A new series of 7 flexible molded Duracon and steel racks  introduced by
Quality Transmission Components can run with standard  20 degree pressure angle
metric gears for low cost linear indexing  applications of any length. The 3
standard lengths stocked, 2000 mm,  3000 mm, and 4000 mm (78.7", 118.1" and
157.5") can be extended by  adding additional sections. They are ideal for curved,
circular or  irregular surfaces where they can fit a bend radius of as small
as  3" and still run with standard metric gears. Fitted in their  flexible
nylon guide rails they can be bent into circular shape to  function either as
internal or external gears.

The unique ability of these racks to be bent or slightly twisted make them ideal for use as serpentine drives. They are positioned with specially designed screw-down rack clamps or with a choice of 6 aluminum or steel guide rails. The standard rack sizes stocked are: 0.8, 1.0, 1.5 and 2.0 Module and Circular Pitch 5. These bright blue colored acetal and steel racks can run with a variety of plastic, brass, steel or stainless steel gears. The widths of the 7 racks stocked range from 3.8 mm to 8 mm (.150" to .315") in plastic and 10 mm (.394") in steel. Rack heights range from 3.3 mm to 7 mm (.130 mm to .276").

The light weight, self lubricating plastic racks have a high dielectric strength and are resistant to alcohol, ketones, oil, grease, gasoline and other weak acids and alkalis. Their maximum continuous working temperature is 212 degrees Fahrenheit but they can operate intermittently at temperatures as high as 300 degrees Fahrenheit.

http://www.econobelt.com/Q460/Q460cat.htm

There are over 9,000 off-the-shelf timing belt pulleys, belts, belt and roller chain tensioners and other power transmission components to our offering. These products designed for use in prototypes or for production applications are featured in our companion catalog Q460.

The 368 page catalog features Econobelt brand timing belts and pulleys in 11 different profiles: MXL, XL, L, HTD3, HTD5, HTD8, T2.5, T5, T10, AT5 and AT10. The belts are made of fiberglass-reinforced neoprene and the pulleys are made of steel, aluminum and nylon.

To download or request the Q460 Catlalog, click here.

http://www.econobelt.com/Q460/Q460cat.htm

There are over 9,000 off-the-shelf timing belt pulleys, belts, belt and roller chain tensioners and other power transmission components to our offering. These products designed for use in prototypes or for production applications are featured in our companion catalog Q460.

The 368 page catalog features Econobelt brand timing belts and pulleys in 11 different profiles: MXL, XL, L, HTD3, HTD5, HTD8, T2.5, T5, T10, AT5 and AT10. The belts are made of fiberglass-reinforced neoprene and the pulleys are made of steel, aluminum and nylon.

To request your free Q420 catalog, click here.

http://www.qtcgears.com/RFQ/

In addition to the over 3,700 metric gears detailed, this 528-page catalog contains a comprehensive technical reference section entitled "Elements of Gear Technology". The topics covered include the principles of involute gearing, gear dimension calculations, the definition of backlash, plastic gear design, elements of gear accuracy, principles of surface contact, methods of lubrication and methods for noise reduction.

The product section includes detailed specifications of the complete offering of off-the-shelf Spur gears, Helical gears, Screw gears, Ratchets & Pawls, Gear couplings, Worms & Worm Wheels (Standard & Duplex), Ring gears (Internal & External), Involute splines (Internal & External) , Racks (Straight, Helical & Flexible), Miter gears (Straight & Spiral) and Bevel gears (Straight & Spiral). These 3,700+ products are offered in sizes from module 0.5 thru module 10, in materials that include alloy steel, carbon steel, stainless steel, cast iron, aluminum bronze, brass, cast bronze, nylon, and acetal.