Pg 28 S22A/S23A 2001b 2100 v1.0
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. (60mm/min). From the Graph on the left, the
FEED RATE is determined in the following way:
- On the horizontal axis (blade speed axis), find 200 ft/
min(60mm/min).
- Find the point where a vertical line from 200 ft./min.
(60mm/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.
NO. MATERIALS OPTIMUM BLADE SPEED
ft./min. m/min
1 5" (125mm) Dia Solid Carbon Steel 225 70
2 12" (300mm) I-Beam 290 90
3 4" x 4" (100 x 100mm) Rec Tube, 1/4" (6mm) Wall 350 110
4 4"(100) 400 Stainless Steel 140 45
5 2" x 2" (50 x 50mm) Rec Tube 1/4" (6mm) Wall
Bundle 5 x 5pcs 10" x 10" (500 x 500mm) 325 100
6 3" x 3" (75 x 75mm) Inconel 60 20
Materials and Blade Speed
The following table gives examples of the optimum blade speeds for different materials.
Feed Rate Calculation
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 0 to 15 in/
min. (380mm/min). The FEED RATE should be adjusted only in one direction (from “O” to
required value). If you go too far, the knob back to “O” 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.
---- Continued ----
Feed Rate Knob
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