Micrometers

Micrometers allow measuring the external dimensions of components tthe hundredth of a millimetre. The part is positioned inside a semi-circular frame and is fixed with a spindle, which comes out due tthe ratchet thimble being turned. The measurements are shown by scales on the handle. These tools are necessary, for example, for checking a crankshaft or camshaft in a car.

Types of micrometers

These products differ in the way the information is displayed: in the catalogues, you can find the following varieties:

• Mechanical. The results are shown on the sleeve scale on the handle. As a rule, the price of these tools is relatively low.
• Digital. These are equipped with a display which shows the dimensions of a component. They can be used both for absolute and comparative measurements. The results shown are highly accurate.

These are alstools for specific purposes:

• Deep throat micrometers. Allow measuring the thickness of a metal sheet.
• V-anvil micrometers. For measuring the diameter of milling cutters and other multipoint-cutting tools.
• Wire micrometers. They are necessary if one needs tdetermine the diameter of small rounded components, for example, bearing balls.
• Groove micrometers. These are used for measuring both the width of grooves and the distance between them.
• Tube micrometers. They measure the thickness of tube walls.

Besides, there are instruments with reduced or caliper jaw type measuring faces. They are suitable for working with components which are hard treach.

Micrometers: maintenance tips

1. Follow the manufacturer’s recommendations concerning the usage of the tool and its storage conditions.
2. Dnot use the instruments for working with hot elements as well as with the parts covered with metal dust or oxide scale.
3. Before you start, clean the surface of the components tbe measured.
4. Turn the thimble slowly and carefully. This will prevent the premature failure of the tool.

Professional help from Buycarparts.co.uk

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