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Series 16i/18i/21i Additional Manual Page 2

Additional Manual
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FANUC Series 16i /18i /21i – B, 18i – MB5
Optimal acc/dec decision at positioning
Specification
Oct.4.2004
2/9
A-79261E
1 Outline
Usually, the linear type positioning (G00) is used at the rapid traverse of an
extract motion when machining, especially drilling and tapping machining, on
the tilted plane.
At the linear type positioning, in order to keep the straight line, it is necessary to
use a constant time acc./dec. at rapid traverse (parameter No.1603#4=1) and set
the same time constants for all axes. (If the time constants are not the same,
interference between tool and workpiece may occur.)
In this case, it is necessary to set the time constant according to the time
constant of the axis with minimum acceleration ratio. Therefore, an idle time
may occur at the acceleration and deceleration.
By using this function, even if the different time constant is set for each axis, an
acceleration/deceleration with optimal time constant, which does not exceed an
allowable acc./dec. ratio for each axis, is calculated according to the rapid
traverse feedrate and commanded movement value for each axis. Therefore, the
cycle time of the machining may be shortened with keeping the straight line.
This function is an optional function.
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Contents Summary of Series 16i/18i/21i Additional Manual

  • Page 1FANUC Series 16i /18i /21i – MB FANUC Series 18i – MB5 Optimal acc/dec decision at positioning Specification - Contents - 1 OUTLINE............................................................................................................................ 2 2 SPECIFICATIONS..........................
  • Page 21 Outline Usually, the linear type positioning (G00) is used at the rapid traverse of an extract motion when machining, especially drilling and tapping machining, on the tilted plane. At the linear type positioning, in order to keep the straight line, it is necessary to use a constant time acc./dec.
  • Page 32 Specifications When the following parameter settings, an acceleration/deceleration with keeping the straight line is done at an optimal time constant calculated by the rapid traverse feedrate and commanded movement value for each axis even if the different time constant is set for each axis. Examp
  • Page 4(2) In case that this function is valid. At every rapid traverse block, the time constant of the axis specified by the program is automatically calculated to use the maximum acceleration ability of each axis, and the time constants are changed for the axes with parameter LRTx (No.1610#3)=1. Therefor
  • Page 5And during AI/AI nano high precision contour control and 5-axis machining function with RISC processor, when the rapid traverse with acc./dec. after interpolation (parameter FRP (No.19501#5)=0) is used, it is not possible to use linear type positioning with a constant time. In this case, please use
  • Page 63 Parameters #7 #6 #5 #4 #3 #2 #1 #0 1610 LRT [Data type] Bit axis LRTx Optimal acc./dec. decision at positioning is 0 : Invalid. 1 : Valid. Note 1. This parameter is valid when both parameter LRP (No.1401#1) and RPT (No.1603#4) are “1”. 2. Set this parameter for all axes, which are commanded at G00
  • Page 7Time constant T or T1 used for linear acceleration/deceleration or bell- 1620 shaped acceleration/deceleration in rapid traverse for each axis [Data type] Word axis [Unit of data] msec [Valid data range] Type of acc./dec. in rapid traverse Valid data range Non linear type 0 ~ 4000msec Linear type 0
  • Page 8Set the value when the rapid traverse override is 100%. The value of T1 is determined from the torque of motor. Usually set the value of T2 to 24ms or 32ms. Time constant T2 used for bell-shaped acceleration/deceleration in rapid 1621 traverse for each axis [Data type] Word axis [Unit of data] msec
  • Page 94 Notes (1) This function is invalid for the following feeds. - Cutting feed - Manual rapid traverse - Positioning command of manual numerical control - Positioning command of PMC axis control - Positioning command of chopping function (2) This function is invalid when the following function is atta