7 MINIRAIL Product Overview MINIRAIL are highly accurate miniature profiled linear guideways with ball bearings. Their precision, robustness, innovative design and strength are second to none. The range includes the standard rail widths of 7, 9, 12 and 15 as well as wider widths of 14, 18, 24 and 42. The carriages are available in four lengths: MNNS (short), MNN (standard), MNNL (long) and MNNXL (extra long).
7 7.1 MINIRAIL Product Overview Product Characteristics 7.1.1 Carriage Interchangeability Because the carriages are made to precisely the same size, they can be switched for other carriages at will (carriage uniformity system). This simplifies storage and maintenance considerably. Note: The MINISCALE PLUS carriages and guideways are always matched to each other and are therefore delivered as a set (carriage mounted on rails) - (see chapter 18.1). Carriage uniformity system LUBE-S 7.1.
7 MINIRAIL Product Overview 7.1.4 Speed and Acceleration The innovative embedding of ball recirculation in the carriage allows speeds of up to 5 m/s and accelerations of up to 300 m/s2. Enlargement of ball recirculation in the carriages 7.1.5 High Load Capacities The Gothic arc profile of the guideway tracks allows high load capacities. Gothic arc profile of the guideway tracks 7.1.6 Simple Installation and Maintenance Retaining wire holding the balls in place 7.1.
7 MINIRAIL Product Overview 7.1.8 Sophisticated Lubrication Concept MINIRAIL are delivered unlubricated as standard, allowing you to decide on the optimal lubrication for the respective application (see chapter 7.2.12 «Lubricating MINIRAIL»). Each wiper on the carriages features two lubrication holes so that the left and right ball recirculation pathways can be lubricated with oil separately.
7 MINIRAIL Product Overview The carriages are fitted with profiled wipers as standard. They are snap-fitted into place and can therefore be easily replaced. Alternative variants (for example low-friction or clearance wipers) are described in chapter 9.2. Detachable wipers In order to prevent the accumulation of dirt, the attachment holes in the guideways can be sealed with plastic plugs (see chapter 9.1). 7.
7 MINIRAIL Product Overview 7.2 Technical Information and Alternative Variants 7.2.1 MINIRAIL Performance Parameters Max. acceleration 300 m/s2 Max. speed 5 m/s Preload classes V0 light preload up to 0.01 C (C = dynamic load capacity) V1 Preload 0 to 0.
MINIRAIL Product Overview 7.2.3 Accuracy Classes MINIRAIL carriages and guide rails are made to a high precision independently of each other. The carriages are interchangeable. This means that any carriage of the same size and accuracy class can be used on the guide rails without influencing the preload class. MINISCALE PLUS carriages and guide rails are also made to a high precision.
7 MINIRAIL Product Overview 7.2.4 Running Accuracy In terms of tolerances, the running of the carriage on a guideway can take on either a linear or wave-like shape. The maximum permissible deviation is limited by the accuracy class of the guideway. As shown on the following diagram, the tolerance is determined by the rail length and by accuracy class G1 or G3. 18.0 G3 Running accuracy ∆ (μm) 16.0 14.0 12.0 10.0 8.0 6.0 G1 4.0 2.
MINIRAIL Product Overview 7.2.6 Push Force The push force of the carriage is influenced by the preload class, the lubricant and the wipers used. The carriages can be delivered with a defined push force on request (see chapter 8.3). 7.2.7 Friction and Smoothness SCHNEEBERGER places high emphasis on running smoothness during the manufacturing process. Transitions, run-ins and run-outs and the quality of the plastics are given top priority.
7 MINIRAIL Product Overview 7.2.9 Rail Length and Hole Spacings Sizes L4 L5 and L10 Rail lengths L3 … … max. 7 15 5 40, 55, 70, 85 … …1000 9 20 7.
MINIRAIL Product Overview Position tolerance of the attachment holes and tolerances of the rail length L3 L4 n t = rail length in mm = hole spacing in mm = number of attachment holes = position tolerance in mm L3 ≤ 300 mm L3 > 300 mm Position tolerance t of the attachment hole 0.3 0.001 • Xn Tolerance of the rail length L3 ±0.3 ±0.001 • L3 7.
MINIRAIL Product Overview 7.2.
7 MINIRAIL Product Overview MNN MNNS N L1 L MNNXL N L1 L N N L MNNL L2 L2 L C/C0 C/C0 MQ/M0Q ML/M0L C/C0 ML/M0L 58.7 25 - 73.7 40 20 55.7 70.
MINIRAIL Product Overview 7.2.
J MINIRAIL Product Overview L4 L10 N o MNNL L8 N m1 MNN L1 L L1 L C/C0 C/C0 MQ/M0Q ML/M0L C/C0 ML/M0L A B B1 B2 J J1 L L1 L2 L4 L5/L10 L6 L8 N e f1 f2 g g2 m1 o System height System width Rail width Distance between reference surfaces Carriage height Rail height Carriage length with wipers Longitudinal spacing of attachment holes Longitudinal spacing of attachment holes Spacing of attachment holes Position of first and last attachment hole Carriage length (steel body) Lateral attachment hole
7 MINIRAIL Product Overview 7.2.12 Lubrication General Choice of lubricant is an important consideration and must therefore be defined during the development phase of the machine or application. From experience, choosing the lubricant after the design is finalized leads to significant difficulties later on. A carefully thought out lubrication concept is therefore a feature of a state-of-the-art and well-planned design.
8 8.1 MINIRAIL Options LUBE-S (LS) Long-term Lubrication LUBE-S All types of MNN MINIRAIL carriages can be ordered with optional LUBE-S lubricant. Other carriage types available on request. The ingenious long-term lubrication LUBE-S is a lubricant reservoir. It applies the lubricant externally in all orientations directly to the ball recirculation tracks by means of the capillary effect. LUBE-S is integrated into the inside of the carriage and lubricates all ball bearings that are directly under load.
8 8.2 MINIRAIL Options Multi-part Guideways for MINIRAIL (ZG) If the desired total length of the guideway is longer than the maximum length listed in the catalogue, individual guideways can be joined together with precision butt joints. For this configuration, the ends of the guideways are precision ground. The offset between the individual guideways should not exceed 0.002 mm. Take note of the numbered guideways at the butt joints during installation.
8 8.5 MINIRAIL Options Customer-specific Lubrication (KB) The fundamentals of lubrication are described in chapter 12. Special lubricants are used for specific purposes. For example lubricants for use with vacuums, different temperatures, high speeds, heavy loads or high stroke frequencies. SCHNEEBERGER can supply the guideways with the appropriate lubricant for all of these applications. Cleaned and Vacuum-packed (US) Guideways operated in a vacuum must be cleaned and packaged accordingly.
9 MINIRAIL Accessories 9.1 Plastic Plugs (MNK) Plastic plugs in the guideway attachment holes prevent accumulations of dirt. Rail length Plastic plugs for sealing the attachment holes Plastic plugs The plastic plugs can be used with the following types of screws Type DIN 7984 DIN 7380 7 MNK 4 - x 9 MNK 6 - x 12 MNK 6 x x 15 MNK 6 x x 14 MNK 6 - x 18 MNK 6 x x 24 MNK 8 x x 42 MNK 8 x x 9.2 Wipers (AS, AL and OA) 9.2.
