Acme Screws, Ball Screws, Roller Screws and Ball Splines X!THOMSON A REGAL REXNORD BRAND

Nook/Thomson - the Choice for Optimized Motion Solution Often the ideal design solution is not about finding the fastest, sturdiest, most accurate or even the least expensive option. Rather, the ideal solution is the optimal balance of performance, life and cost. Quickly Configure the Optimal Linear Motion Solutions Nook/Thomson has several advantages that make us the supplier of choice for linear motion technology. • Nook/Thomson owns the broadest standard product offering of mechanical motion technologies in the industry. • Modified versions of standard product or white sheet design solutions...

Precision Screw Assemblies

QUALITY HISTORY Since 1969, Nook Industries, Inc. has relentlessly and continuously developed the capabilities and skills to deliver products of the highest quality. Knowledge of testing and design, coupled with this experience working with stringent customer requirements in aerospace, medical, energy and military applications has provided the background to be a reliable partner. INSPECTION CAPABILITY Laser Lead Measurement - Precise lead error gauging is utilized to validate processes to conform to Nook/Thomson internal specifications and customer requirements. HIGH TECH QUALITY EXPERIENCE When...

Precision Screw Assemblies QUALITY TOOLS: • • • • • • • • NOOK/THOMSON QUALITY EVOLUTION Design for Six Sigma manufacturing D.O.E. (Design of Experiments) APQP (Advanced Product Quality Planning) DFMEA, PFEMA FEA (Finite Element Analysis) DVP&R (Design Verification Plan & Report) Reliability Testing Process validation to 21 CFR Part 82 (Medical Device) DEVELOPED MANUFACTURING SYSTEMS QUALITY SYSTEMS AND ACCREDITATIONS SUPPLY CHAIN APPROVAL PROCESS TESTING Efficiency Measurement - Nook/Thomson Engineering has designed test machines to measure and validate screw assembly efficiency. STATE OF THE...

Nook/Thomson acme screws are used in a variety of military applications

ACME SCREWS Precision Screw Assemblies ACME SCREWS

ACME SCREWS AND NUTS MATERIALS & MANUFACTURING Manufacturing process photo Nook/Thomson acme screws are used in a variety of packaging applications Nook/Thomson manufactures precision acme screws by thread rolling, thread milling, or thread grinding processes. Each process produces high precision screws. Nook/Thomson acme screw products feature centralizing thread forms for smooth, no-wedging performance. ROLLED ACME SCREWS Nook/Thomson offers the largest selection of rolled acme screw sizes in the industry. Rolled thread screws are cost effective and are stocked for quick delivery. MILLED ACME...

Precision Screw Assemblies ACME SCREW ENGINEERING ACME SCREWS SCREW TYPE MATERIAL THREAD CLASS LEAD ACCURACY SCREW DIA. SCREW LENGTHS Rolled Alloy Centralizing 2C or Stub ± .0003”/” up to I'/i' dia. V to 6” Limited only by material availability Stainless Centralizing 2C or Stub ± .0003”/” up to W dia. 3/S” to W Limited only by material availability Milled Alloy Centralizing 2C or 3C ± .0027ft 3/J” to 3” (single starts) up to 96” Stainless Centralizing 2C or 3C ± .0027ft 3/J” to 3” (single starts) up to 96” Ground Alloy Centralizing 3C or 4C ± .00057ft 3/J” to 4” up to '20” ACME & TRAPEZOIDAL...

GLOSSARY AND TECHNICAL DATA ACME THREAD FORM TERMS THREAD TYPES - The acme thread form, established over 100 years ago, replaced square thread screws, which had straight-sided flanks and were difficult to manufacture. There are three main classes of Acme thread forms: General Purpose (G), Centralizing (C), and Stub Acme. The General Purpose and Centralizing thread forms have a nominal depth of thread of 0.50 × pitch and have a 29° included thread angle. Some Nook/Thomson sizes have 40° included angle. Trapezoidal thread forms have a 30° included thread angle. When compared to general-purpose...

Precision Screw Assemblies ACME SCREW ENGINEERING FIG. 2 Single Start (Lead = Pitch) Double Start (Lead = 2 × Pitch) Four Start (Lead = 4 × Pitch) Lead Lead Pitch and Lead LAND (MAJOR) DIAMETER - The outside diameter of the screw. PITCH DIAMETER - On an acme screw, this diameter is approximately halfway between the land diameter and the root diameter. It is the diameter at which the thread thickness is equal to the space between threads. ROOT (MINOR) DIAMETER - The diameter of the screw measured at the bottom of the thread. PITCH - The axial distance between threads. Pitch is equal to the lead...

GLOSSARY AND TECHNICAL DATA continued MATCHED LEAD - When multiple screws are used to move a load with precise synchronicity, screws of similar lead accuracy can be factory selected and supplied as sets. Consult factory for matched lead set tolerances. FIG. 3a Adjustable backlash nut assembly STANDARD NUT STANDARD FLANGE STRAIGHTNESS - Although PowerAc™ Acme Screws are manufactured from straight, cylindrical material, internal stresses may cause the material to bend or yield. NO-LASH™ FLANGE STANDARD NUT When ordering random lengths or cut material without end machining, straightening is recommended....

Precision Screw Assemblies LOAD DEFINITIONS STATIC LOAD - The maximum thrust load - including shock - that should be applied to a non-moving PowerAc™ Acme nut assembly. Actual maximum static load may be reduced based on end machining and screw mounting hardware. 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 caused by friction. The factors that affect heat generation rate in an application are the pressure on the nut in pounds...

GLOSSARY AND TECHNICAL DATA continued DESIGN CONSIDERATIONS (Cont’d) TEMPERATURE- With proper lubrication, PowerAc™ Acme Screws with bronze nuts operate efficiently between15°F and 350°F, and plastic nuts between 15°F and 175°F. Consult the factory for low temperature applications. END FIXITY - End fixity refers to the method by which the ends of the screw are supported. The degree of end fixity is related to the amount of restraint of the ends of the screw. Examples of the three basic types of end fixity are: Simple End fixity can be provided through a single bearing support. END MACHINING -...