15.4 Geometric and Position Accuracy of Base Surfaces

15.4.1 Permissible Lateral Deviation E1 for MINIRAIL and MINISCALE PLUS

Lateral deviation E1 measurement diagram

Calculating Height Deviation E₁

E₁ = Q · V_vsp

E₁	=	Height deviation E₁₁ + E₁₂, unit: mm
Q	=	Guide rail spacing, unit: mm
V_vsp	=	Preload factor (see table below)

Preload Factor V_vsp

Carriage Size	Preload Class V0	Preload Class V1
7, 9, 12, 15	0.00025 Q	0.00015 Q
14, 18, 24, 42	0.00013 Q	0.00008 Q

E₁ Calculation Example

Example: Model MNN 12, Preload class V1
Spacing Q = 120 mm

Calculation: Preload factor V_vsp for model MNN 12, preload class V1 is 0.00015
0.00015 × 120 mm = 0.018 mm

Explanation: The deviation of E₁₁ and E₁₂ (= E₁) must not exceed 0.018 mm.

15.4.2 Permissible Longitudinal Deviation E2 for MINIRAIL and MINISCALE PLUS

Longitudinal deviation E2 measurement diagram

Calculating Height Deviation E₂

E₂ = K · V_vsp

E₂	=	Height deviation E₂₁ + E₂₂, unit: mm
K	=	Carriage spacing, unit: mm
V_vsp	=	Preload factor (see table below, by carriage type)

Preload Factor V_vsp (by Carriage Type)

Carriage Size	Carriage Type	Preload Factor V_vsp
7, 9, 12, 15	MNNS (Short)	0.00010 K
7, 9, 12, 15	MNN (Standard)	0.00005 K
14, 18, 24, 42	MNN (Standard)	0.00004 K
7, 9, 12, 15	MNNL (Long)	0.00004 K
14, 18, 24, 42	MNNL (Long)	0.00003 K
7, 9, 12, 15	MNNXL (Extra Long)	0.00003 K

E₂ Calculation Example

Example: Model MNNL 42
Carriage spacing K = 700 mm

Calculation: Preload factor V_vsp for model MNNL 42 is 0.00003
0.00003 × 700 mm = 0.021 mm

Explanation: The deviation of E₂₁ and E₂₂ (= E₂) must not exceed 0.021 mm.

15.4.3 Flatness E6 and E7 of Mounting Surfaces

Mounting surface flatness measurement diagram

For the flatness E6 of the guide rail surface over its entire length, it is recommended to refer to the running accuracy values of the corresponding accuracy class as described in Chapter 7.2.4.

For the flatness E7 of the carriage surface, target the values in the table below.

MINIRAIL and MINISCALE PLUS

Size	Flatness (μm)
7	3
9
12
15	4
14
18
24	5
42	5

MINISLIDE MS and MSQ

For the flatness E7 of the carriage surface, target the values in the table below.

Size	Flatness (μm)
4	2
5	2
7	3
9	3
12	4
15	4

15.4.4 Parallelism Tolerance of Reference Surfaces for MINIRAIL and MINISCALE PLUS

Reference surface parallelism tolerance measurement diagram

Non-parallel aligned guide rails generate unplanned loads over the travel length of the guideway system, subjecting the rails to additional stress. This reduces the running accuracy of the guideway and may shorten service life. Therefore, the following parallelism tolerances Δ must be observed.

Preload Class	Guide Rail Width (mm)
Preload Class	7 and 14	9 and 18	12 and 24	15 and 42
V0	Δ 0.003 mm	Δ 0.005 mm	Δ 0.008 mm	Δ 0.010 mm
V1	Δ 0.002 mm	Δ 0.003 mm	Δ 0.004 mm	Δ 0.006 mm

Important: Parallelism tolerance is critical for ensuring long-term performance and accuracy of the guideway system. Appropriate measuring tools should be used for verification during installation.