evil test piece...(que evil mad man laugh while rubbing hands)

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Project by jjempson posted 05-07-2011 02:00 PM 3437 views 14 times favorited 14 comments Add to Favorites Watch

once a year we put our students into a compatitoin and we give them test pieces to get them ready for the main event…
in the past its been a simple frame with a half lap here and a mortice there…but me being me i like to push the ability and see what they are capable of..
1st picture…main corner is the mortice and tenon as seen in 2nd..3rd picture..
the two up rights are just a simple but joints screwed together but at the top you can see on one side its a strait forward cut out section…on the other side its the same basis but just lapped..
the last sections are as follows….the timber is double rebated and is dovetailed together with a mitired section…the last past is the fixing pin which locks them together…again mitred….this section sit on top of the two uprights with the final third piece resting back onto the mortice and tenon…
not many have tried …. including the other teachers

-- jjempson

14 comments so far

View CharlieM1958's profile


16292 posts in 5272 days

#1 posted 05-07-2011 02:44 PM

Very impressive! (Now where’s my pocket hole jig?) :-)

-- Charlie M. "Woodworking - patience = firewood"

View jerrells's profile


918 posts in 3938 days

#2 posted 05-07-2011 03:28 PM

DUDE – that is one serious joint. Anyone (in my opinion) Making that work is a woodworker. WOW!

-- Just learning the craft my Lord and Savior Jesus Christ practiced.

View Occie gilliam's profile

Occie gilliam

505 posts in 4350 days

#3 posted 05-07-2011 04:01 PM

yes wow feel the same as jerrells.

-- OC down in Costa Rica. come down and see me some time. I'll keep the light on for you [email protected]

View Jamie Speirs's profile

Jamie Speirs

4168 posts in 3910 days

#4 posted 05-07-2011 04:09 PM

Cruel. LoL

Do you have the drawing?


-- Who is the happiest of men? He who values the merits of others, and in their pleasure takes joy, even as though 'twere his own. --Johann Wolfgang von Goethe

View Ampeater's profile


442 posts in 4801 days

#5 posted 05-07-2011 04:25 PM

I really like the joints, but I think that I would have to draw it up in “Sketchup” before I would understand it enough to start cutting wood. LOL

-- "A goal without a plan is a wish."

View woodzy's profile


418 posts in 3733 days

#6 posted 05-07-2011 05:15 PM

Yikes !! That looks like a lot of fun.

it always amazes me that with all the joints that i see on this site someone can come up with an original one .

-- Anthony

View Woodstock's profile (online now)


264 posts in 4342 days

#7 posted 05-07-2011 06:57 PM

That’s very impressive.

So I have to ask. Are the students allowed to use power tools, hand tools, or both?

-- I'm not old. Just "well seasoned".

View Bluepine38's profile


3390 posts in 4139 days

#8 posted 05-07-2011 07:52 PM

Okay, you said not many have tried, but you neglected to say if any had completed the task, and if they
were students or teachers, if any completed it successfully. Did your, or can you provide drawings, or did
the woodworkers have to make their own measurements and drawings? Not trying to be obnoxious, but
I would like to try these joints, and the pictures are not real clear to me. Thank you for the challenge.

-- As ever, Gus-the 80 yr young apprentice carpenter

View jjempson's profile


200 posts in 4042 days

#9 posted 05-07-2011 08:18 PM

Jamie Speirs im affraid i have no drawing..this has evolved from my mind…the tripple mitre joint is a old school joint used in wooden display cabinets…due to the way the rebates allow for glass to be fitted on each side…museum’s used them alot…for stuffed animals…found a old picture and went from their…measurments were made as i went along with the project..

N6DSW hand tools all the way…the only kind thing i do for the little darlings are that i run the rebates for them…other than that its all hand skills…at college i only allow them the use of power tools when the job can be completed by hand…they complain but i say… if the power tool fails you need to be able to complete the task to a high stsndard..

-- jjempson

View jjempson's profile


200 posts in 4042 days

#10 posted 05-07-2011 09:01 PM

as yet no fellow teachers have tried it…
the students had the piece in front of them to look at and measure..
three students have tried it but each has declined to finish..but full respect to them for trying..
i will try to sort out a detail drawing…and some how post it ..
but from memory here are some measurements
Timber size…60×60 mm (triple mitre section) ... 60×30 mm
timber length…300 mm
rebates…50×15 mm on two faces
dove tail angle…1:6 (softwood ratio)
mortice and tenon…1/3 ration…eg..10mm thick tenon
you will need a fine saw and a selection of small chisels…1.5mm is the smallest you will need.

you are in no way obnowious…its nice to find some ones whos for a challange..

.....hope this helps

-- jjempson

View littlecope's profile


3119 posts in 4556 days

#11 posted 05-08-2011 02:35 AM

That looks like fun!!
Nice joint my Friend!!

-- Mike in Concord, NH---Unpleasant tasks are simply worthy challenges to improve skills.

View PflugervilleSteve's profile


99 posts in 4096 days

#12 posted 05-09-2011 07:51 AM

Never one to let a challenge pass by… See sketchup files. Shared to Google’s 3D warehouse.

Test Piece 1

Test Piece 2

Notes: Since I was working from pictures and live in the US, I started with stock that could be easily made from a 2×4.

Test Piece 1 is based off 1 3/4 thick 2 1/2” wide and 18” long stock.

Test Piece 2 is based off 1 3/4” square stock. I modeled pieces 18” long, but length is fairly irrelevant for “test pieces”.

This was a fun exercise. Having modeled it, I can also tell there’s a “right order” to cut all the pieces. If you get things out of order, marking them precisely becomes tricky. The mortise that locks the dovetail in place seems a prime example. Cutting the mortise after the dovetail is cut becomes much trickier due to the angle of the dovetail.

I didn’t bother to explicitly mark dimensions, but each piece is a component and can be moved around without messing up other pieces. Hope this clarifies the construction of these joints!

Might have to try to make these now.

View jjempson's profile


200 posts in 4042 days

#13 posted 05-11-2011 08:25 PM


wow…the drawings look fantastic…all i can say is a big thank you…
if your self or anyone does have a go please post means alot to me for other poeple to try this…

-- jjempson

View Lars Öhlin's profile

Lars Öhlin

83 posts in 4411 days

#14 posted 09-07-2011 11:24 AM

impressive! true craftsmanship!

-- Lars Öhlin [Sweden - Helsingborg - Domsten]

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