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Grooved Seam Joint

From DT Online

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Description

Grooved Seam are a type of self-locking joint used commonly in the fabrication of cylindrical and conical objects. The Seam can be on the outside or on the inside. The extra material allowance for a Grooved Seam is 3 times the width (W) of the Seam, one half of this amount being added to each edge (Note: up to 4 times the material thickness may also need to be added for thicker sheet materials)..


Making a Grooved Seam
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  • When locking a Grooved Seam on the outside of a cylinder or conical object, the workpiece can be supported on a Mandrel Stake, Triblet, Anvil or Funnel Stake.
  • Grooved Seams on the inside of cylinders and cones can be supported by a rail extending out of the side of the Vice with a suitable groove cut along its top surface (alternatively, a temporary rail can be created by clamping together three steel strips and setting the middle one down a little to form the centre groove).


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Cap Strip Seam

A Cap Strip (aka Drive Slip) can be used to draw together two halves of a joint to make a Double Groove Joint. It is a method often used to assemble air-conditioning and heating ducts.


A similar strip can be used to create a Locked Corner Seam which is useful for the assembly of rectangular shapes.


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Standing Seam

A Standing Seam is similar to a Grooved Seam which has not been completely folded over. They are used for joining metals where extra stiffness is needed, such as roof coverings and ventilation ducting.


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