Tag Archives: assembly

Alternative workbench/assembly table (Chapter five)

Finally, we embark upon the last stage of this adventure in looking at the chop (of the quick-release-vise), how the top was finished and a few examples of how the table assists with work holding. You will remember that work holding ability was one of the primary objectives behind the design of this table. The chapter concludes with a bit of a postmortem.

In the pictures below you can see how I put the chop of the quick-release-vise together. Again I used Ysterhout and created 4 square dogholes. In hind sight I made a mistake by laminating the pieces of wood between the doghole cross-grain to the rest. Since I made this chop-face the wood has moved enough to create approximately 2 mm difference at the top as well as the bottom, after starting off flush. This should not have been a surprise, but served as a useful reminder why it is generally discouraged. It does however not cause any functional limitations, but will probably lead to an immature demise of the chop. Time will tell.

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Here you can see how I flattened the face of the chop with a belt sander. I did not have anything better for the job at the time. The wood is simply too hard for a normal handplane and I still did not have my Lie-Nielsen babies back then. Even the Lie-Nielsen’s at a bedding angle of 50° (York pitch) reject this wood as unpalatable.

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Here I added purely cosmetic parts to the chop.

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Initial shaping of the chop-face on the table saw.

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A quick dry fit before final shaping, with my son Didi acting as model together with our German Shorthaired Pointer called Nietzsche. Didi is doing his rendition of O-Ren Ishii (aka Cottonmouth) in Kill Bill.

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All the Ysterhout edges were fixed to the top standing proud by a millimeter or so. In the next pictures you can see how I brought everything into one plane by careful belt sanding. I know this is a kak idea, but I honestly did not have another option at the time. The second picture does at least show that I got it reasonably flat.

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The next step was to glue in the steel ruler on two sides of the table. Although the ruler stop inside the Ysterhout edge, I set it up (by carefully removing the correct amount) so that the ruler show the measurement as of from the edge. This way I can have a stop flush with the edge, push a piece of stock against it and very quickly read the length or mark a measurement on it without having to fiddle with a tape-measure. You will remember how we recessed this area of the bench to ensure that the ruler sits flush with the top.

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Then I started drawing lines corresponding to each 10 cm on the rulers. Every second line being green and the ones in between black. This makes it easy to count in 20 cm steps. The lines are square to the sides of the table and each other, which makes it easy to set up square guides for gluing panels.

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The plywood part of the top was then sealed with floor varnish in order to have a fairly hardwearing surface that is easy to clean when wood glue is spilled on it.

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All the Ysterhout edges were treated with something called Woodoc, which as a local product that probably contains a mixture of oils. I assume it must be something like dried Linseed and/or Tung oil because it dries to a film on top of the wood after a few layers, but is easy remove or touch up if necessary. It certainly liberates the shear beauty of the Ysterhout.

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… and voilà … the final product for your perusal!!!

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Here you can see where my benchdogs live. If you are interested to see how I made these, please please the post on Bench Bitches under the category Bench accessories.

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I though I should include a few pictures illustrating how the bench assists with work holding.

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In the next few pictures you can see how the T-channel (which can be accessed through any of the  round access points rather than only the ends, as seen in the second picture) and benchdogs work in tandem to hold the two wide plane-stops in place for hand planing.

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This was an immensely satisfying project, the result of which really improves the quality of my work and the amount of pleasure I get out of spending time in the shop. Having said that, I think it is important to always think about how one could improve your work. Therefore I thought it might be useful to consider what I have learnt while building and using this table.

The main problem I have found so far has to do with the table’s overhanging edges. I other words, not having legs in the same plane as the edge of the table. This combined with the fact that the table’s main frame is made out of steel rather than wood combines to create a less solid and noisy surface when using a chisel and mallet to chop mortises for example. Even at the top of the leg it does not feel or sound as good as on a proper wooden bench with massive wooden legs. I would not change the design of the table because of this, as the ultimate objective with this table is to have a dedicated assembly table and for such a table it is much better to have the legs out of the way to improve the ease of movement around it. It might actually help someone else building a similar table to consider different options depending on their needs. I have to bear with this shortfall until I build my dedicated bench.

The next thing I have noticed is that my table is a bit too high for hand planing. Again this would not necessarily change my design as I am currently bound by the height of my table saw as this assembly table doubles up as an out-feed table. It did however help me to understand what the people who knows are on about regarding this issue. When the table is too high you end up using your arms more than your legs, which means that your control deteriorates and you get tired much quicker. I can really recommend Christopher Schwarz’s discussion on this in his book “Workbenches: from design & theory to construction & use”.

The next issue would actually change how I do it if I had to do it again. Given that I am using it as a workbench in the interim, I think I should have used proper wood for the top rather than plywood. I would also increase the thickness of the top while doing so.

