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Slotted Machine Screws Turned from Round Bar
Small machine screws with a slotted cheese head are turned from round bar: the head is the bar's own diameter, the shank is turned down and threaded, and a slot is sawn across the head. The example is M4 to ISO 1207: head 7 mm across and 2.6 mm high, slot 1.2 mm wide and at least 1.1 mm deep.
中级
15 minutes per screw
说明
1
1
Turn the head diameter
Turn the head diameter
Chuck mild steel round bar and turn the end to 7 mm for a length of 20 mm more than the screw.
此步骤所需材料：
低碳钢圆棒0.2 米
切削油5 毫升所需工具：
金属车床
三爪车床卡盘
车床刀具套装（HSS）
6 英寸数显卡尺
安全眼镜2
2
Turn the shank
Turn the shank
Turn the shank a little under 4 mm, leaving 2.6 mm of head plus the parting width. Chamfer the end.
所需工具：
车床刀具套装（HSS）6 英寸数显卡尺3
3
Thread M4
Thread M4
With the lathe off, cut the M4 x 0.7 thread with the die and oil.
此步骤所需材料：
切削油2 毫升所需工具：
丝锥板牙套装
板牙架4
4
Part off
Part off
Part the screw off 2.6 mm behind the shank shoulder and round the head's edge with a file.
所需工具：
车床切断刀
锉刀套装5
5
Saw the slot
Saw the slot
Hold the screw in soft vise jaws and saw a slot straight across the head, 1.2 mm wide and at least 1.1 mm deep. Deburr it.
所需工具：
钢锯
台虎钳锉刀套装6 英寸数显卡尺6
6
Troubleshooting
Troubleshooting
Machine screw troubleshooting.
Flow
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