12 Functional Descriptions 12.93
12.7 Spindle functions
12.7 Spindle functions
12.7.1 Overview
The following spindle functions are available:
• Speed-controlled spindle
• Oriented spindle stop
• Position-controlled spindle (C axis)
The individual spindle functions are produced with the following spindle modes:
• Control mode Spindle rotates with constant speed or cutting rate (open-loop
control of spindle speed)
• Oscillation mode Spindle rotates at constant motor speed setpoint (open-loop control
of spindle speed)
• Positioning mode Spindle stops at a preset position (oriented spindle stop)
• C axis mode Spindle acts like a rotary axis (position-controlled spindle)
• Following error compensation for thread cutting
• Multiple thread
• Thread recutting
The principle improvements are:
• Spindle speeds up to 99 999 rev/min without actual-value encoder
• Spindle speeds up to 30 000 rev/min with actual-value encoder
• Encoder-specific resolution
• Monitoring of encoder cutoff frequency
• Adjustable zero mark
• Improved C axis mode
• Higher C axis speeds
• Improved positioning mode
General notes:
• With a spindle speed of 0.1, the feed actual value indication in the basic display with
functions G95/G96 is too low by a factor of 10.
• If the system includes several spindles, a function must always be assigned to the first
spindle.
12–34
© Siemens AG 1992 All Rights Reserved 6FC5197- AA50
SINUMERIK 840C (IA)
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