CAM and numerical control process designing

1.

The main content of the content of process designing of 2 numerical control and process designing of measure numerical control includes: Analyse part drawing paper, undertake craft is handled, decide process; Mathematical processing, contrail of motion of center of computational cutting tool, obtain knife digit to occupy; Machine program of work out spare parts; Preparation controls medium; School nucleus program reachs first to try cut. General component is numerical control process designing the following measure (6-1 seeing a picture) : 1.

Analyse part drawing sample, the blueprint that undertakes craft handles personnel of ground process designing to want pair of parts above all and technology ask to be analysed in detail, make clear the content of treatment and requirement. Next, need to machine cutting tool of clamping apparatus of work of course of process of plan, treatment, treatment, design, choice certainly with advocate reasonable cutting dosage. The issue that craft processing involves is very much, personnel of numerical control process designing should notice the following: (1) certain treatment program reachs technical requirement according to the geometrical appearance characteristic of the spare parts, the choice machines equipment. The rationality that right now machine tool of numerical control of Lv of take an examination uses reachs economy, develop the function of numerical control machine tool adequately. (2) the method holding clip of correctly certain part and choice clamping apparatus are in CNC Machining, should special attention reduces auxiliary time, use clamping apparatus should accelerate the fixed position of the spare parts and clamp process, the structure of clamping apparatus is compared mostly simple. Use built up fixture has very big advantage, production prepares cycle weak point, standard component can be used repeatedly, economic effect is good. Additional, clamping apparatus itself should facilitate install on the machine tool, facilitate harmonious spare parts and the dimension that machine tool coordinate fastens concern. (3) chooses cutter track line to should choose cutter track route according to the requirement below reasonably: 1) the treatment precision that assures a spare parts and exterior surface roughness; 2) take optimal course, shorten as far as possible namely cutter track line, feed idle stroke, improve productivity, assure on the safe side; 3) be helpful for numeric computation, reduce block and process designing workload. Citing tries to explain below. When essence of life bores hole, the positional precision demand of aperture is higher, when arrangement takes cutter track line, must avoid to take the backlash error of reference axis, affect the positional precision of aperture directly. When cutting outline spare parts, cutting tool should of edge workpiece tangential cut cut, avoid radial to be cut cut, if cutting tool radial is cut, want to change athletic way when outline changes to treatment after be being cut, right now the size of cutting force and direction also will be changed and is retention period in workpiece surface, machining complex is out of shape generation flexibility, knife trace produces in working surface. Be like graph 6-2a, and tangential cut and cut will get good appearance coarse closely guard a secret, be like graph 6-2b. Inside cutting, outside also answer when the circle according to tangential direction cuts the principle that cuts to arrange cutter track line. When machining dimensional curved surface, if the choice is right,take cutter track line, can improve productivity greatly. For example: Machine half elliptic cylinder, be like edge generatrix cutting, see graph 6-3a, namely every time take the air line, knife dot calculation is simple, block is little. And not straight at axes direction, see 6-3b, cutting is a group of ellipse, numerical control machine tool is had only commonly mix point-blank function of circular arc interpolation, accordingly ellipse needs to use small straight line segment to approach, knife dot calculation is complex, and block is much. (4) when right choice accuses process designing to knife check the number, correctly choice is very important to knife dot. "To the knife dot " is namely when CNC Machining, the start that cutting tool moves relative to workpiece, its choose also is begin to carry out from this, to the knife the dot calls " of " program origin. When process designing, answer to choose to be nodded to the knife above all, its choose a principle to be as follows: 1) the place that chooses pair of knives (namely the start of the program) should make cheat Cheng Jian sheet; 2) search easily on the machine tool to knife dot, convenient treatment; 3) treatment process facilitating examination; 4) the machining error that cause is small. To the knife the dot can be set in machine a spare parts to go up or clamping apparatus go up or on the machine tool, but must the fixed position with the spare parts is standard have affirmatory concern. To raise the treatment precision of the spare parts, to the knife the dot should choose the design in the spare parts as far as possible fiducial or craft is fiducial on. To the spare parts that locates with aperture. The center that can take aperture regards pair of knives as the dot. To rat the dot is the start of the program not just, and the terminus that often is a program. Because of this aborning, want those who consider pair of knives to repeat precision. To rat when, should make be opposite rat dot and rat dot coincide. So-called mouse dot, it is the fixed position datum mark that points to cutting tool. Oppose the ball heart of ball head knife is for milling cutter; To car rat it is point of a knife; To broach it is to get a tip; Can use dial indicator to knife precision to rise or undertake searching to be opposite to rat appearance knife. In craft the handling center must decide speed of rotate speed of cutting deepness and width, main shaft, feed correctly to wait. Cutting parameter is specific and numeric should combine practice experience to try to decide according to the means that provides in principle of operation instruction handbook of numerical control machine tool, cutting. (5) logical choice still requires cutting tool of reasonable and right choice when process designing of cutting tool numerical control. The element that parameter of the type of working procedure of the process capability of the material function according to workpiece, machine tool, CNC Machining, cutting and other and treatment concern will choose cutting tool. It is to the total demand of cutting tool: Installation adjusts convenient, tigidity good, precision tall, durability is good etc. 2.

