/diy/ - Do It Yourself

>>2584323
>Yes anon, the tip of the web which is called the chisel... somehow stops being called the chisel when you relieve it a bit!

I've only ever really heard it generically referred to as a point, with "chisel" specifically referring to the un-modified shape you get without any special grinding. Call it whatever you want, I don't actually care.

>grinding the "web" makes it weaker.
I never even said anything close to that.

>Earlier you claimed that the chisels "doesn't cut as effectively"
>Then down here you claim it doesnt cut at all with large drill, but somehow it doesnt cut but bulldozes on small drills.

You can put words in my mouth all you want, that doesn't mean it's what I said.

>Claiming that rake angles change on cutting edges the farther they go out from the center\
From Mitsubishi: "The rake angle of the cutting edge of a drill reduces toward the centre, and it changes into a negative angle at the chisel edge."

Also, from the same page: "During drilling, the centre of a drill crushes the work, generating 50–70% of the cutting resistance"

https://www.mitsubishicarbide.net/contents/mhg/enuk/html/product/technical_information/information/drill_terminology_web.html

>Trying to pretend like my spotting picture (which I literally named spot) isnt the exact depiction of the phenomenon I talked about.
It isn't, because that effect only applies before the edge of the flutes enter the hole, at which point they hold the cutting edges in place.

>Tell them how you are so incompetent, you couldnt even tap mild steel and had to come to the machinist thread begging for help.
Oh, so you know why Irwin taps slathered with Tap Magic and held in a guide didn't work right when used as directed? Do tell, I never did get a good answer.


It's one thing to constructively criticize someone. It's another to be wrong while doing it. But being a confrontational dbag while doing it is how you hit the bottom of the barrel.