Vertical Lift Gas Strut Force Calculator
Use this calculator to determine the approximate force required for gas struts to lift an object vertically, such as a cabinet door or a bed frame lid. This calculation helps ensure you select struts with adequate power to support and lift your application.
Enter the total weight of the object (e.g., lid, door) you want to lift.
Measure the horizontal distance from the pivot point (hinge) to the object's center of gravity.
Measure the horizontal distance from the pivot point (hinge) to where the gas strut will attach to the object.
The maximum angle the object will open. While not directly used in the force calculation, it's important for strut length selection.
Specify how many gas struts will be used (typically 1 or 2).
Calculation Result:
Understanding Vertical Lift Gas Struts
Gas struts, also known as gas springs or gas shocks, are self-contained, hydro-pneumatic devices that provide controlled motion and support. They consist of a cylinder, a piston rod, and compressed nitrogen gas, often with a small amount of oil for damping. In vertical lift applications, they are commonly used to assist in opening and holding open heavy lids, doors, or panels, making them feel lighter and preventing them from slamming shut.
How Gas Struts Work for Vertical Lift
When a gas strut is compressed, the nitrogen gas inside is further compressed, increasing the pressure and thus the force exerted by the strut. When the strut extends, this stored energy is released, providing an assisting force. For vertical lift, the strut's force counteracts the weight of the object, making it easier to lift and holding it in an open position.
The key to selecting the correct gas strut lies in calculating the required force. Too little force, and the object won't stay open or will be difficult to lift. Too much force, and the object might spring open too quickly or be difficult to close.
Key Factors in Calculating Strut Force
- Weight of Object (kg): This is the most critical factor. The heavier the object, the more force is required to lift and support it.
- Distance from Hinge to Center of Gravity (mm): The center of gravity (CG) is the point where the entire weight of the object appears to act. The further the CG is from the hinge, the greater the torque (rotational force) the strut needs to overcome.
- Distance from Hinge to Strut Mount Point (mm): This is the lever arm for the gas strut. The further the strut is mounted from the hinge, the less force it needs to exert to create the same amount of torque.
- Number of Struts: If you use two struts, the required force is distributed between them, meaning each individual strut needs less force.
- Maximum Opening Angle (degrees): While not directly used in this simplified force calculation, the opening angle is crucial for determining the correct extended and compressed lengths of the gas strut.
Using the Calculator
To use this calculator effectively, follow these steps:
- Measure the Weight: Accurately weigh the object you intend to lift.
- Locate the Center of Gravity: For a uniformly shaped object, the CG is often at its geometric center. For irregular shapes, you might need to balance it to find its CG.
- Determine Strut Mounting Points: Decide where on the object and the frame the strut will be mounted. The distance from the hinge to the strut's attachment point on the object is crucial.
- Input Values: Enter your measurements into the respective fields in millimeters (mm) and kilograms (kg).
- Calculate: Click the "Calculate Required Strut Force" button.
Example Scenario: Lifting a Heavy Cabinet Door
Imagine you have a heavy wooden cabinet door that opens upwards. Let's use the calculator with some realistic numbers:
- Weight of Object: 10 kg
- Distance from Hinge to Center of Gravity: 300 mm
- Distance from Hinge to Strut Mount Point: 200 mm
- Maximum Opening Angle: 90 degrees
- Number of Struts: 2
Based on these inputs, the calculator would determine that each strut needs to provide approximately 73.6 Newtons (N) of force. When purchasing, you would look for gas struts rated at or slightly above this force (e.g., 75N or 80N) to ensure smooth and reliable operation.
Important Considerations
- Friction: This calculator provides a theoretical force. Real-world applications may require slightly more force due to friction in hinges and strut mounts.
- Strut Angle: The effective force of a strut changes with its angle relative to the lever arm. This calculator assumes an optimal mounting for initial lift. For precise engineering, more complex calculations involving strut geometry are needed.
- Damping: Gas struts also provide damping, which controls the speed of opening and closing. This calculation focuses purely on force.
- Safety Factor: It's often advisable to choose a strut with a slightly higher force rating than the calculated minimum to account for variations and ensure longevity.
By using this calculator, you can make an informed decision when selecting gas struts for your vertical lift projects, ensuring safety, functionality, and ease of use.