Maths treats the geometrical form according to the spare parts, take the function of cutter track line and numerical control system certainly, computation gives the contrail that cutting tool moves, get knife digit is occupied. Numerical control system is had commonly linear with function of circular arc interpolation. To the simpler planar part that forms by linear, circular arc, the look that wants computation to give spare parts rough sketch only gets the coordinate of the node of geometrical element or point of tangency to be worth, reach the coordinate of the centre of a circle of the start of each geometry element, terminal, circular arc is worth. If numerical control system does not have knife filling function, still celebrate computational rat to provide central contrail of motion. Complex to complex spare parts calculation, for example, round to be not curve (wait like corkscrewed yarn of involute, Archimedes) , need uses straight line segment or circular arc paragraph below the case that approachs precision of the labour in be being satisfied, computation gives a curve the coordinate value of each node, to free curve, free curved surface, the calculation that combines curved surface is more complex, its algorithm refers to this book to vacate paragraphic, need to be calculated with computational poplar commonly, finish hard otherwise. Processing of the error in numerical control process designing also is one serious problem, error of numerical control process designing becomes by face of 3 parts group: (1) the error that approachs the generation when the method approachs spare parts outline like the error, say to show again second approach an error, it uses straight line segment piece now or circular arc Duan Zhi receives the case that approachs outline to reach plan to add up to a curve to be able to bear or endure by batten function, also say to plan to add up to an error right now. Often decide hard because of what planning to add up to an error. (2) after interpolation error plans to add up to spare parts outline with batten function, when undertaking machining, must use linear or circular arc paragraph make 2 times approach, the error that arises right now also calls interpolation the error. Its error asks to decide according to the treatment precision of the spare parts. (3) the error of the generation when changeover of equivalent of the data processing in process designing of round full error, pulse, decimal circle is full is right the processing of empty error should notice to be able to produce bigger accumulation otherwise meaning error, bring about process designing error to increase thereby, should use reasonable circle to rectify change a method. 3.

