17
Feb 19

Fettling

More shed time today, and I spent the first half of it fettling the middle shelf in the desk. Straightforward, if repetitive process – assemble, check what’s too tight and what’s too loose, cut or pare the shelf a little narrower with saw and chisel, reassemble, recheck, repeat until the dovetail joint that was horribly stressed by the shelf being too wide:

…is no longer stressed, but just snug:

And doublecheck all the other joints to be sure nothing else is opening up.

Okay, I’m happy with that.

I’m also happy because before assembling this, I marked out the back of the top of the sides to show which bits had to be cut off to give a straight line across the back (because the top goes up against the wall for support), and when I assembled it:

Nice straight line.

So, now time to get rid of all the straight lines! Out with the French curves and the compass.

And also did a bit of marking with pencil of various things to know what goes where when assembled. Then I broke it all down and spent some time with the bandsaw, various handsaws, chisels and my favorite spokeshave to shape the shelves.

Not done yet, but nearly there for the walnut desk, and a little behind that for the middle shelf. Once they’re done, it’ll be time for inlay and decorative stuff. I need to order some resin for that, and do some testing. And there’s be the light fitting and cable chasing and then finishing and then final assembly and that’ll be that.

Meanwhile, there’s another project I want to start on because I’ve been watching Ron Aylor’s latest bout of carving recently and I’ve been wanting to go do some. But that will require some oak to be prepped. I have some but…

Well, I’ll have to dig it out…

…with a JCB. Le sigh. Also, it’s a bit thick for the size of box I have in mind. Time for the DeWalt 734 to earn it’s pay…

I’m kindof shocked really. I pulled four boards (because why dig that much for just one?) and with the #05 got one face to sit flat on the bench. That took about 25 minutes in total.

Then I fed all four through the 734, dropping thickness by about 0.4-0.5mm on each pass, and alternating sides once the first uppermost side was flat. That took 20 minutes to give the boards above. That would normally have taken all of this week’s evenings with the scrub plane. That’s a massive boon, I think it’s obvious the 734 is going nowhere. I mean, it’s not my idea of a finish planing, it’s very rough milling but still. That’s damn useful.

Now, I want them a few mm thinner, but it was getting late and the 734’s noisy, so I’m leaving them to warp and cup overnight before doing the last few passes in the 734. And also, I think I need to (a) clean up and (b) sort out something about extraction…

Yikes.


16
Feb 19

Angled dovetails

Some more – increasingly rare – time in the shed over the last week or so, and I started cutting the top shelf for the desk.

While I had the desk assembled to this stage the last day, I scribed the top shelf angles with pencil and set the board aside. Then this week, after thinking about it a bit, I double-checked the angles of the sides of the walnut board – because it’s the core around which all this is built – and then I used the angles of the walnut board, and the width from the scribe marks (and yes, I double-checked that the sides were plumb to the desk before scribing), and used those two to cut the top shelf.

I didn’t cut them according to the scribe marks’ angles because there’s a little bit of twist in the sides (not much, maybe 4-5mm over the full length of the sides, and the sides are poplar, not oak) so the top shelf should be pulling them back to the walnut board’s angles, not locking in their twist.

And of course, because it’s an angled cut on the end of the board, the dovetails get interesting.

The angles that would work on a straight edge obviously do not work on an angled edge because the line of the grain is no longer at right angles to the end – if you just cut the dovetails with no change to the angles, you’d get all manner of issues with the look of the joint, and with its mechanical strength due to some horrible short grain issues. So, like with everything, there’s a complex way to do it where you do all sorts of maths to figure out what the angles should be, or, there’s a trick (actually, there are two tricks, but one involves spending a few hundred euro on a Bridge City Toolworks bevel and sod that for a lark).

The sane trick is that you keep the offcut from the board when you cut the angled edge, then you mark off the dovetails with a normal dovetail marker against the straight edge on the offcut and you put a bevel against the angled edge and set it to the angle you marked off on the straight edge.

