Table inserts to replace the plastic ones (hole between sandpaper & table)

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Machined table inserts (made with holesaws & angle grinder), from plate

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Pickling overnight in sulphuric acid to remove mill-scale from hot-rolled steel

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The drop on this aperture is 3.5mm, my plate (same as the plastic inserts) is 3mm…

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After pickling they are desmutted with detergent & a pan scourer

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What’s in the CAD file

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Printed 1:1, they make great stick on templates for more machining

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Making a shim to fit into the aperture

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Welding magnets placed on top

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Thin bead of silicon sealer

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Drop in shim

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Drop in large table insert

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Place magnets over hole & leave for 48 hours

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Templates stuck, centre punched, pilot drilled & cleaned

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Increased hole size to 6mm (1/4″) and countersunk both sides

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Perfect. No more misaligned levels when sanding.

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Was going to install small magnets but the inserts are fine

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Added a basket for the bits & pieces.

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Materials:
6 x 100x100x3 mm (4"x4"x1/8") plate/sheet mild steel
1 x 100x100x0.25 mm (4"x4"x0.010") shim mild steel
Silicon sealer

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Triton tools – Bobbin sander Tsps-450

knoba – bobbin sander mods – 2018.dxf

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