1 QS-Pivot

QS-Pivot bar enables you to run a 2DoF setup - two linear actuator on the back or on the front of the platform. It can be bolted to the bottom of the aluminum frame using included hardware. The adjustment range is presented in section 1.4.

1.1 Dimensions

1.2 QS-Pivot components

Included in the QS-Pivot box:

1.3 Mounting to an aluminum profile cockpit

Use all of the included hardware to mount the QS-Pivot bar according to the pictures. QS-Pivot bar is to be installed to the underside of the aluminum profile. It can be installed either on the front or back of the cockpit - depending on your setup. QS-Pivot bar can be moved closer to center of the rig to increase pitch movement but it MUST be installed to a crossbeam to increase stiffness. If there is no crossbeam in the preferred installation spot - it MUST be added.

1. Mount the installation plates to the QS-Pivot bar at a width that matches the cockpit. Mounting plates are not interchangeable because of countersunk holes - DIN 7991 bolts must sit flush inside them, when screwed in from the top.
   

   Image: pivot_bar_mounting1.png
2. Screw the QS-Pivot bar in under the cockpit using included bolts.
   

   Image: pivot_bar_mounting2.png
   Info

   Use small amount of medium strength thread locker on all bolts.

1.4 Adjustment dimensions

For adjustment dimensions refer to the illustration below:

1.5 Correct installation guidelines

It is possible that incorrect installation of 2 front actuators + QS-Pivot at the back may cause undesired cockpit behavior — during dynamic weaving of a high-downforce/high-grip vehicle, the actuators may lose contact with the actuator feet (bounce off the ground). Preventing actuator bouncing is crucial for user safety and for maintaining the durability of the motion platform's mechanical components. What hardware-related conditions increase the possibility of actuators bouncing off the cups/feet?

• Actuators mounted too close together — excessive roll motion range resulting in a worsened side to side stability
• Racing seat mounted directly over the QS-Pivot and actuators mounted too far from the user — insufficient weight over the actuators
• Front actuators + rear QS-Pivot setup - for better stability, front QS-Pivot + back actuators setup is preferred

What software-related conditions increase the possibility of actuators bouncing off the cups/feet?

• Highly dynamic weaving in vehicles with significant downforce or grip capabilities (e.g., open-wheelers, single seater hyper- or sports-cars, GT racing cars)
• Ideal tire and track conditions resulting in maximum grip
• Direct-drive steering base set to maximum force feedback, reduced damping, and increased inertia — this may cause steering wheel oscillations at high speed
• High-speed crash with the Violent Movement Suppressor effect disabled in QubicManager software

What steps must be taken to minimize the risk of actuator bouncing off the cups?

• DO NOT mount the actuators too close to each other — mount them on the side beams of the cockpit, not at the front
• Consider using included flat face profile mounting adapters to space out the actuators. Go to QS-210/QS-220 user manual.
• In high downforce/grip vehicle scenarios — reduce the Overall Gain slider value or decrease the Lateral G-force and Side Slip effects gains
• NEVER disable the Violent Movement Suppressor effect in the SFX tab by decreasing its sliders
• DO NOT mount the seat directly over or behind the QS-Pivot — this will not only reduce the risk of actuator bouncing but also improve the overall motion sensation for the user

Image: correct_pivot_2dof_installation.png

• Seat directly over the QS-Pivot - unwanted inertia Actuators in front - underloaded Too close to each other - too much roll for safe operation

• Seat moved forward - corrected weight balance Widened actuators mounting - more stable Too far away from user - underloaded

• Seat moved away from QS-Pivot - improved weight balance Actuators closer to user - more heavily loaded Added wider adapters for stabilization - info in QS-210/QS-220 user manual.