It includes driving shaft, helical spring, key way on the driving shaft, block, front stop unit, back stop unit, etc.

传动 轴、螺旋弹簧、传动轴上的键槽、滑块、前限位和后限位等部分。

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The spokes are inserted through the center of a sliding block and the sliding block slides along the spokes radially. The secondary shaft and the sliding block are connected by a chain bar.

滑块由轮辐从中间穿入并沿轮辐径向滑动，副轴和滑块之间用链杆连接。

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Usage: suitable for precise lathing of rotor outer circle and commutator that with big shaft diameter and V block can not be used.

用途：适用于V型块无法使用的较大轴径的转子外圆或换向器的精车。

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If you're caught you will get sent to D-Block solitary, a tiny cube where days are marked by a light shaft travelling across the wall - or you might be interrogated using techniques only alluded to in the otherwise thorough Alcatraz audio tour, with first-hand accounts by prison guards and prisoners of the Rock.

BBC: A tour of San Francisco��s Alcatraz