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The twist drill bit is the type produced in largest quantity today. It comprises a cutting point at the tip of a cylindrical shaft with helical flutes; the flutes act as an Archimedean screw and lift swarf out of the hole.


The twist drill bit was invented by Steven A. Morse of East Bridgewater Homme Nike Air Max 2019 Chaussures Noir Suisse , Massachusetts in original method of manufacture was to cut two grooves in opposite sides of a round bar, then to twist the bar (giving the tool its name) to produce the helical flutes. Nowadays, the drill bit is usually made by rotating the bar while moving it past a grinding wheel to cut the flutes in the same manner as cutting helical gears.


Twist drill bits range in diameter from 0.002 to 3.5 in (0.051 to 88.900 mm)[5] and can be as long as 25.5 in (650 mm).


The geometry and sharpening of the cutting edges is crucial to the performance of the bit. Small bits that become blunt are often discarded because sharpening them correctly is difficult and they are cheap to replace. For larger bits, special grinding jigs are available. A special tool grinder is available for sharpening or reshaping cutting surfaces on twist drill bits in order to optimize the bit for a particular material.


Manufacturers can produce special versions of the twist drill bit, varying the geometry and the materials used Homme Nike Air Max 270 Trainers Noir Or Suisse , to suit particular machinery and particular materials to be cut. Twist drill bits are available in the widest choice of tooling materials. However, even for industrial users, most holes are drilled with standard high speed steel bits.



A 5 mm carbide bit displaying shallow point angle.
The most common twist drill bit (sold in general hardware stores) has a point angle of 118 degrees, acceptable for use in wood, metal Homme Nike Air Max 97 Chaussures Blanche Suisse , plastic, and most other materials, although it does not perform as well as using the optimum angle for each material. In most materials it does not tend to wander or dig in.


A more aggressive angle, such as 90 degrees, is suited for very soft plastics and other materials; it would wear rapidly in hard materials. Such a bit is generally self-starting and can cut very quickly. A shallower angle Homme Nike Air Max TN Chaussures Rouge Blanche Suisse , such as 150 degrees, is suited for drilling steels and other tougher materials. This style of bit requires a starter hole, but does not bind or suffer premature wear so long as a suitable feed rate is used.


Drill bits with no point angle are used in situations where a blind, flat-bottomed hole is required. These bits are very sensitive to changes in lip angle, and even a slight change can result in an inappropriately fast cutting drill bit that will suffer premature wear.


Long series drill bits are unusually long twist drill bits. However Homme Nike Air Max TN Chaussures Noir Blanche Suisse , they are not the best tool for routinely drilling deep holes, as they require frequent withdrawal to clear the flutes of swarf and to prevent breakage of the bit. Instead, gun drill bits are preferred for deep hole drilling.

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Are You a Competitor or a Collaborator? Business Articles | April 16, 2012
When I was growing up as a child and adolescent I was pretty competitive. I was a gymnast, a swimmer and snow skier and water skier. We were in teams of course Homme Nike Air Max2 Light OG Chaussures Blanche Suisse , but individually we were competitive. A...


When I was growing up as a child and adolescent I was pretty competitive. I was a gymnast, a swimmer and snow skier and water skier. We were in teams of course, but individually we were competitive. As a team we collaborated.


My own daughters grew up the same way with soccer, tennis, swim team and a variety of other team sports.


None of us is cut throat of course Homme Nike Air Max2 Light OG Noir Suisse , but we like to win. I still like to win!


This is where how we live our lives and how we run our businesses take a different path.


One of the things I love about being a coach is the idea and belief system around collaboration. It just makes business life so much more fun and actually much more successful.


Collaboration means team work, partnerships and cooperation. Competition means rivalry, a contest, or opposition. They each have their place.


I can't imagine where my business would be if I didn't have other people to collaborate with. I believe I would feel really isolated and alone. I know my business wouldn't be where it is today without collaboration.


The idea of competing with all the other coaches out there, especially those in a similar niche Nike Air Vapormax Sandal Marine Multi-Color Suisse , just doesn't set right with me. It just would feel wrong.


You all know, there is no truly new information out there. You can find anything you want on Google. It's free. The difference is you can take what you learn, make it your own, and put it out to the world.


Niche is a big topic of mine. I have taught many teleseminars and Virtual Retreat Days on Niche. Well, that is not exactly original! I know many people who focus on Niche and we all present it in different ways in our own voice. The basics may be the same but the personalization is what makes it sing.


Look at all the Telesummits you see in your inbox these days. They have become very popular in the last few years or so. And what makes them work so successfully? Collaboration. Those speakers aren't competing with each other. They are collaborating with each other.


They are sharing their knowledge about various topics they are an expert in. They are not the only expert in the world on that particular topic. Of course not. But each speaker has their own way of presenting the topic that suits their own personality and experience.


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