| 摘要 |
A rotary machine tool holder has therein intermediate its ends a plurality of balancing screws that are mounted in internally threaded blind bores that extend part way into the holder from equi-angularly spaced points about an outer peripheral surface formed on the holder intermediate its ends, and coaxially of an axial bore in the holder. The screws are adjustable along axes disposed substantially tangentially of the axial bore of the holder, and are prevented from projecting radially beyond the outer peripheral surface of the holder by a plurality of cap screws removably mounted in the holder to have the heads thereof restrict the extent to which the balancing screws can be adjusted toward the outer surface of the holder.
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