If I get time I hope to eventually video a series on freehand grinding tools and cutters.
I know many of you are experienced in this - but there are probably some out there who would benefit from a few tips.
Here is the introduction: Part 1
- New Norton QUANTUM3 Grinding Wheels: Faster Grinding, Less Down Time
- Acme cutting tool grinding and alignment tools
- Glacern Machine Tools - Vises, Toolholders, and Indexable Cutters
- Newbie- conventional grinding machine and resharping/making custom tools
- Graphics Pad for freehand carving with CNC router
Good info and video Keen!
I learned to hand grind drills just out of high school, I have hand sharpened taps as well in a pinch.
It saved lots of time and money when I did stainless work.
Keep up the good work.......
Thanks for the feedback guys - it really helps to hear when you are heading in the right direction!
I made a special 3/8" spotting drill, with an oddball angle, needed one in a hurry to make a special chamfer on a part, took maybe 20 min to cut off a 3/8" drill, thin the web, get the angle and relief right, no cost other than a bit of time and the satisfaction of being able to do it myself............
The guys in the shop would get a new drill rather than resharpen the old one, when the box got full of used ones they would throw them in the trash on cleanup day, I had probably 20 pounds of used drills that I am still using out of today 25 years later.......
lots of holes in 304 stainless will give you lots practice sharpening drills.........
Nice one. Next video: split points
The tricky bit is making sure the edges are DEAD symmetrical. If they are not the bit will drill over-size and on one edge only. I have some Chinese drill bits like that.
It depends on how critical the hole is, and how much time you can wait on a factory sharpened drill or reamer if it isnt in stock.
An old mentor showed me how to drill a tight hole or even a bit undersize, he would just touch the corners of the drill on the grinder very slightly, this will tend to push the drill lips to the center of the hole. It takes a bit of experimentation but it does work in a pinch.
Just an old "git-ur-dun" trick where time is of the essence.
I bought a Darex Drill Grinder about 15 tears ago and it was one of the best tools I ever bought. I paid about $1500.00 for it and it makes perfect drill points.
You can buy GOOD PARTS or you can buy CHEAP PARTS, but you can't buy GOOD CHEAP PARTS.