Hyd-Mech DM8, Use And Maintenance Manual

Page: 136 / 156

9--1
The cutting speed is determined by the blade speed and the head feed speed.
While the head speed is provided by the downstroke movement of the head, the
blade rotation speed can either be fixed or variable. This chapter describes the
cutting speeds the machine can operate at in the standard version, as well as the
speeds for which the optional electronic speed controller (inverter) is necessary.
When using the DM 8, it is important to select the correct type of blade for the
material to be cut. This chapter explains the limitations and specific applications
of the different types of blades.
Cutting speed
Standard machine
The basic version with 2/4 pole motor, is provided with the following cutting
speeds:
-
1st speed = 36m/min. = 11.21 ft./min (4 pole)
-
2nd speed = 72 m/min. = 22.43 ft./min (2 pole)
These speeds are selected using the polarity change switch situated on the control
panel.
Machine with 4/8 pole motor (optional)
The machine can be provided with the optional 4/8 pole spindle motor, which
supplies the following cutting speeds:
-
1st speed = 18 m/min. = 5.61 ft./min (8 pole)
-
2nd speed = 36 m/min. = 11.21 ft./min (4 pole)
Machine with Inverter (optional)
The inverter is an electronic instrument fitted to the DM 8 G for varying spindle
motor rpm. The inverter makes life easier for the operator carrying out special
cutting tasks by enabling a changing of rotation speed to suit the kind of material
being cut. Blade use can thus be optimised, inasmuch as a blade not especially
suitable for cutting a certain material can be adjusted all the same to the task, and
premature wear is avoided.
The characteristics of this instrument will now be described and illustrated, as in
the ”Machine specifications” section.
Cutting speed: 1st speed from 20 to 45 m/min. (from 6.23 to 14.02 ft./min)
2nd speed from 35 to 90 m/min. (from 10.90 to 28.04
ft./min)
9
Cutting speed and
choice of tools