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Machine Tool Debugging
5.4.3. Machine Origin Setting
1) Homing is a procedure to synchronize local coordinate system with actual external coordinate
system via control system. In other words, since the concrete position of each axis is not detected
in the system, after system start-up, it will control the motion of each axis and detect the switch
signal pre-installed on each axis during the motion (the control system has already known the
installation position of these switches). Thus, once these switch signals are found, the system will
acquire the machine tool has reached the pre-specified position and then set the coordinate of this
position as current coordinates, namely, the local coordinate system is synchronous with the
actual one.
2) Coarse positioning is used to drive X/Y axis around the machine origin. And the following switches
can be adopted in coarse positioning, involving proximity switch, mechanical switch, photoelectric
switch, etc. Due to the limit of these switches on precision and repetition in positioning, the X/Y
axis is unable to return to machine origin exactly in coarse positioning, thus, fine positioning is
compulsory.
3) Fine positioning, with various methods, is used to make each axis return to machine origin exactly
by regarding encoder origin as fine positioning switch, i.e. the axis is searching for machine origin
in the motion via detecting encoder origin. Due to one origin signal sent per revolution of encoder,
fine positioning signal is periodic.
4) Set manufacturer parameters
―1.2 Bkref‖ in the software according to the installation positions of
zero sensors of the two axes. When the setting is correct, run
―Go Home‖ under [Mach] menu.
5.4.4. Worktable Stroke Range
After confirming machine origin and moving direction of each axis, set the developer parameters
―Lower & Upper limit of worktable stroke‖ and ―Check worktable stroke‖ according to the actual size of
a machine tool, so as to enable software limit function.
5.5. Speed Setting
Open NcEditor, then select [Mach], [System Parameters] and [Developer] sequentially to eject the
interface as shown in Fig. 5-3, in which [3.1 Speed/Acc] can be set.