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Nadella circular systems
NADELLA proposes several circular railsin Multi Motion line based on the FS family of profiles and they are the main rails of cyrcular system AXNR. The rails can be used as an entire circumference, or single sectors, or joined together with straight pieces of rail in order to obtain oval or ring circuits.
The rails are steel, induction hardened on the raceways, with the same section dimensions as straight FS ... M rails. In the circuits the rails are joined together with alignment blocks that allow easy precise mounting. All the pieces of the circuit are supplied appropriately marked in order to avoid mistakes during joining.
For protection against corrosion NADELLA proposes nickel plating (option NW) for both straight and circular pieces. On request, guides can be supplied in stainless steel (NX option).
Any guide rollers of the FS family of products can be used in combination with the circular rails.
You can set up the distance between the centres of the guide rollers of a carriage with fixed guide rollers in order to obtain clearance-free running both on the straight and on the circular stretch of a circuit.
The resulting carriage will be simple and compact but in the passage from the straight stretch to the circular one (andvice versa), when two guide rollers are engaged on the straight portion and two on the circular one, there will be clearance between the carriage and the rail. The extent of the clearance depends on the dimensions of the rail, of the roller guides and of the carriage. Because of this clearance it is not possible to have an accurate positioning of the carriage during the passage between straight and circular stretch and therefore, in fast application, there will be vibration, noise and overload of the roller guides.
This kind of carriages, with fixed guide rollers, can be used only for a single specific radius throughout the circuit.
The contraindications for the carriage with guide rollers in fixed positions can be resolved by using the steering carriage. Guide rollers are mounted in pairs on steering arms that are free to rotate in order to always be transversal to the rail in every point of the circuit. The carriage won’t have clearance at any point in the circuit improving transition area accuracy and reduce running noise. The studs of the steering carriage are fitted with needle bearings and seals for lubricant retention and protection. The tightening of the stud is obtained by the full tightening of the nut, and guarantees the best locking.
In-depth analysis:
For more technical details, consult the LINEAR GUIDE SYSTEMS section or send us a message via the CONTACTS section.