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American Short Taper with Cam-lock Fitting Type D1 A replacement for the original American long-nose taper and widely used on many different sizes of lathe. The different sizes are referred to as D1-3", D1-4", D1-5", etc. although some publications and parts lists have the figures are reversed as in 3"-D1 or simply list them, as in the cart below, as 3" (3-inch), 4" (4-inch) etc. The spindle nose is provided with a short tapered flange of the same dimensions as the American A-1 Type but has in its face either 3 or 6 holes (for light and heavy-duty use respectively) into which the mounting studs on the back of a chuck or backplate can fit. Each stud is cut away in a semi-circle half-way along its length and an eccentric cross pin, turned by a standard chuck key, causes these to be drawn inwards until the pin goes over-centre and locks. The pins, being screwed into the back of the chuck, can be turned until the locking action is positive.
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