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Lead screw assemblies
Lead screw assemblies
This document provides a comprehensive overview of Nook Industries' Precision Lead Screw Assemblies, focusing on Acme screws. It includes a glossary and technical data, selection criteria, application examples, and manufacturing processes. Key considerations such as column strength, critical speed, and material specifications are discussed.
Proper lubrication is essential for the optimal performance and longevity of lead screw assemblies. Nook Industries recommends specific lubricants for different nut materials, emphasizing the importance of maintaining a lubricant film on the screw.
This section details the characteristics and specifications of inch Acme screws and nuts, including a reference number system and quick reference charts. It covers the technical aspects of screw assemblies and twin-lead screw assemblies.
Similar to the inch section, this part provides technical data for metric screws and nuts, including column strength, critical speed, and a quick reference chart.
The document explains the Acme thread form, its types, and the significance of thread angles and tolerances. It highlights the differences between General Purpose, Centralizing, and Stub Acme threads.
Key design considerations include mounting and pinning of Acme nut flanges, lubrication, driving torque, and load definitions. The document advises on handling various loads such as static, dynamic, tension, compression, and thrust loads.
Optional features like surface coatings and protective boots for contaminated environments are available to enhance the durability and performance of the screw assemblies.
The selection process involves evaluating load, speed, length between bearings, and end fixity type to determine the appropriate screw and nut combination for specific applications.
The document provides detailed specifications and technical data for precision lead screw assemblies, focusing on factors such as speed, length, end fixity, critical speed, column strength, and PV value. It emphasizes the importance of selecting the appropriate screw based on these parameters to ensure optimal performance.
The travel rate is determined by the rpm and the lead of the screw. The unsupported length of the screw is a critical factor in determining its performance.
End fixity refers to how the ends of the screw are supported, affecting the screw's restraint and stability. The document describes different types of end fixity: free, simple, and fixed, with examples provided for each.
Critical speed is the speed at which the screw's natural frequency is excited, leading to resonance. It varies with diameter, unsupported length, end fixity, and rpm. The document recommends limiting maximum speed to 80% of the calculated critical speed.
Column strength is crucial when a screw is loaded in compression. The document provides a formula to calculate column strength and suggests options if the selected screw does not meet compression load criteria.
The PV value for PLAST/AC™ nuts is checked to ensure it is below the recommended maximum. The document provides formulas to calculate the operating load and relative speed.
An example is provided to illustrate the selection process for an acme screw in an automatic part feeder application. Steps include calculating axial force, travel rate, unsupported length, end fixity, and checking critical speed, column strength, and PV value.
Nook Industries manufactures precision acme screws using thread rolling, milling, or grinding processes, each offering unique qualities. Rolled screws are cost-effective, milled screws allow for varied journal machining, and ground screws offer high lead accuracy.
The document provides detailed specifications for Acme screw assemblies, including standard and custom machining options. It covers various screw sizes, lead accuracy, and standard lengths (36", 72", and 144"). The lead accuracy is specified as ±0.0003 in./in. for different thread sizes.
The load capacity is detailed for both dynamic and static conditions, with specifications for bronze and plastic nuts. For example, a 3/8" Acme thread has a dynamic load capacity of 703 lbs for a bronze nut and 351 lbs for a plastic nut.
Special lubricants are recommended to prolong the performance of Acme screws and nuts. The document lists E-100 Acme Screw Spray Lubricant and PAG-1 Acme Screw Grease, with further details available on page 14.
The document mentions machining options for Nook standard ends or custom requirements, with complete details on page 212. EZZE-MOUNT™ end bearing supports are available for various screw sizes, providing convenient mounting solutions.
Twin-lead screws are available for specific sizes, offering opposing motion through a single drive system. Details are provided on page 44.
The document emphasizes the responsibility of the product user to determine the suitability of Nook Industries products for specific applications. Defective products will be replaced if returned promptly, but no liability is assumed beyond replacement.
The document provides detailed specifications for various Acme screw assemblies offered by Nook Industries. These include different screw sizes, load capacities, lead accuracy, and standard lengths. The screws are available in different materials such as bronze and plastic nuts, with specific dynamic and static load capacities.
The load capacities for the screws vary based on the nut material and screw size. For example, a 1-3/4" Acme thread with a bronze nut has a dynamic load capacity of 15,312 lbs and a static load capacity of 49,900 lbs. The document lists similar specifications for other screw sizes ranging from 2" to 4-1/2".
Each screw size is accompanied by technical data such as lead, pitch, starts, threads per inch, and maximum axial lash. The efficiency and torque required to raise 1 lb are also specified for both bronze and plastic nuts.
The document mentions the availability of machining for standard or custom requirements. Custom lengths are available, and specific part numbers are provided for different configurations.
