Tenhulzen System: Turn Plate Necessity

Understanding the Tenhulzen System and Turn Plates

The Tenhulzen system, a cornerstone in many automotive workshops, is renowned for its precision in wheel alignment. At the heart of achieving accurate alignment lies the proper use of various components, and a common question that arises is the necessity of a turn plate. This article will comprehensively explore the role of turn plates within a Tenhulzen setup, examining their function, benefits, and situations where they are indispensable for achieving optimal results.

What is a Turn Plate?

Before diving into its relevance for the Tenhulzen system, it's crucial to understand what a turn plate is. A turn plate, also known as a slip plate or turntable, is a low-friction device that allows a vehicle's wheels to rotate or pivot freely. Typically, these are circular platforms that sit on the workshop floor or are integrated into lifting equipment. They are designed to minimise resistance when a wheel is turned, allowing for accurate measurement of caster, camber, and other alignment angles. The smooth, controlled movement they facilitate is vital for the precision demanded in modern wheel alignment procedures.

The Tenhulzen System Explained

The Tenhulzen system is a sophisticated method for measuring and adjusting wheel alignment. It's characterised by its use of specialised equipment that allows for detailed and accurate readings. Unlike simpler alignment methods, Tenhulzen systems often employ laser or electronic measurement tools that provide real-time data. The system's accuracy depends heavily on the ability to manipulate the vehicle's wheels into specific positions without introducing external forces that could skew the readings. This is where components like turntables or slip plates become critically important.

Why Turn Plates are Crucial for Tenhulzen Alignment

The Tenhulzen system, with its emphasis on precise measurements, relies on the vehicle's wheels being able to move naturally and without binding. When performing alignment adjustments, particularly those involving steering axis inclination (SAI) and caster, the front wheels need to be turned to specific angles. Without a turn plate, the tyres would be in direct contact with the workshop floor, creating significant friction. This friction would resist the smooth turning of the wheel, leading to inaccurate readings and potentially incorrect alignment adjustments. The turn plate effectively isolates the wheel from the friction of the ground, allowing the alignment equipment to accurately capture the true angles.

Key Benefits of Using Turn Plates with Tenhulzen:

• Enhanced Accuracy: By minimising friction, turn plates ensure that the measurements taken by the Tenhulzen system are as precise as possible. This is paramount for correct steering, handling, and tyre wear.
• Reduced Tyre Wear: During the alignment process, if wheels are forced to turn on a high-friction surface, it can lead to unnecessary scrubbing and wear on the tyres. Turn plates prevent this.
• Improved Workshop Efficiency: Accurate readings from the outset mean fewer adjustments and re-checks, saving valuable time for technicians and increasing workshop throughput.
• Protection of Equipment: The smooth operation facilitated by turn plates can also reduce strain on alignment equipment, prolonging its lifespan.
• Correct Caster and SAI Measurement: These critical alignment angles are particularly sensitive to friction. Turn plates are virtually essential for their accurate determination.

When is a Turn Plate Absolutely Necessary?

For a Tenhulzen system, the use of turn plates is not merely a recommendation; it's often a fundamental requirement for achieving the system's intended precision. Specifically, when performing adjustments or measurements that involve:

• Caster Angle: This is the angle of the steering axis relative to the vehicle's suspension. Measuring it accurately requires the wheels to pivot freely.
• Steering Axis Inclination (SAI): Also known as kingpin inclination, this is the inward or outward tilt of the steering axis. Like caster, it needs a low-friction pivot point for accurate measurement.
• Turning Radius: While not always a primary adjustment, understanding turning radius often involves turning wheels to their extreme lock, where friction would be a significant factor.
• Full Range of Motion Testing: Any procedure that requires simulating the vehicle's steering movement will benefit immensely from turn plates.

Even for camber and toe adjustments, while the direct need for a turn plate might seem less pronounced, the overall accuracy of the alignment process is compromised if the suspension is not allowed to settle naturally due to binding. Therefore, for any comprehensive wheel alignment using a Tenhulzen system, turn plates are highly recommended, if not strictly mandatory, for the most critical measurements.

Alternatives and Considerations

While turn plates are the most common and effective solution, some modern alignment systems might integrate slip plates or turntables directly into their lifting platforms. These integrated systems serve the same purpose. In some very basic alignment checks, a technician might attempt to compensate for friction mentally, but this is highly unreliable and defeats the purpose of using a precision system like Tenhulzen.

It's also worth noting that the condition of the turn plates themselves is important. Worn-out or damaged turn plates can develop flat spots or increased friction, negating their benefits. Regular inspection and maintenance of turn plates are therefore essential.

Common Misconceptions

One common misconception is that if an alignment is being performed on a hydraulic lift with a roller system, turn plates are not needed. While rollers do reduce friction compared to a static floor, they primarily facilitate the removal of brake rotors and hubs. For the specific, precise movements required by advanced alignment systems like Tenhulzen, the free-pivoting action of dedicated turn plates is still superior.

Frequently Asked Questions

Q1: Can I perform a Tenhulzen alignment without turn plates?

A1: While technically possible for some basic checks, it is strongly not recommended if you aim for the precision the Tenhulzen system is designed for. Critical measurements like caster and SAI will be inaccurate.

Q2: What are the signs that my turn plates need replacing?

A2: Signs include increased resistance when turning the wheel, audible grinding noises, visible damage or flat spots on the surface, and consistently inaccurate alignment readings that don't improve with adjustments.

Q3: Are there different types of turn plates for different vehicles?

A3: Generally, turn plates are designed to accommodate a wide range of vehicle tyre sizes. However, some heavy-duty vehicles might require specific, more robust turn plates.

Q4: How do I maintain my turn plates?

A4: Keep them clean, free from debris, and lubricate the bearing surfaces according to the manufacturer's recommendations. Inspect for damage regularly.

Conclusion

In summary, for anyone utilising a Tenhulzen wheel alignment system, the inclusion of turn plates is a critical factor in achieving the accuracy and efficiency that define the system. They are not an optional accessory but rather an integral part of the process, particularly for measurements involving caster and steering axis inclination. Investing in quality turn plates and ensuring their proper maintenance will undoubtedly lead to more precise alignments, happier customers, and a more productive workshop. The smooth operation and reduced friction provided by turn plates are paramount to unlocking the full potential of your Tenhulzen system.

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