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The point of
reference for fixture offset entries
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Almost all current model
machining center controls use fixture offsets for program
zero assignment. With most, the distance from the machine's
reference position (commonly called the zero return position)
to the program zero point must be determined for each axis.
These distances are called program zero assignment values.
If your setups are not predictable (as most are not), using
the machine's zero return position as the point of reference
for fixture offset entries is an acceptable use of fixture
offsets. However, if you make very predictable setups, as
is the case with subplates, it will be wiser to shift the
point of reference for fixture offset entries to a more
logical position, as is shown in the illustration provided
above.
This particular control uses a special fixture offset called
the common offset to shift the point of reference for fixture
offset entries. In this example, we're shifting the point
of reference to the lower-left hole (A-1). Because the component
tooling used with this subplate is predictable, specifying
the location of program zero relative to hole A-1 is easy--as
the illustration shows. If you're using subplates with component
tooling, you should be using this method to assign program
zero. It eliminates the need for program zero assignment
value measurements during setup.
Not all machining center controls provide this ability;
however, if yours does, there are some other reasons why
you'll find it helpful to shift the point of reference.
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