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TB083 Rev1 Rigid Tapping Guidelines
In order for the rigid tapping feature to be used it is necessary that a spindle encoder is mounted in a 1 1 ratio
with the spindle and wired into the 5th axis encoder input on the CPU7 card already provided with ATC kits
the tapping software option is unlocked and the following control parameters are set as in the table below
Parameter Value Function
34 4 096 Sets the counts per revolution cpr of the encoder The encoders so far have
been 1024 lines providing 4096 cpr If the encoder counts up when the spindle
turns CW then the value should be positive If the encouder counts up when the
spindle turns CCW then the value should be negative
36 Bitwise
value Bit 0 0 Disable rigid tapping 1 Enable rigid tapping
Bit 1 0 Wait for index pulse during rigid tapping 2 Do not wait for index pulse
Bit 2 0 Do not allow spindle override 4 Allow spindle override
Example
A value of 3 will enable rigid tapping bit 0 = 1 and during execution
will not wait for the index pusle to start bit 1 = 2 and the spindle override will not
change the spindle speed
bit 2 = 0
37 3 0 Spindle deceleration time Although the inverter accel/decel rates are
programmed at 0 seconds it does not take 2 seconds to decel at slower rates
Generating G code for rigid tapping is easily done with Intercon using drilling cycles to drill out the minor
diameter of the tap and then using the floating tap cycle to generate the rigid tap
Document History
Rev1 Created on 1999 12 03