30fc\u30eb\u30fb\u30d5\u30ec\u30fc\u30e0\uff08FCF\uff09\u306f\u3001\u5358\u306a\u308b\u5f62\u72b6\u6307\u793a\u66f8\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u8a2d\u8a08\u30c1\u30fc\u30e0\u3068\u30e1\u30fc\u30ab\u30fc\u9593\u306e\u62d8\u675f\u529b\u306e\u3042\u308b\u6cd5\u7684\u5951\u7d04\u3067\u3059\u3002<\/p>\n

<\/p>\n

\u76f4\u5f84\u8a18\u53f7<\/h3>\n

<\/p>\n

\u30a8\u30f3\u30b8\u30cb\u30a2\u30ea\u30f3\u30b0\u306e\u56f3\u9762\u3067\u3088\u304f\u3042\u308b\u3001\u30b3\u30b9\u30c8\u306e\u304b\u304b\u308b\u9593\u9055\u3044\u306f\u3001\u4f4d\u7f6e\u516c\u5dee\u5024\u306e\u524d\u306b\u3042\u308b\u76f4\u5f84\u8a18\u53f7\uff08\u2300\uff09\u306e\u7701\u7565\u3067\u3059\u3002\u30c9\u30ea\u30eb\u7a74\u306e\u3088\u3046\u306a\u5186\u7b52\u5f62\u306e\u30d5\u30a3\u30fc\u30c1\u30e3\u30fc\u306b\u9069\u7528\u3059\u308b\u5834\u5408\u3001\u76f4\u5f84\u8a18\u53f7\u306f\u8a31\u5bb9\u7bc4\u56f2\u304c3\u6b21\u5143\u306e\u5186\u7b52\u3067\u3042\u308b\u3053\u3068\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n

<\/p>\n

\u3053\u306e\u8a18\u53f7\u304c\u306a\u3044\u5834\u5408\u3001GD&T\u898f\u683c\u3067\u306f\u3001\u516c\u5dee\u57df\u306f2\u3064\u306e\u5e73\u884c\u306a\u5e73\u9762\uff08\u4e8b\u5b9f\u4e0a\u30b9\u30ed\u30c3\u30c8\uff09\u3067\u69cb\u6210\u3055\u308c\u308b\u3068\u898f\u5b9a\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u4e38\u3044\u7a74\u306b\u4e38\u3044\u30dc\u30eb\u30c8\u3092\u901a\u3059\u5834\u5408\u3001\u5e73\u9762\u7684\u306a\u516c\u5dee\u57df\u306f\u7269\u7406\u7684\u306b\u975e\u8ad6\u7406\u7684\u3067\u3042\u308a\u3001\u6cd5\u7684\u306b\u3082\u88fd\u9020\u696d\u8005\u3092\u4e0d\u5fc5\u8981\u306b\u53b3\u3057\u3044\u5883\u754c\u7dda\u306b\u5236\u9650\u3057\u307e\u3059\u3002<\/p>\n

<\/p>\n

\u7d20\u6750\u4fee\u6b63<\/h3>\n

<\/p>\n

\u516c\u5dee\u5024\u306e\u5f8c\u306b\u3001\u6700\u5927\u6750\u6599\u6761\u4ef6\uff08MMC\uff09\u3092\u8868\u3059\u4fee\u6b63\u8a18\u53f7\uff08\u4e38\u306bM\u304c\u4e00\u822c\u7684\uff09\u304c\u8868\u793a\u3055\u308c\u308b\u3053\u3068\u304c\u3088\u304f\u3042\u308a\u307e\u3059\u3002MMC\u306f\u3001\u90e8\u54c1\u304c\u305d\u306e\u30b5\u30a4\u30ba\u5236\u9650\u306e\u7bc4\u56f2\u5185\u3067\u6700\u5927\u91cf\u306e\u6750\u6599\u3092\u542b\u3080\u72b6\u614b\u3092\u6307\u3057\u307e\u3059\uff08\u4f8b\u3048\u3070\u3001\u8a31\u5bb9\u3067\u304d\u308b\u6700\u5c0f\u306e\u30af\u30ea\u30a2\u30e9\u30f3\u30b9\u30db\u30fc\u30eb\uff09\u3002<\/p>\n

<\/p>\n

\u9006\u306b\u3001L\u306fLeast Material Condition (LMC)\u3092\u8868\u3057\u3001\u4e00\u822c\u7684\u306b\u30a2\u30bb\u30f3\u30d6\u30ea\u30d5\u30a3\u30c3\u30c8\u3088\u308a\u3082\u91cd\u8981\u306a\u8089\u539a\u3092\u4fdd\u8b77\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002\u8a18\u53f7\u304c\u306a\u3044\u5834\u5408\u3001\u516c\u5dee\u306e\u30c7\u30d5\u30a9\u30eb\u30c8\u306fRFS\uff08Regardless of Feature Size\uff09\u3068\u306a\u308a\u3001\u7a74\u306e\u5b9f\u969b\u306e\u30b5\u30a4\u30ba\u306b\u95a2\u4fc2\u306a\u304f\u3001\u4f4d\u7f6e\u516c\u5dee\u306f\u53b3\u5bc6\u306b\u56fa\u5b9a\u3055\u308c\u307e\u3059\u3002<\/p>\n

