Datum first, lines second
A scriber is used to mark all lines on a metal surface, and its point must remain sharp to produce well-defined lines.
A divider is used to scribe circles or arcs and to mark a series of lengths such as hole centres, and it is made from tool steel or high-carbon steel.
1. What does marking out primarily achieve on a workpiece?
2. Which description best matches a datum in marking out?
3. How should a scriber point be maintained to produce clear lines on metal?
What is marking out in machining?
Scratching lines on a workpiece surface to indicate outlines or positions.
What is a datum in measurement?
A reference point, edge, or centre line for all dimensions.
How many datums are needed to position a point on a plane surface?
Two datums are required.
At what angle are two datums usually set to position a point?
They are usually at right angles to each other.
What is the purpose of a scriber on a metal surface?
To mark all lines on a metal surface.
Why must a scriber's point remain sharp?
To produce well-defined lines.
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