Pg 2.11 V18
ADDITIONAL CUTTING SETUP EXAMPLES
EXAMPLE # 2
Material Round Steel Tube SAE 4320 - Hardened to 35 RC ( 325 Bhn )
Dimensions - 6" O.D. x 4" I.D. (150mm O.D. x 100mm I.D.)
STEP I
Effective Material Width: 4 1/2" (.75 X 6) 114mm (19 x 6)
STEP 2
Feed Force limit setting for 6" Diameter material
.
Refer to Feed Force Limit, Setting in Step 2
STEP 3
Optimum blade pitch (TPI): 3/4 T. P. I.
Actual blade pitch on the saw: 4/6 T. P. I.
STEP 4
Optimum blade speed for 4 1/2" effective 225 ft/min (70m/min) material width
Blade speed reduced by hardness factor : 225 ft/min X .60 = 135ft/min
(70m/min x .60 = 42m/min)
STEP 5
Feed Rate for 3/4 TPI blade: 1.8 in/min (45mm/min)
Feed Rate for 4/6 TPI blade: 1.8 in/min X .70 =
1.3in/min
(reduced by finer than optimum blade pitch factor) (45mm/min x .70= 31.5mm/min)
EXAMPLE # 3
Material Bundle - Low carbon steel 2" x 2" Tube with 1/4" wall, 12 piece bundle
(50mm x 50mm with 6mm wall)
Dimensions - 6" x 8" (150mm x 200mm)
STEP I
Effective Material Width: 5" ( .6 X 8" ) 120mm (.6 x 200)
STEP 2
Feed Force limit setting for 8" Diameter material.
Refer to Feed Force Limit, Setting in Step 2
STEP 3
Optimum blade pitch (TPI): 3/4 T. P. I.
STEP 4
Optimum blade speed for 5 " effective material width - 320 ft/min (100m/min)
STEP 5
Feed Rate for 3/4 TPI blade: 4.0 in/min (100mm/min)
Feed Rate,
continued
If the saw is fitted with a blade coarser than optimum (e.g.. 1.4/2.5 TPI) we can still use the graph, but we go to
the 1.4/2.5 curve. As a result we find that the FEED RATE is decreased to 1.3 in/min (133mm/min) for this blade. If
however
, the machine is fitted with a finer than optimum blade (e.g. 3/4 TPI) we use the graph for the optimum blade
as before, and then use a multiplier given by the table below.
NOTE:
Use the following chart when cutting solids. For structurals, see
"CUTTING STRUCTURALS"
in STEP 2.
Optimum versus Actual Blade Pitch
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