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)..
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.
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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