
A-78640E
Sheet
Title
Draw
No.
04 Feb.08.’03 Part of (4) is added or modified. Addition of 2.16.5
03 Jul.02.’02 A. Fukumoto Part of (3) is added or modified. T.Endo
02 May.13.’02 A. Fukumoto Addition of Tool Radius control for 5-axis machining etc T.Endo
Ed. Date Design Description
Date Jan.25.’02 Desig. A.Fukumoto Apprv. T.Endo
FANUC Series 16i /18i -TB
Specifications of AI High-Precision Contour Control /
I Nano High-Precision Contour control
110/190
2.23 Automatic Feedrate Control Function
2.23.1 Outline
This function reads several tens of blocks ahead to exercise automatic feedrate
control in AI HPCC / AI NANO HPCC mode.
A feedrate is determined on the basis of the conditions listed below. If a specified
feedrate exceeds a calculated feedrate, acceleration/deceleration before
interpolation is used so that the calculated feedrate can be established.
(1) Feedrate change and specified allowable feedrate difference along each axis
at a corner
(2) Anticipated acceleration and specified allowable acceleration along each axis
(3) Cutting load change anticipated from the direction of motion along the Z–axis
Specified tool path
Tool path when fee-drate
control is not used
Tool path when fee-drate
control is used
Machining error reduced due to
deceleration based on an allowable
acceleration
Machining error reduced
due to deceleration
based on an allowable
feedrate difference
Fig. 2.23.1 (a)
To use this function, set bit 0 (USE) of parameter No. 8451 to 1, and set the
following parameters:
Parameter No. 8410: Allowable feedrate difference used for feedrate
determination based on a corner feedrate difference
Parameter No. 8475 bit 2 (BIP) = 1: Enables deceleration at a corner.
Parameter No. 8470: Parameter specifying an allowable acceleration for
feedrate determination, based on acceleration
Parameter No. 8459, bit 1 (CTY) = 1, bit 0 (CDC) = 0
Parameter No. 8464: Initial feedrate for automatic feedrate control
Parameter No. 8465: Maximum allowable feedrate for automatic feedrate
control
For details, see the description of each parameter.