Finally, I think I should have borrowed a router (as I did not have one at the time) to do the dogholes with. That would have done a much better job in terms of getting the holes 100% square to the working surface.

I do hope that someone will be able to learn something from this or at least get a few ideas for their own table/bench.

 

Alternative workbench/assembly table (Chapter four)

I am pleased to finally relieve your vehement anticipation for the next chapter in our fantastical journey in building a makeshift workbench that is ultimately destined to become a dedicated assembly table. In this chapter we will concentrate on the creation of the edges of the table. The edges (of the table) were designed to enhance the table’s ability to hold boards while one works it’s edges (of the boards). It is also designed to make it easy to attach various future jigs and modifications.

I decided to use Ysterhout (Olea capensis macrocarpa) for this purpose, due to it’s high specific gravity. Most sources have it at > 1.0 which means that it sinks in water, the way I understand the measurement. The Ysterhout I used certainly does sink. I actually tried it. This beautiful species of wood is extremely hardwearing (Janka side hardness 10,050–13,750 N and Janka end hardness 9780–14,200 N), which I thought would be ideal on the edges of a table that is going to slave away as a workbench for a few years. Check out the je ne sais quoi of these Ysterhout trees.

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The problem with my Ysterhout is that it likes moving so much that I am always relieved to find it in the shop. I constantly worry that it might move to another neighborhood. This was the reasoning behind first building a fairly stable plywood apron to attach the Ysterhout edges to. The idea being that the former would keep the latter on the straight and narrow.

As a reminder of what I was aiming for in terms of these edges, see the Sketchup drawing below. I wanted to create a large sturdy T-channel for all the reasons above. As with most things, you can not readily buy something like this in Namibia so I came up with this plan.

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In the pictures below you can see were the process started. Two differently dimensioned Ysterhout strips for each of three sides of the table and their angle iron friends already cut to size.

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The preparation of the angle iron included drilling holes, countersinking them (in order to screw it to the Ysterhout) and treatment with a rust converter.

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The next step was to screw them into place with steel wood screws. In the first picture you can see how I clamped the two parts in order to keep the Ysterhout straight for the screwing activity to follow. No don’t worry we are not about to leap into porn, this is a family website.

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The Ysterhout-angle-iron-constituents were then screwed to the aprons and tabletop. The profusion of f-style clamps were needed to coax the ysterhout into position.

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Here you can see the table with the edges/T-channels in place on three sides. The side without a T-channel is the one on the opposite end where we installed the metal self-release-vise earlier in this epoch. I apologise for the poor quality of these pictures. It looks like I had some sawdust on the lens.

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Below you can see a quick test of the T-channel system, accepting a Festool mitre gage and a Bessey F-style clamp with considerable ease.

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Then I started with the really scary part of the edge attachment on the side of the table were the quick-release-vise live. What made this nerve-racking was the idea of having to use wider ysterhout boards and on top of that laminating two together in order to create the added thickness to encapsulate the inside face of the quick-release-vise. I wanted to enclose the inside face to create one flat surface on the entire edge of that end of the table.

In the pictures I chose you can follow the steps in preparing the edge. I removed a rectangular section from the inside board corresponding to the inside face of the vise before laminating it to the outside board. This was much easier than trying to chisel out the area after lamination. One would destroy several chisels (and probably limbs too) attempting to do that.

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All those screws were needed in conjunction with heaps of clamps to get the two pieces of ysterhout (each with it’s own ideas) to adhere to my intended configuration. You will not believe me if I tell you how much effort it took to do this, so I will not even try.

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Prior to attaching the edge I first inserted six 8mm nuts on the inside of the ysterhout communicating with 9 mm holes through to the outside. The idea with this was to created six points were one could easily attach various gadgets in future without having to first modify the table at all. You simply bolt the contraption of what ever nature to the edge with an 8 mm bolt or two.

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The only way I could flatten this monster was with a belt sander. Yes I know that is not the best way, but nothing else that I had available to me at the time made any impression on the wood. Therefore careful belt sander use and some serious sanding by hand enabled me to get it pretty damn flat. In the pictures below you can also see the cutout meant to open up the T-channel at each end of this ysterhout edge.

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Installing this edge was a mission in itself. First I rubbed grease on the inside face of the quick-release-vise. Then I mixed epoxy putty to fill in the 2-3 mm gap between the inside face of the vise and the recessed area of the ysterhout edge. The grease was meant to ensure that the putty does not stick to the inside face in case I ever need to remove the edge for some or other reason.

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The edge was then screwed to the table with 15 of the steel screws pictured. They are 5 x 100 mm each and again I had to use clamps as well to persuade the ysterhout to comply.

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That then concludes this chapter. Next time we will look at how I made the chop (at least I think that is what you call the wood that is meant to cover the moving jaw of the vise) and finished off the table. Hurrah!!!

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