Leonardo, it's wonderful having you back on the forum.
Only you with your analytical mind and engineering experience could provide the wonderful graph of pressure for different graver shapes and depth.
Great info for someone who is developing a cutting system.
Thank you for all your work on...
Pleurotus, my friend, you are overthinking this.
Grinding some small HS drill shanks is not going to harm your grinding wheels.
I have ground hundreds of them using the same wheel.
Just grind them slowly and keep them cool by drawing them back into a wet paper towel.
And use the same method if...
Of course Anne, that depends a lot on the metal you are cutting and how deep you are going.
A round graver usually requires more pressure than a diamond/square graver because of the larger frontal area in the metal.
Only time and practice will give you the answer for push or hammer engraving
If...
Hello Anne, and welcome to the Cafe forum and engraving.
from the sound of things your problem is the lift or belly angle of your gravers.
The front angle should be about 45-50 degrees.
And the bottom or belly should have a small and short relief cut of about 15 degrees.
On your #41 HS round...
Yes Roger, that, function over form (and ton of dollars) is why I shoot my ducks with an old Winchester Model 12 instead of a Phil Coggan/Purdey masterpiece. :)
Pleurotus, Unlike tool steel drills the shanks of most M-2 high speed drills are hardened.
That is where you had a problem by trying to heat treat it. Use it as is, test with a file.
I make most of my gravers from M-2 drills by shaping and sharpening the shank.
And I cut hard gun steel with them.
A small triangular file will make a starting graver.
And drive it with a piece of hardwood or a small rawhide mallet to soften the blows.
You can make a chasing hammer out of hex head or large carriage bolt.
Your first cut didn't look too bad, good start. Keep going.
Best of luck on your...