GSK GSK980TDc, Manual

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Chapter 3 G Commands
111
Ⅰ
Progra
mming
otherwise the following path will be wrong.
●
When the single block is running, programs dwell after each axial cutting cycle is completed.
● R( Δ d) must be omitted in blind hole cutting, and so there is no distance of tool retraction when
the tool cuts to axial end point of cutting.
Example ： Fig. 3-35
Fig.3-35
Program (suppose that the grooving tool width is 4mm, system least increment is 0.001mm):
O0007;
G0 X40 Z5 M3 S500; (Start spindle and position to starting point of machining)
G74 R0.5 ; (Machining cycle)
G74 X20 Z60 P3000 Q5000 F50; (Z tool infeed 5mm and tool retraction 0.5mm each time; rapid
return to starting point (Z5) after cutting feed to end point
(Z-20), X tool infeed 3mm and cycle the above-mentioned
steps)
M30; (End of program)
3.20.6 Radial grooving multiple cycle G75
Command format
：
G75 R(e)
；
G75 X(U) Z(W) P( Δ i) Q( Δ k) R( Δ d) F
；
Command function: Axial (Z) tool infeed cycle compounds radial discontinuous cutting cycle:
Tool infeeds from starting point in radial direction, retracts, infeeds again,
and again and again, and last tool retracts in axial direction, and retracts to
position in radial direction, which is called one radial cutting cycle; tool
infeeds in axial direction and execute the next radial cutting cycle; cut to
end point of cutting, and then return to starting point (starting point and
end point are the same one in G75), which is called one radial grooving
compound cycle. Directions of axial tool infeed and radial tool infeed are
defined by relative position between end point X(U) Z(W) and starting
point of cutting. G75 is used for machining radial loop groove or column
surface by radial discontinuously cutting, breaking stock and stock
removal.
Relevant definitions:
Starting point of radial cutting cycle:
Starting position of axial tool infeed for each radial cutting
cycle, defined by A
n
(n=1, 2, 3……), X coordinate of A
n
is