Bosch Power Tools 275T6, 285T6, 395T6 Operating Speeds, Needs for Slower Speeds, Speed Range

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Operating Speeds

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. Only a full wave output speed control such as the Dremel Model 221 should be used with the 275T6 Rotary 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. The tool may not start at switch position #1 in those areas where outlet voltage is less than 120 volts. Simply move the switch lever to a higher position to begin operation.

There are three basic types of Rotary Tools: single speed, two-speed and variable speed models.

On the single speed model, there is an ON-OFF switch. When the switch is on, the tool runs at 35,000 RPM.

On the two-speed model, there is a LO and HI switch. When the switch indicator is on the low setting, the tool runs at about 15,000 RPM. When the switch indicator is on the high setting, the tool runs at about 35,000 RPM.

On the variable speed model, there are switch setting indicators marked with a line. Slide to the number on the housing to select the operating speed needed from 5,000 – 35,000 RPM. You can refer to the charts on page 24, 25, and 26 to determine the proper speed, based on the material being worked and the type of accessory being used. These charts enable you to select both the correct accessory and the optimum speed at a glance.

If you have a single-speed or two-speed model, you will be able to use many accessories to do a wide assortment of jobs. For the majority of applications, all models of the Rotary Tool should be used at top speed.

Needs for Slower Speeds

Certain materials, however, (some plastics and precious metals, for example) 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 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.) No greater than speed setting 4 for the model 395-T6.

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 speed of Rotary Tool is controlled by setting this indicator on the housing.

The Settings for Approximate Revolutions Per Min- ute Rotary Tool Variable Speed Model 395T6.

Switch Setting	Speed Range
2	5,000	– 8,000	RPM
4*	9,000	– 11,000	RPM
6	12,000	– 17,000	RPM
8	18,000	– 24,000	RPM

1025,000 – 35,000 RPM

*395-T6 Wire Brush Setting.

Use only Dremel Tested, High Performance Accessories.

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