This chamfer checking dial gage will give you a direct reading of the outer diameter of a chamfered hole. The larger gages such as the one shown above, have 3-winged plungers. Smaller gages are also available with full conic plungers. Two forms are available: for chamfers with an angle of less than 90° and for chamfers with angles from 90° to 127° The standard dial indicator is graduated in .001" but also available with .0001" digital or .0001" mechanical graduations. The accuracy for reading chamfers is ±.001" on 0-90° models and ±.002" on 90-127° models, regardless of which indicator you use. The base of the Chamfer Gage is manufactured by Barcor (USA) but the dial indicator varies from supplier to supplier. You'll most often find this tool with a Starrett indicator or a CDI indicator, usually with a vanity dial. AccuPro Gold Chamfer Gage, SPI Chamfer Gage, Starrett Chamfer Gage, Dialsink (Brunswick Instrument) and the Dyer Chamfer Gage are examples. It's a sturdy gage with a cleverly simple design. It does require "mastering" and this is done as follows: on the back cover of the gage you'll find the words "Set To" followed by a value, such as .020. Now it's a matter of setting the gage to this value while it's being held flat on a surface plate (the plunger pushed all the way in). We suggest you inscribe this value into the metal or plastic back cover because the label will eventually wear off. Unless you've lost this value, no other setting masters are needed.
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