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Hole Saws: Toothed Strip Rolled into a Cup
A hole saw is a steel cup with teeth on its rim, driven by an arbor that carries a pilot drill at the centre. One method starts from flat strip: the teeth are stamped and then ground along one edge, the strip is bent into a tube with the teeth at one end, the seam is welded and its bead ground off, the tube is heat-treated to harden the teeth, and a cap is fitted. Better saws are bi-metal: a carbon steel cup with high-speed steel teeth welded on.
Advanced
Factory process
Instructions
1
1
Stamp and grind the teeth
Stamp and grind the teeth
Cut strip to length, stamp out the teeth along one edge and grind them.
Materials for this step:
Carbon Steel Strip0.2 kgTools needed:
Punch Press
Bench Grinder2
2
Roll and weld
Roll and weld
Bend the strip into a tube with the teeth at one end, weld the seam and grind off the bead.
Tools needed:
Tube Seam WelderBench Grinder3
3
Harden
Harden
Heat-treat the tube to harden the teeth.
Tools needed:
Strip Hardening and Tempering Furnace4
4
Cap and arbor
Cap and arbor
Fit the cap; the saw is driven by an arbor carrying the pilot drill.
Materials for this step:
Hole Saw Arbor with Pilot Drill1 pieceMaterials
2- 0.2 kgPlaceholder
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Tools Required
4- Placeholder
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