Trammel tool is used for laying out large circles.
Shrink rule is used for marking and measuring patterns and hot jobs handled by blacksmith.
V-block is used to hold round bars. It has a V-groove which is usually 90 Degree.
In lay out work it is necessary to scribe lines to indicate the dimensions of the workpiece to be filed or machined. The scriber is a tool used for this purpose. It is made of high carbon steel and is hardened. For drawing clear and sharp lines, the point should be ground and honed frequently for maintaining its sharpness. Generally the point angle of Scriber is 12 Degree to 15 Degree.
The point angle of centre punch is 90 Degree.