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Grindstone: Sandstone Wheel on a Cranked Axle with a Treadle
A grindstone is a sandstone wheel spun on its axle to sharpen metal tools, used wet. Medieval ones were turned by a crank; by about 1480 a treadle was added so one person could pedal and grind. Shape the stone, wedge it on an iron axle with a crank, and mount it over a water trough in a wooden frame with a treadle.
The picture: a treadle grindstone on an iron stand, from Cassell's Carpentry.
高级
Several days
说明
1
1
Shape the stone
Shape the stone
Scribe a circle on an even-grained sandstone slab, about 50 cm across and 7 cm thick (our size). Peck and chisel it round, then cut a square hole in the centre.
此步骤所需材料：
砂岩板1 个所需工具：
两脚规
石锤（打制石器）
石雕凿子套装
石匠木槌
安全眼镜
防尘口罩2
2
Forge the axle and crank
Forge the axle and crank
Forge a square-sectioned axle to pass through the hole, round at both ends for the bearings, and bend a crank at one end with a hole for the treadle rod.
此步骤所需材料：
锻铁条2 个
木炭4 as required所需工具：
铁匠炉
铁砧
横向楔头锤
铁匠钳3
3
Wedge and true the stone
Wedge and true the stone
Centre the stone on the axle and drive hardwood wedges round the square part from both sides until it runs without wobble. Turn it and dress the rim true against a fixed iron.
此步骤所需材料：
硬木条1 个所需工具：
石匠木槌石雕凿子套装4
4
Frame, trough and treadle
Frame, trough and treadle
Build an oak frame with notched bearings for the axle, a plank trough below the stone to hold water, and a treadle hinged at the back joined to the crank by a rod.
此步骤所需材料：
硬木厚板3 个
铁钉30 个所需工具：
手锯
榫眼凿
手摇钻横向楔头锤5
5
Surface speed
Surface speed
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