“The distinctiveness of step gauges lies in their substantial physical volume coupled with ultra-high precision (typically at the $0.1\mu m$ level). Compared to pin gauges or gauge blocks, their maintenance and operational requirements regarding environmental conditions and physical support are exceptionally stringent.”

I. Hard Rules Before Measurement: Environment and Thermal Equilibrium

Strict Adherence to a 20°C Constant Temperature Environment:

Due to the significant length of step gauges (typically $300\text{mm}$ to over $1000\text{mm}$), a temperature fluctuation of even $0.5^\circ\text{C}$ can cause length variations of several micrometers.

Operation: Step gauges must be placed in a constant temperature room at $20\pm 0.5^\circ\text{C}$.

Depending on the length, the soaking time (isothermal period) required is 12 to 24 hours.

Expert Tip: During measurement, the CMM probe movement speed should remain constant to avoid local heat impact on the step gauge caused by frequent acceleration.

Selection of Support Points (Airy Points):

Step gauges undergo minute bending due to gravity.

To achieve the most accurate straightness, they must be placed on specific Airy Points support bases.

Mihe Recommendation: The dedicated support frames provided with the product are irreplaceable; using random blocks for support is strictly prohibited, as it will prevent the measurement results from achieving a closed loop.

II. Operational Details During Use: Probing and Direction

Tactile Force Control:

When the CMM triggers the measurement surfaces of the step gauge, the triggering force must be extremely small and constant.

Warning: If using a manual probe, violent collisions with the measurement surfaces are strictly forbidden, as this damages the parallelism of the gauge and leads to data drift.

Multi-Dimensional Inspection Schemes:

Step gauges are not only for horizontal detection.

To fully compensate for CMM spatial errors, measurements should be conducted in horizontal (X/Y axes), vertical (Z axis), and spatial diagonal directions.

Logic Reference: Utilize the data-analysis software provided by Mihe to compare measured values with the calibration certificate data to generate deviation curves.

III. Customized Maintenance by Material (Mihe Core Advantage)

Mihe Precision’s material diversification is a core competitive strength. Maintenance strategies for different materials are as follows:

Maintenance Dimension	Steel Step Gauges	Ceramic Step Gauges
Core Challenge	High thermal expansion coefficient; extremely prone to rust.	Lower impact resistance; heavier weight.
Cleaning Essentials	Use anhydrous ethanol only; strictly avoid contact with water.	Professional cleaners may be used; acid and alkali resistant.
Anti-Rust Strategy	Extremely Critical. A light anti-rust oil must be applied to the entire unit after use, covering all measurement surfaces.	No anti-rust needed. This is a major advantage of Mihe ceramic gauges; simply dry and store after cleaning.
Storage Life	Requires regular inspection for rust spots.	Extremely high physical stability; almost no deformation due to time effects.

IV. Storage and Handling: Treat Like a Work of Art
Custom Housing:
Step gauges must be stored in the shock-proof wooden boxes or flight cases provided with the shipment.
During storage, the gauge must be separated from its support brackets to prevent permanent plastic deformation caused by long-term pressure.

Handling:
Long step gauges must be carried by two people, and they must only grip non-working surface areas.
Expert Advice: It is strictly forbidden to grab the middle section of the gauge with one hand.

V. Traceability and Calibration Management
Initial Data Entry:
Every step gauge produced by Mihe comes with a calibration certificate issued by a Feinmess Jena length measuring machine.
Before use, ensure that every “nominal length” from the certificate is entered into your measurement software.

Calibration cycle:

As the ‘primary standard’ within a company, it is recommended that step gauges be sent to a national legal metrology institute or the original manufacturer for a comprehensive calibration every 1–2 years.

If the gauge has been dropped during handling, it must be taken out of service immediately and recalibrated, even if there is no visible damage.

Website Content Strategy (Engineering Insights):

To encourage customers to choose Mihe Precision after visiting koba.de, we could add the following ‘differentiating’ section to the feeler gauge page:

‘Why is ceramic the ultimate choice for feeler gauges?’: Conduct a comparative demonstration. Simulate a workshop environment with 10% humidity to show the rusting of a steel step gauge after 30 days versus a ceramic step gauge that remains in pristine condition.

“1:1 Expert Technical Support”: Emphasise that Mihe not only supplies hardware but also provides operational guidance on CMM accuracy compensation — “We are not just a gauge manufacturer; we are your CMM accuracy diagnosticians”.