Roubo is Coming… Part 12


With the legs assembled I could check the final width of the slab

The slab is now processed on five of its six surfaces, with only the top left to flatten (which will wait until the bench has been assembled). The final surface to be cleaned up in this stage of the build was the rear edge of the slab, and this the one area where my approach to the build has created a little extra work. In his book, Chris recommends processing the slab first, so that the stretchers are cut to suit the final size of the slab. However, because I decided to limber up for this build by preparing the undercarriage first, I had to size the slab to suit the stretchers. To be honest, this was not too much extra work, and given the time it has taken to get this far into the build, I’m glad I didn’t work on the slab when I first started, as it would likely have moved again in the intervening months.


Direct measurement from components reduces the risk of error

The rear edge does not need to be square, or super flat, but it does need to be of the same width as the legs and short stretchers. Whenever possible, I prefer to avoid measuring, and so to test how close the slab was to final width, I assembled the legs and short stretchers, and placed them in position on the slab. I’ll admit that this was also for my own curiosity and to get a sense of the scale of the bench. With the legs in situ, I could see that the slab was 11/16″ too wide – not a huge amount in the grand scheme of things, but more than I could want to remove with a jack plane from a 6″ thick, 102″ long slab or pretty truculent oak. Instead, I decided to rip the waste off with my 119 year old Disston D8 handsaw.


Ripping the slab to width. Yes this felt like work, but with patience it is possible to accurately cut 6″ thick oak by hand.

To provide a line to cut to, I set my panel gauge to the width of a pair of legs (still no measuring), and struck a line down the slab. When cutting 6″ thick timber, the key is to go slow and steady, and to keep the saw plate lubricated with plenty of mutton tallow. I used an overhand ripping grip for most of this work, alternating occasionally to lay down a guide kerf by sawing at a shallow angle to the top of the workpiece.


The waste has been ripped off

Once I had ripped the waste off, I rotated the slab (with assistance from my ever-helpful slab moving team) so that the freshly cut edge was facing up, and the slab was resting on the saw benches (in the same position as when I worked the front edge). The rear edge is not bang on perpendicular to the underside of the slab, nor is it dead nuts straight. But it is within perfectly acceptable tolerances for this surface. I spent a few minutes cleaning up the area where the rear legs are situated with a jack plane, so that these are perpendicular to the underside, as this will make for an easier layout when cutting the leg joinery (the next stage of the build).


Tuning the area where the leg joinery will be cut

The slab is now ready for the leg joinery to be cut, which means that we will be moving it back into storage while I cut the double tenon on the legs. The build is continuing to progress smoothly, and I am aiming to assemble the bench shortly after I get back from teaching at the Lost Art Press storefront in September.


The slab is processed on all surfaces save for the top, which will happen once the bench is assembled.

Roubo Is Coming… Part 11

So far every step of the Roubo build has been spent on processes which directly contribute to the structural integrity of the bench, or which affect its usability. And it has all been great fun. Sometimes though it is nice to do some work that has no bearing on how a project functions, and is purely about decoration. So, while the slab was in the right position, and the weather made for a nice evening in the ‘shop, this week I inlayed the plaque that Jenny Bower engraved for the bench. This was really enjoyable work – most of my inlay experience is for irregular, and much smaller, shaped pieces for guitar inlay. The large and regular sized of the plaque was a nice change of scale, although the processes are very much the same.

When I originally commissioned Jenny to engrave the plaque, my intention was to inlay it in the vise chop, where it would be prominently displayed. While that is still a good location, it did occur to me that the vise chop could conceivably be separated to the bench in decades time. So I decided instead to inlay the plaque to the face edge of the slab top, to the left hand end of the bench where it would be seen every time I entered the shop.

Having determined the final location, I placed the plaque on the slab and traced round it with a marking knife, using several passes and light pressure to cut a clean line without pushing the plaque out of position. Crisp inlay requires a clean edge to the recess, and I like to deepen my layout lines with a wide chisel (in this instance a 2″ butt chisel) and a sharp rap from a mallet. I then pared a shallow tough into the layout line, using the same chisel, and working from the waste side outwards. This is similar to preparing a “first class cut” for joinery, and helps to prevent any cutting tools straying over the edge of the inlay recess.

With the edge of the recess cleanly established, excavating the recess was easily done with a large router plane, working down the depth incrementally until the plaque was sitting just a hair below the surface. The corners of the recess were a little tight for the large router plane to reach, but a No271 router plane with a spear-tip blade reached into those with little trouble (collecting the unusual blades for this tool does occasionally pay off, even if 95% of the work is with the standard square tip blade!).

