Spool winder unwinder

Takes many sized spools
knoba - spool winder unwinder

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knoba - spool winder unwinder

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knoba - spool winder unwinder

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Wire holder & hex key holder
knoba - spool winder unwinder

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Adjustable friction clutch
knoba - spool winder unwinder

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What’s in the CAD file…
knoba - spool winder unwinder

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Materials:
1 x 142x100x6 mm (5 5/8"x4"x1/4") plate/sheet mild steel
2 x 50x80x3 mm (2"x3 1/8"x1/8") plate/sheet mild steel
4 x m5x12 mm (3/16"x1/2") socket head bzp machine screws
4 x 12mm (1/2") o/d rubber stick on feet
2 x 25x30 mm (1"x1 1/4") nylon 6-6
3 x M6 (1/4") stainless steel penny washers
1 x M6 (1/4") felt, penny washer size
1 x M6 (1/4") conical spring
1 x M6 (1/4") thumb wheel
2 x M4 (3/16") grub screws
1 x M6 (1/4") circlip, or e-clip, or any other axial load shaft retainer
1 x 250x6 mm (10"x1/4") stainless steel bar
Some paint
& a handle (wood, metal, I used beads for jewellery)

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knoba – spool winder unwinder – 2018.dxf

knoba – thunb wheel jig

Rapid electronics – stick on rubber feet

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Bobbin sander mods

Table inserts to replace the plastic ones (hole between sandpaper & table)
knoba - bobbin sander mods

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Machined table inserts (made with holesaws & angle grinder), from plate
knoba - bobbin sander mods

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Pickling overnight in sulphuric acid to remove mill-scale from hot-rolled steel
knoba - bobbin sander mods

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

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After pickling they are desmutted with detergent & a pan scourer
knoba - bobbin sander mods

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What’s in the CAD file
knoba - bobbin sander mods

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Printed 1:1, they make great stick on templates for more machining
knoba - bobbin sander mods

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Making a shim to fit into the aperture
knoba - bobbin sander mods

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Welding magnets placed on top
knoba - bobbin sander mods

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Thin bead of silicon sealer
knoba - bobbin sander mods

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Drop in shim
knoba - bobbin sander mods

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Drop in large table insert
knoba - bobbin sander mods

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Place magnets over hole & leave for 48 hours
knoba - bobbin sander mods

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Templates stuck, centre punched, pilot drilled & cleaned
knoba - bobbin sander mods

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Increased hole size to 6mm (1/4″) and countersunk both sides
knoba - bobbin sander mods

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Perfect. No more misaligned levels when sanding.
knoba - bobbin sander mods

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Was going to install small magnets but the inserts are fine
knoba - bobbin sander mods

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Added a basket for the bits & pieces.
knoba - bobbin sander mods

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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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