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The term ‘Rotary and dremel tools’ is used to cover a wide array of implements that have varied applications. A typical rotary tool can be attached with different bits, each one performing a different function through high-speed rotational motion. The dremel is also a versatile rotary tool having a thick cylindrical body that can be wielded easily by the user for better precision. Rotary tools can be used for sanding, grinding, drilling, cutting, metal deburring and shaping, grout eradication, ceramic tile chiseling, etching, and engraving. While this tool is mostly used by skilled workmen such as carpenters, masons, and plumbers, it is also popular with ‘home workshop’ enthusiasts. Some of the domestic applications of rotary tools include scraping away old paint and varnish from wooden furniture, removing window pane glazing, and slicing through plumbing pipes. The cutting and shaping functionality of these tools is also used in art and craft work. The tool can also be used to sharpen chain saws.
Features and working of a rotary / dremel tool The rotary tool works through the rotational motion of the bit which is the only component that actually comes in contact with the work surface. This bit is held firmly at the tip of the tool in a collet. The collet is a collar-like device that encircles the bit and can be tightened around the bit, enhancing the precision of the tool. The collet sizes range from around 1/4 to 1/8 inch. The collet with a shaft-lock button is designed to enable quick changing of the bits. The rotation of the bit is generated by a motorized mechanism that is powered either through electricity or compressed air. Those tools powered through compressed air, called pneumatic tools, have the tool connected to pressurized air filled tanks. When the tool is started, this air is allowed to flow towards the front of the tool under high pressure, which causes the tool bit to rotate. The tools which work on electricity are either corded or cordless. Corded rotary tools have a power cord which needs to be connected to a power source. Thus, usage of this type of tool requires the proximity of a power socket. Cordless rotary tools, on the other hand, have Rechargeable batteries. Thus, these rotary tools are completely portable; they can be carried around, and also used in the outdoors. In addition to spare batteries, cordless tools are shipped with a battery recharger. Rotary tools are broadly classified into two types; cut out tools and simple rotary tools. Since cutting tasks exert a greater power demand on the tool, cut out tools have more powerful motors using around 4 to 5 amps, while other basic rotary tools use approximately 1 amp. Average rotary tools have a performance of around 5,000 to 35,000 revolutions per minute (rpm). Most of the tools have a variable speed facility that enables the user to change the speed, depending on the application requirements.
Some tools have accessories that simplify and quicken the performance of certain tasks. Guided bits could be used to cut wallboard around an electric box, letter box, or any other wall touching device, without touching the box. A circle cutter enables the user to cut accurate circles in any material. A router accessory facilitates freehand routing. The tool can also be used as a drill press. A flexible shaft enhances maneuverability of the tool. Adding a small planer or saber saw attachment to a dremel, allows the tool to be used as a Reciprocating saw. What to look for in a rotary / dremel tool Most of the movable parts in the tools are rendered with ball bearings to prevent wear and tear due to friction. Further tool enhancement is ensured through replaceable motor brushes. Some tools have a metal hook with which the tool can be hung in the wall. The flexibility of a 105 degree angle in some rotary tools allows its usage in relatively inaccessible locations. A lighting attachment provides better visibility by illuminating the work area. As with any power tool, the comfort and safety factor cannot be ignored. The tool grip has an ergonomic design to enhance the comfort Level of the user and also reduce wrist strain during prolonged use. Additionally, a lockable throttle prevents the tools from starting automatically. The location of the trigger and the other controls are easily accessible even when the tool is being used. Some reputed manufacturers of the rotary / dremel tools include Grip, and Porter-Cable. Discuss this article on the forums. (0 posts)
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