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Spur Gears, 20 Teeth: Cut One Space at a Time on a Dividing Head
Without a hobbing machine, a spur gear is cut one tooth space at a time: a formed involute cutter on a milling machine, the blank turned by a dividing head between cuts. On a 40:1 head, a 20-tooth gear is two full turns of the crank per tooth. Eight involute cutters cover every gear from 12 teeth to a rack.
The picture: cutting a spur gear with the spiral (dividing) head, from "A Practical Treatise on Milling and Milling Machines".
高级
A day for a pair
说明
1
1
Turn the blanks
Turn the blanks
Saw two slices of round bar and turn each to the outside diameter the cutter's data gives for your module and 20 teeth. Bore the centre to fit the mandrel and face both sides.
此步骤所需材料：
低碳钢圆棒1 个所需工具：
钢锯
金属车床
高速钢木车刀套装
切削油
游标卡尺2
2
Set up the head
Set up the head
Press a blank onto the mandrel and mount it between the dividing head and its tailstock on the milling table. Fit the involute cutter for 20 teeth of that module and centre it over the blank.
所需工具：
铣床
分度头
芯棒
渐开线齿轮铣刀3
3
Cut, index, cut
Cut, index, cut
Set the depth from the cutter's data, cut the first space with oil, back off, give the crank two full turns, and cut the next. Repeat until all 20 spaces are cut and you are back at the first.
所需工具：
铣床分度头渐开线齿轮铣刀切削油
安全眼镜4
4
Second gear and deburr
Second gear and deburr
Cut the second blank the same way. Deburr the tooth edges and check that the pair mesh smoothly at their centre distance (the sum of the two pitch radii).
所需工具：
去毛刺刀游标卡尺5
5
Indexing 20 teeth
Indexing 20 teeth
正在加载 Jupyter 笔记本…
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