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Pulley Wheel Set: Ten Grooved Hardwood Pulleys Turned in Graded Sizes
A pulley is a wheel on a shaft with a groove round its rim that keeps the cord or belt in place (Wikipedia, Pulley). This set is ten hardwood pulleys from 30 to 75 mm, each bored for an 8 mm dowel shaft, so any two can be keyed to one shaft for experiments such as the differential pulley. Sizes and method are ours.
The picture: our drawing.
中级
1 day
说明
1
1
Cut the blanks
Cut the blanks
Cut ten round blanks from 18 mm hardwood with hole saws, from 30 to 75 mm in steps of 5 mm, each a few millimetres oversize.
此步骤所需材料：
硬木板1 个所需工具：
开孔器套装
台钻
安全眼镜2
2
Bore the shaft hole
Bore the shaft hole
Bore each centre 8 mm, square to the face, for the dowel shaft.
所需工具：
台钻
钻头套装
6 英寸数显卡尺3
3
Turn rim and groove
Turn rim and groove
Mount each blank on the lathe, turn the rim true to its size, and cut a groove round it between two flanges, about as wide as the cord. Measure each finished diameter at the bottom of the groove and write it on the face.
所需工具：
木工车床
车床花盘
车削圆凿
车床切断刀6 英寸数显卡尺安全眼镜4
4
Key hole and finish
Key hole and finish
Drill a small hole through the hub of each pulley beside the shaft hole for a pin, so two pulleys can be pinned together to turn as one. Sand and oil them.
此步骤所需材料：
亚麻籽油20 毫升所需工具：
台钻钻头套装
砂纸套装
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