Friday, August 7, 2009

First Light XXVII

This is the 27th installment on this series on the construction of a post-mount Japanese garden lantern. I suspected the series might go to 30 parts, but now I'm thinking 40 or even 50 parts is more likely. Sometimes I wonder if I'm providing too much detail of the myriad steps and wonder if readers might wish to see the piece described in fewer photos.

As it is I'm omitting about 20% of the photos I take for the benefit of brevity. This is getting to be a fairly long build thread, and I fear that some readers who might have interest in other carpentry matters might be losing interest or are swamped by too much information. That's a concern these days, given that we live in a sea of information, and there is a real danger of inundation.

Right-o then, on with the build...

I was in the process of showing the initial fit of the upper ridgepole when I left off last time - here it is a little further down:


I seated it a little further, could see that it was looking okay, needing a few minor fiddles, and thus decided I could trim the ends of the ridge to their slope lines:


After these cuts were taken, I used the jury-rigged shooting board and plane to clean the end grain cuts up.

Following that step, I next needed to trim a ledge at the inside of the cog joint so as to allow the upper ridge to slide down a little lower over the barge boards and thus conceal the double-dovetail joint completely:


Here's how that finished out:


Another fitting of the upper ridge:


You can still see that the ridge needs to drop a little bit, as the lower arrises of the ridge are intended to meet the lower outer corners of the barge board tops.

A view from the side, showing the junction of the top end of a barge board and the housed dovetail mortise on the upper ridge:


Still a slight gap visible there, but not to worry as it still needs to drop about 1/16" (1 mm). The tricky thing is that the upper ridge engages with the slope on each side of the the barge board, 2 slopes per board for 8 locations altogether, plus the engagement of the lower surface of the ridge with the upper surface of the roofing boards along their length (10 surfaces total) plus the interior of the double dovetail joints (14 surfaces total), plus the meeting points at the front of the barge boards. So, one must proceed cautiously.

Fitting takes a certain kind of mindset to come out well, and if I feel my mind wants to be elsewhere at such a time, I move on to other tasks that are more straightforward, like processing the backing cuts atop the ridge, which I did with my 54mm plane:


The completed backing cuts:



And here's a perspective on the roof assembly at this point in the process:


I was pleasantly surprised at how much rigidity the upper ridge adds to the roof - it really locks up the the barge board miter joints.

And just for fun, a view looking up:


The roof may be looking more or less complete, but there is still heaps of work to do on it yet:

- fitting of the intermediate locking ribs, three per side (these will be challenging)
- fitting of the 'wall' panels to block off the section above the ceiling board
- fabrication of the 4 locking keys/wedges to hold the two ridgepoles together
-fitting of the lower sliding draw bars, and their lock wedges, to fix the barge boards to the lower end of the lower roof boards
- fitting of the hi-uchi locking pins for the upper wall plate

I'm sure other things will come to mind as I move along. once the roof is done, I will start on the lantern housing grille panels, which should be entertaining to make.

Oh yes, and there's one more thing to deal with in regards to the roof: the construction of the two hanging fish, and their attachment to the roof. That will be the subject of the next post or two.

See you next time - I've got some work to do.

6 comments:

  1. I like the detailed entries with lots of photos. My vote is to keep on the same path.

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  2. What I really want to know is how your going to get inside to change the light bulb ;^)
    Ahem, carry on...

    C on the Big

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  3. Hello C (on the Big),

    now, it would be sorta humorous if I built it all the way out to completion and then at the end realized I had made no accommodation for accessing the light bulb! Sorta funny, but i know if that in fact happened, there would be some moments of desperation and a few expletives to be sure.

    For once though, I thought ahead about this matter (at the same point I was dealing with the post design to allow a wire chase), and have a solution already worked out, again involving only joinery. That will be one of the last things I'll tackle.

    Looks like 'more' seems to be what people are interested in as far as this thread goes, so I'll keep plowing ahead.

    ~Chris

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  4. Yes Chris, the close-up snaps give away lots of info that is obvious to the experienced, but a goldmine to us hungry learners, ..to use oil on the endgrain cuts, how you bring things to dimention in stages, Knife cuts and pencil marks, even how to use the saws. Realy appreciated!

    I am wondering about the picture of the singer framed on your kitchen wall.

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  5. Gordon,

    that painting is of Ella Fitzgerald. Glad you're getting a lot out of these posts!

    ~Chris

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