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Idiomas disponibles
Needs for Slower Speeds
Certain materials, however, (some plastics and precious metals, for ex ample) require a relatively slow speed because at high speed the friction
of the accessory generates heat and may cause damage to the material.
Slow speeds (15,000 RPM or less) usually are best for polishing operations employing the felt polishing accessories. They may also be best for
working on deli cate projects as delicate wood carving and fragile model parts. All brushing applications require lower speeds to avoid wire
discharge from the holder.
Higher speeds are better for carving, cutting, shaping, cutting dadoes or rabbets in wood.
Hardwoods, metals and glass require high speed operation, and drilling should also be done at high speeds.
Many applications and accessories in our line will provide the best performance at full speed, but for certain materials, applications, and accesso-
ries, you need slower speeds, which is the reason our variable speed models are available.
To aid you in determining the optimum operational speed for different materials and different accessories, we have construct ed a series of tables.
By referring to these tables, you can discover the recommended speeds for each type of accessory. Look these tables over and become familiar
with them.
Ultimately, the best way to determine the correct speed for work on any material is to practice for a few minutes on a piece of scrap, even after
referring to the chart. You can quickly learn that a slower or faster speed is more effective just by observing what hap pens as you make a pass or
two at different speeds. When working with plastic, for example, start at a slow rate of speed and increase the speed until you observe that the
plastic is melting at the point of contact. Then reduce the speed slight ly to get the optimum working speed.
Some rules of thumb in regard to speed:
1.
Plastic and other materials that melt at low temperatures should be cut at low speeds.
2.
Polishing, buffing and cleaning with any type of bristle brush must be done at speeds not greater than 15,000 RPM to prevent damage to the
brush.
3.
Wood should be cut at high speed.
4.
Iron or steel should be cut at high speed. If a high-speed steel cutter starts to chatter — this normally means it is running too slow.
5.
Aluminum, copper alloys, lead alloys, zinc alloys and tin may be cut at various speeds, depending on the type of cutting being done. Use paraffin
or other suitable lubricant on the cutter to prevent the cut material from adhering to the cutter teeth.
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