Applies to: Z4

Exchanging the collet chuck of the blank holder and the fixing screw

How do I exchange the collet chuck of the blank holder? How do I exchange the fixing screw of the collet chuck in the blank holder?

Repair kit overview

Item 240210: 1 x Blank holder collet chuck; 3 x Fixing screw for the collet chuck of the blank holder

Item 248620: 3 x Fixing screw for the collet chuck of the blank holder

Preparing the exchange

  1. Beside the vhf service trolley case, have the following items readily available:
    • Block holder service set
    • Collet chuck grease
  2. Switch on the machine at the main power switch.
  3. Open the working chamber door.

Exchanging the blank holder collet chuck and fixing screw

There are 2 cases:

  • The fixing screw is worn, but the collet chuck is still in good conditionIn this case, remove the collet chuck and reinsert it with a new fixing screw.
  • The collet chuck is wornIn this case, exchange the collet chuck with a spare part with a new fixing screw.
  • When you install a spare collet chuck, always use a new fixing screw that was delivered with the spare part.
NOTICE

Damaging of the block holder when using the wrong torque screwdriver or performing the maintenance with the machine switched off

If you use a torque screwdriver other than the one included in the scope of delivery, or if you perform the maintenance with the machine switched off, the block holder can get damaged.

  • Ensure that the machine is switched on during the entire duration of the repair.
  • Only use the provided torque screwdriver.
  • Ensure that you apply a maximum torque of 1.8 Nm.
  1. Insert the insert of the torque wrench into the collet chuck and hold it in place.
  2. Put the torque wrench on the insert and unscrew the screw by turning the torque wrench.

    3.  

  3. Remove the collet chuck and the screw from the blank holder. Dispose of the screw.

    4.  

  4. Clean the inner cone of the blank holder with the cleaning cone of the service set.
    • You have successfully removed the collet chuck of the blank holder.

You can install either the spare collet chuck or the existing collet chuck, if it is not worn.

  1. When you install a spare collet chuck, always use a new fixing screw that was delivered with the spare part.
  2. If you want to continue to use the existing collet chuck, clean and grease this collet chuck as described in the machine’s operating instructions.
  3. Push the collet chuck including the new fixing screw into the blank holder as far as you can.
  4. Twist the collet chuck until it snaps in place and is properly seated. Depending on the position you may need to turn the collet chuck up to 360°.

    5.  

  5. Insert the insert of the torque wrench into the collet chuck and hold it in place.
  6. Put the torque wrench on the bit and secure the screw by turning the torque wrench.

    7.  

    • You have successfully installed the collet chuck of the blank holder.