<\/p>\n

\u30c7\u30fc\u30bf\u30fb\u30b7\u30fc\u30b1\u30f3\u30b9<\/h3>\n

<\/p>\n

\u30d5\u30ec\u30fc\u30e0\u306e\u6700\u5f8c\u306b\u8a18\u8f09\u3055\u308c\u3066\u3044\u308b\u30c7\u30fc\u30bf\u30e0\uff08\u4f8b\uff1aA\u3001B\u3001C\uff09\u306f\u30a2\u30eb\u30d5\u30a1\u30d9\u30c3\u30c8\u9806\u306b\u4e26\u3093\u3067\u3044\u308b\u306e\u3067\u306f\u306a\u304f\u3001\u53b3\u5bc6\u306a\u7269\u7406\u7684\u30bb\u30c3\u30c8\u30a2\u30c3\u30d7\u306e\u9806\u5e8f\u3092\u6307\u793a\u3057\u3066\u3044\u308b\u3002\u4e00\u6b21\u30c7\u30fc\u30bf\u30e0\u306f\u6700\u521d\u306e\u63a5\u89e6\u70b9\u3092\u5b9a\u3081\uff083\u81ea\u7531\u5ea6\u3092\u5236\u9650\uff09\u3001\u4e8c\u6b21\u30c7\u30fc\u30bf\u30e0\u306f\u65b9\u5411\u3092\u5b9a\u3081\u3001\u4e09\u6b21\u30c7\u30fc\u30bf\u30e0\u306f\u6700\u7d42\u8ef8\u3092\u30ed\u30c3\u30af\u3059\u308b\u3002<\/p>\n

<\/p>\n

A-B-C\u304b\u3089A-C-B\u306b\u9806\u5e8f\u3092\u5909\u3048\u308b\u3068\u3001\u691c\u67fb\u4e2d\u306e\u90e8\u54c1\u306e\u30af\u30e9\u30f3\u30d7\u65b9\u6cd5\u304c\u5b8c\u5168\u306b\u5909\u308f\u3063\u3066\u3057\u307e\u3044\u307e\u3059\u3002\u30a2\u30bb\u30f3\u30d6\u30ea\u306e\u5931\u6557\u3092\u907f\u3051\u308b\u305f\u3081\u306b\u306f\u3001\u56f3\u9762\u4e0a\u306e\u30c7\u30fc\u30bf\u30e0\u306e\u9806\u5e8f\u306f\u3001\u90e8\u54c1\u304c\u6700\u7d42\u7684\u306a\u7528\u9014\u3067\u7269\u7406\u7684\u306b\u3069\u306e\u3088\u3046\u306b\u62d8\u675f\u3055\u308c\u308b\u304b\u3092\u5b8c\u5168\u306b\u53cd\u6620\u3057\u305f\u3082\u306e\u3067\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u3002<\/p>\n

<\/p>\n

\u6700\u5927\u7d20\u6750\u6761\u4ef6\uff08MMC\uff09\u3068\u30dc\u30fc\u30ca\u30b9\u516c\u5dee<\/h2>\n

<\/p>\n

\u8abf\u9054\u30de\u30cd\u30fc\u30b8\u30e3\u30fc\u3084\u88fd\u9020\u30a8\u30f3\u30b8\u30cb\u30a2\u306b\u3068\u3063\u3066\u3001MMC\u6539\u8cea\u5264\u306e\u9069\u7528\u306f\u3001\u6a5f\u80fd\u7684\u54c1\u8cea\u3092\u72a0\u7272\u306b\u3059\u308b\u3053\u3068\u306a\u304f\u90e8\u54c1\u30b3\u30b9\u30c8\u3092\u4e0b\u3052\u3001\u6b69\u7559\u307e\u308a\u3092\u5411\u4e0a\u3055\u305b\u308b\u6700\u3082\u52b9\u679c\u7684\u306a\u65b9\u6cd5\u306e\u3072\u3068\u3064\u3067\u3042\u308b\u3002<\/p>\n

<\/p>\n

\u30dc\u30fc\u30ca\u30b9\u8a31\u5bb9\u306e\u8ad6\u7406<\/h3>\n

<\/p>\n

MMC\u306e\u6982\u5ff5\u306f\u3001\u30af\u30ea\u30a2\u30e9\u30f3\u30b9\u3068\u3044\u3046\u7269\u7406\u7684\u73fe\u5b9f\u306b\u4f9d\u5b58\u3057\u3066\u3044\u308b\u3002\u7a74\u304c\u305d\u306e\u6700\u5c0f\u8a31\u5bb9\u9650\u754c\uff08MMC\uff09\u3067\u6b63\u78ba\u306b\u958b\u3051\u3089\u308c\u305f\u5834\u5408 \u30d5\u30a1\u30b9\u30ca\u30fc<\/a> has very little room to wiggle; therefore, the hole’s center must be positioned almost perfectly. However, if the machinist drills the hole closer to its upper size limit (making the hole larger), the fastener now has more clearance.<\/p>\n

<\/p>\n

Because of this extra clearance, the hole’s center can drift further from its True Position, and the bolt will still pass through smoothly. This additional allowable drift is called Bonus Tolerance.<\/p>\n

<\/p>\n

\u30c8\u30fc\u30bf\u30eb\u30fb\u30c8\u30ec\u30e9\u30f3\u30b9\u3068\u30b3\u30b9\u30c8\u30fb\u30a4\u30f3\u30d1\u30af\u30c8\u306e\u8a08\u7b97<\/h3>\n

<\/p>\n

\u8a08\u7b97\u306f\u7c21\u5358\u3060\uff1a<\/p>\n

<\/p>\n

Total Position Tolerance = Specified Tolerance + (Actual Hole Size – MMC Size)<\/strong><\/p>\n

<\/p>\n

\u4f8b\u3048\u3070\u300110.0mm\u304b\u308910.2mm\u306e\u5bf8\u6cd5\u3067\u3001MMC\u3067\u306e\u4f4d\u7f6e\u516c\u5dee\u304c\u23000.1mm\u3067\u3042\u308b\u7a74\u3092\u8003\u3048\u3066\u307f\u3088\u3046\u3002<\/p>\n

<\/p>\n