You also don’t cut both sides to the same angle – one side (in my case) is a 1:6 slope and the other side is a 1:8 slope. It doesn’t look right otherwise because of the angles.

I marked off the spacings using the normal two-dividers approach though.

With the marking out done, the sawing is nothing fancy (you can’t use guides, you have to saw to the line by hand – but that’s not that hard so long as you take your time).

Some tidying up with chisels and that’s the board ready. Next, hold it in place on the top of the relevant side, misalign it, swear a lot, erase pencil marks and retry until you eventually manage to hold a two-foot-plus board at a perfect right angle to an edge that’s five feet up in the air while drawing around it with a pencil.
I mean, it’s doable, but you learn new swear words.

After getting the transfer of lines done, the rest is standard dovetail fare. Cut them, fettle a lot with chisels, swear at gaps, the usual dance. And then repeat for the other side.

At that point, I assembled the carcass and found that the left dovetail fitted fine, and the right dovetail was hanging in mid-air an inch clear of the right side of the desk. What the…

Turns out, the middle shelf was too wide by a few mm. Out with the #04 and I shaved down the width by 2mm on each side (not all at once, it was a pare-and-fit job) and eventually I could assemble the entire carcass.

That middle shelf is not done yet though; it’s still a few mm too wide at the back, while being about right at the front but the end result is that there’s a lot of stress on the right hand dovetail joint:

There’s a whole 2.4mm of a gap there at the bottom, purely because the shelf is spreading the sides (I assembled without the middle shelf – it went together perfect square and true). I have some more fettling to do there tomorrow. But that wasn’t the point of this assembly (or bringing it indoors for that matter), it was more to check sizes. That desk seems so low off the ground that there’s no way it’s right, right?

Nah, it’s grand, the client is happy.

It’s now all back in the shed with the middle shelf removed. Tomorrow I’ll work on fettling that middle shelf fit and when that’s good enough, I’ll take the desk all apart and begin work on inlays and decoration and shaping. The inlay won’t be entirely conservative – the client isn’t a huge fan of traditional marquetry because he can’t spell “traditional marquetry” yet, but an inlaid race track for cars would be cool, and an inlaid blue ocean on which to recreate the death of several hundred people in the freezing waters of the north atlantic would be a very desirable feature apparently. I don’t know, don’t ask.

I also want to cut a 7mmx13mm channel in the underside of the middle shelf – that’ll house an LED strip in an recessed aluminium channel with diffuser (ebay’s a great tool these days). That does mean I need to figure out a way to run a mains cable from that shelf to the ground, in a way that doesn’t lead to a seven-year-old finding a way to pull it out of the desk and strangle the cat with it. Anyone know of a neat way to chase a cable through a piece of wooden furniture over a distance of around five feet in total? No, cable clips are not okay, and just routing out a channel and epoxying the cable in seems somewhat unmaintainable…

Speaking of routing, for some of the resin and the LED channel, I thought I might go back to the beast and try that again, but this time with a better way to hang on to it.

For the rectangular channel for the LEDs, a chisel would be just as good really, but for irregular pools of freezing-cold-north-atlantic-ocean blue resin, the router does make life a little easier.

Speaking of, I need to experiment a little with the resin. I have some ideas…


18
Jun 17

Off the shelf…

So fathers day was coming up and dad’s just finished the first year of a law course so lots of desk time and books involved. And then I noticed this on accidental woodworker:

Well, a desktop shelf that’d fit in the corner and leave room to hide pens and such underneath should be about right, and I had a nice piece of sapele…

…yeah, no. Turns out sapele is a total pain to plane with a normal handplane because of interlocking grain. By the time I’d resawn it from 6/4 down to just under 3/4inch thick and then flattened the resulting planks I’m down to just a shade over a half-inch thick and that just doesn’t look right for a shelf. So I abandoned the sapele to future box-making duties, and ordered a toothed plane iron to deal with the remaining sapele in my store.

And a new lighter mallet for finer work (the lignum vitae mallet is great but was a bit heavy for working on things like half-blind dovetails).

