Operating Speeds for Accessories

Electronic Feedback Circuitry (EFC)

Your tool is equipped with a internal electronic feedback system that provides a "soft start", which will reduce the stresses that occur from a high torque start. The system also helps to keep the pre- selected rotating speed virtually constant between no-load and load conditions.

Set the speed indicator to fit the job; to achieve the best job results when working with different mate- rials, the speed of the Rotary Tool should be regu- lated. Model 398 Rotary Tool has an integral speed control.

!An external speed control CAUTION should never be used with this

tool.

To select the right speed for each job, use a practice piece of material. Vary speed to find the best speed for the accessory you are using and the job to be done.

NOTE: Speed is affected by voltage changes. A reduced incoming voltage will slow the RPM of the tool, especially at the lowest setting. If your tool appears to be running slowly increase the speed setting accordingly.

Digital Speed Selector Switch

Your rotary tool features a digital speed selector switch which displays an L.C.D. reading of the tool’s RPM. The speed can be selected from 5,000 RPM to 35,000 RPM in 1,000 RPM increments by simply depressing the positive or negative buttons on the switch.

TO TURN TOOL "ON": slide ON/OFF switch to the "ON" position.

TO TURN TOOL "OFF": slide ON/OFF switch to the "OFF" position.

TO INCREASE SPEED: depress button with + sign.

TO DECREASE SPEED: depress button with - sign.

Needs for Slower Speeds

Certain materials, however, (some plastics, for ex- ample) require a relatively slow speed because at high speed the friction of the accessory generates heat and causes the plastic to melt.

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 delicate projects as “eggery” work, 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, routing, shaping, cutting dadoes or rabbets in wood.

Hardwoods, metals and glass require high speed operation, and drilling should also be done at high speeds.

The point to remember is this: You can do the great majority of work at its regular speed of 35,000 RPM. But for certain materials and types of work, you need slower speeds — which is the reason the variable speed models were developed.

To aid you in determining the optimum operational speed for different materials and different accessories, we have constructed a series of tables that appear on page 13, 14, and 15. 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 happens 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 slightly to get the optimum working speed.

Some rules of thumb in regard to speed:

1.Plastic and materials that melt at low temperatures should be cut at low speeds.

2.Polishing, buffing and cleaning with a wire brush must be done at speeds below 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 top speed if using tungsten carbide accessory, but at slower speeds if using high speed steel cutters. 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.

Increasing the pressure on the tool is not the answer when it is not cutting as you think it should. Perhaps you should be using a different cutter, and perhaps an adjustment in speed would solve the problem. But leaning on the tool seldom helps.

Use only Dremel Tested, High Performance Accessories.

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Dremel 398 Operating Speeds for Accessories, Electronic Feedback Circuitry EFC, Digital Speed Selector Switch, Tool

398 specifications

The Dremel 398 is a versatile rotary tool that has been designed to cater to the needs of hobbyists and professionals alike. Known for its exceptional performance and reliability, the Dremel 398 offers a range of features and technologies that make it a top choice for various applications, from woodworking to metalworking.

One of the standout features of the Dremel 398 is its variable speed control, which allows users to adjust the tool's speed from 5,000 to 35,000 RPM. This flexibility enables precise control for detailed tasks such as engraving, sanding, and polishing, while also providing the power required for heavier applications like cutting and grinding. Users can easily select the ideal speed for their specific project, ensuring optimum results and enhancing control.

The Dremel 398 is equipped with a robust motor that delivers high performance and durability. Its ergonomic design provides comfort during extended use, reducing hand fatigue and ensuring better handling. The lightweight construction of the tool makes it easy to maneuver, even in tight spaces. Coupled with a comfortable grip, the Dremel 398 allows for prolonged usage without discomfort.

Another impressive characteristic of the Dremel 398 is its compatibility with a wide array of accessories. The tool can effortlessly accommodate various attachments, including cutting wheels, sanding drums, and engraving bits, making it an all-in-one solution for diverse projects. This adaptability expands the range of tasks users can perform, eliminating the need for multiple tools.

Dremel has incorporated advanced technologies in the 398, including the EZ Twist nose cap, which simplifies accessory changes without the need for additional tools. This feature streamlines the switching process, allowing users to focus on their projects without interruption. Additionally, the tool's built-in ventilation system prevents overheating, prolonging the lifespan of the motor during intensive tasks.

Safety is also a priority with the Dremel 398 design. The tool includes protective features such as a reinforced housing and a secure chuck mechanism, ensuring that accessories are held tightly during operation. This attention to safety ensures users can work confidently and effectively.

In summary, the Dremel 398 is a powerful and adaptable rotary tool packed with features that cater to both beginners and seasoned craftsmen. Its variable speed control, ergonomic design, compatibility with numerous accessories, and advanced safety features make it an essential addition to any workshop. Whether for precise detailing or heavy-duty tasks, the Dremel 398 delivers exceptional performance and versatility, solidifying its reputation as a go-to tool for creative projects.