Custom Worm Gear Set Phosphor Worm Wheel Stainless Steel Worm Machining Hobbing Ground

Nanjing Precision Engineering Co., ltd can manufacture worm gear sets, which are comprised of a worm and worm wheel, for use in a variety of industries including automotive, medical, dental, oil and gas exploration, robotics, optical and industrial automation.

Worm gear is used mostly where the power source operates at a high speed and output is at a slow speed with high torque. Worm gears are typically manufactured by hobbing with a hob or cutting tool very similar to the worm that the gear mates with. The worm may be turned, hobbed, milled, or ground. Phosphor Bronze Gear Wheel: Material: Phosphor Bronze

Process: bronze casting-cnc machining-hobbing-deburring

Stainless Steel 303 Worm: Material: Stainless Steel 303 Process: rod-cutting-cnc turning-hobbing-grinding-deburring

NJPE ADVANTAGES . Custom production according to customer request . Diameter from 15 to 300 mm, axial distances from 17 to 210 mm, module from 0.5 to 10, shaft length up to 500 mm . Material selection according to customer requirements (steel, bronze, brass or plastic) . All process steps (turning, hobbing, annealing, flank grinding, grinding, measuring) from a single source BASIC INTRODUCTION TO GEAR SETS Types of worms

1. Cylindrical or straight worm, and

2. Cone or double enveloping worm.

The cylindrical or straight worm is most commonly used. The shape of the thread is involute helicoid of pressure angle 14.5 degree for single and double threaded worms and 20 degree for triple and quadruple treaded worms. The worm threads are cut by a straight sided milling cutting having its diameter not less than the outside diameter of worm or greater than 1.25 times the outside diameter of worm.

The cone or double enveloping worm is used to some extent, but it requires extremely accurate alignment. The types of worms are showed in below Fig.

Types of Worm Gears

1. Straight face worm gear

2. Hobbed straight worm gears

3. Concave face worm gear

The straight face worm gear is like a helical gear in which the straight teeth are cut with a form cutter. Since it has only point contact with the worm thread, therefore it is used for light service.

The hobbed straight face worm gear is also used for light service but its teeth are cut with a hob, after which the outer surface is turned. The concave face worm ger is the accepted standard form and is used for all heavy service and general industrial uses.

The teeth of this gear are cut with a hob of the same pitch diameter as the mating worm to increase the contact area.

FORMULAS for PROPORTIONS of AMERICAN STANDARD FINE-PITCH WORMS and WORM WHEELS

All dimensions in inches unless otherwise indicated