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Next semester I will be teaching a hand tools class at an adult education school with a complete woodworking shop. However, the workbenches (salvaged from a middle school) are in terribly bad shape. They are sturdy enough, but the tops are not at all flat. It would be nice to machine plane these, unfortunately, the benches are full of hardware – that is, nails. Hand planing these surfaces would be an immense job and again risky with the embedded hardware.
I have been working on a fix that requires a number of portable Planing Sleds that would offer a flat surface for hand planing small lumber. I quickly get a picture in my head of the design, and quickly want to open SketchUp to capture this.
And so, this is a process I go through quite often in creating a new piece. I don’t bother with pencil and paper sketches – that would only slow me down. I begin to layout the pieces as they appear in my mind. I’m not critical on sizing or shapes, as these parameters are easily adjusted in the SketchUp model. My immediate intention is to get a rough preliminary model, without joints or embellishment.
I’ll stop after spending an hour or two. I need to rest and give my brain some space to think about the design. Usually, new issues and solutions will come to me at night. In the morning, I’m anxious to try out these ideas in the SketchUp model.
But before moving to the next iteration, I Save the existing version. This has been an important step in my design process – often, I will come back to an earlier stage of design, and re-incorporate various features. I’ve found that I end up with an average of six or seven model files with a numbered suffix of 1, 2, 3, 4, etc.
Now back to the Planing Sled. My first iteration looks like this.
A later version substantially beefed-up the design with heavier rails and a plywood platform.
I thought it might be easier for students making this platform to replace the dovetail connections with nailed – rabbet joints. I also incorporated Dogs in the platform.
In a later version, I changed the corner joinery and the End fence arrangement. I think the dovetails will actually make it easier to position and connect the frame. Nailing into hardwood can be problematic – splitting, bent nails, and driving the rail out of position. It was nice to return back to an earlier saved version to capture the dovetail work. The Fence is now a removable and replaceable component, and the two End components are identical.
So here is where I ended up – version 4.
I tried building one using the nailed rabbet joints and had the difficulties expressed above.
I would be interested in feedback from readers on any experience with this workbench issue and ways to resolve.
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Lanier, thank you for the good suggestions.
If you aim is to flatten the becnhtops, another approach would be to use a portable belt sander. You might tear up a few belts on the nails, but that would be minor compared to planes or planer blades. When you get the tops reasonably flat if there are a significant number of nails you could overlay the tops with 3/4" MDF for a surface you could safely use hand tools on.
Another solution would be a second fence along one side to brace the board you are planing in two dimensions, rather than the dogs. That would be better than a single fence, particularly if you are trying to skew the plane.
To: jwarshafsky: Thank you for your comments. Your planing method is certainly the best. I remember Ian Kirby teaching to plane against a stop only, and to not rely on pinching the board between dogs, as that causes problems.
Perhaps I should just remove the dog holes and rely on the front stop only. However, I know how often I use the dogs on my European bench to hold things.
I plan on teaching students to plane without the dogs, It is faster than messing with the wedges. But I also planned for use of the dogs, where necessary.
I find that hand planing is best done against a stop, that way the board that is being planed can provide feed back. If for example you are planing the 3/4" edge of a board say a 3/4" x 3"x 36" and it is against a stop and it it tips over then you are not planing correctly and need to reevaluate whats going on.While beginners may find this makes learning to plane a bit of a steeper of a curve I think in the long run they will be better for it. I really cannot think of any time that I hand plane unless the board is against a stop. So maybe just make a large bench hook to get these guys started or a simple "V" to wedge a board in to.
Thanks for all your great Sketchup help.
What a practical design!
I have been trying to Migrate from AutoDesk INVENTOR 2013 into SketchUp 8 with the help of Dave Richards.
ALL TOO FAMILIAR TRANSITIONAL DIFFICULTIES - "Old Guy - New Process."
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