Drilling, tapping lubricant brand and product info Suggestions request

[frank8003]

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 shop diamond wheels. One may limit the metal removal, and new diamond sharpening wheels for the DD are cheap.
At 144 bucks delivered and ability to change away from 118° it is well worth it. I had nothing to sharpen my masonry carbide twist drills and it does a fine job on them also..

So one off the statements is the twist drills wear out and am going to drill a lot of holes.
Here is a small part of the explanation.

 

[frank8003]

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.
View attachment drill a hole a079542.pdf

 

[frank8003]

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 almost out. It is a nice foamy oil stuff. Can is so old the label disintegrated but I found a replacement as pictured. It does all I need to do around the house and the truck. Good stuff cheap.
For tapping I use lard from making bacon. Works real good.
Lard is pork fat
Tallow is beef or sheep fat.
Schmaltz is chicken or duck fat.
Blubber from whales is probably good too but never used any.

 

[gentrysgarage]

​Thanks Frank!

 

[frank8003]

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 the helical flutes. This gave the tool its name.

 

[frank8003]

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 but the Confederate batteries from the shore heavily damage the 9 ironclads and they are forced to withdraw. Naval occupation of the harbor is ruled out.
View attachment twist drill .pdf

See the patent date.
Some knew how to drill holes and some did NOT

 

[frank8003]

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/

 

[frank8003]

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.
https://www.davistownmuseum.org/TDMtoolInfo18_19century.html

 

[frank8003]

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

 

[frank8003]

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

View attachment Drill_Point_Geometry_nt.pdf

View attachment twist drill .pdf

 

[Kwaligura]

Second the atf.

 

[frank8003]

View attachment cleveland others and new grind 1956 US2936658.pdf
View attachment dfirst step drill US2193186.pdf
View attachment drill a hole a079542.pdf
View attachment Drill_Point_Geometry_nt.pdf
View attachment twist drill precision 1997 US5590987.pdf

 

[frank8003]

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

Nobody asked

 

[NormB]

For tap and die operations: Tap magic.

For drilling - drill press or mill or hand drill - same or WD40.

Milling: WD40 or soluble oil/water mix.

FWIW.

 

[gringeltaube]

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

Nobody asked

Because we all kept waiting for your answer...

So yes, I'm curious.... WHY?

 

[gimpyrobb]

Because we all kept waiting for your answer...

So yes, I'm curious.... WHY?

Actually, if you read the article he linked to, most of the answers are there.

 

[USAFSS-ColdWarrior]

Relative to this DRILLING thread I just added a couple of videos on HOW BITS ARE MADE to this thread: https://www.steelsoldiers.com/showt...roduction-Manufacturing&p=2212479#post2212479 SEE POST #129.

 

[gentrysgarage]

Nobody asked

Hi Frank I was thinking it was more a rhetorical question (or cliffhanger question) to be followed up with another informative post. Sorry I didn't catch it. Was super busy this weekend with a fruitless Swap Meet event. I packed the 1992 Dodge 3/4 ton long bed extended cab loaded to over the brim in the bed and cab of British preunit motorcycle parts.But Monday I got some cool tools

 

[gringeltaube]

Actually, if you read the article he linked to, most of the answers are there.

I know... but he wanted to be asked, anyway!?