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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.
Intermediate
15 minutes per screw
Instructions
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.
Materials for this step:
Mild Steel Round Bar0.2 meter
Cutting Oil5 mlTools needed:
Metal Lathe
Lathe Chuck 3-Jaw
Lathe Tool Set (HSS)
Digital Caliper 6-Inch
Safety Glasses2
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.
Tools needed:
Lathe Tool Set (HSS)Digital Caliper 6-Inch3
3
Thread M4
Thread M4
With the lathe off, cut the M4 x 0.7 thread with the die and oil.
Materials for this step:
Cutting Oil2 mlTools needed:
Tap and Die Set
Die Stock4
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.
Tools needed:
Parting Tool
File Set5
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.
Tools needed:
Hacksaw
Bench ViseFile SetDigital Caliper 6-Inch6
6
Troubleshooting
Troubleshooting
Machine screw troubleshooting.
Flow
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Materials
2- 0.2 meterPlaceholder
- 7 mlPlaceholder
Tools Required
11- Placeholder
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