Introduction
Problem description
Very occasionally the screws that secure the pivot mechanism that enables the customer to fold the NavVis VLX need to be replace because the thread has been stripped..
Scope
This procedure refers to the NavVis VLX 1/2/3
Pre-requisites
The following tools are required to the replace the screws:
Only for G9 and above: Plier, type: DIN 52556 shape C bore circlips 8-13mm.
Galvanized screws with socket head: M5x30
7mm wrench
Blue loctite
Replacement procedure (VLX 1 - G8)
Note: For VLX 1 - G8 the replacement procedure is easier, as there is no requirement remove the socket. Thus the screwholder will stay still when removing the screw. See illustration below.
1 Remove the screw
Use a 6mm wrench to hold the screwholder
Using the torque wrench from the VLX box, unscrew the screen counterclockwise,
As you unscrew, there maybe some resistance at first because of applied loctite,
You may hear a cracking sound of breaking loctite, continue to unscrew.
2 Installing the new screw
Apply blue loctite to the upper half of the screw M5x30.
Put on the washer between screw and screw holder.
Install new screw.
Caution: Do not forget the washer
Replacement procedure (VLX 1/2/3 - G9 onwards)
1 Remove circlips
Use circlips plier to remove the circlip.
Insert the 2 pins of the type C pliers into the circlip holes
Gently squeeze the pliers and the circlips can be removed.
Use type C pliers to remove the circlip.
| Be careful when removing the circlips.
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2 Remove the spring and washer
Use a finger to stop the spring from springing out.
Carefully remove the washer first, then the spring.
Now you have the the circlip / spring / washer as shown below.
3 Remove the stripped screw
Use a 7mm wrench, to hold the screw holder.
Remove the stripped screw (unscrewing may be difficult if it is damaged).
There's a normal washer between the screw and screw holder, be sure to not loosing this washer while taking out the screw.
4 Install the new screw
Use an M3x30 galvanized screw (inner hex head for the mounting).
Use galvanized screw as the stainless screw will still rust in humid conditions.
Apply blue loctite on the screw and install the new screw.
5 Reinstall spring and circlip
Reinstall the spring / washer / circlip to secure the mechanism.
Reference
FAQ
What is the problem described in the document?
The screws that secure the pivot mechanism of the NavVis VLX may occasionally need to be replaced due to stripped threads.
Which models of NavVis VLX does this procedure apply to?
This procedure applies to the NavVis VLX models 1, 2, and 3.
What tools are required to replace the screws?
The required tools include pliers (for G9 and above), galvanized screws (M5x30), a 7mm wrench, and blue loctite.
Is the replacement procedure different for VLX 1 - G8 compared to VLX 1/2/3 - G9 onwards?
Yes, the replacement procedure for VLX 1 - G8 is easier as there is no need to remove the socket.
What should be done if the screw is stripped and difficult to remove?
Use a 7mm wrench to hold the screw holder and carefully remove the stripped screw, ensuring not to lose the washer.
Do I need to apply loctite when installing the new screw?
Yes, you should apply blue loctite to the upper half of the new screw before installation.
What precautions should be taken when removing circlips?
Be careful when removing circlips, as springs and washers may pop out and could cause injury.
Can stainless screws be used for the replacement?
No, galvanized screws should be used as stainless screws can rust in humid conditions.
What is the final step after installing the new screw?
The final step is to reinstall the spring, washer, and circlip to secure the mechanism.