Selecting Cutting Speed And Advance Speed; Blade Break-In Procedure - Jet ELITE EHB-270DGSVIP Mode D'emploi

10.5 Selecting Cutting Speed and Advance Speed

The cutting speed (m/min) and the advance speed (cm
=area traveled by the disk teeth when removing shavings) are
limited by the allowable heat rise at the tips of the teeth.
Cutting speed selection:
The general rule is the harder the material being cut, the
slower the blade speed.
- 20-30 m/min
For stainless steel, tool steel, bearing bronze.
- 30-45 m/min
For alloy steel, hard cast iron, hard bronze
- 45-60 m/min
For mild steel, soft cast iron, medium hard bronze, hard
aluminium
- 60-85 m/min
For plastic, soft and medium aluminium, other light
materials.
Note:
The cutting speed depends on the material tensile strength
2
(N/mm ), the material hardness (HRC) and the widest
cutting section (mm).
Advance speed selection:
Too high advance speed (= lowering of the saw frame) tends to
cause the blade to deviate from the ideal cutting path,
producing non-square cuts on both the vertical and the
horizontal plane.
The best combination of these two parameters can be seen
directly examining the chips.
- Long spiral-shaped chips indicate ideal cutting.
2
/min
- Very fine or pulverized chips indicate lack of feed and/or
cutting pressure.
- Thick and/or blue chips indicate overload of the blade
(cutting speed and / or advance speed too high).

10.6 Blade Break-in Procedure

New blades are very sharp and, therefore, have a
tooth geometry which is easily damaged if a careful
break-in procedure is not followed (Fig. 10-4).
When cutting for the first time, it is good practice to break-in
the blade making a series of cuts at a low advance speed (= 30-
2
35 cm /min on material of average dimensions with respect to
the cutting capacity and solid section of normal steel with R =
410-510 N/mm
Generously spray the cutting area with lubricating coolant.
Figure 10-4: Blade Break-in Procedure
22
2
).