Book shelf pin hole jig drill alignment tool
thingiverse
there are many store bought shelf pin jigs available but most of them are expensive so I simple designed one myself. Typical shell pins are 5mm in diameter but the jig has 9.6mm holes. This is because it needs to be used not with a 5mm drill but with a self centering drill. The self centering drill I bought has a 9,6mm outer diameter and a 5mm drill. Using this I won' t damage my jig while drilling. I bought this one from aliexpress: https://www.aliexpress.com/item/NEW-2-Sizes-HSS-Brass-Self-Centering-Hinge-Twist-Drill-Bits-1-4-5mm-Screw-Hole/32798182907.html?spm=a2g0s.9042311.0.0.iWCz5n
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