| 摘要 |
Novel extended-scale indicators of various types are disclosed, primarily for milling machine lead-screws. The described indicators include a sprocket on the lead-screw shaft, usually two looped or continuous tapes cogged to the sprocket, and a protective enclosure having idlers that guide the tapes in a compact serpentine path. The lengths of the tapes are related so that one tape precesses in relation to the other in successive sprocket rotations, including extended-scale indication in opposite directions of operation, starting at a common zero. One modification provides direct English-to-metric conversion. Another indicator provides turn-by-turn error calibration of the lead screw. Three identical individually adjustable indicators in tandem, having their zeros offset from each other, provide direct readings for centerline drawing dimensions and for drawing dimensions modified to allow plus and minus cutter off-set. Other tandem indicators are described.
|
