80 lines
3.8 KiB
Markdown
80 lines
3.8 KiB
Markdown
# roubo
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[OpenSCAD](https://openscad.org/) model of a 'roubo' style carpentry bench.
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The 'roubo' bench is a style of woodworking bench constructed primarily from
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softwood and without metal fastenings, traditional in parts of east Asia. The
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internally threaded blocks for the two vices are clearly turned from close-
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grained hardwood; I suspect the moving block for the end vice, and
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the treenails and locking wedges, should also be hardwood.
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All dimensions in this model are in millimetres.
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If reasonable sizes for top planks include 150mm (which is
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what we have) then the maximum possible diameter of a vice
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screw is 25mm; which means we may as well use commercial
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metal threaded rod. A wooden screw that small would be
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finicky to make and pretty fragile.
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if you can get 200x75mm for the top planks then a turned wooden screw
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may become more practical, but I have not parameterised the screw
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diameter
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This file is partially constructed from analysis of [this video](https://www.youtube.com/watch?v=XhAEbklxJME).
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Key points:
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1. 1:55-3:08 leg top joint detail
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2. 3:10-7:50 top plank end tenon detail
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3. 7:50-9:20 cutting end vice slot (I don't think the cutting of the internal slot for the end vice moving block is ever shown)
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4. 9:30-10:14 dowels to assemble top planks
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5. 10:24-13:25 detail of end vice assembly
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6. 10:24-13-09 top end cap assembly
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7. 13:30-14:20 cutting end tenons of leg cross brace
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8. 14:20-16:40; 19:30-20:00 front vice assembly
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9. 16:42-17:08 assembling leg cross brace
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10. 17:20-18:05 leg longitudinal brace
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11. 18:20-18:55 assembling leg assembly to top assembly
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This model is parameterised and is resizeable within limits, but if you vary any dimenstion by more than about 25% you're probably going to need to do some rework.
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Colours are for clarity only.
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## Parameters
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height=950, width=1500, nplanks=4, ndowels=4, plank_width=150, plank_gap=20, top_thickness=75, leg_section=100
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The following parameters may be passed to the `bench` module:
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| Parameter | Default | Documentation | Sensible range |
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| ------------- | ------- | --------------------------------------------------------- | -------------- |
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| height | 950 | height of bench top | 800-1100 |
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| width | 1500 | overall width of the bench, excluding the end vice winder | 1200-2000 |
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| nplanks | 4 | number of planks comprising the top | 2-5 |
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| ndowels | 4 | number of dowels joining each adjacent plank pair | 2-8 |
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| plank_width | 150 | width of each plank | 150-300 |
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| plank_gap | 20 | gap between each pair of planks | 0-20 |
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| top_thickness | 75 | thickness of the planks comprising the top | 60-100 |
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| leg_section | 100 | thickness of the (square section) legs | 75-150 |
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## Errata/todo:
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1. locking wedges and treenails are generally not present in this
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drawing;
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2. mortices and holes for wedges and treenails are not all present;
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3. two of the tapered mortices for the longitudinal braces are the
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wrong way round;
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4. while all tenons are modelled, not all mortices are; where a tenon
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intersects an apparently solid piece, assume there is a mortice!
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5. screw threads are not yet modelled.
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## SVG files
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The SVG files in this repository are hand drawn rather than being auto-generated off the model, since I don't (yet) know how to auto-generate elevations from an OpenSCAD model. They should be treated as somewhat schematic, since all the dimensions are a bit variable.
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## Licence
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[Creative Commons Attribution/Non-commercial/Share Alike](https://creativecommons.org/licenses/by-nc-sa/4.0/deed.en)
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