Cutting of CNC Milling circular arc dictates: G02, g03 detailed is solved

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G02: Clockwise (CW) circular arc cutting. G03: Anticlockwise direction (CCW) circular arc cutting. There is circular arc outline on workpiece all with G02 or G03 cutting, because milling machine workpiece is stereo, reason is on different plane direction of cutting of its circular arc (G02 or G03) if pursue,show 1 times. Its define way: According to system of right hand coordinate, the line of sight faces towards yearning negative way visits the square of planar and vertical axis, suitable hour hand is G02, anticlockwise for G03. Statement form: One, X - the circular arc on Y plane 2, Z - the circular arc on X plane 3, Y - the meaning of the location of each district of circular arc instruction on Z plane: X, Y, Z: Terminal coordinate position, usable absolute value (G90) or increment size (G91) express. R: Circular arc radius, with radius the value expresses. (the person that express with R calls radius way again) . I, J, K: Arrive from circular arc start position of the centre of a circle, the cent vector on axis of X, Y, Z. (the person that express with I, J, K calls way of the centre of a circle again) . The cent vector of X axis expresses with address I. The cent vector of Y axis expresses with address J. The cent vector of Z axis expresses with address K. F: Cutting feed rate, min of ／ of unit Mm. The expression of circular arc has law of the centre of a circle and radius way two kinds, at present cent narrates as follows: 1.

Radius law: Express circular arc radius with R, with radius the value expresses. This law expresses one circular arc with start and terminus and circular arc radius, there are 2 paragraphs of arcs to appear in the meeting on the circle, if pursue,2 are shown. Reason with R be when be worth, express ≦ of horn of the centre of a circle 180 ° person arc; R is negative worth when, express ＞ of horn of the centre of a circle 180 ° person arc. Pursue suppose 2 in, 50mm of R ＝ , terminal coordinate absolute value is (100.

, 80.

) criterion (1) the circular arc of 180 ° of ＞ of horn of the centre of a circle (namely method B) G90 G03 X100.

Y80.

R -50.

F80; (2) the circular arc of 180 ° of ≦ of horn of the centre of a circle (namely method A) G90 G03 X100.

Y80.

R50.

F80; 2.

Law of the centre of a circle: The numerical value at the back of I, J, K is a definition to arrive from circular arc start position of the centre of a circle, the cent vector on axis of X, Y, Z is worth. At present to in an attempt to 3, graph 4 specifications. Radius law or law of the centre of a circle are used to express one circular arc on CNC milling machine, the measure that end sees working plan go up is indicative and calm, in order to use more convenient person (need not calculate namely, the person that can see numerical value) to accept or reject. But if want milling when one full circle, can express with law of the centre of a circle only, radius law cannot be carried out. If use radius law to connect with 2 semicircle, its are true circularity error will be too big. If pursue,the instruction of one full circle writes 5 milling law: G02 I -50.

; Show to in an attempt to 6 for exemple, show the use that G01, G02, G03 dictates. Hypothesis cutting tool by program origin up edge outline milling. : G90 G01 Y12.

F80; → of origin of ＝ ＞ program AG02 X38.

158Y40.

I38.

158J -12.

; BG91 G01 X11 of → of ＝ ＞ A.

; → of ＝ ＞ B CG03 X24.

R12.

; DG01 X8 of → of ＝ ＞ C.

; E G02 X10 of → of ＝ ＞ D.

Y -10.

R10.

; FG01 G90 Y10 of → of ＝ ＞ E.

; G G91 X -15 of → of ＝ ＞ F.

Y -10.

; H X -20 of → of ＝ ＞ G.

; IG90 G03 X20 of → of ＝ ＞ H.

158R18.

; JG01 X0 of → of ＝ ＞ I.

; Origin of program of → of ＝ ＞ J: When cutting of circular arc of use G02, G03 dictates, should notice a few following: (1) after general CNC milling machine or MC switch on the mobile phone, namely set is G17 (X - Y is planar) , reason is in X - circular arc of the milling on Y plane, can omit G17 dictates. (2) when I, J and R should appearing at the same time in only part, it is with R preferential (namely effective) , i, J is invalid. (3) when I0 or J0 or K0, can not write elliptically, if pursue,2 are shown. (4) omit terminal coordinate of X, Y, Z points to when narrating, state start and terminus are same point, it is cutting full circle, if pursue 2 - 19 are shown. If use radius law cutting tool,arise without motion. (5) hand in at same point when terminal coordinate and designation radius value blame, can display caution message. (6) graph arc cutting is received at the back of linear cutting, its G instruction must be changed for G02 or G03, if go again when linear cutting, must change again dictate for G01, these are very easy by unwary. (7) use cutting dictates (G01, g02, g03) must dictate main shaft is rotational first, and F of rate of beard instruction feed. CNC Milling CNC Machining