A test fit of the plaque showed that it pressed into place nicely. The brass, and Jenny’s outstanding engraving work adds a touch of personalisation and class to this monolithic bench. The workbench should outlast me (and in all likelihood the Apprentice’s grandchildren), and so knowing that my logo will be carried into the future in this way is very humbling.

Roubo Is Coming… Part 10


In position, and ready for the reference face to be trued up

After flattening the underside of the slab, the next surface to be processed is the edge which will face outwards when in use. This edge needs to be both straight, and perpendicular to the underside, to facilitate laying out the leg joinery, and because it will be a clamping surface when the bench is in use. With the help of my slab-manouvering assistants, the slab was moved onto my saw benches with the rear edge resting on the saw benches, and clamped to my Sjoberg workbench so that (what will be) the top of the slab was facing the workbench, and the show edge was facing upwards. The staked saw benches I built from the Anarchist’s Design Book are the unsung heroes in my workshop – they are constantly in use and are so versatile that only a fraction of their time is spent being used as saw benches. They have proved to be invaluable for this build, and have even taken the weight of the slab (which is a 4 person lift) without complaining.


I never thought my No8 would look small, but this project does so

Planing a 110″ long, 6″ wide, edge is very different to jointing a furniture-sized board, and a clear plan is needed if you are to work efficiently and avoid chasing your tail. My plan was to get the long edges straight and flat, and then make adjustments as necessary to bring the edge to a clean 90 degrees from the flattened underside. Before I reached for any planes however, I checked the edge with a 50″ straight edge to see what I was working with. Halfway along the slab was a large knot where a branch had grown. That knot was a fair amount below the surface of the slab, and the edge of the slab had a gentle concave curve, the apex of which was located at this knot. A light swipe with a plane showed that the grain reversed around the knot, so that on each half of the slab the grain flowed from the end towards the knot.


A sharp low angle plane is perfect for cleaning up wild grain

While this created extra work than if the slab had been closer to flat, it also suggested a straight forward solution. I worked the curve out of the edge, working from each end towards the middle of the length, using my No5 set to a rank cut. Once the curve had largely been removed, I moved to the No8 jointer to get things really straight. The grain around the knot was swirling and generally uncooperative, although moving to a low angle block plane tamed things quite easily. I am sure some folk would have flipped the slab over to avoid this knot, however I decided to stick to this orientation of the slab because the crotch wood, now it has been cleaned up, is really quite striking and will add a nice visual feature. On a practical level, turning the slab around is no trivial matter, and also requires my team of willing helpers to be available, which would slow down progress of the bench build for several  days. So in this orientation the slab will stay.


It ain’t square until Dr Vesper says its square

Now that the edge was flat and straight I was able to check how close to perpendicular it was to the underside. A few spots required fine tuning, and for this task I quite like a No3 smoothing plane. Set to a fine cut, the smoothing plane is small enough to subtle adjustments to localised spots, which is exactly what I needed here.


Marking the ends of the bench top

With the reference side and faces processed, I was able to remove the excess length. I deliberately ordered a slab longer than I needed so that I could trim any horrors found at the ends, and this meant that there was just over 8″ to remove to bring it down to the 8 pied a roi final length. The slab was in the perfect position to trim the ends, and so I struck a line with a 0.9mm pencil and 24″ combination square, and then cut to that line with a coarse filed cross-cut saw. The surface left by the Skelton Panel Saw is very good, so I will likely leave the trimmed ends as they currently are, without any dressing from a plane.


The Skelton Panel Saw is basically a meat-powered chain saw, but cutting a 6″ thick, 23″ wide slab still felt a lot like work.

There is one small task left to do while the slab is in its current position, and then it will be time to flip it over and dress the rear edge. Which means that most of the work on the slab is done for now, and soon it will be time to cut the iconic leg joinery – an operation I am really looking forward to.


The slab is now trimmed to length, and just needs the rear edge dressing

Roubo Is Coming… Part 9


The slab in the rough

After working on my article for Mortise and Tenon over the past few months (a piece I really enjoyed building) it feels good to be returning to the Roubo bench build. Having built the undercarriage, save for the leg joinery, it is now time for a stage of the build I’ve been simultaneously anticipating and overawed by – processing the slab top. There are no two ways about it – this is the single largest piece of timber I’ve ever worked on, and although I trust in my core skill set, tackling something of this size is a little awe inspiring.


