ACME Screw Threads

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ACME Screw Threads PDF

PDF NameACME Screw Threads
Published/Updated On
Category
RegionGlobal
No. of Pages123
PDF Size11.25 MB
LanguageEnglish
Source(s) / Creditswillrich.com

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ACME Screw Threads PDF - Overview

ACME Screw Threads – This Standard provides for two general applications of Acme threads: namely, general purpose and centralizing. The limits and tolerances in this Standard relate to single-start Acme threads and may be used, if considered suitable, for multiple-start Acme threads. The latter threads are used to provide relatively fast traversing motion when necessary. The three classes  of general purpose threads have clearances on all diameters for free movement.

This thread relies on the thread flanks to maintain concentric operation. The three classes of centralizing threads have a limited clearance at the major diameters of the external and internal threads so that a bearing at the major diameter maintains approximate alignment of the thread axis and prevents wedging on the flanks of the threads.

For any combination of the three classes of threads covered in this Standard, some end play or backlash will result. This is unavoidable for interchangeable products. When backlash or end play is objectionable, some mechanical means should be provided to eliminate the condition. In any case, sufficient end play must be left to provide a close running fit.

ACME Screw Threads

Contents of ACME Screw Threads

  • Foreword
  • Standards Committee Roster

1 – General

  • Scope
  • Federal Government Use
  • References
  • Reference Temperature
  • Units Of Measure
  • Terminology
  • Computer-Generated Size

2 – Specifications For General Purpose Acme Screw Threads

  • Angle Of Thread
  • Pitch And Lead Of Thread
  • Height Of Thread
  • Thickness Of Thread
  • Allowance (Minimum Clearance)At Major And Minor Diameters
  • Chamfers And Fillets
  • Basic Thread Form Dimensions
  • General Purpose Standard Acme Thread Series
  • Classification And Tolerances, General Purpose Acme Threads
  • Basic Diameters
  • Length Of Engagement
  • Tolerances
  • Allowances (Minimum Clearance) (Es) For Pitch Diameter
  • Limits Of Size
  • Thread Designations
  • Formulas For Determining Diameters
  • Maximum-Material Profile Option

3 – Specifications For Centralizing Acme Screw Threads

  • Angle Of Thread
  • Pitch And Lead Of Thread
  • Height Of Thread
  • Thickness Of Thread
  • Allowance (Minimum Clearance)At Major And Minor Diameters
  • Chamfers And Fillets
  • Basic Thread Form Dimension
  • Standard Centralizing Acme Thread Series
  • Classification And Tolerances, Centralizing Acme Threads
  • Basic Diameters
  • Length Of Engagement
  • Tolerances
  • Allowances (Minimum Clearance)
  • Limits Of Size
  • Thread Designations
  • Formulas Or Determining Diameters
  • Maximum-Material Profile Option

4 – Gages For General Purpose Acme Threads

  • Measurement Uncertainty Estimates
  • Application
  • Gage Blanks
  • Gage Tolerances
  • Gages For External Threads
  • Gages For Internal Threads
  • Asme B47.1 Gage Blanks

5 – Gaging For Centralizing Acme Threads

  • Gage Tolerances
  • Gages For External Centralizing Acme Thread
  • Gages For Internal Centralizing Acme Screw Threads

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