Lead screw assemblies
78Pages

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

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

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...

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...

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...

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...

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:...

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...

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...