And then I hauled out one of the last planks of walnut I had to hand, skimmed it and rough-cut it from 9×48 to 9×23 and 8×24, losing an inch of length to kerf and clipping off a rough end on the board and losing an inch of width to a bit of live edge on one half of the board. I also grabbed some oak I had and crosscut it in half, then laminated the two halves together to one 3×3 block; and then cut a diagonal line across the width of the board to give me the two feet – the thing you stand on, not the archaic unit of measurement – roughly 3×2 at the front and 3×1 at the back for a nice gentle slope so that the spines of the books are visible when sitting or standing at the desk.

Then on to the sides. I took the 8×24, cut that in half after I had it flattened and thicknessed down to about ¾”, marked off which corners I’d cut off for that sloped look and then marked out both for a stopped dado for the shelf (which would act as a sort-of-half-lap joint as the shelf would have two shallow rebates on either end to fit). I was planning on using the cut nails I got from Dictum a while back as a design feature so I didn’t make it a sliding dovetail, the nails would hold well enough.

I cut down the walls of the dado as much as I could with the saw and then cut out the waste and the rest of the dado with a chisel, and used a router plane to tidy it all up.

Didn’t turn out too shabbily.


Even got some nice grain alignment between the sapwood and the front of the uprights.

Next though, have to attach the feet to the uprights. Ralph used biscuits for his, but I don’t have a biscuit joiner (or room to use one or store one) so I just cut mortice and tenon joints, complicated slightly by the joint being sloped – the mortice is deeper at one end than the other and the tenon is trimmed as well to avoid chopping through the feet when making the mortice. This gives even more rake to the uprights – it’s not a huge amount, but it does give that slightly steeper angle without needing either the joint or the angle of the feet to take the full angle. It’s a little nicer and it means the spines of the books are at an angle that makes reading the titles easier if you’re sitting or standing at the desk (Dad’s desk is one of those electric standing/sitting desk things).

Not as hard to cut as the curved tenons in the cot a while back. And I did think of using my new morticing chisels but the one in the size I wanted to use has a handle that is literally falling off, and it weighs two pounds and looks like a railway spike. It’s more for deep morticing through a few inches of oak. For a blind mortice like this that’s barely an inch at the most, the firmer chisels are the better choice. Also, holdfasts. Best morticing workholding ever.

And with those fitted, time to sort the back rails, also from some oak I had.
They’re a bit thin, but that’s okay, this is for a desktop so “brick shithouse” isn’t really the design aesthetic I’m looking for here. I was thinking of doing mortice and wedged tenons here, but the walnut was a bit narrower than the sapele board I started with (so pushing the rails back means being able to hold wider books), and walnut’s far easier to carve, so I switched to the idea of using half-blind dovetails so the sides were kept fairly clean-looking. Those went very smoothly (it’s walnut, you’re basically cheating using it for dovetails), the only difficult part being the layout (because you basically need the whole thing assembled to get the final shoulder lines for the last two joints). But you’re only cutting four dovetails in total so it’s fast work.

With that done, that was the last of the joinery, and all that was left was shaping, small touches and fettling and finishing. I took the front corners off with the small ryoba and planed them ganged together to keep the sides matching, then took a small gouge and did some end-grain detail stolen again from Brian Halcombe:

Getting a little better, but still nowhere good as his are. I think I need to practice sharpening my gouges more 😀

I also took the fretsaw and my new preston spokeshave to the shelf to do some shaping work on the two ends (and got out the gouges here as well for the little bit of remaining endgrain). The shelf is a bit thick to avoid (a) sagging in the middle from the 60kg design weight (books weigh more than most people think, the standard loading is about 30kg/ft or so); and (b) thicknessing the board down too much because it turned out one side had the corner of a horrible knot in it and it was a complete pita to plane. But by planing a slope into the underside of the shelf in the last inch or two before you see it, it looks a lot thinner at first glance than it actually is – neat trick learnt from Richard Maguire’s end table videos.