Write spare parts machine program spare parts machine program can be written after finishing afore-mentioned craft processing and numeric computation, according to the process designing instruction of formulary block format, chase paragraph draw up the spare parts is added ah program. 4. Preparation control medium and the input that input program past great majority to control machine tool process control medium implementation through punched tape. In also can connecting Control Panel to be able to connect the method of fast to carry the program numerical control system directly now. 5. The program examines reach first to try cut ready program and punched tape must desired result and try cutting, ability is machined formally. Say commonly, punched tape carries card punch above all wear answer school function, whether does examination perforation have by accident. Next, the information input that gets on punched tape undertakes in numerical control system the knife examines going for nothing. Know exactly about sth accuses a machine tool to go up, the method that experimented in the past replaces cutting tool with the pen, squared paper replaces workpiece to have empty movement picture, check the validity of contrail of machine tool motion and movement. Go up in the numerical control machine tool that has a graph to display screen now, the method that uses the cutting process that shows knife contrail or simulation cutting tool and work undertakes checking more. To complex dimensional part, need to use olefin, wood undertake trying cutting. First try cut not only but whether does fish course have a mistake, knowable still path machines precision to whether accord with a requirement. When discovery is wrong, or modification program sheet or take the step such as dimension compensation. Latter-day, as the computer scientific ceaseless progress develops, can use advanced CNC Machining to emulate a system, undertake examining to numerical control foreword. 6.

1.

The design of the standard of process designing of 3 numerical control and code for numerical control machine tool, make, safeguard, those who make in order to reachs promotion is convenient, through old ceaseless practice and development, system of instruction of displacement of the input code that makes in numerical control process designing, coordinate, coordinate names, treatment instruction, auxiliary instruction, advocate motion and feed speed instruction, cutting tool instruction reachs block format to waited to already was made a series of standard. But, the code that each production manufacturer uses, instruction not identical, when process designing must the regulation in the manual of specific machine tool process designing that comply with uses. The relevant specification that in CNC Machining is being faced below, uses and code try to introduce. 1.

Punched tape and code punched tape are the input medium with the wider application on numerical control machine tool. The means that uses perforation on punched tape is recording the instruction of spare parts machine program. Our country is reached to use the punched tape of 8 units extensively on international. The encode of punched tape uses ISO or EIA level on international, the punched tape norms of two kinds of code is made according to EIA RS-227 standard. Our country JB3050-82 is as equivalent as its, standard perforation takes norms to see graph 6-4, ISO and EIA code see watch 6-1. Reach punched tape norms by acting stopwatch knowable, of punched tape every (row) share 9 aperture, among them the one feed hole in listing alveolus to call or synchronous aperture, use generation to read the synchro control news of the belt. 8 large hole combine the others to show number, letter or sign. Aperture states binary "1" expresses to be "0" without aperture. In ISO standard, code mixes by 7 binary number occasionally desired result composition. Every code its also several the sum must be even number, it is namely occasionally desired result, it is when the Kong Shu of a certain code odd when, go up with respect to the 8th when go in this code wear one aperture, make its a total even. In EIA standard, the Kong Shu of all code must is odd, the 5th Kong Yonglai fills strange. The input of numerical control machine tool has circuit of special odd even desired result in the system. When the strange, even number that once violate ISO or EIA standard,provides when the code of the input, control system can issue bad news namely, command stop machine. ISO standard code is 7 encode, and EIA codes for 6 (do not include odd even desired result) , consequently ISO code number compares EIA me one times. ISO code regularity is strong, digital code the 5th, have opening 6 times, word the 7th all have opening, symbol the 7th list or all have opening the 6th times. These rules are convenient to reading the design of belt and numerical control system to be brought. 2.

