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


			[[File:TinsmithStandingSeamJoint.png\|200px\|right]]
			=====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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=====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 ''(<span style="color: green">'''Note:''' up to 4 times the material thickness may also need to be added for thicker sheet materials)''.</span>.

=====Making a Grooved Seam=====

[[File:TinsmithMakingGroovedSeam.png|600px|right]]
[[File:TinsmithMakingSeamedCylinderGrooving.png|300px|right]]
* Mark out half the width of the [https://en.wikipedia.org/wiki/Hemming_and_seaming '''Seam'''] on each end of the piece to be joined.
* Fold initially to an acute angle using '''[[Folding Bars]]''' and '''[[Hatchet Stake]]''' or '''[[Bench Folder]]'''.
* Use a '''[[Boxwood Mallet|Boxwood]]''' or '''[[Rawhide Mallet]]''' to beat it over a scrap piece of metal of the same thickness on a '''[[Bench Block]]''' or similar surface.
* Hook together to two shallow 'U'-shaped ends and lock them together using a '''[[Grooving Iron]]''' as shown.
* ''(the process is similar for an 'Inside Seam' with the exception that a '''[[Grooving Iron]]''' is held upside down in a '''[[Engineers Vice|Vice]]''' and the joint is set down into it using a '''[[Boxwood Mallet|Boxwood]]''' or '''[[Rawhide Mallet]]''')''.

* When locking a '''Grooved Seam''' on the outside of a cylinder or conical object, the workpiece can be supported on a '''[[Mandrel Stake]]''', '''[[Triblet]]''', '''[[Blacksmith's Anvil|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 '''[[Engineers Vice|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)''.

[[File:TinsmithCapStripLockedCornerSeamJoint.png|250px|right]]
=====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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{{Sheet Metalwork Buyers Guide}}

[[Category:Skills and Processes]]
[[Category:Sheet Metalwork]]

Grooved Seam Joint - Revision history

DT Online at 17:59, 4 June 2017

DT Online at 13:14, 30 May 2017

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