15.4 Geometric and Position Accuracy of the Base Surfaces

15.4.1 Permissible Lateral Deviation E1 for MINIRAIL and MINISCALE PLUS

Calculating height deviation E1

Calculating height deviation E₁

E₁ = Q · V_vsp

E₁	=	height deviation E_1.1 + E_1.2 in mm
Q	=	guide rail spacing in mm
V_vsp	=	preload factor (see following table)

Preload factor V_vsp

Dimension of the carriages	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

Calculation example for E₁

Example: Type MNN 12 in preload class V1
Spacing Q = 120 mm

Calculation: Type MNN 12 in preload class V1 results in a preload factor V_vsp of 0.00015
0.00015 × 120 mm = 0.018 mm

Comment: The deviations of E_1.1 and E_1.2 (= E₁) must not exceed 0.018 mm.

15.4.2 Permissible Longitudinal Deviation E2 for MINIRAIL and MINISCALE PLUS

Calculating height deviation E2

Calculating height deviation E₂

E₂ = K · V_vsp

E₂	=	height deviation in mm
K	=	carriage spacing in mm
V_vsp	=	preload factor (see following table, by carriage type)

Preload factor V_vsp (by carriage type)

Carriage dimensions	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

Calculation example for E₂

Example: Type MNNL 42
Spacing K = 700 mm

Calculation: Type MNNL 42 results in a preload factor V_vsp of 0.00003
0.00003 × 700 mm = 0.021 mm

Comment: The deviations of E₂ must not exceed 0.021 mm.

15.4.3 Flatness E6 and E7 of the Mounting Surfaces

Mounting surface flatness measurement diagram

For the flatness E6 of the guideway surface over the entire length, we recommend the running accuracy values for the corresponding accuracy class described in chapter 7.2.4.

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

MINIRAIL and MINISCALE PLUS

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

MINISLIDE MS and MSQ

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

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

15.4.4 Parallelism Tolerance of the Reference Surfaces for MINIRAIL and MINISCALE PLUS

Reference surface parallelism tolerance measurement diagram

Guideways which are not parallel-aligned generate unplanned loads over the stroke length of the guideway system, subjecting the tracks to additional stresses. This reduces the running accuracy of the guideway and can shorten service life. The following parallelism tolerances Δ must therefore be observed.

Preload class	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 0.005 mm

Important: Parallelism tolerance is critical to ensuring the long-term performance and accuracy of the guideway system. Verification with appropriate measuring tools should be carried out during installation.