Assembly - (cont.)

Screw the flexible shaft onto the Rotary Tool housing being sure that the square end of the center core engages the square hole socket in the driver cap Figure 3.

Do not pull out center core to engage into driver cap. This could cause disengagement of center core from handpiece. If tool stops when shaft is bent, center core may be lodged in driver cap. Loosen shaft and remove core from driver cap. Then screw flexible shaft onto rotary tool housing again.

Flex-Shaft Collet Assembly

The collet assembly consists of a collet nut and collet. To change bits use the wrench and a bit. Insert the shank portion of any bit (1/8" shank recommended) through the opening in the flex-shaft hand piece to lock the shaft. With the shaft secured, use the wrench to loosen or tighten the collet nut as shown in Figure

4.With the collet nut loose, insert an accessory or bit as deeply as possible to avoid wobble during use. Retighten the collet nut.

Collet Removal and Replacement

Four different size collets to accommodate different shank sizes, are available for your flex-shaft. To install a different collet, remove the collet nut and remove the old collet. Insert the unslotted end of the collet in the hole in the end of the flex-shaft. Replace collet nut on the shaft. Always use the collet which matches the shank size of the accessory you plan to use.

Never force a larger diameter shank into a collet.

Flexible Shaft Lubrication

The flexible shaft should be lubricated after every 25- 30 hours of use. To lubricate, unscrew the flexible shaft assembly from the motor housing. Pull the center core out of the flexible shaft assembly. Wipe a very thin film of a good quality, high temperature grease on to the center core.

!To prevent damage to tool do CAUTION not over grease shaft. Too much

grease will cause the unit to overheat. Automotive wheel bearing grease should be used.

Reattach the flex-shaft to the rotary tool.

!Do not operate the flexible shaft WARNING with a sharp bend (A). This can

generate excessive heat and will reduce tool and flex- shaft life. The recommended minimum is 6" radius (B).

Contents of 225 Flex-shaft Attachment

Qty. Description

1Flex-Shaft Assembly (42" long)

1Driver Cap

FIG. 1

 

 

HOUSING

 

 

 

CAP

 

 

 

 

COLLET

NUT

 

DRIVER

FIG. 2

CAP

MOTOR

SHAFT

 

FLEXIBLE

 

SHAFT

FIG. 3

 

DRIVER CAP

COLLET (inside)

FIG. 4

COLLET

NUT

BIT

6" RADIUS

A.B.

Page 8

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Dremel 398 owner manual Flex-Shaft Collet Assembly, Collet Removal and Replacement, Flexible Shaft Lubrication, Radius
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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.
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