To prolong the performance of Acme screws and nuts, special lubricants such as E-100 spray lubricant and PAG-1 grease are recommended. Details for these lubricants are provided on page 14.
EZZE-MOUNT™ end bearing supports are available for convenient mounting of Acme screw assemblies. These supports are available in single or double bearing configurations and can be flange or universally mounted.
Twin-lead screws are available for all specified screw sizes, offering opposing motion through a single drive system.
The document concludes with a disclaimer stating that while the specifications are believed to be accurate, it is the user's responsibility to determine the suitability of the products for specific applications. Defective products will be replaced if returned promptly, but no liability is assumed beyond replacement.
This document provides detailed specifications for Acme screw assemblies, including dimensions, load capacities, and part numbers. The screws are available in standard lengths of 72", 144", and 240", with custom lengths available upon request. Key specifications include screw size, lead, pitch, starts, threads per inch, and maximum axial lash. The document also details the efficiency and torque required to raise 1 lb., along with the weight of the components.
The document specifies the weight and part numbers for both standard and No-Lash™ steel flanges. It also provides information on bronze and plastic nut options, including load ratings, torque requirements, and efficiency percentages.
The dynamic and static load capacities for bronze nuts are provided, with lead accuracy specified as ±0.0006 in./in. for both 5" and 6" Acme threads.
Special lubricants are recommended to prolong the performance of Acme screws and nuts. Detailed product information is available on page 14.
The document describes PowerAc™ modular assemblies, which include pre-engineered components with a 2-C Acme screw, steel mounting flange, and EZZE-MOUNT™ supports. These assemblies are designed for convenience and modularity, with options for motor mounts and end machining.
Technical data for Acme screw and nut assemblies is provided, along with 2D/3D CAD resources available on the Nook Industries website. Users are responsible for determining the suitability of products for specific applications, with defective products replaced if returned promptly.
- Lead Accuracy: Standard lead accuracy for Speedy™ screws is ±17.5µm/25mm, with an option for ±8.3µm/25mm on request. ISO trapezoidal screws have a lead accuracy of ±6.25µm/25mm.
- Temperature Range: Plastic nuts operate between -40° to +60° C, while bronze nuts can handle -40° to +200° C.
- Materials: Screws are made from corrosion-resistant alloy steel or stainless steel. Bronze nuts are available for higher loads, and special plastic materials can be ordered for demanding applications.
- Lubrication: Initial oil lubrication is generally sufficient for plastic nuts, with intervals adjusted based on application and environment. Bronze nuts require regular lubrication.
- End Machining: Options for standard or custom end machining are available, with specific configurations for single and double bearing supports.
- Users are responsible for determining the suitability of products for specific applications. Defective products will be replaced if returned promptly, but no liability is assumed beyond replacement.
- Metric screws are limited by maximum static load and slenderness ratio, with specific guidelines for maximum speed and column strength.
- Speedy™ Screw Sizes: Various diameters and leads are available, such as 5x5, 6x25, and 8x30, each with specific load ratings and efficiencies.
- Load Capacities: Bronze nuts have higher load ratings compared to plastic nuts, with specific torque requirements to raise 1 kN.
This document provides technical specifications and details for various lead screw assemblies and related components offered by Nook Industries. It includes information on metric screw assemblies, trapezoidal screw assemblies, and the EZZE-MOUNT™ end bearing supports.
The document outlines specifications for different screw sizes, including lead accuracy, load capacity, efficiency, and torque requirements. It provides detailed measurements for bronze and plastic nuts, including dimensions such as nut diameter, pilot diameter, flange diameter, and mounting hole specifications.
Lead screw assemblies are shipped with screws, nuts, flanges, and bearing supports. The document specifies standard lengths available (900mm, 1800mm, 3600mm) and notes that custom lengths can be ordered.
To prolong the performance of lead screws and nuts, special lubricants such as E-100 spray lubricant and PAG-1 grease are recommended. These products are detailed on page 14.
The EZZE-MOUNT™ end bearing supports provide a convenient solution for mounting trapezoidal and lead screw assemblies. Options include single or double bearing flange mounts and universal mounts.
The document emphasizes the importance of verifying the suitability of Nook Industries products for specific applications. While defective products will be replaced if returned promptly, no liability is assumed beyond replacement. For complete product details, references are made to specific pages within the document.
Nook Industries provides a range of lead screw assemblies, which include screws, nuts, flanges, and bearing supports. These assemblies are available in various sizes and materials, including bronze and plastic nuts, and are designed for different load ratings and efficiencies.
The document details specifications for metric lead screw assemblies, including dimensions, load ratings, efficiency, and torque requirements. Lead accuracy is specified as ±17.5µm/25mm for most products, with some variations.
Custom machining options are available for both standard and specific requirements. Detailed machining specifications can be found on page 212.
