Marking and measuring a workpiece accurately is very important whether in a mechanical workshop or the construction industry. Here is a selection of the tools that are used for marking and measuring.
Marking and Layout Tools
When working on a workpiece it is often necessary to make marks to indicate where you should drill holes or cut.
A scriber is made from tool steel. It has a sharp point which enables it to scratch lines on metal. Marking fluid is often used to make scribed lines stand out clearly.
There are different types of punches. A centre punch is used to mark the centre of a hole before drilling.
Try squares are made from tool steel, and they are particularly useful when we are to find out if surfaces are right-angled to each other or not.
Dividers are made from tool steel, but in the top hoop spring steel is used. They are used for transferring measurements from rules to a workpiece and for marking out arcs and circles.
A spirit level can be made out of metal or plastic. Embedded in it is a small container of ethanol with a bubble in it. When the bubble is in a marked position the surface will be level, either horizontal or vertical.
Engineers' Rule and Folding Rule
An engineers' rule is made of stainless or carbon steel and is used for measuring length. A folding rule is made of wood and is used by carpenters and others who work with wood.
This is used to measure the length of an object where the measurement does not have to be so accurate.
Vernier calipers give an accurate measurement of width and inside and outside diameters. They may also measure depth.
There are several types of micrometers. A micrometer is used to measure diameters and depth when higher accuracy is demanded. It can give a reading to the accuracy of 0.001 mm.
Thread Pitch Gauge
A thread pitch gauge is used to measure the threads on a screw. It has many thin blades each with a number which shows the distance between the threads.
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