The measuring faces of the slip gauges are finished by ______.

Explanation:

Slip gauge

• Slip gauges or gauge blocks are used as standards for precision length measurement.
• These gauges are made in sets and consist of a number of hardened blocks made of high-grade steel with low thermal expansion.
• These slip gauges are available in various sets with different numbers.
• A particular size can be built up by wringing individual slip gauges together.
  Wringing is the act of joining the slip gauges together while building up to sizes. 
• Lapping is a precision finishing operation carried out using fine abrasive materials. This process improves geometrical accuracy, refines surface finish, and assists in achieving a high degree of dimensional accuracy.
• The faces of the slip gauges are finished by Lapping only.

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Drilling is the production of cylindrical holes of definite diameters in workpieces by using a multi-point cutting tool called a ‘drill’. It is the first operation done internally for any further operation.

Honing is a superfinishing process carried out using abrasive sticks for the removal of stock from metallic and non-metallic surfaces. This process produces a high surface finish, corrects the profiles of cylindrical surfaces, removes taper.

A reamer is a multi-point cutting tool used for enlarging by finishing previously drilled holes to accurate sizes.