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Installation manual
CNC 8060
CNC 8065
9.
CONCEPTS.
(REF: 1402)
Home search.
9.6 Home search.
What is home search?.
Home search is the operation used to synchronize the system. This operation must be
carried out when the CNC loses the position of the origin point (e.g. by turning the machine
off). Home search may be done in three ways.
• Manual home search, in JOG mode. The axes are homed one by one. The CNC does
not keep the part zero and the coordinates are displayed referred to machine reference
zero.
• Automatic home search, in JOG mode. This kind is only available when the home search
subroutine associated with function G74 (parameter REFPSUB) has been defined. All
the axes are homed at the same time. The zero offsets are not canceled. The position
values are displayed in the active reference system.
• Home search by program or MDI using function G74. The zero offsets are not canceled.
The position values are displayed in the active reference system.
When searching home, the axes move to a known point of the machine and the CNC
assumes the coordinate values assigned to that point by the machine manufacturer, referred
to machine zero. If the system uses distance-coded reference marks or absolute feedback,
the axes will only move the distance necessary to verify their position.
Machine reference system and machine reference point.
In order to perform the home search, the machine manufacturer has set particular points of
the machine; the machine zero and the machine reference point.
• The machine reference zero is the origin point of the machine reference system, set by
the machine manufacturer.
• The machine reference point is a point set by the manufacturer and referred to the
machine reference zero. This point may be located anywhere on the machine. The
position of the reference point, for each axis, is set at parameter REFVALUE.
OM Machine reference zero (home).
OW Part zero
H Machine reference point.
XMW, YMW, ZMW, Coordinates of the part zero.
XMH, YMH, ZMH, Coordinates of the reference point.
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