I made this drill sharpening jig several years ago. I used a piece of 25mm square bar, linished it, milled a V for the drill, cut a 2mm slot down the centre for 110mm, drilled a stepped hole through: 5mm for 30mm and then 11.5 mm for the remaining 110mm. I had to extend an old 11.5mm drill and grind flat on the end so I could machine the end of the hole flat for a stepped bush to run on. I also drilled a couple of debris drain holes and tapped a few 5mm holes for mounting the slide plate, the end plate and the drill clamp. As you can see from the pics there are quite a few bits inside.
The 5mm advance rod was turned down to 3.5 on the end and a 5mm bush with collar was shrunk in place for the end bushing. I turned a bit of stock to 7mm, threaded the inside to 5mm x .8, fashioned a single wing and tacked it to the nut. The bush on the advance end was machined to 7mm with a collar, machined down to fit a 9mm spanner, and threaded inside the same as the advance screw. When screwed into place it’s locked off with a locknut. The plate on the end has a backlash adjuster and locknut and also acts as the outer bearing for the advance screw bush. The end plate is fixed by two 5mm allen heads which I had to turn down to accommodate the backlash adjuster locknut. To the rear of that are the thumb lock nut and the thumb adjuster.
The drill clamp U piece is attached via two 5mm allen heads. I machined a stepped 5mm nut and shrunk it into the top of the U piece. The adjuster screw has a thumb nut attached at the top and the adjuster screw pushes an H shaped plate down onto the drill flutes.
It will accommodate drills from 13mm down to 2mm, but in reality anything under 3mm would be easier ground by hand.
I also had to make a table to slide the jig along, just a couple of flat steel sections welded to a support and a gap down the centre filed to an exact size to allow the jig to be slid side to side without any play.
To complete the build I made the wooden storage box and wrote drill sharpening jig in Chinese script on top, we all know only the best tools come from China, right?
The 5mm advance rod was turned down to 3.5 on the end and a 5mm bush with collar was shrunk in place for the end bushing. I turned a bit of stock to 7mm, threaded the inside to 5mm x .8, fashioned a single wing and tacked it to the nut. The bush on the advance end was machined to 7mm with a collar, machined down to fit a 9mm spanner, and threaded inside the same as the advance screw. When screwed into place it’s locked off with a locknut. The plate on the end has a backlash adjuster and locknut and also acts as the outer bearing for the advance screw bush. The end plate is fixed by two 5mm allen heads which I had to turn down to accommodate the backlash adjuster locknut. To the rear of that are the thumb lock nut and the thumb adjuster.
The drill clamp U piece is attached via two 5mm allen heads. I machined a stepped 5mm nut and shrunk it into the top of the U piece. The adjuster screw has a thumb nut attached at the top and the adjuster screw pushes an H shaped plate down onto the drill flutes.
It will accommodate drills from 13mm down to 2mm, but in reality anything under 3mm would be easier ground by hand.
I also had to make a table to slide the jig along, just a couple of flat steel sections welded to a support and a gap down the centre filed to an exact size to allow the jig to be slid side to side without any play.
To complete the build I made the wooden storage box and wrote drill sharpening jig in Chinese script on top, we all know only the best tools come from China, right?
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