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Broaching a Keyway: A Steel Pulley Turned, Bored and Keyed
A broach is a long cutter whose teeth get a little taller one after another, so one push through a hole cuts a finished shape. Broaching began in the 1850s for exactly this job: cutting the keyway in a pulley or gear so it can be locked to its shaft.
中级
Half a day
说明
1
1
Watch: what is broaching?
Watch: what is broaching?
Broaching types, the machine and the broach's teeth, in a short course preview.
2
2
Turn the pulley
Turn the pulley
Saw a slice of round bar, face both sides and turn the rim to size on the lathe.
此步骤所需材料：
低碳钢圆棒1 个所需工具：
钢锯
金属车床
切削油
游标卡尺3
3
Bore it for the shaft
Bore it for the shaft
Drill and bore the centre to fit the shaft, and break the sharp edges.
所需工具：
金属车床
镗杆游标卡尺
锉刀套装4
4
Set up the horn and broach
Set up the horn and broach
Slide the horn (the slotted bushing) into the bore and set the pulley flat on the arbor press table. Drop the keyway broach into the horn's slot, teeth facing the bore wall, small end first.
所需工具：
拉刀导套
键槽拉刀
台式压力机5
5
Push it through in one stroke
Push it through in one stroke
Oil the broach and press it straight through in one steady stroke. Each tooth cuts a little deeper than the last, so the keyway comes out finished.
所需工具：
台式压力机键槽拉刀切削油6
6
Clean and check
Clean and check
Take out the broach and horn, clear the chips and check the key slides in snugly.
所需工具：
游标卡尺锉刀套装此蓝图制作
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