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2018-02-28T09:11:23Z

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	=====Description=====		=====Description=====

	A '''Knocked Up Joint''' or [https://en.wikipedia.org/wiki/Hemming_and_seaming '''Double Seam'''] is commonly used to fix an end to a cannister or food can. The canning industry would normally use a '''Seaming Machine''' ''(see [http://adashofscience.com/~~2014~~/02/~~11/can-seam-inspection~~/ '''A Dash of Science'''] for further detail)'' but they were traditionally hand made by [https://en.wikipedia.org/wiki/Tinsmith '''Tinsmiths''']. If made properly a '''Knocked Up Joint''' should be water-tight without being soldered but, of course, they can be soldered as well if required.		A '''Knocked Up Joint''' or [https://en.wikipedia.org/wiki/Hemming_and_seaming '''Double Seam'''] is commonly used to fix an end to a cannister or food can. The canning industry would normally use a '''Seaming Machine''' ''(see [http://adashofscience.com/category/science/engineering/ '''A Dash of Science'''] for further detail)'' but they were traditionally hand made by [https://en.wikipedia.org/wiki/Tinsmith '''Tinsmiths''']. If made properly a '''Knocked Up Joint''' should be water-tight without being soldered but, of course, they can be soldered as well if required.

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=====Description=====

A '''Knocked Up Joint''' or [https://en.wikipedia.org/wiki/Hemming_and_seaming '''Double Seam'''] is commonly used to fix an end to a cannister or food can. The canning industry would normally use a '''Seaming Machine''' ''(see [http://adashofscience.com/2014/02/11/can-seam-inspection/ '''A Dash of Science'''] for further detail)'' but they were traditionally hand made by [https://en.wikipedia.org/wiki/Tinsmith '''Tinsmiths''']. If made properly a '''Knocked Up Joint''' should be water-tight without being soldered but, of course, they can be soldered as well if required.

=====Making the Joint=====

[[File:TinsmithMakingStandingSeam.png|right|400px]]
* To make the base, mark out a circle with its radius equal to the cylinder radius plus twice the width of the [https://en.wikipedia.org/wiki/Hemming_and_seaming '''Seam'''].
* Form a rim round its outside with a depth equal to the width of the [https://en.wikipedia.org/wiki/Hemming_and_seaming '''Seam'''] ''(do this by working around the circumference little by little with '''[[Pliers and Cutters|Flat Nosed Pliers]]''' and truing up with a '''[[Boxwood Mallet|Boxwood]]''' or '''[[Rawhide Mallet]]''' on a '''[[Mandrel Stake]]''')''.
* The length of the cannister needs to be extended by the width of the [https://en.wikipedia.org/wiki/Hemming_and_seaming '''Seam'''] so that a flange equal to this can be formed around one end ''(as before, do this by working around the end little by little with '''[[Pliers and Cutters|Flat Nosed Pliers]]''' and truing up with a '''[[Boxwood Mallet|Boxwood]]''' or '''[[Rawhide Mallet]]''' on a '''[[Bench Block]]''', '''[[Tinman's Anvil]]''' or similar flat surface)''.

[[File:TinsmithMakingKnockedUpJoint.png|right|400px]]
* Place the flanged cannister inside the rim of the base and flatten the rim down on to it using a '''[[Boxwood Mallet|Boxwood]]''' or '''[[Rawhide Mallet]]''' down on to a '''[[Bench Block]]''' or similar surface.
* The joint formed at this stage is known as a '''Paned Down Seam'''
* To complete the '''Knocked Up Joint''' or '''Double Seam''', the cannister is held on to a '''[[Mandrel Stake]]''' and folded over again as shown.
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<span style="color: green">'''Note:'''
Use a '''[[:Category:Mallets|Mallet]]''' and not a '''[[:Category:Hammers|Hammer]]''' to avoid stretching the metal as it is struck ''(this would cause the edge to distort)''.
</span>
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{{Sheet Metalwork Buyers Guide}}

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

Knocked Up Joint - Revision history

DT Online at 09:11, 28 February 2018

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