Helical Gear & Cam Assembly

Designed for a leading manufacturer of dual-action electric hedge trimmers, this gear and cam assembly transfers the rotary motion of the motor into the reciprocating action of the trimmer blades. The 71-tooth, 26 diametrical pitch helical gear is compacted to 6.6 g/cc minimum "green" density and copper-infiltrated to a 7.4 g/cc typical density. It is subsequently quenched and tempered by conventional heat treatment. The 2-piece sinter-bonded cam is copper-infiltrated to a 7.35 g/cc typical density, and then quenched and tempered by conventional heat treatment methods. The cam consists of two compacted pre-forms that are assembled prior to sintering. The assembly is mechanically and metallurgically bonded during the sintering process. The sinter-bond must withstand a push-out force of 500 pounds minimum and 60 foot-pounds of torque.

• Both gear and cam were designed for powder metallurgy based on projected cost savings
• Both parts are net shape - no secondary machining
• Assembly is comprised of two sinter-bonded cams and a copper infiltrated gear
• Gear has 71-tooth, 26 diametrical pitch configuration and helical angle of 15°
• Assembly is a joint effort of two MPP plants

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