Question 1

What is the thick copper wire for on the DREMEL 300 SERIES and should it be inserted in the center when mounting the flex shaft?

Accepted Answer

The thick copper wire on your DREMEL 300 SERIES is a crucial internal component that ensures electrical connection and contact with the motor's rotating circuit. This wire acts as a conductive bridge to power the rotating shaft and maintain electrical continuity during tool operation. It should never be bent, twisted, or damaged, as a break would compromise the motor's operation.

When mounting the flex shaft, you must absolutely not insert this copper wire into the center of the shaft, as this could irreparably damage it. The flex shaft is mounted only on the main shaft via the existing collet system, without any intervention on the internal components of the tool.

Here are the correct steps to install your flex shaft:

Unplug the tool electrically before any handling
Press the shaft lock button and turn it by hand until the stop notch engages
With the button engaged, loosen (do not completely remove) the collet nut using the provided wrench
Insert the flex shaft rod fully into the collet, ensuring that the copper wire remains visible and intact inside
Hand-tighten the collet nut until the rod is securely held

Important: Never force the copper wire during mounting. If it obstructs or if you doubt the correct positioning, refer to the specific instructions for your flex shaft or contact Dremel service. Do not attempt to move this wire or make internal adjustments, as only a certified technician should handle the motor components.

Question 2

How to install the additional shaft on a Dremel 300 Series rotary tool?

Accepted Answer

To install the additional shaft on your Dremel 300 Series rotary tool, follow these simple steps:

Steps to install the additional shaft:

Turn off and unplug the tool: Make sure your Dremel is turned off and disconnected from any power source to ensure your safety.
Remove the current accessory: If an accessory or chuck is already mounted, unscrew it by turning it counterclockwise.
Position the additional shaft: Place the additional shaft on the tool's spindle, ensuring it is properly aligned.
Secure the shaft: Screw the additional shaft clockwise until it is tight and stable.
Check the attachment: Ensure that the additional shaft is securely attached and does not move before turning the tool back on.

This installation will allow you to use compatible additional accessories with your Dremel 300 Series for various precision tasks.

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