Department of coordinate of numerical control machine tool names to assure the true sport of numerical control machine tool, shun the job abhorrent sex, simplify process designing and facilitate groom process designing personnel, unite the code that stipulated numerical control carries bed reference axis on the head to reach its to move, negative direction. According to ISO standard and standard of our country JB3051-82, the reference axis of numerical control machine tool names a regulation to be as follows: The sharp movement of the machine tool is used fasten for Cartesian rectangular coordinates, its coordinate names for X, Y, Z, , law of use right hand decides direction, if pursue,6-5 place is shown. When the thumb of the right hand, forefinger and middle finger are mutual and perpendicular, criterion the square that the direction of big toe is X reference axis to, forefinger shows an axis for Y character to, the square that middle finger is Z reference axis to. With reference axis of X, Y, Z line or with be being met with X, Y, Z the reference axis line of mark axis parallel is in in axial motion, call A, B, C respectively. The square of A, B, C to decide by law of right hand helix. See graph 6-7, become namely when screw of right hand enclasp, big toe is pointed to + X, + T, + Z axis to when, criterion the others 4 show direction is respectively + A, + B, + the direction of rotation of C axis. The motion of Z coordinate delivers the main shaft regulation of cutting force to be Z reference axis. To milling machine, boring machine and tap machine tool, the axis of rotational cutting tool calls main shaft. And bed of lathe, blown away by wind criterion with rotational workpiece call main shaft. If, there are a few main shafts on the machine tool 100, choose among them an as vertical as tool reference plane of workpiece outfit clip axis gives priority to an axis. Become a bed when doing not have main shaft, choose perpendicular block a department at workpiece outfit. The athletic X coordinate of X coordinate is a level, its parallel blocks a side at the outfit of workpiece. The machine tool that rotates in workpiece (wait for) like lathe, grinder, take parallel the direction at transverse slide carriage (the radial of workpiece) for X coordinate. Because this installation is in horizontal tool carrier (the cutting tool on horizontal feed stage leaves direction of workpiece runner shaft coming back to be X square up. The machine that rotates to cutting tool is troublesome (for example milling machine, boring machine) when Z axis is a level, look to the direction of workpiece along cutter spindle, it is X axis square to right way to. Reference axis of Y of motion of Y reference axis is vertical reach Z coordinate at X. By right hand right angle Cartesian coordinate system decides its square to. Above is to take the direction that increases workpiece and cutting tool to be far from workpiece to be square to. Get for example, boring treatment, the way that cuts work is the negative direction of Z coordinate. For the convenience of process designing, no matter the particular structure of numerical control machine tool is workpiece is secured do not move cutting tool shift, or cutting tool is fixed do not move workpiece to move, when affirmatory coordinate is fastened, uniform the circumstance that moves to workpiece according to cutting tool photograph. Secure when actual cutting tool when moving workpiece to say to move, workpiece (opposite Yu Dao is provided) athletic rectangular coordinates is X, Y, Z accordingly. But by bead both is opposite motion, although be workpiece motion actually, still undertake process designing relative to athletic X, Y, Z with cutting tool, the result is same. Besides the sharp movement of main way of X, Y, Z, return those who have other to go up parallelly to it the line moves, can name respectively for reference axis of U, V, W, calling the 2nd coordinate is. If have again, usable P, Q, R expresses. If be besides whirligig A, B, C, still have other whirligig, usable D, E, F expresses. 3.

The coordinate of absolutely coordinate and contrail of increment coordinate motion is nodded with fixed coordinate origin metric, call absolutely coordinate. Pursue for example 6-8 place is shown, the coordinate that A, B nods all is nodded with securing. Coordinate origin is metric, its coordinate value is: XA=30, YA=40, XB=90, YB=95. The terminal coordinate of athletic contrail is worth, with its the coordinate with metric start calls increment coordinate is (or sit to fasten) relatively. The U of department of the 2nd coordinate in commonly used acting stopwatch, V, W parts as parallel as X, Y, Z and with to. Dot of the B in graph 6-8B is coordinate of the U that builds for origin with start A, V comes metric, the increment coordinate of terminal B is: UB=60, VB=55. 6.

1.

