Works 100%. Below is how to use the thing. It is rather lengthy in description, but in reality it only takes a minute. I feel not whole lotta folx had patience to figure out how to use the thing and into the far corner of farthest shelf it went, never to be tried again, in too many an HSM shop.
Disclaimer: do at your own risk. Wear eye protection. When using a bench grinder after a long break, turn it on while standing to a side.
Lemme try describing how to use it properly:
- set the proper angle (wingnut)
- tighten the 2 PS on the bottom to where the whole thing rotates/pivots w/o wobble and too much effort.
- adjust the flute index (slotted strip of steel in front, 2 PS) to stick out enough to engage the flutes of the particular drill bit
- mount the thing as shown in the picture, close to a vertical grinding surface (bench or disk grinder, I used mine even with belt grinders)
- setup the adjustable stop travel to be in ~1/8 range (more if the drill bit is really in need of serious grinding). The stop travels as you turn the knurled wheel with yer thumb. There's also adustable travel stop to control amt of movement
- drop the bit in. Do not tighten the holding screw just yet. Make sure one of drill's flutes is engaged against the index
- Here's the most critical part: with the adjustable stop moved all the way forward, slide the whole stop assy on the square shaft to where the drill bit's "cheeks" are oriented vertically. Lock the stop assy in that position . Make sure, as you do that, to have flute against the index
This way the lower cheek will be ground first and when you turn the bit
180, it will be the 2nd cheek.- move the adjustable stop back via the thumbwheel. You will advance that stop forward, in small increments, during the grinding process
- lock the drill via the holding screw (one on the very top) - still have that flute engaged against the index
- now mount the assy next to the wheel where the drill bit barely touches the grinding surface I use C-clamp for that
- turn the grinder on. Grind the bit: pivot the jig back and forth a few times, pivot it outta way, unlock the holding screw atop, advance the drill forward via the thumbwheel, making sure flute's engaged with the index, lock the screw atop, pivot some more. On last advance, you prolly want to pivot till "spark out"
- move the adjustable stop all the way back. Flip the drill bit where the "other cheek" is now on the bottom. Repeat the process.
Done
As safety, you might want to turn the grinder off in between advances.