TOMATECH AUTOMATION
3.20.2 Radial roughing cycle G72
Command function: G72 is divided into three parts:
⑴ 1st blocks for defining the travels of tool infeed and tool retraction, the cutting speed,
the spindle speed and the tool function in roughing;
⑵ 2nd blocks for defining the block interval, finishing allowance;
⑶ 3rd blocks for some continuous finishing path, counting the roughing path without
being executed actually when G72 is executed.
According to the finishing path, the finishing allowance, the path of tool infeed and retract
tool,the system automatically counts the path of roughing, the tool cuts the workpiece in
paralleling with Z,and the roughing is completed by multiple executing the cutting cycle
tool infeed→cutting feed→tool retraction. The starting point and the end point of G72 are
the same one. The command is applied to the formed roughing of non-formed rod.
Relevant definitions:
Finishing path: the above-mentioned Part ⑶ of G71(ns～nf block)defines the finishing
path,and the starting point of finishing path (i.e. starting point of ns block)is the same
these of starting point and end point of G72, called A point; the first block of
finishing path(ns block)is used for Z rapid traversing or cutting feed, and the end
point of finishing path is called to B point; the end point of finishing path(end
point of nf block)is called to C point. The finishing path is A→B→C.
Roughing path: The finishing path is the one after offsetting the finishing allowance(Δu,
Δw) and is the path contour formed by executing G72. A, B, C point of finishing path after
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