so none of my drills look like that normally, and this one was not cutting in AL , I just needed a pilot for a bigger hole. I spotted, went to use an unused (not commonly needed) bit, and it wouldn't go. I looked at it and saw that.Not necessarily a bad grind.
Having just sharpened over 100 drills, I can say that I saw similar grinds on some. They were all sharpened with exactly the same relief, as controlled by the Drill Doctor jig but some looked enough like that the photo above for me to question whether they had been ground correctly.
The gotcha was the the grind of the web was such that the diameter at the trailing edge of the web was considerably smaller than at the cutting edge. This made the edge formed between the web and the 59º angle appear to climb up at the trailing edge. An optical illusion.
Its something that I never noticed in all the past years because I sharpened by hand and eye, rocking the drill as I turned it to give what looked like the proper relief. I never bothered to check new drills for relief as they were new. When they went dull or they chipped , I resharpened them.
The definitive test would be to blue the tip with a Sharpie and drill a hole. If the back of the web is interfering, the bluing will be worn off.
Can't tell that much from the photo. Can you zoom in and focus on the tip?
it doesn't work, the resolution is already compromised, the file is much smaller.This will work in most browsers-
Right click on the image.
Click "Open image", or "open image in new tab".
If it didn't take you there, go to the new tab.
You'll see the image. Click it one time. If it's not being shown "full size", this will make it so.
Next, CTRL+Scroll UP will expand the image. You can wring out whatever detail is available from wherever you got the image from.
Sorry, maybe I should have been more clear. This will in no way "put back" any detail that is lost, but what it does is A, bring back any level of detail that the hosting website might have, but not display right in the thread. And you can expand it to see it better. On my 15 inch display I can expand the drill bit picture from 3/8 of an inch to two inches (without forcing anything beyond the simple browser functions) Your picture, on this display, looks best at about 3/4 of an inch wide. On other displays, that would probably be vastly different. Yeah, the detail wasn't important here, but I'll be the first to confess to having a forest for the trees moment. I didn't mean to imply that it "fixes" the loss from the original, but whatever is allowed at whatever website anyone is visiting, it really helps to see all that can be seen. A lot of people just aren't aware of that. That was all I was getting at.it doesn't work, the resolution is already compromised, the file is much smaller.