A Practical Guide to Drill Bits

Posted by cjs727 on Nov 1st, 2011 | 12 comments

When starting a project that requires drilling you should first make sure that you are using the right type of drill bit. If you use the wrong type you could damage the material you are working on. You can determine which drill bit to use based on what material you will be drilling into. Here is a practical and basic guide about drill bits and which are best suited for some of the more commonly used materials used in DIY projects.

Metal

When drilling into a non-ferrous metal, you will need to use High Speed Steel (HSS) drill bits that are made with partially ground tips. Non-ferrous metals include: aluminum, copper, zinc, brass and non-alloyed steel. If drilling into stainless steel, a different type of drill bit should be used. For this material, drill bits made of cobalt-alloyed High Speed Steel (HSS-E) or drill bits which have a titanium coating are best. They are more expensive than regular HSS drill bits but they allow for drilling without having to worry about excessive wear to the bits themselves.

Wood

When drilling into wood, brad point bits are best. Brad point drill bits have a long centering tip with two pre-cutting spurs. These spurs are used to score the wood fibers before the internal cutting edges cut them out cleanly.  Forstner drill bits, hardware drill bits or hinge cutting bits are usually used for larger diameters and there are auger bits for boring deep holes into wood.

Masonry

Drilling into brick or concrete will require the use of an impact drill or rotary hammer. If you are drilling any such material that contains perforated stones with a porous material, only rotary drilling should be preformed (without impact). This also applies when drilling into porous bricks and boarded walls. In order to drill into these materials, you will need a masonry drill bit. Masonry drill bits have tungsten-carbide tips designed to give the strength needed to penetrate the hard material and used with a rotary drill to lessen the likelihood of cracking and splitting that would happen with an impact drill.

If you are not sure which drill bit to use, don’t guess because this could have negative results. Ask someone who is knowledgeable, either by way of experience in the use of drills or those trained in the sale of such tools. Those who work at hardware stores usually have the knowledge needed and will be able to assist you with which bit is best for each type of job and material you will be working with.

Types of Electric Drills

Posted by cjs727 on Oct 21st, 2011 | 27 comments

Electric drills come in a variety of styles with different options. At times shopping for a new one can feel confusing. In order to assist you in making a Practical Purchase, this post is designed to explain the different types of electric drills available and what they are most commonly used for. Hopefully this will help you make a choice that better fits your specific needs.

Pistol Grip

A pistol grip drill is the most common type of corded drill. They are also the most versatile. The standard pistol grip has many attachments available to create a drill that can be used in most any application. You can purchase bits and attachments that will turn this drill into a sander, a small hand saw or a boring device.

Hammer Drill

A hammer drill, also called a masonry drill, is used most often along with concrete or brick. They are designed with a hammer mechanism that is able to rotate. The design of the hammer drill allows for heavier use while working on harder materials without breaking. Some types of hammer drills don’t have a drill only action while others can be used for either drilling or hammering.

The rotary style hammer drill will accelerate the bit with a piston design. A standard hammer drill uses a spinning cam instead. The rotary style drill tends to be more versatile, since it can be used as either a hammer or a spinning drill.

Drill Press

A drill press is a fixed style drill that is used on a workbench. They are most often found in workshops and are not portable. A drill press works when you clamp the material that needs to be drilled down, then you use a lever to pull the drill into the material. It takes less effort to create the holes, creates precision since the material can be fixed to the table, and can be adjusted to make angled holes. Attachments are available that will turn it into a sander, polisher, or honing machine.

Cordless Drills

Cordless drills are becoming more and more popular in household use and many professionals also have a few. A cordless drill uses a rechargeable battery pack. Depending on the jobs you plan on using the drill for, different battery voltages are available. A variety of attachments and drill bits can be added to make the drill an all in one tool.

The drawback to the cordless variety is you won’t have hours of use unless you have some backup battery packs fully charged and ready for use. The batteries self discharge after a period of time, requiring the battery pack to be recharged every day or two. A cordless drill is not designed to last forever, and needs to be replaced every several years.

 

This article contains information about electric drills gathered from Google, Wikipedia, ehow.com, doityourself.com and other sites during my research.

History and Development of Power Tools

Posted by cjs727 on Oct 8th, 2011 | 11 comments

Humans have made and used hand tools for more than 2 million years. Yet, when we look at the history and development of Power Tools, the first wasn’t invented until 1895. The earliest power tools were made by attaching motors to traditional hand carpentry tools.

