DoAll 21117, Instruction & Parts Manual

Page: 16 / 53

Instruction & Parts Manual
Pag.16
Edition A
Pos. Tab 6.2 Cutting bridge
6.2.1 Cutting bridge frame
6.2.2 Guiding columns
6.2.3 Columns connection
6.2.4 Lifting cylinder
6.2.5 Blade tension assembly
6.2.6 Blade drive assembly
6.2.7 Band brush assembly
6.2.8 Left and right band guide
6.2.9 Cutting servo-control
6.2.10 Wheels
6.2.11 Bland drive motor
6.2.1 Cutting bridge frame
The cutting bridge frame is a steel Fe37 weldment; it is machined to be assembled with other machine components.
The bridge was design and built to endure the cutting strength, keeping enough sturdiness.
The frame is mechanically machined and painted with anti-corrosion agents and with nitro paint.
The blade is completely protected where it does not work. Covering the wheels, there are two doors that can be opened to
change the blade. Two safety switches are mounted on these doors, so to stop the machine if the covers are not in position.
The blade rotates on the wheels, one of which is driven, and the other one is idler.
6.2.2 Guiding columns
The columns guide vertically the cutting bridge movement. They are made with chrome bars, hardened and grinded.
6.2.3 Columns connection
Made using a Fe37 steel plate, the columns connection connects and makes the guiding columns sturdier. It is fastened to the
columns through two bolts.
6.2.4 Lifting cylinder
This is an hydraulic cylinder, with chrome rod and lapped cylinder. The lifting cylinder is a double effect cylinder. The cylin-
der head is attached to the cutting head, and the end head is fastened to the machine base fraqme.
6.2.5 Blade tension assembly
The 260 NC utilize a manual band tension system. The proper band tension is assured by a set of springs located in the as-
sembly.
To release the blade, rotate CCW the band wheel. To tension the band rotate CW the wheel. The system has been designed
to guarantee a proper tensioning of the band. (see 15.4 Band replacement).
6.2.6 Band drive assembly
The band is powered by an AC motor which automatically regulates the cutting speed. The motor is directly flanged on the
speed reducer: this application reduces vibration while providing best possible torque. On the other end of the reducer there is
the drive wheel, that is fastened to the reducer.
6.2.7 Band brush assembly
A band brush is powered by an hydraulic motor, and it cleans the teeth removing the chips.