01.93 3 Directions of Movement, Dimensioning
3.7 Workpiece dimensioning, input system G70/G71
3.7 Workpiece dimensioning, input system G70/G71
The units of measurement can be entered in either mm or inches when programming.
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The initial setting of the input system is determined
by the machine data.
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The input system can be changed by means of the preparatory function G70 or G71:
G70 input system: inches
G71 input system: metric
The control converts the entered value into the input system of the initial setting. When this
type of block is processed, the value will be displayed already converted in the system of the
initial setting.
It is essential to ensure that the units of measurement are the same before selecting
subroutines or cycles.
The unit of measurement differing from the initial setting can be fixed for one or more blocks
or for an entire program.
The first block must then contain the necessary G function; the initial setting must be written
again after the last block (the initial setting comes automatically after M02, M30 end of
program).
The axes must be programmed after G70/G71 in a block. If this is not done, alarm 3006
"Wrong block structure" is output.
The following are dependent on the initial setting of the input system:
• Actual-value display (including setpoint/actual value difference)
• Zero offset
• Feedrate/cutting speed G94/G95
• Tool offset
The following are dependent on the programmed G70 or G71:
• Position data X, Y, Z
• Interpolation parameters I, J, K
• Chamfers/radii U-/U (B-/B)
• Parameters related to position data, interpolation parameters and chamfers/radii.
• Programmable zero offset (G58, G59)
© Siemens AG 1991 All Rights Reserved 6ZB5 410-0HD02 3–15
SINUMERIK 880, (PG)
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