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IS 15777 (2008): Selection of hacksaw tooth for metalcutting - Recommendations [PGD 32: Cutting tools]

IS 15777 : 2008

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Indian Standard

SELECTION OF HACKSAW TOOTH FOR METALCUTTING - RECOMMENDATIONS

ICS 25.100.40

© BIS 2008

BUREAU OF INDIAN STANDARDSMANAK BHAVAN. 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

June 2008 Price Group 1

Milling Cutters, Saws, Gear Cutting Tools and Broaches Sectional Committee, PGD II

FOREWORD

This Indian Standard was adopted by the Bureau of Indian Standards, after the draft finalized by the MillingCutters, Saws, Gear Cutting Tools and Broaches Sectional Committee had been approved by the Production andGeneral Engineering Division Council.

This standard is formulated based on the prevalent practice followed by Indian industry.

For the purpose of deciding whether a particular requirement of this standard is complied with, the final value,observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordance withIS 2 : 1960 'Rules for rounding off numerical values (re vised) '. The number of significant places retained in therounded off value should be the same as that of the specified value in this standard.

IS 15777 : 2008

Indian Standard

SELECTION OF HACKSAW TOOTH FOR METALCUTIING - RECOMMENDATIONS

1 SCOPE

This standard covers the recommendations for selection of tooth, feed rate and other parameters for hacksawcutting for different materials.

2 RECOMMENDED FEED, SPEED AND PITCH OF HACKSAW BLADE

SINo. Material Feed Speed Pitch

Pressure mm/Stroke Strokes/min For Material Up to For Materialkgf and Including 50 Over 50 mm

mm

i) Aluminium:a) Pure 25 0.075-0.3 100-135 4b) Alloy 25 0.075-0.3 100-150 4

ii) Brass:a) Free machining 25 0.075-0.3 120- 150 4,2.5 4b) Hard 25 0.075-0.15 100-135 4,2.5 4c) Tub ing 120-150 2.5, 1.8 2.5, 1.8

iii) Bronze:a) Commercial 25 0.075-0.15 90-120 4,2.5 4b) Manganese 25 0.075-0.15 60-90 4,2.5 4

iv) Copper 25 0.15-0.225 90-120 4,2.5 4

v) Iron:a) Pipe 25 0.075-0.225 90-120 2.5, 1.8 2.5,1.8b) Cast 25 0.225-0.3 90-120 4,2.5 6.3,4c) Malleable 25 0.15-0.225 90 4,2.5 4

vi) Magnesium 25 0.225-0.375 120-150 4 6.3

vii) Nickel silver 25 0.075-0.15 60 4,2.5 4

viii) Nickel alloy:a) Nickel 25 0.075-0 .225 60-90 4,2.5 4b) Inconol 25 0.075-0.225 50-80 4,2.5 4c) Monel 25 0.075-0.225 60-90 4,2.5 4

ix) Steel:a) Alloy 25 0.075-0.225 60-120 4,2.5 4b) Carbon tool 25 0.075-0.225 60-90 4,2.5 4c) Cold rolled 25 0.15-0.3 100-135 4 4d) Hot r('lI~d 25 0.15-0 .3 100-135 4 4e) High speed 25 0.075-0.15 60-90 4,2.5 4f) Machinery 25 0.15-0.225 100-135 4,2.5 4g) Stainless 25 0.075-0.225 60-90 4,2.5 4h) Structural 25 0.075-0.15 90- 135 4,2.5 4, 2.5j) Tool 25 0.075-0.225 60-90 4,2.5 4

x) Pipe and tubing 25 0.15-0.225 90-135 2.5, 1.8 4, 1.8

NOTE - Powe r hacksaw lechn ique s:

a) If teeth ripp ing occur, reduce pressure by 10 percent.

IS 15777 : 2008

b) If pitch is lowered than specified. the cutting efficiency will reduce.

c) Correct blade installat ion is also important. Pins should be as per pin hole dimensions to help distribute the pressure evenlyand prevent pin hole breakage .

d) When tightening the 'blade holder'. make sure the tensioning screw is well lubricated , then adjust the screw slowly at firstto allow pins to 'seat' .

e) Proper blade tension is essential and is achieved with the pins well seated in their holes prior to final tensioning.

f) Sawing (cutting) fluid should always be used, except when cutting cast iron and bronze . A good sawing fluid keeps thecutting edge cool and aids in clearing away chips.

g) Never stop a hacksaw machine while the blade is in the cut. If the blade has to be backed out of the cut, do so with themachine still running .

2

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