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Worm and Worm Wheel: a Steel Screw and a Hobbed Bronze Wheel
A worm is a screw that drives a toothed wheel at right angles; with a single-start worm each turn moves the wheel one tooth, so a 30-tooth wheel gives 30:1. Cut the worm on a screw-cutting lathe, make a hob that is a copy of it with cutting edges, gash the bronze wheel on the dividing head, then run the hob through it to finish the teeth.
The picture: a worm shaft with its bearings and a hobbed bronze worm wheel from a gearbox.
高级
Three to four days
说明
1
1
Cut the worm
Cut the worm
Turn the steel bar to the worm's diameter and set the lathe's change gears to the axial pitch (π × module). Cut the single-start thread with a tool ground to the tooth form, checking it with the gauge.
此步骤所需材料：
低碳钢圆棒1 个所需工具：
金属车床
高速钢木车刀套装
螺纹规
游标卡尺
切削油2
2
Make the hob
Make the hob
Cut the same thread a little oversize on tool steel, file four or more lengthwise flutes across it to make cutting edges, back off behind each edge, then harden and temper it.
此步骤所需材料：
工具钢八角钢1 个所需工具：
金属车床
金属锉
铁匠炉
淬火水桶
安全眼镜3
3
Cast and turn the wheel blank
Cast and turn the wheel blank
Melt bronze in a crucible, cast a round blank, and turn it on a mandrel to the wheel's diameter with a hollow rim to wrap the worm.
此步骤所需材料：
青铜锭1 公斤
木炭1 as required所需工具：
铁匠炉
耐火黏土坩埚
坩埚钳
锭模金属车床
芯棒
电焊手套4
4
Gash the teeth
Gash the teeth
Mount the blank on the dividing head with the cutter path set at the worm's lead angle and cut a slot for every tooth, nearly to depth.
所需工具：
铣床
分度头切削油5
5
Hob to shape
Hob to shape
Run the hob in mesh with the gashed blank, free to turn, feeding it in gradually to full depth: it drives the blank round and generates the true tooth form.
所需工具：
铣床
蜗轮滚刀切削油6
6
Sizes for a 30:1 set
Sizes for a 30:1 set
正在加载 Jupyter 笔记本…
7
7
Limits
Limits
Worm drive principles, gashing and hobbing are as Wikipedia describes them; the module, tooth count and making the hob from the worm's own thread are ours. A single-start set like this is usually self-locking, which depends on lead angle and friction.
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