
6. Interpolation Functions
6.13 Spiral/Conical Interpolation
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(5) P designates the number of pitches (number of spirals). (Type 1)
The number of pitches and rotations is as shown below.
Number of pitches
(0 to 99)
Number of rotations
P0
Less than 1 rotation
(Can be omitted.)
P1
1 or more rotation,
less than 2 rotations
Pn
n or more rotation,
less than (n+1) rotations
(6) Q designates the increment/decrement amount of radius per spiral rotation. (Type 2)
The number of spiral rotations when the radius increment/decrement amount is specified can
be calculated with the following expression.
Number of rotations= | (arc end point radius - arc start point radius)) | / | increment/decrement
amount of radius |
(7) L designates the number of pitches (number of spirals). (Type 2) (range: 0 to 99)
When omitted, L1 is designated.
The number of pitches and rotations is as shown below.
Number of pitches
(0 to 99)
Number of rotations
L1
Less than 1 rotation
L2
1 or more rotation,
less than 2 rotations
Ln
(n-1) or more rotations,
less than n rotations
Q takes precedence over L if both Q and L have been designated at the same time.
(8) K designates the increment/decrement amount of height per spiral rotation in conical
interpolation. (Type 2)
The increment/decrement amount of height is designated with I/J/K for the axis other than arc
plane.
The relation between increment/decrement amount of height and the rotation plane is as
shown below.
Rotation plane
Increment/decrement amount
of height
G18 J
command
G19 I
command
Other than G18/G19
K command
The number of rotations when the designation of increment/decrement amount of height is
specified can be calculated with the following expression.
Number of rotations = Height / | Increment/decrement amount of height |
If Q, K and L have been designated at the same time, the order of precedence is Q>K>L.
Decimal point command is possible in the range of the increment/decrement amount of radius
and height. Use mm (or inch) as the unit.