Mitre Joint: Difference between revisions
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[[File:MitreJoint.png|150px|right]] | [[File:MitreJoint.png|150px|right]] | ||
A [https://en.wikipedia.org/wiki/Miter_joint '''Mitre Joint'''] is created by cutting the joining pieces at 45 deg. They are essentially a '''[[Butt Joint]]''' and therefore quite weak but can be strengthened by reinforcement with '''Keys''' ''(i.e. thin pieces of veneer or similar set into sawn grooves)''. | __TOC__ | ||
'''Keys''' may be made from the same timber or a contrasting timber ''(or another material)'' can create a decorative effect. | |||
=====Description===== | |||
A [https://en.wikipedia.org/wiki/Miter_joint '''Mitre Joint'''] is created by cutting the joining pieces at 45 deg. They are essentially a '''[[Butt Joint]]''' and therefore quite weak but can be strengthened by reinforcement with '''[[Keys, Tongues and Slip Feathers|Keys]]''' ''(i.e. thin pieces of veneer or similar set into sawn grooves)''. | |||
'''[[Keys, Tongues and Slip Feathers|Keys]]''' may be made from the same timber or a contrasting timber ''(or another material)'' can create a decorative effect. | |||
[[File:KeyedMitres.png|750px|left]] | [[File:KeyedMitres.png|750px|left]] | ||
<div style="clear: both;"></div> | <div style="clear: both;"></div> | ||
=====Features and Applications===== | |||
[[File:MitreClosingRebateGroove.png|400px|right]] | [[File:MitreClosingRebateGroove.png|400px|right]] | ||
'''Mitre Joints''' are most commonly seen in picture frames but are useful in any situation where a [https://en.wikipedia.org/wiki/Rabbet '''Rebate'''], [https://en.wikipedia.org/wiki/Groove_%28joinery%29 '''Groove'''] or [https://en.wikipedia.org/wiki/Molding_%28decorative%29 '''Moulding'''] has to be returned around a corner. | '''Mitre Joints''' are most commonly seen in picture frames but are useful in any situation where a [https://en.wikipedia.org/wiki/Rabbet '''Rebate'''], [https://en.wikipedia.org/wiki/Groove_%28joinery%29 '''Groove'''] or [https://en.wikipedia.org/wiki/Molding_%28decorative%29 '''Moulding'''] has to be returned around a corner. | ||
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<span style="color: green">'''Note:''' | <span style="color: green">'''Note:''' | ||
Several wood joints may include a mitre on one of the faces, especially if there is a need to return mouldings of some kind ''(e.g. '''[[Bridle]]''' and '''[[Dovetail]]'''. | Several wood joints may include a mitre on one of the faces, especially if there is a need to return mouldings of some kind ''(e.g. '''[[Bridle Joint|Bridle]]''' and '''[[Dovetail Joint|Dovetail]]'''. | ||
</span> | </span> | ||
---- | ---- | ||
=====Construction===== | |||
[[File:CornerLapMarkingKnife.png|150px|right]] | |||
It is important to ensure that the ends of timber forming the joint are cut accurately and '''[[Squareness|Square]]'''. This can be achieved ''off the saw'' if care is taken using a '''[[Tenon Saw]]''' and a '''[[Mitre Box]]''' for example. Alternatively a '''[[Precision Mitre Saw]]''' or '''[[Radial Arm Saw]]''' will produce more predictable results. In all cases, scribing the joint lines with a '''[[Marking Knife]]''' will help to ensure clean edges at the joint face. | It is important to ensure that the ends of timber forming the joint are cut accurately and '''[[Squareness|Square]]'''. This can be achieved ''off the saw'' if care is taken using a '''[[Tenon Saw]]''' and a '''[[Mitre Box]]''' for example. Alternatively a '''[[Precision Mitre Saw]]''' or '''[[Radial Arm Saw]]''' will produce more predictable results. In all cases, scribing the joint lines with a '''[[Marking Knife]]''' will help to ensure clean edges at the joint face. | ||
'''Grooves''' for '''Loose Tongues''' can be cut using a '''[[Planes|Plough Plane]]''' and '''Slots''' for '''Keys''' cut by hand using a '''[[Tenon Saw]]''' and '''[[Coping Saw]]''' | [[File:CuttingKeySlots.png|550px|left]] | ||
'''Grooves''' for '''[[Keys, Tongues and Slip Feathers|Loose Tongues]]''' can be cut using a '''[[Planes|Plough Plane]]''' and '''Slots''' for '''[[Keys, Tongues and Slip Feathers|Keys]]''' cut by hand using a '''[[Tenon Saw]]''' and '''[[Coping Saw]]''' then '''''pared''''' to the line using '''[[Chisels]]'''. Alternatively a '''[[Router]]''' with suitable cutters can be used for both tasks. | |||
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<span style="color: green">'''Note:''' | |||
The work-piece is turned around in the '''[[Carpenters Vice|Vice]]''' to ensure the '''[[Tenon Saw]]''' cuts vertically and the waste is on the ''blind side'' of the saw. Note also the scrap wood behind the work-piece to avoid splitting out when '''[[Paring]]''' to the line with the chisel. | |||
</span> | |||
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<span style="color: red">'''Safety Point!''' | <span style="color: red">'''Safety Point!''' | ||
Students may only use a '''Router''' or '''Radial Arm Saw''' when they have been trained and assessed and the assessment shows that they are competent, and are under appropriate supervision | Students may only use a '''[[Router]]''' or '''[[Radial Arm Saw]]''' when they have been trained and assessed and the assessment shows that they are competent, and are under appropriate supervision by specifically trained staff. | ||
</span> | </span> | ||
---- | ---- | ||
{{Wood Joints Buyers Guide}} | |||
[[Category:Wood Joints]] | [[Category:Wood Joints]] | ||
Latest revision as of 11:58, 18 February 2017
Description
A Mitre Joint is created by cutting the joining pieces at 45 deg. They are essentially a Butt Joint and therefore quite weak but can be strengthened by reinforcement with Keys (i.e. thin pieces of veneer or similar set into sawn grooves). Keys may be made from the same timber or a contrasting timber (or another material) can create a decorative effect.
Features and Applications
Mitre Joints are most commonly seen in picture frames but are useful in any situation where a Rebate, Groove or Moulding has to be returned around a corner.
Note: Several wood joints may include a mitre on one of the faces, especially if there is a need to return mouldings of some kind (e.g. Bridle and Dovetail.
Construction
It is important to ensure that the ends of timber forming the joint are cut accurately and Square. This can be achieved off the saw if care is taken using a Tenon Saw and a Mitre Box for example. Alternatively a Precision Mitre Saw or Radial Arm Saw will produce more predictable results. In all cases, scribing the joint lines with a Marking Knife will help to ensure clean edges at the joint face.
Grooves for Loose Tongues can be cut using a Plough Plane and Slots for Keys cut by hand using a Tenon Saw and Coping Saw then pared to the line using Chisels. Alternatively a Router with suitable cutters can be used for both tasks.
Note: The work-piece is turned around in the Vice to ensure the Tenon Saw cuts vertically and the waste is on the blind side of the saw. Note also the scrap wood behind the work-piece to avoid splitting out when Paring to the line with the chisel.
Safety Point! Students may only use a Router or Radial Arm Saw when they have been trained and assessed and the assessment shows that they are competent, and are under appropriate supervision by specifically trained staff.
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