G91:Incremental Method

SYNTAX

G91 X....Y....F....

Where
(X,Y) is target point
F is feed rate

⇒The coordinates are measured using tool position as origin.
⇒Origin changes its position with each tool movement. 
⇒This method is widely used in subprogram
⇒If even one coordinate is wrongly calculated then the whole program will be incorrect 
⇒In incremental method start up and tool position program are same.
⇒There is change in the profile program only 

Profile

Billet size⇒X100 Y100 Z20
Tool usedSlot Drill Dia 6 mm(T1)

NC code

//absolute mode

G90 G00 X20 Y20
Z10
G01 Z-1 F60
G01 Y80
X40
Y60
X60
Y80
X80
Y20
X60
Y40
X40
Y20
X20
Z10 

// incremental mode

G90 G00 X20 Y20
Z10
G01 Z-1 F60
G91 G01 Y60
X20
Y-20
X20
Y20
X20
Y-60
X-20
Y20
X-20
Y-20
X-20
G90 G01 Z10

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