The No5 and scrub did all the heavy lifting on this stage of the build

The first challenge is how to move and set up something this size for working. Over this year I’ve been brainstorming workholding solutions, and finally it was a conversation with Mark Hicks (who builds these for a living) that convinced me I was overcomplicating something that was very simple, and that I should just put the slab on my existing workbench. It turns out Mark was right on the money – while the slab overhangs my Sjoberg bench by several feet at each end, the sheer weight of timber keeps it in place. Getting it there looked like a bit of a challenge, but I was able to call upon the assistance of my father and a couple of friends. Between four of us, the lift was manageable and we got the slab into position with a minimum of salty language.


Chamfering the far side to avoid spelching

Processing the slab is just like flattening any other board, only much, much bigger. I decided to flatten the underside first, as the top does not need working until the bench is assembled. The key to working timber of this size is limiting the number of rotations or lifts you have to achieve. Roubo suggests that the slab should be orientated heart-side up so that it tightens around the leg joinery as it dries out. My slab has some pith at one end (pictured above) but as I’m finding, one of the key mindsets for this bench is to use the material you have available, and do not worry about any imperfections (mainly because it is nigh on impossible to get timber of this scale which does not have knots, checking, or some pith).

Before reaching for my planes, I checked the slab for twist and was very pleased to find that there was only minimal twist at the very ends. If I scooted my winding sticks in by a couple of inches, the twist all but disappeared, and as the slab is currently 8″ over length, I’ll be able to trim off the twisted ends. A quick check with a straight edge showed that the slab was broadly flat across the length, and had a bit of gentle cupping consistently across the width.


Traversing the grain with the No5

Just as lifting the slab is not a job for one, I decided to call in help for flattening the underside. My father was kind enough to join me in the shop today, and we had some long-overdue father-son time working some orney oak – he with the Lie-Nielsen scrub plane and me with the No5. The combination of scrub and jack worked very well – some of the knots which repelled my jack were easily dressed by the more aggressive (3″ radius) blade on the scrub. After planing a healthy chamfer on the far side of the slab, we traversed the grain until the surface was deadnuts flat across the width, with only mild undulations along the length. I then followed by traversing with the No8 jointer, skewing the plane to 45 degrees in order to remove the highspots along the length. The result is a slab that right now is flat (it will continue to move with seasonal variations in humidity for a while, but I can keep the top flat as it does). A few solitary low spots remain, but these are cosmetic rather than anything else, and as it is the underside of the bench I don’t see any merit in removing a lot of material to dress those divots. I would much rather keep the material on the bench, and have a few rough sawn patches where no one can see.

The next task will be to assemble my merry band of helpers to rotate the slab onto its edge, and dress the show-face so that it is straight and perpendicular to the underside. I also need to trim 8″ off the ends, which I will do once the reference edge has been trued up.


The flattened slab



The Final Piece of the Puzzle


Holdfasts have been central to the way I have worked over the past four years, and they are a critical workholding strategy for the Roubo bench. A hefty bench, such as my oak Roubo build, deserves a big hefty holdfast. The distintive holdfasts detailed in With All the Precision Possible are much larger than many modern designs, and I wanted something which would fit the overbuilt vibe of the bench. Specifically, I wanted a Crucible Tool holdfast, or one of Peter Ross’ amazing full scale “Roubo” holdfasts.

Unfortunately Crucible do not ship internationally, but a tip-off over Instagram led me to Hyvlar – a Swedish tool seller who stock Crucible tools and are happy to ship across Europe. My Crucible holdfast arrived today, and while I do not yet have any 1″ diameter holes to test it in, it appears to be an impressive tool. The design is very similar to the engravings in Roubo’s manuscript, and the large size and rough cast texture will complement the oak bench nicely. Of course, none of that matters unless the holdfast can steady workpieces, but everything I have heard from folk who use these holdfasts is that they hold like the dickens. I’m looking forward to putting this holdfast through its paces, and will report back once the Roubo bench is in use.

I’ll be keeping my current 3/4″ holdfast, and may well bore a 3/4″ diameter hole in each of my saw benches to assist with holding stock in place.

In Print the “hard way”


Issue 285 of Furniture & Cabinetmaking is now in print, and mark the launch of a 12 month series I am writing about building the slab top oak Roubo bench (the magazine cover dryly refers to buuilding “a traditional Roubo bench, the hard way”). Every month we’ll be looking at one aspect of the bench build and covering it in detail. If traditional workbenches aren’t your cup of tea, not to fear as Mark Harrell continues his series on saw sharpening, Richard Wile examines a range of pencils for workshop use, and Derek Jones continues his bog oak box build. There is also a fascinating profile on the Gandolfi camera company.