PAES 305:2000. Engineering Materials for Shafts

• This document is Philippine Agricultural Engineering Standard PAES 305:2000
• It concerns engineering materials for shafts used in agricultural machines

Foreword

• AMTEC initiated the creation of this national standard
• Project title: “Enhancing the Implementation of AFMA Through Improved Agricultural Engineering Standards"
• The Bureau of Agricultural Research (BAR) of the Department of Agriculture (DA) funded the project
• The Technical Committee for Study 2 reviewed the standard
• Study 2 is: Development of Standards for Engineering Materials
• The Philippine Society of Agricultural Engineers (PSAE) was presented with the standard
• The National Agriculture and Fisheries Council (NAFC) organized a public hearing on the material
• It was technically formulated in accordance with PNS 01:Part 4:1998 – Rules for the Structure and Drafting of Philippine National Standard
• It gives shaft specifications for agricultural machines
• The standards do not include manufacturing specifications

Scope

• This standard gives the specifications and technical information for the right application of shafts for drives in agricultural machinery

Reference

• PAES 304:2000: Engineering Materials - Keys and Keyways for Agricultural Machines Specifications and Applications contains provisions that are a part of this standard

Application

• Shafts: rotating, typically circular members
• They transmit power or motion
• They provide the axis of rotation/oscillation for components (gears, pulleys, flywheels, etc)
• Shafts control motion geometry

Materials

• Standard shafts for agricultural machines use steel designation 1020 (cold rolled)
• Stainless steel shafts often use steel designation 304/316 for special purposes

Power Rating

• Shaft power ratings: Tables 2-7
• Tables 2-4 are based on a safe shear stress ≈ 41.369 MPa for standard keyseated shafting
• For stainless steel shafts, multiply power ratings by a safe shear stress factor
• For safe shear stress of other materials, use 1/10 nominal ultimate tensile strength

Table 1 - Safe Shear Stress Factors

• Provides a range of safe shear stress values (3.447 MPa to 124.106 MPa) with corresponding factors (2.289 to 0.693)

Table 2 & 3

• Power ratings for cold-rolled steel designation 1020 for main power transmitting shafts (Table 2) and line shafts (Table 3) at various RPMs and shaft dimaters

Table 4

• Power ratings for cold-rolled steel designation 1020 for small, short shafts for shafts with diameter 16 - 165mm

Table 5 & 6

• Power ratings for stainless steel designation 304 and 316 for main power transmitting shafts (Table 5) and Line shafts (Table 6)

Table 7

• Power ratings for stainless steel designation 304 and 316 for small, short shafts

Shaft Set-Up

• Bearings provide support and alignment for the shaft
• Mount bearings on adequate supports to maintain alignment
• Misalignment causes shaft/bearing failure

Keys and Keyways

• Standards for keys and keyways: PAES 304:2000

Philippine Agricultural Engineering Standard PAES 305:2000 concerns engineering materials, specifically shaft specifications, for agricultural machines. This national standard was initiated by AMTEC and technically formulated in accordance with PNS 01:Part 4:1998.