The 15" Internal Spindle for Dumore Series 57 interchangeable spindle tool post grinders is for internal grinding to 15" depth (18" for holes larger than the 1 3/4" spindle diameter), 1 5/8" diameter, with 3/8" bore diameter grinding wheels up to 2 1/2" wheel diameter, 3/8" wheel thickness.
Maximum recommended speed: 15,000 rpm
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