You’ll notice I’ve also drilled pilot holes for the cut nails here. I bought a few boxes of those from Dictum a while back and haven’t had a chance to use them yet. They look quite nice:

For those who don’t see what the fuss is about and haven’t spent sixty hours listening to Christopher Schwarz, Roy Underhill and every youtuber with a table saw ranting about these things, they’re what nails used to look like for thousands of years until someone invented the cut wire nail a hundred years or so ago and found he could make nails that were objectively worse than the existing product in every single way and yet still be successful, so long as they were cheap. The race to the bottom is a very, very old game…

Anyway, these things look decorative and hold things together much more securely than the round nails we use today, but more than that, when the wood swells or shrinks and moves with the seasons, the nails flex with the wood which screws can’t do. This stuff lasts so long they’re still finding shipwrecks from the roman empire where the nails are holding them together.

Anyway, that’s my story about why it was okay to pay six quid for a hundred nails and I’m sticking to it 😛

And then I knocked the arises off the other edges with the preston spokeshave (that thing is rapidly taking over as my favorite tool), and with that done and everything suitably handleable (and the front of the feet turned from blocks to a less aggressive shape), it was time to do the final fitting and fettling of joints. 

It was fairly painless this time. That shelf doesn’t rock or tilt 🙂 I’m a bit pleased by that, the layout was a bit hard because the wood’s not perfectly flattened (that stupid knot on the underside looks pretty but was a pain to work). And then final finish planing before the shellac. At which point I made the happy discovery that not only do we get some lovely colour to the walnut and some lovely medullary rays in the oak, but the walnut is also lightly figured. Which was a nice unexpected surprise, but is unfortunately most prevalent on the underside. Doh.

Well, only one last thing to do before applying finish…

Fire! 😀

Turns out, a real blowtorch versus a chef’s blowtorch isn’t even a contest. A chef’s blowtorch will do creme brulee, whereas one of these weapons of mass destruction will just burn through the sugar, the creme, the dish and most of the table. They’re excellent 😀

I did nearly burn the wood though. Mental note; branding irons only need to be that hot for flesh, for wood you want them less hot. Had to take the block plane to the endgrain to clean it up a little in the end. But that was that, and now on to the shellac. First a quick test…

And we’ll go with garnet for the walnut and lemon for the oak, with maybe a last coat of blonde? Brush on the first coat, then wipe on the next three, knocking back with 0000 steel wool in between each coat.

See what I mean about that walnut? Shame that’s the underside really.
And after a few days (I just did a coat every evening after I got home):

And then it was time for assembly and glue-up. That was a lot more straightforward than I expected too because the nails effectively acted as clamps. So out with the hide glue and I didn’t even need the hot water this time to warm it because today was around 26C in the shed, the warmest day of the year so far. Glue into the stopped dados, then seat the shelf in the dado and knock it firmly home with the deadblow hammer, then drive the three nails to within 2-3mm of being fully seated; turn it over and do the other upright. Then glue in the back rails because the uprights slope inward slightly and the tension holds everything in place. Drive home the nails fully, glue the mortice and tenon joint for the feet together, stand it up and clamp the lower back rails (the upper rails couldn’t be clamped because of the slope on the far side of the upright at their level, doh. Maybe I should have drilled the dovetails for smaller decorative nails, it’s certainly a historical thing to do that).

Left everything to cure for a few hours, then painted the bottom of the feet with titebond over the shellac, and sat them down onto some nice green felt (don’t want to scratch the desk) and let that set up for a few hours before trimming off the excess with a sharp knife. And that was it, all done.

The brand looks nice actually. I was afraid it’d be a bit out of place, but it seems to blend in discretely.

Kicking myself that that figure is on the underneath of the shelf…

But those nails do just look the part, don’t they?

Obviously I need to buy more Lost Art Press books 😀

And yup, there’s the original sketches and notes as well. Not an Ikea design 😀

Thanks again to Ralph at the Accidental Woodworker blog for the idea, it worked out pretty well.