To enhance the performance and longevity of lead screws and nuts, special lubricants such as E-100 Lead Screw Spray Lubricant and PAG-1 Lead Screw Grease are recommended. Detailed information is available on page 14.
EZZE-MOUNT™ end bearing supports provide convenient mounting solutions for lead screw assemblies. Options include single or double bearing flange mounts and universal mounts. Further details are on page 214.
The document includes comprehensive technical data for various screw sizes, including diameter, lead, pitch, load ratings, and nut dimensions. Custom lengths are available, and specific part numbers are provided for different configurations.
While the specifications are believed to be accurate, users are responsible for determining the suitability of products for their applications. Defective products will be replaced if returned promptly, but no further liability is assumed.
Catalog excerpts
nookindustries.com 1 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. PowerAc™ Precision Lead Screw Assemblies PRECISION LEAD SCREW ASSEMBLY TECHNICAL INTRODUCTION 2-13 • Glossary and Technical Data 2-6 • Acme Screw Selection 6-7 • Application Example 8-9 • Column Strength and Critical Speed: Acme Inch Screws 10-11 • Acme Screw Manufacturing Processes 12 • Acme Nut and Screw Materials 13 LUBRICATION FOR PRECISION LEAD SCREW ASSEMBLIES 14 INCH ACME SCREW AND NUT TECHNICAL DATA 15-40 • Reference Number System: Acme Screws and Nuts 15 • Acme Screw and Nut Characteristics Defined 16-17 • Inch Acme Screws and Nuts 18-38 • Quick Reference Chart: Inch Acme Screws and Nuts 39-40 INCH ACME SCREW ASSEMBLIES 41-43 INCH TWIN-LEAD ACME SCREW ASSEMBLIES 44-45 METRIC ISO TRAPEZOIDAL AND SPEEDY™ SCREW AND NUT TECHNICAL DATA 46-78 • Metric Screw and Nut Introduction 46 • Reference Number System: Metric Screws and Nuts 47 • Column Strength and Critical Speed: Metric Lead Screws 48-49 • Metric Screws and Nuts: ISO and SPEEDY™ 50-76 • Quick Reference Chart: Metric Lead Screws and Nuts 77-78
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2 POWERAC™ TECHNICAL DATA 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 LEAD SCREW ASSEMBLY TECHNICAL INTRODUCTION 2D/3D CAD
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POWERAC™ TECHNICAL DATA PRECISION LEAD SCREW ASSEMBLY TECHNICAL INTRODUCTION 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. nookindustries.com 3 ACME THREAD FORM TERMS THREAD TYPES The acme thread form, established over 100 years ago, replaced square thread screws, which had straight-sided...
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4 POWERAC™ TECHNICAL DATA PRECISION LEAD SCREW ASSEMBLY TECHNICAL INTRODUCTION 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. 2D/3D CAD MATCHED LEAD When multiple screws are used to move a load with precise synchronicity, screws of similar lead accuracy can be factory selected...
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LOAD DEFINITIONS STATIC LOAD The maximum thrust load – including shock – that should be applied to a non-moving PowerAc™ Acme screw and nut assembly. DYNAMIC LOAD The maximum recommended thrust load which should be applied to the PowerAc™ Acme screw and nut assembly while in motion. PV LOAD Any material which carries a sliding load is limited by heat buildup. The factors that affect heat generation rate in an application are the pressure on the nut in pounds per square inch and the surface velocity in feet per minute. The product of these factors provides a measure of the severity of an application....
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6 POWERAC™ TECHNICAL DATA PRECISION LEAD SCREW ASSEMBLY TECHNICAL INTRODUCTION 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. 2D/3D CAD TEMPERATURE With proper lubrication, PowerAc™ Acme Screws with BRONZ/AC™ nuts operate efficiently between 15°F and 350°F, and PLAST/AC™...
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POWERAC™ TECHNICAL DATA PRECISION LEAD SCREW ASSEMBLY TECHNICAL INTRODUCTION 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. nookindustries.com 7 2D/3D CAD C: Both ends supported with a Double Bearing EZZE-MOUNT™. Use Line “C” in reference to the charts shown on pages 10-11 and 48-49. D: Both...
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8 POWERAC™ TECHNICAL DATA PRECISION LEAD SCREW ASSEMBLY TECHNICAL INTRODUCTION 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. 2D/3D CAD APPLICATION EXAMPLE APPLICATION Given the following requirements, select an acme screw for an application which uses Acme screws for an...
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POWERAC™ TECHNICAL DATA PRECISION LEAD SCREW ASSEMBLY TECHNICAL INTRODUCTION 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. nookindustries.com 9 2D/3D CAD STEP 4 Determine total unsupported length. Total Travel is given as 36 inches, but extra screw length should be considered for travel...
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