How to Set Starting Angle – G70 Bolt Hole Circle Example

G70 Bolt Hole Circle G-Code (canned cycle) is very simple to program due to its small number of parameters.

G70 bolt hole circle parameters are very self explanatory, but this cnc programming example emphasis on the Starting Angle parameter (G70 J).

G70 Starting Angle Parameter J – This is the value of starting angle of first hole ( 0 to 360° CCW from horizontal at the 3 o’clock position).

CNC Program Example

G70 Bolt Hole Circle Example

G70 Bolt Hole Circle Example

O1009
N10 T15 M06
N20 G90 G54 G00 X2. Y-1.5
N30 S1620 M03
N40 G43 H15 Z1. M08
N50 G81 G99 Z-0.45 R0.1 F8. L0
N60 G70 I1.25 J10. L8
N70 G80 G00 Z1. M09
N80 G53 G49 Z0. M05
N90 M30