Theory and Design of CNC Systems Part 4 potx

... 20 4 3 10 0 30 6 4 10 0 40 8 5 0 0 40 8 6 0 10 30 6 7 0 10 20 4 8 0 10 10 2 9 0 10 0 0 Σ 40 48 As shown in Table 4. 2, the maximum value of output pulses is 8 and this is less than the number of ... is represented by Eq. 4. 19. X(0)=Y(0)=0 (4. 19) If we approximate Δ t, Δ X ,and Δ Y with dt, dx,anddy respectively, Eq. 4. 16, Eq. 4. 17, Eq. 4. 18, and Eq. 4. 19 can be...

Ngày tải lên: 11/08/2014, 20:21

... 54 G75, 54 G76, 54 G80, 54 G81, 54 G82, 54 G83, 54 G 84, 54 G 84. 2, 54 G 84. 3, 54 G85, 54 G86, 54 G87, 54 G88, 54 G89, 54 G90, 41 , 43 , 45 , 54 G91, 41 , 43 , 45 G92, 54 G 94, 54 G96, 53 G97, 53 G98, 54 G99, ... 51 G 44, 51 G49, 51 G50.1, 42 G51, 41 G51.1, 42 G 54, 41 G55, 41 G56, 41 G57, 41 G58, 41 G59, 41 G61, 48 , 126 G62, 49 G63, 49 G 64...

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... method of determining the cor- 4. 4 Look Ahead 147 0 5 10 15 20 25 0 20 40 60 80 100 120 140 160 Time(s) Velocity(mm/min) Fig. 4. 30 Speed profile for circular profile speed of the current block zero and ... 139 T D1 = F 1 −F  D (4. 74) T C1 = L 1 − F 2 1 2A − F 2 1 −F 2 2D F 1 (4. 75) The speed profile of the acceleration interval of Block N1 can be obtained by Eq. 4. 73...

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... task is called CNC programming. 8.3.1 The Sequence of Part Programming Roughly, CNC programming is composed of the generation of a process plan from a part drawing and the generation of the part program. ... GO/ON,LI82,TO,(PLANE/0.0,0.0,1.0,1.0),TO,LI83 CUT INDIRV/0.36 244 54, 0.932005,0.0 TLLFT, GOFWD/LI83, PAST, LI 84 GORGT/LI 84, TANTO,CI58 GOFWD/CI58,TANTO,LI85 T...

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... Corner Speed of Two Blocks Connected by an Acute Angle 142 4. 3 .4 Corner Speed Considering Speed Difference of Each Axis . . 144 4. 4 LookAhead 145 4. 4.1 Look-Ahead Algorithm . 147 4. 4.2 SimulationResults ... Contents 11 .4. 2 Part1 0:GeneralProcessData 40 5 11 .4. 3 Part 11: Process Data for Milling . . . 40 7 11 .4. 4 Part1 2:ProcessDataforTurning 40 7 11 .4. 5 Tools for...

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... make the part pro- gram without knowing the actual machining tool-length. G43 and G 44 are the codes for commanding tool-length compensation, G43 and G 44 denote the tool-length in- crease and tool-length ... code G41 commands tool- radius compensation to the left of the tool movement direction, G42 commands tool- radius compensation to the right of the tool movement direction,...

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... the interpreter of the CNC system is the soft- ware module of the NCK unit that interprets the part program consisting of G&M- code commands and related addresses such as S, T, and F. The interpreter ... the internal behavior of the interpreter, it is necessary to understand the structure of a part pro- gram and the commands used therein. In a CNC system, various c...

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... execution algo- rithms and implementation by pseudo-code. In this chapter, only the design of NCK will be described and the overall design of the CNC system where the PLC and MMI units are included ... toolpath in the workpiece coordinate system (G00, G01, G02, G03, G40, G41, G42, G43, G 44, G49) considering the previous block and the successor block data. Therefore, the G/...

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... methods and the method of designing a soft PLC system will be described together with design of Soft-NC in the later in this textbook. In Soft-NC, a PC is used as the hardware plat- form and all CNC ... Soft NC, Soft NC and Soft PLC can be regarded as the same system. Soft PLC which is made by a user interface and the PLC kernel based on the IEC1131-3 can be regarded as partia...

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... point of view. Furthermore, the design of the system kernel, which plays the role of booting up the CNC system, terminating the CNC system, communicating data and events to the tasks, and switching ... minimized and in which the number of tool changes is minimized, verifying tool paths and the finished part, and estimating machining time based on the minimum user input...

Ngày tải lên: 11/08/2014, 20:21