Lockable reinforced 20mm bench dogs
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Lockable 20mm (Festool MFT bench hole sized) Bench Dogs made with PLA but reinforced with nut and bolt.
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lockable 20mm (Festool MFT sized) Bench Dogs made with PLA but reinforced with a 5/16th 2.5" bolt and nut. Alternatively, a 60mm M8 bolt can be used to reinforce. The lockable version is printed in 4 parts to reduce the need for support, but the upper leg and head leg and head should be glued together (cyanoacrylate / super glue works fine) to prevent the leg spinning in the doghole when tightening. The only part which requires support is the lower leg, which should be printed with the hex hole down. A tree support breaks off easily leaving a relatively clean print.
The leg diameter is 20mm and fits perfectly when printed with a 0.8mm nozzle and 0.32mm layer height. The bolt fit is tight in the leg, but can be pushed in by hand, or lightly tapped on a handy workbench (not your best table), or with a hammer.
The bolt head and nut recess into hexagonal holes. The bolt head and nut can also be glued.
Once assembled, tightening the knob above the dog pulls the lower leg into the upper leg, expanding the tabs on the upper leg into the sides of the dog hole, jamming it in place. To release the dog, untighten the knob press down, then withdraw the dog.