- Ken Vaughan’s Fossicking Stand
- Stand Setup
- 3D Modelled Parts
- Stand Disassembled
- Stand Parts
- Construction Notes
- Differences With 3D Model Version
Ken Vaughan’s Fossicking Stand
Made and owned by Ken Vaughan. Photographs taken and measurements made on 12 September 2020 at CMLC by John Heenan.
This is a particularly lightweight and convenient folding sieve stand that is easy to construct with inexpensive tools. It features an adapter to take two different diameter poles. The stand will work with two 12 inch sieves on top of each other, such as 3⁄4 inch (19 mm) mesh sieve on top of a 3⁄8 inch (10 mm) mesh sieve.
Please click on images below to enlarge.
3D Modelled Parts
3D Modelled Parts
|Aluminium tubing||22 mm outer diameter, 1 mm wall, 107 mm length||Contains fixed upper dowel and lower dowel adapter|
|Upper fixed dowel||18 mm outer diameter, 47 mm length, 47mm diameter drilled through, 12 mm diameter hole at top 10mm depth||Fixed into tubing using six punch holes|
|Lower adapter dowel||18 mm outer diameter, 60 mm length, 10 mm diameter drilled through for 50 mm||Adapter for 3⁄8 inch pole|
|M6 bolt||Dome head M6 bolt, 6 mm outer diameter thread, at least 50mm thread length||For fixing arms|
|2 x M6 nuts||Thin nuts for bolt||Tighten each bolt into the other|
|Upper arm||Aluminium plate 20 mm wide, 3 mm thick, 365mm long||Shape to fit using a vice with lower arm|
|Lower arm||Aluminium 20 mm wide, 3 mm thick, 350mm long||Shape to fit using a vice with upper arm|
One or two stacked 12 inch diameter sieves. If stacked then typically
- 3⁄4 inch (19 mm) or 1⁄2 inch (13 mm) mesh sieve on top
- 3⁄8 inch (10 mm) or 1⁄4 inch (6 mm) mesh sieve on bottom.
Two support poles, typically rebar with each filed or angle grinded at end to a point to hammer into ground easily.
- 1.27 meters of 3⁄4 inch (19 mm) rebar
- 1.00 meters of 3⁄8 inch (10 mm) rebar (such as yellow safety rebar)
Cheap offcuts of aluminium hollow tubing and aluminium flat plate can be used
Tools required include a hacksaw, drill, vice, a hand punch and file. However an angle grinder is handy to make a pointed end out of a larger rebar pole. The vice can be wooden or metal. The vice is used to gently shape the arms to fit the 12 inch sieves.
The dowels can be wrapped in plastic tape.
While it may not look robust, the long length of the bolt and the long length of the tubing with the two dowels ensure there is a secure grip.
The upper dowel is fixed into tubing with six holes from a hand punch, three on each side forming a triangle. Each three are about 15 mm apart and start about 15mm from the top of the tubing. The triangles are inverted from each other
|One side||Other side|
The lower dowel is an adapter for the smaller diameter pole.
When shaping the arms with a vice it is advisable to tape them both together. You should also physically mark each arm, as shown in image above, on the same side to ensure a good match when folded.
Differences With 3D Model Version
Some screenshots from the 3D model in Blender are included in the gallery above with measurements and text.
While the 3D model shows distinct bend points in the arms this is not the way Ken made his. The distinct points are for four reasons:
- It is too difficult to get usable measurement points with the way Ken made his.
- Even if measurement points were made they are not particularly useful for home constructors using a vice who need to gently control how the aluminium bends and adjust to fit sieves.
- Easier to design a 3D model with distinctly defined points
- Easier to automate manufacture with distinct points and so encourage manufacturing of kits.
So if you build this yourself with simple tools it is suggested you use Ken’s method with trial and error fit. Manufactures, if interested, can adapt the design to best fit their own processes.
The 3D model was constructed with Blender software. Blender software, unlike AutoCAD, is not ‘design for manufacturing’ software. However a 3D model STL format file exported from Blender is available. The STL file does not include the measurements or text in the Blender screenshots above.