Reamer Technical Guide

 

Recommened Reaming Stock (Total)

  Tool Diameter
Type Mat Grp # 0.125 0.25 0.375 0.5 0.625 0.75 0.875 1 to 1.5
Al < 5% Si 1 0.012 0.015 0.016 0.018 0.020 0.021 0.022
Al > 5% Si 2 0.013 0.015 0.016 0.018 0.019 0.020
Brass 3
Bronze 4 0.014 0.017 0.019 0.020 0.021
Cast Iron 5 0.011 0.013 0.014 0.016 0.018 0.019 0.020
Ductile Iron 6 0.017 0.018 0.019
Steel < 35% C 7
Steel > 35% C 8 0.010 0.012 0.013 0.015
Tool Steel 9
Hard Steel 10 0.008 0.010 0.011 0.013 0.014 0.015 0.016
Stainless Steel - Free 11 0.010 0.012 0.013 0.015 0.016 0.017 0.018
Stainless Steel 12
Titanium 13 0.011 0.013 0.014 0.016 0.017 0.018 0.019
Soft High Temp. Alloy 14 0.010 0.011 0.013 0.014 0.016 0.017 0.018
Hard High Temp. Alloy 15 0.009 0.010 0.012 0.013 0.014 0.015 0.016
Plastics 16 0.012 0.014 0.015 0.017 0.019 0.020 0.021


Reamer Trouble Shooting Guide

Cause Scoring in Hole Bellmouth Hole Poor Finish High Wear Over- size Hole Under- size Hole Rifle marks or chatter Cuts hard, jams Solution
Worn tool margin         x x     Replace ir regrind
Worn cutting edges   x x           Resharpen reamer
Cutting edges not uniform x   x       x   Check lip height variation
Built up edges     x   x       Resharpen/coat reamer
Excessive reamer runout   x x   x       Check assembled runout
Misalignment - spindle to hole   x   x x x x   Correct alignment
Wrong machining data   x x x     x x Check feeds/speeds
Reamer too small           x     Use a larger reamer
Reamer too big                 Use a smaller reamer
Excessive stock removal     x x x x     Correct removal amount
Insufficient stock removal     x     x     Increase reaming allowance
Unsuitable coolant x   x x x x x x Change coolant type & mix
Chips not evacuating     x           Redirect coolant flow
Deflection from angular entry   x   x     x   Counter-sink bore
Deformation of workpiece             x   Correct clamping of workpiece
Poor Machinibility   x x x x       Check feeds/speeds/process

 

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