The instruction code of process designing of 4 numerical control is in numerical control process designing, code of use G instruction, the athletic feature that instruction of M instruction code and F, S, T dictates the description processes process and numerical control system. Of numerical control machine tool open stop, the auxiliary function such as cooling fluid switch and give out rotate speed of feed speed, main shaft. On international use ISO-1056-1975E level extensively, trade department makes national machinist wanted as equivalent as the standard JB3208-83 standard is used in numerical control process designing. Its code sees watch 6-2 and watch 6-3. Preparative function instruction also calls "G" the instruction. It is by suddenly mother "G" is mixed ever since composition of 2 digit word, see watch 6-2) to G99(from G00. This instruction basically is to command numerical control machine tool undertakes why be plantinged athletic, make good preparation to control interpolation operation of the system. So general they are located in in block before coordinate number instruction. Commonly used G instruction has: (Instruction of 1)G01- linear interpolation makes the machine tool undertakes two coordinate (or 3 coordinate) the motion of linkage, what take up the post of meaning beyond rate in the cutting inside each plane is linear. (Interpolation of circular arc of 2)G02, G03- dictates G02 is instruction of clockwise arc interpolation, g03 is instruction of anticlockwise round station. The suitable, in going against direction to be able to press graph 6-9, gives out direction of circular arc undertakes judging. Be in plane along circular arc namely (YZ is planar) the negative direction of another coordinate (namely - Y) looks, the clockwise is G02, go against the direction that receive an injection to be G02, anticlockwise direction is G03. Before interpolation dictates, use circular arc must apply plane to choose to dictate, appoint the plane of circular arc interpolation. (3)G00- - sudden drop fixed position dictates it commands cutting tool to nod sudden shift in order to choose position control way to arrive from cutting tool place next target position. It is fast fixed position only, and ask without athletic contrail. (Plane of coordinate of 4)G17, G18, G19- chooses to dictate G17 appoints a spare parts to have the treatment on XY plane, g18, G19 is the treatment on plane of YZ, ZX respectively. These instructions are undertaking circular arc interpolation, when cutting tool is compensated, must use. Code of M of watch 6-3 auxiliary function (device of numerical control of instruction of compensation of radius of cutting tool of 5)G40, G41, G42- has cutting tool radius to compensate a function mostly, offerred for process designing convenient. When outline of milling spare parts, do not need contrail of motion of center of computational cutting tool. And need to press process designing of spare parts outline only, radius of use cutting tool amends a statement, use cutting tool to dial a code on Control Panel dish or radius of cutting tool of clavier manual input, numerical control unit exceeds contrail of cutting tool center with be being calculated automatically, move by contrail of cutting tool center. After cutting tool wears away or cutting tool is ground again, decrescent of cutting tool radius, need to input the cutting tool radius after the change by hand only, and do not revise the order that already had booked or punched tape. Using same have cutting tool when thick, finish machining, set finish machining surplus to be, criterion the compensation of rough machining is, and the compensation instead R of finish machining can. G41 and G42 part roller is left (right) slant instruction of cutting tool Lian, look along direction of cutting tool advancement namely (hypothesis workpiece does not move) , what cutting tool is located in a spare parts is left (right) compensation of radius of the cutting tool when side. F40 amends cancel statement for cutting tool radius. After using this statement, make instruction of G41, G42 invalid. (6)G90, G91- - the coordinate value that rain of absolutely coordinate feet and G90 of instruction of process designing of increment coordinate dimension represent to the program is inputted presses absolutely coordinate value to take; G91 states the coordinate value of block presses increment coordinate value to take. Assisting functional instruction to also call "M" it is by the letter "M" is mixed ever since two acute block are become, arrive from M00 M99 in all 100 kinds, see watch 6-3. The interpolation operation of these instructions and numerical control system has nothing to do, basically be for CNC Machining, machine tool is operated and the craft sex instruction of set reachs auxiliary function, it is numerical control process designing is indispensable, commonly used auxiliary function dictates as follows: (1) M00- - program volume stops after the other function that fulfils this block, main shaft, feed, cooling fluid sends into stop. Right now executable some hand moves an operation, if workpiece tune, hand moves gearshift to wait, if press afresh again,be controlled and board the loop that go up starts pushbutton, continue to carry out below one block. (2) M01- - optional stop this instruction and M00 photograph similar. What what differ is, must grant on operation face plate first the " below press is optional stop " pushbutton, ability makes the program stops, otherwise M01 will be not effective. When part handling time longer, or need to stop machine examination in machining a process, when measuring the situation such as crucial position and commutative class, use this statement very convenient. (3) M02- - program end uses this statement when total order ends, it makes main shaft, feed, cooling fluid sends into stop, make machine tool restoration. (4) M03, M04, M05- - main shaft suitable hour hand rotates (turning) , main shaft is anticlockwise rotate (invert) reach main shaft stop instruction. (5) M06- - the machine of work center numerical control that the instruction that change a knife uses at possessing knife library celebrates the function that change a knife. (6) M08- - cooling fluid leaves. (7) M09- - cooling fluid closes. (8) M30- - the program ends and take besides the function that has M02, this instruction still makes punched tape is answered to position of rest. (9) M98- - the subprogram calls a statement. (10) M99- - the subprogram returns a main program to dictate. 6.

