Hyd-Mech M-16 - Step 4 Determine Optimum Blade Speed

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STEP 4
DETERMINE OPTIMUM BLADE SPEED,
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V (ft/min) (m/min)
The relationship between optimum blade speed and effective material width for various
materials is represented on the graph shown.
Optimum Blade Speed Curves
The graph shows that as effective material width gets wider or as material gets harder, lower blade
speeds are recommended. If material is narrow or soft, higher blades speeds should be selected.
In Example #1
- 8" (200mm) diameter #1045 Medium Carbon Steel solid bar is to be cut.
- On the graph above find the Medium Carbon Steel Curve which represents the optimum blade
speeds for 1045 Carbon Steel.
- On the horizontal axis (effective material width axis) find number 8 which represents effective
material width of an 8" (200mm) diameter solid.
- Find the point where a vertical line from 8" (200mm) intersects the Medium Carbon Steel Curve.
- From this intersection point run horizontally left to the vertical axis (optimum blade speed axis)
and find the point marked 200.
For 8" (200mm) diameter, 1045 Carbon Steel solid bar 200 ft/min (60m/min) is the optimum
blade speed.
NOTE: 1. Higher than optimum blade speed will cause rapid blade dulling. Lower than optimum blade
speeds reduce cutting rates proportionately and do not result in significantly longer blade life
except where there is a vibration problem. If the blade vibrates appreciably at optimum speed as
most often occurs with structurals and bundles, a lower blade speed may reduce vibration and
prevent premature blade failure.
2. Material Hardness - The graph above illustrates blade speed curves for materials of hardness
20 RC (225 Bhn) or lower. If the material is hardened then the multipliers need to be used. These
multipliers are given in the NOTE at the bottom right of the graph. As the hardness increases the
optimum blade speed decreases.