plug gauge

noun

1. engineering an accurately machined plug used for checking the diameter of a hole Compare ring gauge

Example Sentences

If it be the collar gauge, then the plug gauge is virtually discarded as a standard, except in that if the plug gauge be not used at all it may be kept as a standard of the size to which the collar gauge must be restored when it has worn sufficiently to render restoration to size necessary.

From Project Gutenberg

But the use of such gauges in this way would rapidly wear them out, causing the plug gauge and also the collar to get smaller than its designated size, hence such gauges are intended to fit the work without friction, and at the same time without any play or looseness whatever.

From Project Gutenberg

Obviously then either the reamer must be so made that its size may be constantly adjusted to take up the wear, as in the adjustable reamer, or else if solid reamers are used there must be a certain limit fixed upon as the utmost permissible amount of wear, and the reamer must be made above the standard size to an amount equal to the amount of this limit, so that when the reamer has worn down it will still bore a hole large enough to admit the plug gauge.

From Project Gutenberg

Suppose, for example, that the limit is 1⁄1000 of an inch, then a plug gauge may be made that is 1⁄1000 of an inch taper, and if the large end of this plug will enter the hole, the latter is too large, while if the small end will not enter, the hole is too small.

From Project Gutenberg

Now suppose that the plug gauge be accepted as the standard to which the reamer is to be made, and that to allow for reamer wear the reamer is made, say, 1⁄2000 inch larger than the plug gauge, the work being made to the collar gauge.

From Project Gutenberg