"Grailing" is a cutting process which uses a single-point cutting tool to produce either "a series of fine concentric circles from the circumference to the centre of the work" or "a single fine spiral line, running from the circumference to the centre of the work" ( Clarke) It is thus a simple form of Engine Turning.
See ../ Ornamental Turning -> Literature -> Other 19th Century Writers in English -> Clarke, George Calvert. "Spiral Grailing." The Quarterly Journal of the Amateur Mechanical Society. Vol. 1, No. 5 (January, 1872): 150-152.
Not to be confused with the cutting of concentric circles in the imitation of spotting using multi-point cutting tools.
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