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G71 - bolt hole arc.

CNC systems can driil (tap or bore) holes in an arc using G-code command G71.

G71 is non-modal command. 

According to the entered radius of the circle and the number of holes, the holes for the bolted connection are drilled.

G71 I... J... K... L...

 I Radius of the bolt hole circle ( – CW / + CCW ).
  J Start angle of the first hole.
  K Angular spacing between bolt holes.
  L Number of bolt holes.


To manually create a CNC program for drilling holes located in a arc, you can use the free online utility.


Generate a G-Code toolpath for a various  details

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