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Forged Lathe Cutting-Off (Parting) Tool
A cutting-off or parting tool cuts a narrow groove in work turning on a lathe, and so cuts it off. It is forged from 1/2 × 1-inch tool steel 7 inches long, with a thin blade about 1½ inches long set flush with one side of the bar. Because it cuts only at its very end, the blade is made thickest at the edge and tapers back, so its sides clear the groove. It is hardened like a cold chisel and tempered to light yellow.
Intermediate
1–2 hours
Instructions
1
1
Cut and mark
Cut and mark
Cut the stock to length and centre-punch it.
Materials for this step:
Flat Tool Steel Bar1 pieceTools needed:
Center Punch
Hot Chisel2
2
Draw out the blade
Draw out the blade
Mark with a 1/2-inch fuller and draw out the blade, fullered side down, with a hand hammer on the anvil's rounded edge or under a trip hammer.
Tools needed:
Blacksmith Forge
Fuller
Forge Hammer
Trip Hammer
Blacksmith Tongs3
3
Taper the sides
Taper the sides
Taper the sides of the blade so it is thickest at the cutting end, giving clearance in the groove.
Tools needed:
Forge Hammer
Anvil4
4
Trim
Trim
Cut off the end of the blade at an angle with a hot chisel.
Tools needed:
Hot Chisel5
5
Harden and temper
Harden and temper
Harden the blade the same way as a cold chisel; heat it back past the blade and cool only the blade, then polish and let the colours run until the tip is light yellow, and cool it.
Tools needed:
Blacksmith Forge
Quench Bucket
Emery ClothMaterials
1- 1 piecePlaceholder
Tools Required
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