Linear Guidance
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HISTORY In 1969, Joseph H. Nook Jr. founded Nook Industries, Inc., intent on becoming a global supplier of Linear Motion products. Ball screws, both rolled and ground, were the cornerstone products in the early 1970’s, putting Nook Industries on the map as a successful business and a trusted company. Through the years, Nook Industries has served as a leading manufacturer of engineered products. From the first ball screws to the latest technologies, Nook Industries strives to provide customers with high quality products and engineered solutions. Companies around the world depend on the...

MISSION Pairing traditional and proven design with the latest technology, Nook Industries manufactures products that customers value. The expansion of product lines and the development of application specific components and engineered systems have propelled Nook Industries to the forefront of the industry. Nook Industries is committed to customer satisfaction and providing high-quality, high-value products that are delivered on time at a competitive price.

Standard Profile ball Rails Nook Standard Profile Ball Rails used in guiding a CNC router. NOOK STANDARD PROFILE BALL RAILS

LINEAR GUIDANCE STANDARD PROFILE BALL RAIL STANDARD PROFILE BALL RAIL DESIGN ORDER SPECIFICATION fax FORMS nookindustries.com The specifications and data in this publication are believed to be accurate and reliable. However, it is the responsibility of the product user to determine the suitability of Nook Industries products for a specific application. While defective products will be replaced without charge if promptly returned, no liability is assumed beyond such replacement.

precision PROFILE ball RAIL Precise Linear Motion • he reference face and four grooves are ground T simultaneously by special grinding machines • Simple construction of the runner block • he rail’s high degree of straightness enhances final T installation accuracy features and benefits Equal Load Carrying Capacity in Four Directions • teel bearing balls recirculate between the rail and the runner S block and contact both surfaces at a 45° angle. Equal load can be applied bi-directionally in both horizontal and vertical axes. The Nook System is also capable of withstanding moment loads. L...

LINEAR GUIDANCE STANDARD PROFILE BALL RAIL STANDARD PROFILE BALL RAIL Smooth Operation at Both High and Low Speeds Versatile Installation • recision ground full radius ball tracks provide smooth ball P circulation and reduced friction The compact design of Nook runner blocks offers greater design flexibility and several methods of mounting compared to other linear guidance systems. Special retainers and recirculation tubes prevent balls from escaping when the runner block is removed from the rail. (remove slowly with no-load) • he unique ball recirculation design permits stable, high T...

PROFILE ball RAIL Runner Block Types Nook Precision Profile Rails are available in two designs. One design utilizes steel return tubes for ball recirculation (NH-TA, NH-TB, NH-TR) and the other utilizes a plastic end cap for ball recirculation (NH-LEA, NH-LEB, NH-LER, NH-EA, NH-EB, NH-ER, NU-ER, NU-SER). The tube type recirculation system enables the carriage to be used for higher speed applications. The plastic end cap runner block is narrower in width than the return tube style block. Depending upon the requirements of height, loads, mounting holes, etc. the users may choose from eight...

LINEAR GUIDANCE REFERENCE NUMBER SYSTEM The following numbers are used to reference the type of Nook Precision Profile Rail Systems. When placing an order, please specify the numbers by referring to the following guide. Model No. Number of runner blocks on rail One runner block = B1 Preload type Length of rail (mm) Accuracy grade Stocked accuracy is C5 Number of rails used in parallel on the same plane One rail = W1 STANDARD PROFILE BALL RAIL STANDARD PROFILE BALL RAIL Modifier list S = Standard, no aditional description required M = Modified, additional description required J =...

ACCURACY STANDARDS & RECOMMENDATIONS Nook Precision Profile Rail Systems are available in six standard classes. The selected accuracy grade should match the positioning accuracy and parallelism requirements of the machines. The grade of the Profile Rail System should be matched to the ball screw if used. ACCURACY STANDARDS Rail Accuracy Grade Type U Accuracy Type N Accuracy ACCURACY OF ELEMENTS Height H** (unit: µm) Pair Variation Width N** (unit: µm) Dimension Tolerance Pair Variation Dimension Tolerance ACCURACY RECOMMENDATION OF BALL SCREWS AND PROFILE RAILS Accuracy Grade Numerical...

LINEAR GUIDANCE ACCURACY Please select the most suitable grade of Nook Precision Profile Rail System for your application. For accuracy requirements beyond the tolerances indicated or for any special requirements, please contact Nook application engineers. Differences in Height “H” This defines the difference between the maximum and minimum heights “H” of the runner blocks that are mounted on the same rail. (See FIG. 1) Running Parallelism Running Parallelism is defined as the error in the parallelism between the datum planes of the rail and the runner block as the runner block is moved...

RAIL LENGTH The maximum lengths of rail for Nook Precision Profile Rails are shown in the table below. Longer lengths can be achieved by butt joining rails. Maximum length of rail track Model No. RAIL STRAIGHTNESS To obtain high accuracy guidance, the rail itself must be straight. It is very difficult to mount a distorted rail on a straight mounting surface. Nook rail manufacturing processes ensure straightness for ease of assembly and long life. Distortion free end cuts are achieved through an automated, wet, abrasive cut-off saw system. NOOK STANDARD PROFILE BALL RAILS

LINEAR GUIDANCE PRELOAD & RIGIDITY For correct operation under complex loading conditions, the selection of a suitable preload for linear motion bearings is essential. For extended life and accuracy under conditions of vibration and shock, the best results are usually achieved by using Nook Precision Profile Rails with heavy preload. Standard preload (Unit = kgf) Runner Block & Style NH-L Elastic deflection Elastic deflection Elastic deflection Elastic deflection without preload without preload Elastic deformation Elastic deformation with preload P with preload PPP * Stocked Preload–TO The...