TOMATECH AUTOMATION
to the
formed roughing of non-formed rod.
Relevant definitions:
Finishing path: The above-mentioned Part 3 of G71(ns～nf block)defines the finishing
path, and the starting point of finishing path (starting point of ns block)is the same these of
starting point and end point of G71, called A point; the first block of finishing
path(ns block)is used for X rapid traversing or tool infeed, 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.
Programming
Roughing path: The finishing path is the one after offsetting the finishing
allowance(Δu,Δw) and is the path contour formed by executing G71. A, B, C point of
finishing path after offset corresponds separately to A’, B’, C’ point of roughing path, and
the final continuous cutting path of G71 is B’→C’ point.
Δd: It is each travel(unit: mm, radius value) of X tool infeed in roughing, its value:
0.001~99.999(unit: mm/inch,radius value) without sign, and the direction of tool infeed is
defined by move direction of ns block. The command value Δd is reserved after executing
U(Δd) and the value of system parameter No.051 is rewritten to Δd×1000(unit: 0.001
mm) .
The value of system parameter No.051 is regarded as the travel of tool infeed when U(Δd)
is not input.
e: It is travel (unit: mm/inch, radius value) of X tool retraction in roughing its value:
0.001~99.999
(unit: mm,radius value) without sign, and the direction of tool retraction is opposite to that
of tool infeed, the command value e is reserved and the value of system parameter
No.052 is rewritten to e×1000(unit: 0.001 mm) after R(e) is executed. The value of system
parameter No.052 is regarded as the travel of tool retraction when R(e) is not input.
ns: Block number of the first block of finishing path.
nf: Block number of the last block of finishing path.
Δu: X finishing allowance is ±99999999× least input increment with sign symbol (diameter,
unit:mm/inch, with sign). X coordinate offset of roughing path compared to finishing path,
i.e. the different value of X absolute coordinates between A’ and A. The system defaults
Δu=0 when U(Δu) is not input, i.e. there is no finishing allowance in X direction for
roughing cycle.
Δw: Z finishing allowance is ±99999999× least input increment with sign symbol (diameter,
unit:mm/inch, with sign). the Z coordinate offset of roughing path compared to finishing
path, i.e.the different value of Z absolute coordinate between A’ and A. The system
defaults Δw=0
when W(Δw) is not input, i.e. there is no Z finishing allowance for roughing cycle.
K: When K is not input or is not 1, the system does not check the program monotonicity
except that the Z value of starting point and end point of the arc or ellipse or parabola or
the arc is more than 180 degree; K=1, the system checks the program monotonicity.
F: Feedrate; S: Spindle speed; T: Tool number, tool offset number.
M, S, T, F: They can be specified in the first G71 or the second ones or program ns～nf. M,
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