Interesting Joint
 

On Wed, 26 May 2004 01:17:53 -0700, charlie b
wrote:

a very interesting joint today. Chinese/Japanese in origin, it is
used to join wood end to end,

In English timber-framing practice, this is an edge-halved scarf
joint.

It's typically regarded as mid-14th to mid-16th century work. Before
this a splayed scarf joint was used, afterwards a face-halved scarf
joint. All three are widely seen and are a valuable means of dating
old timber-framed buildings.

For the splayed scarf, (the mating faces are sloped, and in two
parallel planes. It's locked by a rectangular peg (or pair of wedges)
knocked into the gap between the two steps in the sloped faces.
They're hard to lay out. and take a while to cut because it's a
sloped-grain surface. After the Black Death had killed 1/4 of the
population, there was need for a simpler joint that the surviving
carpenters could have cut by unskilled labourers.

The face-halved scarf is even simpler to cut. Imagine turning the
large flat surface by 1/4 turn, relative to those stopped mortices.
Now the whole thing can be marked on a single face and sawn out
without chiselling into a stopped corner. The face-halved joint is
much less strong (it's still strong, but only in one direction) but it
can be made by even less skilled carpenter's labourers.

A couple of weeks ago I was at Cressing Temple barns in Essex. These
are a pair of 13th century timber framed barns and show both styles of
halved scarf joint. Pretty long timbers too - some are over 40' in one
piece.

--
Smert' spamionam

Interesting Joint
 

On Fri, 28 May 2004 01:19:41 +0100, Andy Dingley
stated wide-eyed, with arms akimbo:

The face-halved scarf is even simpler to cut. Imagine turning the
large flat surface by 1/4 turn, relative to those stopped mortices.
Now the whole thing can be marked on a single face and sawn out
without chiselling into a stopped corner. The face-halved joint is
much less strong (it's still strong, but only in one direction) but it
can be made by even less skilled carpenter's labourers.

A couple of weeks ago I was at Cressing Temple barns in Essex. These
are a pair of 13th century timber framed barns and show both styles of
halved scarf joint. Pretty long timbers too - some are over 40' in one
piece.

http://www.e-gfl.org/e-gfl/activitie...rs/default.htm
Still looking for a picture of the beams/construction, but the
exterior is impressive, too.


http://www.zenzero.com/mystery/cone.html

Another turning mystery. Can you answer the question he poses?
g


-
Yea, though I walk through the valley of Minwax, I shall stain no Cherry.
http://diversify.com

Interesting Joint
 

sigh Your post got me Googling for images of TF joints. Very
inspiring. I really want to timberframe one day. Maybe my next shop...

Thanks for the post,
-Mike

Andy Dingley wrote in message . ..
On Wed, 26 May 2004 01:17:53 -0700, charlie b
wrote:

a very interesting joint today. Chinese/Japanese in origin, it is
used to join wood end to end,

In English timber-framing practice, this is an edge-halved scarf
joint.

It's typically regarded as mid-14th to mid-16th century work. Before
this a splayed scarf joint was used, afterwards a face-halved scarf
joint. All three are widely seen and are a valuable means of dating
old timber-framed buildings.

For the splayed scarf, (the mating faces are sloped, and in two
parallel planes. It's locked by a rectangular peg (or pair of wedges)
knocked into the gap between the two steps in the sloped faces.
They're hard to lay out. and take a while to cut because it's a
sloped-grain surface. After the Black Death had killed 1/4 of the
population, there was need for a simpler joint that the surviving
carpenters could have cut by unskilled labourers.

The face-halved scarf is even simpler to cut. Imagine turning the
large flat surface by 1/4 turn, relative to those stopped mortices.
Now the whole thing can be marked on a single face and sawn out
without chiselling into a stopped corner. The face-halved joint is
much less strong (it's still strong, but only in one direction) but it
can be made by even less skilled carpenter's labourers.

A couple of weeks ago I was at Cressing Temple barns in Essex. These
are a pair of 13th century timber framed barns and show both styles of
halved scarf joint. Pretty long timbers too - some are over 40' in one
piece.