Although power tools were available in the early 20th century, their use was not widespread.  The high purchase price along with their cumbersome and often unreliable nature caused most to stick with regular hand tools rather than switch to the then new power tools. The American manufacturer “Black & Decker” refined the electric drill in 1917. Later Michel and Sullivan improved their saw. Their new saw cost much less than previous models which aided in creating and increased interest among the average person.

Early power tools were, in part, responsible for the development of manufacturing as we know it today. Products made while using hand tools were often imperfect. Accuracy depended entirely on the skill level of the worker. The finished pieces, even those made by the same worker, would differ in size or shape from day to day. With large power tools, like milling machines, saws, and drill presses, precision could be determined with the machines settings. A product made on Tuesday would be the same as one made on Thursday. It finally became possible to manufacture identical, interchangeable parts, which led to mass production using assembly lines. The production of large quantities of the same product was accomplished much faster and at a reduced cost.

In 1886 Robert Bosch founded the Bosch Company in Germany where they made electrical components for the newly invented horseless carriage. The first Bosch power drill was produced in 1932. Today their collection of tool products is vast.

In 1924, the Milwaukee Electric Tool Company was founded. Known for manufacturing heavy-duty power tools, they are best known for the ‘Sawzall’ reciprocating saw. They also make over 500 different models of portable and stationary power tools including circular saws, drills, band saws, grinders and sanders. Also in 1924 the DeWalt power tool company was established in Baltimore, Maryland. Now they manufacture over 200 types of power tools worldwide.

Sears started marketing the Craftsman brand of tools in 1927, initially hand tools, though now they are one of the top-selling brands of power tools with both stationary and portable models.

The Makita Corporation introduced the cordless, battery-powered hand-held drill in1978. Within nine years they marketed a full range of cordless, professional-grade power tools. Today Makita manufactures more than 350 products.

While hand tools are limited by the strength of the person who uses them, power tools are not. Power tools, being equipped with motors or engines, far exceed human strength and can usually do a project much more quickly than a human worker possibly could.

Recent power tool improvements have concentrated on making longer-lasting batteries and more powerful motors. Some circular saws have laser pointers to aide in making straight cuts, and drills come with built-in lights to help working in dark spaces. There have also been ergonomic refinements made to the tool handles.

This article contains information gathered from Google, Wikipedia and other sites found during my research.

The Jigsaw – A Versatile Tool

Posted by cjs727 on Oct 5th, 2011 | 15 comments

The jigsaw is a versatile tool and is a very practical tool. It  is used for cutting curved designs into wood, metal and other materials. It can be utilized in more artistic ways than other saws, which usually will only cut straight lines. Although a jigsaw can be used to create cuts of various patterns and curves, making a straight line cut is quite difficult.

History

Originally jigsaws were manual hand saws, comprised of a handle attached to a small, thin blade. The first jigsaw puzzles were cut using this kind of saw. Most modern jigsaws are now made with an electric motor and a reciprocating saw blade.

A jigsaw with a bevel function on the sole plate allows cutting angles of typically up to 45 degrees relative to the normal vertical stroke for cutting miter joints.

In the past what we now usually call “scroll saws” were referred to as jigsaws.

Jigsaws are also referred to as “bayonet saws”.

The first powered jigsaw was created in 1946 by Kaufmann, an engineer. He replaced the needle on his wife’s sewing machine with a saw blade. Then in 1947 Scintilla started producing jigsaws under the name “Lesto jigsaw”. In 1954 Scintilla was acquired by Bosch and the name “Bosch” took over in 1964.

Blades

There are 2 main types of blade fittings in use today. One type uses a screw to hold the blade in place while the other has a slot in which to insert the blade and hold it.

A wide variety of blade types are available, including:

• thin blades to allow tighter curves to be cut
• push stroke cutting blades to avoid damage to the top surface.

Cut control is a problematic issue with jigsaws. The small blades are weak and not supported at the lower end. In order to get high quality cuts you should use blade rollers, which help keep the blade aligned just above the sole plate. Heavy metal sole plate saws are somewhat better than pressed steel models for their superior line control. To maneuver a jigsaw on a curved cut, it must be manually steered, not forced, to move sideways. Using fresh, sharp blades is recommended to ensure you get high quality cuts, so make sure you replace the old, worn blades often.

References

1. http://www.asktooltalk.com/articles/toolhistory
2. http://wikipedia.org
3. http://answers.com