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How Does a Cordless Drill Work?

Details: Category: Tungsten Information; Published on Wednesday, 11 September 2013 14:42; Hits: 1947

Introduction

Cordless drills are versatile, durable tools that can be found on construction sites, in garages and shops everywhere. One of the things that makes cordless drills so popular is that they can be taken almost anywhere. Just make sure that you have a fully charged battery and spare if you plan on working late. Cordless drills have almost (but not completely) replaced the old corded models.

The Power Supply

The most common power pack in a cordless drill--or even most cordless tools for that matter is the nickel cadmium (NiCd) battery. A battery is generally made up of two dissimilar metals (in this case nickel oxide hydroxide and cadmium) in an electrolyte ("battery acid"). In a battery, the chemical reaction between the two metals and the electrolyte cause electrons to flow from one side to the other.

In a cordless drill, the NiCd battery supplies current to a small DC motor which does the work of the drill.

The Work Horse

In any electric motor, there will be an armature (also called a rotor), a commutator, brushes, a permanent magnet and an axle. When direct current is applied to a DC motor, it creates an electromagnetic field in the windings of the armature. The difference in magnetic forces between the armature and the permanent magnet cause the armature to turn. As the armature turns, the commutator acts as a switch that reverses the current in the armature (and the brush connects the commutator to the current). This reversal of current keeps the armature turning.

The armature turns the axle and in a cordless drill the axle turns a transmission. The transmission has several gears that turn the spindle that does the actual drilling action.

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Uses of Drill Bits

Details: Category: Tungsten Information; Published on Wednesday, 11 September 2013 14:39; Hits: 1909

The electric drill is one of the most useful common tools in the handyman's arsenal. The wide variety of available drill bits allows an almost endless number of uses. Different bits serve different purposes. Uses for drill bits range from making tiny holes in wood to drilling large ones in cement; you need to match the type of drill bit to its intended purpose.

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Tungsten Carbide Instructions

Details: Category: Tungsten Information; Published on Wednesday, 11 September 2013 14:35; Hits: 1769

1

Determine if your tool needs sharpening. One easy way to decide if your tool is becoming dull is to see if it reflects light well. Shine is an indication of wear. You can also gently scrape a fingernail on a blade and see if it shaves off a sliver; if it does not, the blade is dull. Touch is not necessarily a good way to determine if a blade is sharp, as a dull carbide tool may still feel sharp.

2

Find a professional sharpening service. Sharpening carbide is not recommended for non-professionals, as it requires skill and specific sharpening machinery. Imprecise sharpening can ruin a tool, and a professional can restore a blade to like-new condition.

3

If you are interested in learning how to sharpen blades yourself, it is recommended that you locate a teacher.

4

Carbide tools require diamond for sharpening, due to their hardness. Wet grinding using an abrasive wheel on an automatic grinder is a very precise method of sharpening. It is also possible to sharpen a tool by using a diamond lap, but this is very imprecise and time-consuming.

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How to Sharpen a Step Drill

Details: Category: Tungsten Information; Published on Wednesday, 11 September 2013 14:37; Hits: 1925

A step drill is a graduated drill used to make holes in thick metal sheets. The first step on the drill creates a rather small hole but each subsequent step gradually enlarges it. Step drills can be difficult to sharpen but if the bit can be removed from the drill then there are a few methods that may work.

Instructions

1

Grind the first step like you would any other drill bit. Put the drill in a clamp that exposes only the first step. Run the edge along the grinding wheel in short, quick motions until the bit looks sharp enough for your needs.

2

Move the clamp lower on the bit so that 20 mm of the second step are exposed.

3

Adjust the clearance angle on the grinding machine enough to accommodate the larger step.

4

Position the edge of the second step against the right corner of the grinding wheel. Grind the drill while pivoting the bit up and down along an axis. If your drill has more than two steps, repeat until finished.

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How to Sharpen Tungsten Carbide

Details: Category: Tungsten Information; Published on Wednesday, 11 September 2013 14:33; Hits: 1756

Carbide is a word that refers to a variety of carbon compounds. While there are several different types of carbide, tungsten carbide is the type most commonly used for cutting or drilling tools; it is very hard, relatively inexpensive, and will retain a sharp edge for a long time. While tungsten carbide is noted for its remarkable durability, a tungsten carbide tool may need occasional sharpening if it is used regularly.

Instructions

1

Determine if your tool needs sharpening. One easy way to decide if your tool is becoming dull is to see if it reflects light well. Shine is an indication of wear. You can also gently scrape a fingernail on a blade and see if it shaves off a sliver; if it does not, the blade is dull. Touch is not necessarily a good way to determine if a blade is sharp, as a dull carbide tool may still feel sharp.

2

Find a professional sharpening service. Sharpening carbide is not recommended for non-professionals, as it requires skill and specific sharpening machinery. Imprecise sharpening can ruin a tool, and a professional can restore a blade to like-new condition.

3

If you are interested in learning how to sharpen blades yourself, it is recommended that you locate a teacher.

4

Carbide tools require diamond for sharpening, due to their hardness. Wet grinding using an abrasive wheel on an automatic grinder is a very precise method of sharpening. It is also possible to sharpen a tool by using a diamond lap, but this is very imprecise and time-consuming.

Tungsten Manufacturer & Supplier: Chinatungsten Online - http://www.chinatungsten.com
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email: sales@chinatungsten.com
Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
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