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Siemens SINUMERIK 840D sl Function Manual page 1464

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W1: Tool offset
18.6 Toolholder with orientation capability
Two rotary axes
Two general solutions exist for two rotary axes. The control itself chooses these two solution
pairs such that the orientation angles resulting from the frame are as close as possible to the
specified angles.
The two following options are available for specifying the angles:
1. If $TC_CARR21 or $TC_CARR22 contains a reference to a rotary axis, the position of this
axis at the start of the block in which the toolholder is activated is used to specify the angle.
2. If $TC_CARR21 or $TC_CARR22 does not contain a reference to a rotary axis, the values
contained in $TC_CARR13 or $TC_CARR14 are used.
Example
The control first calculates an angle of 10 degrees for one axis. The specified angle is 750
degrees. 720 degrees (= 2 * 360 degrees) are then added to the initial angle, resulting in a
final angle of 730 degrees.
Rotary axis offset
Rotary axis offsets can be specified with system variables $TC_CARR24 and $TC_CARR25.
A value not equal to zero in one of these parameters means that the initial state of the
associated rotary axis is the position specified by the parameter (and not position zero). All
angle specifications then refer to the coordinate system displaced by this value.
When the machining plane is changed (G17 - G19), only the tool length components of the
active tool are interchanged. The components of the toolholder are not interchanged. The
resulting tool length vector is then rotated in accordance with the current toolholder and, if
necessary, modified by the offsets belonging to the toolholder.
The two toolholder angles α
plane currently selected (G17 - G19).
Limit values
Limit angles (software limits) can be specified for each rotary axis in the system variable set
($TC_CARR30 to $TC_CARR33) used to describe the toolholder with orientation capability.
These limits are not evaluated if both the minimum and maximum value is zero.
If at least one of the two limits is not equal to zero, the system checks whether the previously
calculated solution is within the permissible limits. If this is not the case, an initial attempt is
made to reach a valid setting by adding or subtracting multiples of 360 degrees to or from the
invalid axis position. If this is impossible and two different solutions exist, the first solution is
discarded and the second solution is used. The second solution is treated the same as the
first with reference to the axis limits.
If the first solution is discarded and the second used instead, the contents of $P_TCANG[1/2]
and $P_TCANG[3/4] are swapped, hence the solution actually used is also stored in
$P_TCANG[1/2] in this case.
The axis limits are monitored even if the axis angle is specified instead of being calculated.
This is the case if TCOABS is active when a toolholder with orientation capability is activated.
1464
and α
are determined using a frame, independent of the active
1
2
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Basic Functions

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