Mandrel

A mandrel, mandril, or arbor is a tapered tool against which material can be forged, pressed, stretched or shaped (e.g., a ring mandrel - also called a triblet[1] - used by jewellers to increase the diameter of a wedding ring), or a flanged or tapered or threaded bar that grips a workpiece to be machined in a lathe.

In addition to lathes, mandrels, more usually referred to as “arbours” are used to hold buffing wheels, circular saws, and sanding discs.

The mandrel allows the exhaust pipes to be bent into smooth curves without undesirable creasing, kinking, or collapse.

When shaping a ring or bangle with a triblet, it is typical to bend and solder the metal into a rough loop, then place it over the thinner end of the mandrel.

Once done, the next step is to strike the work in a downward motion with a hammer or other tool to push it towards the wider end.

A triblet can also be used to make a ring slightly bigger by gently tapping it in order to force it down the cone - thus stretching the metal.

During the manufacturing process, resin-impregnated filaments are wound around a mandrel to create a composite material structure or part.

In the production of steel core used for flexible drives, the center wire upon which the subsequent layers are wound is referred to as a Mandrel.

Metal machining utilizing the spinning process has been recorded as far back as ancient Egyptian times.

This method securely clamps the raw material and allows for accurate machining into the desired final form.

around 1700, and instantiated the design of a lathe mandrel able to slide axially in its bearings under the control of the operator, so that components having short lengths of thread could be produced, such as screws.