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Fundamentals of G71 cycle

Introduction of G71

It is a canned cycle- multiple cut cycle. G71 cycle is a stock removal cycle, removing stock material from work piece performing turning operations ( turning operations- feed against 'Z' axis reducing diameter )






Turning cycle- G71

Turning cycle - G71 This cycle generates a part shape from a cylindrical raw material, with cuts along the

axis. The cycle definition has the part shape, depth of cut, finish allowance and couple of other parameters.

Cycle format

G71 U(D) R

G71 P (NO.1) Q(NO.2) U(u) W(w) F

N(NO.1)_ _ _ _

Cutting address (shape definition)

N(NO.2)_ _ _ _ _ 

U(D) = Depth of cut, radius value

R = Retract amount, radius value 

P=Number of the first block of the shape

 Q=Number of the last block of the shape 

U(u) = Finishing allowance in X, diameter value 

W = Finishing allowance in Z  

F= Feed rate

The blocks after the second G71 block define the part contour.

Parameter P has the number of the first block N(No.1) and  has the last block N(No.2)

G71 Turning Cycle Overview

  • G71 turning cycle cuts the whole contour repeatedly which is given in P Q blocks.
  • Depth of every cut can be controlled by first-block U value.
  • Second-block U W are the finishing allowances which can be given if you want to make a finish cut with G70 finishing cycle.
  • F is cutting feed and S is spindle speed (given in second-block) which are used during G71 turning cycle.

Note – The F and S given inside P Q block will not be used during G71 turning cycle, they are used with G70 finishing cycle if later called.

Example:-







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