2.13
NO. Materials
Optimum
Blade
Speed
ft/min
Optimum
Blade
Speed
m/min
1 5” (125mm) diameter solid medium carbon steel 225 70
2 10” (250mm) I-Beam 270 90
3
4” x 4” (100mm x 100mm) Rect tube 1/4” (6mm)
wall
325 110
4 4” 9100mm) 400 stainless steel 140 45
5
2” x 2” (50mm x 50mm) Rect tube 1/4” (6mm) wall
bundle 5 x 5 pcs 10” x 10” (500mm x 500mm)
300 100
6 3” x 3” (75mm x 75mm) Inconel 60 20
STEP 5 - DETERMINE FEED RATE SETTING (FR) (in./min.) (mm/min.)
FEED RATE is the vertical speed at which the blade descends through the work piece.
The FEED RATE knob controls FEED RATE of the blade descent in the range of 0 to 15 in. per minute (380mm/min.) The
FEED RATE should be adjusted only in one direction (from “0” to required value). If you turn too far, the knob should be
turned back to “0” and back to the required value. To set FEED RATE for particular cutting situations, use the graph below,
which represents the relationship between FEED RATE, blade speed and blade pitch.
For Example #1, it is known from STEP 3 that optimum blade pitch is 2/3, and from STEP 4 that blade speed is 200 ft./
min. (60m/min.). From the graph on the left, the FEED RATE is determined in the following way:
• On the horizontal axis (blade speed axis), nd 200 ft./min. (60m/min).
• Find the point where a vertical line from 200 ft/min (60m/min) would intersect the 2/3 blade pitch curve.
• From this intersection point run horizontally left to the vertical (FEED RATE) axis, to arrive at 1.8 in/min (45mm/
min) FEED RATE. Thus, 1.8 in/min (45mm/min) is the FEED RATE for cutting 8" (200mm) diameter 1045 Carbon
Steel when the optimum 2/3 pitch blade is used.
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