Drill bit sharpening block with relief angle

thingiverse

This block functions as a guide for sharpening drill bits or hand-stones when using a grinding wheel on the wheel side. Despite its simple design and user-friendly interface, sharpening precision is exceptionally high. Key features include: The ability to securely hold the bit in place with two M4 screws. Both sides of the bit can be sharpened without re-positioning it, making perfect symmetry almost effortless. A guide line helps position the bit accurately. The block has two faces, top and bottom, allowing for holding two different angle combinations. Adapters can be printed to use the same block for various bit diameters. OpenSCAD parameters can be modified to change: Tip (lip) angle Relief (clearance) angle Bit diameter (using adapters may be easier) Block size STL files are included for: Block 118° and 135°, 12° relief, 10 mm bit Block 118° and 135°, 8° relief, 10 mm bit Adapters for 2-3-4-5-6-7-8-9 mm bits Handy angle gauge Infill of 20% is sufficient. Holes for M4 screws require drilling through or tapping (a M4 nut is needed). Special thanks to: Rol for his comment on Thingiverse, http://www.thingiverse.com/thing:1024834/#comments Phil for his excellent guide on Instructables, http://www.instructables.com/id/Sharpen-Your-Drill-Bits/step16