CENTERLESS GRINDING METHOD AND CENTERLESS GRINDER

PROBLEM TO BE SOLVED: To provide a technique of centerless grinding automatically adjusting to an optimum grinding condition according to the diameter dimension of a workpiece. SOLUTION: A workpiece of appropriate diameter dimension is temporarily determined as a workpiece 5 with a standard diameter (this temporary standard can be optionally set) (A1). At the time of grinding a workpiece 7 with a larger diameter than the temporary standard diameter, a space between a blade 2 and an adjusting grinding wheel 3 is adjusted so as not to change center height dimension H' (A2). When the diameter dimension difference between both workpieces 5, 7 is within a certain degree (within the same diameter area), the adjustment is sufficient, but when the diameter difference is in a certain extent or more (out of the same diameter area), the cutting edge stroke mode of a grinding wheel 4 (or the adjusting grinding wheel 3) is adjusted to cope with the diameter difference.