Siemens SINUMERIK 840D sl Programming Manual page 333

Description
General information about online TO
Depending on the timing of the dressing process, the following functions are used to write
the online tool offsets:
• Continuous write, non-modal: PUTFTOCF
• Continuous write, modal: ID=1 DO FTOC (see section synchronized actions)
• Discrete write: PUTFTOC
In the case of a continuous write (for each interpolation pulse) following activation of the
evaluation function each change is calculated additively in the wear memory in order to
prevent setpoint jumps. In both cases: The online tool offset can act on each spindle and
lengths 1, 2 or 3 of the wear parameters.
The assignment of the lengths to the geometry axes is made with reference to the current
plane.
The assignment of the spindle to the tool is made using the tool data for GWPSON or TMON
provided it does not concern the active grinding wheel (see the "Fundamentals"
programming manual). An offset is always applied for the wear parameters for the current
tool side or for the left-hand tool side on inactive tools.
Note
Where the offset is identical for several tool sides, the values should be transferred
automatically to the second tool side by means of a chaining rule (see Operator's Guide for
description).
If online offsets are defined for a machining channel, you cannot change the wear values for
the current tool on this channel from the machining program or by means of an operator
action.
The online tool offset is also applied with respect to the constant grinding wheel peripheral
speed (GWPS) in addition to tool monitoring (TMON).
PUTFTOCF = Continuous write
The dressing process is performed at the same time as machining: Dress across complete
grinding wheel width with dresser roll or dresser diamond from one side of a grinding wheel
to the other.
Machining and dressing can be performed on different channels. If no channel is
programmed, the offset takes effect in the active channel.
PUTFTOCF(Polynomial_No., Ref_value, Length1_2_3, Channel, Spindle)
Tool offset is changed continuously on the machining channel according to a polynomial
function of the first, second or third order, which must have been defined previously with
FCTDEF. The offset, e.g. changing actual value, is derived from the "Reference value"
variable. If a spindle number is not programmed, the offset applies to the active tool.
Job planning
Programming Manual, 03/2006 Edition, 6FC5398-2BP10-1BA0
8.3 Online tool compensation (PUTFTOCF, PUTFTOC, FTOCON, FTOCOF)
Tool offsets
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