Can square parts be spun?

No. Spinning only makes round, symmetrical shapes.

Is spinning cheaper than pressing?

For small quantities, yes, because the mandrel costs far less than a press die. For thousands of parts, pressing becomes cheaper.

Does spinning thin the metal?

Yes, especially on the walls of deep shapes, so the starting thickness is chosen with that in mind.

Metal spinning job work: spun cones, domes, uses

Metal spinning forms round, hollow parts by pressing a spinning flat disc over a shaped block (a mandrel) on a lathe. A roller or tool pushes the metal step by step until it takes the mandrel's shape. It makes cones, domes, bells, reflectors, funnels and tank ends with low tooling cost, so it suits small and medium quantities that would not pay for a deep drawing die.

Quick facts

Shapes: Round only: cones, domes, cylinders, bells, hemispheres
Materials: Aluminium, mild steel, stainless, copper, brass
Typical thickness: About 0.5–6 mm (0.0197–0.236 inch)
Diameter: From small parts to over 1 m
Tooling: A mandrel (wood, aluminium or steel)
Usually priced: Per part plus a small tooling charge

Spinning or deep drawing?

	Metal spinning	Deep drawing
Tooling cost	Low	High
Quantity	Small to medium	Large
Shapes	Round only	Round and other shapes
Speed per part	Slower	Fast

Typical parts

Lamp shades and reflectors
Hoppers, funnels and cones
Dished tank ends
Kitchen and dairy vessels
Ducting and venturi parts

What to send

Drawing with inside or outside shape dimensions
Material and thickness
Quantity
Finish (as spun, polished, coated)

Need metal spinning done?

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Related job work

Machines

Materials

Questions

Can square parts be spun?: No. Spinning only makes round, symmetrical shapes.
Is spinning cheaper than pressing?: For small quantities, yes, because the mandrel costs far less than a press die. For thousands of parts, pressing becomes cheaper.
Does spinning thin the metal?: Yes, especially on the walls of deep shapes, so the starting thickness is chosen with that in mind.

The figures on this page are typical values for guidance, written by Diemeco from standard engineering practice. They are not a specification: confirm grades and properties with the relevant standard or the supplier's mill test certificate, and tolerances with your workshop. Last checked 23 October 2026.