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The drill is the most important, least understood, and most neglected of all cutting tools. You gonnah have to read about Mr. Joseph Mazoff this man is still among us, what insight! https://www.newmantools.com/machines/drillpoint.html JUST CLICK ON IT, IT'LL WORK

So why is a normal jobbers drill ground at 118° included angle?

I studied the why because I had to do the work You wanna hear my favorite story? Anyhow I had to find out how it was done. Apparently I was correct when 15-16 saying by the time I figure this out I will be just about dead. Gee, These guys were rally smart...

I just machinist toolmaker and can be impressed by brilliance. I was never and will never be smart. But I always got to use all the Morse, and Jaycobs , and Brown&Sharpe tools so I figure I am privileged. https://www.flickr.com/photos/nbwm/sets/72157612474032637/

It is called a twist drill, NOTa bit bits are for wood and puters Must study now but ............................... April 7, 1863 A fleet of 9 Union ironclads under the command of Samuel Dupont sailed into Charleston Harbor and attacked Fort Moultrie and Fort Sumter. Sumter is visibly damaged...

and how did all this begin? \ The twist drill bit was invented by Steven A. Morse who received U.S. Patent 38119 for his invention 'Improvements of Drill-Bits' in 1863. The original method of manufacture was to cut two grooves in opposite sides of a round bar, then to twist the bar to produce...

I seldom drill a hole without using a combination drill and countersink to spot it. It can assist with getting thru a "hot rolled" layer of crap too. A twist drill properly used will have a nice chip coming off both sides. My can of drilling tapping juice that the contractors left in 1981 is...

Do not use dull twist drills. Many metals will harden right in front of the dull drill producing the heat. It is not good to just push harder as in the end that will slow the job down and cost more $. This is about plow steel, 4140 but does apply here to answer questions.

This explains https://www.instructables.com/id/How-to-Sharpen-Used-and-Dull-Drill-Bits-By-Hand/ A drill doctor will sharpen up to 3/4" twist drills and create a chisel point if desired. After 55 years of sharpening by hand I bought a Drill Doctor 750EX as I have no longer access to my machine...

This is moved from another post where it didn't belong for future searches...... "my steel material order" Just drilling 5/8" holes thru 1/4" and 5/16" steel. What flavor steels are ordered? Is it 1018 or what is it your going to use? Is it steel referred to as A572 grade 55? Are you drilling...

still figuring how to answer this, multiple variable