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Frequently Asked Questions

Q: Are powdered metal parts as strong as wrought parts?

A: Yes. Powdered metal parts either meet or exceed wrought parts, not only in strength but also in other physical characteristics. P/M can be tailored to a specific physical or metallurgical characteristic through alloying or processing.

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Q: Can powdered metal parts hold close tolerances?

A: Yes. As a rule, the P/M process can hold closer tolerances than most of the other metal fabricating processes. If tight tolerances are required, there are secondary processes that can be performed to meet the specifications.

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Q: Are there numerous operations that have to be performed to P/M parts after they are made to ensure that they meet print requirements?

A: No. In most cases the parts are to the print after the press-sinter process. The only secondary operation may be tumbling. This is one of the reasons that P/M is used. Parts can be made near net shape without any secondary processing.

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Q: Can P/M produce high volume?

A: Yes, the P/M process is a high volume process. The majority of parts made by P/M are used in automobile manufacturing. P/M is a high volume, repeatable process.

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Q: What is a self-lubricating bearing?

A: This is a P/M bearing in which the porosity in the part is impregnated with lubricant. When in use, the bearing heats up, and the lubricant flows to the surface of the bearing. When the bearing cools down, the lubricant is drawn back into the porosity of the part.

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Q: Why choose a P/M gear over a wrought gear?

A: 1. Noise dampening- the controlled porosity in the P/M gear reduces the ringing sound when two gears mesh together.

2. A wide variety of material selections are available.

3. P/M gears are made to AGMA specifications. (American Gear Manufacturers' Association).

4. Gears can be combined with other components such as cams, ratchets, and other gears to form a single component.

5. Tools can be made to provide consistent component accuracy over long runs.

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Why NPM?
Applications and Industries
Secondary Operations
P/M Advantages
Case Studies
Truck Directions
Material Standards
Ferrous Structural Parts
Soft Magnetic Parts
Non-Ferrous Parts
Self-Lubricating Bearings