1.

The structure of 5CNC Machining program and format 1.

The program of structural CNC Machining of the program is by the program date, block and corresponding symbol are comprised. Graph 6-10 place shows the machine program of the spare parts to be as follows: 0600NI G92 XO YO NI; N2 S300 M03; N3 G90 G00 X-5.

5Y-6; N4 Z-1.

2M08; N5 G41 G01 X-5.

5Y-5.

D03F2.

4; N6 Y0; N7 G02 X -2.

Y3.

5R3.

5; N8 G01 X 2.

Y3.

5; N9 G02 X 2.

Y-3.

5R3.

5; N10 G01 X -2.

Y-3.

5; N11 G02 X -5.

5Y0R3.

5; N12 G01 X -5.

5Y5.

; N13 G40 G00 X -5.

5Y6.

M09; N14 Z1.

M05; N15 X0 Y0; N16 M30; By this can see, the begin of the program keeps serial number having Cheng: 0600 (program name) try in order to facilitate to distinguish with other program. It is piled up by program name address (0) the number that reachs a program (600) composition. Different numerical control system, code of program name address is discriminating. FANUC 6M is 0; SMK 8M system is used % etc. This program is comprised by 16 block. Program end decides M30, it is program cease instruction. 2.

Format of block format block basically has word address alterable block format, separator secures ordinal block format to wait. (1) alterable block format uses word address extensively domestic and internationally at present word address is alterable block format. Alleged and alterable block namely the length of block is alterable be, recommend use JB3832- - outline of machine tool of 85 numerical control and choose a treatment standard of alterable block format. Every block of word address by a certain number of word composition. Every word by English letter begin, ever since follow closely number (there is a sign before some numbers) form, it represents one of numerical control system material statement. The letter represents the address of the word, for example, n is block address code, use at instruction block date; G is the preparative function address of statement action way; X, Y, Z is reference axis address, the number at the back of its shows the distance with this mobile coordinate; Semicolon " ; "End a sign for program paragraph. Word address is alterable general pattern is block: Word of word of program paragraph serial number... word block ends a sign. Exemple: N3 G90 G00 X-5.

5Y-6.

This 0 are medium, block is composed by 5 words. Word N3 is the suitable serial number of block, the suitable serial number of block, g90 expresses absolutely coordinate process designing, g00 states sudden shift chooses location, x-5.

5 reach Y-6.

Show X and the direction with Y mobile coordinate and distance, block end must be written block ends a sign. A number of the word that place of every paragraphs of program contains this block format can differ, the basis needs and decide, use convenient; The order of information has discrepancy a bit, numerical control device can be read take; The information be clear at a glance that includes inside block, the program facilitates revise reach desired result. (2) format of separator solid methodize this block format is to use space to part the word, the function of the order of every word and delegate is changeless. For example system of numerical control of cut of our country line uses "3B" extensively (or 4B) instruction, express to be commonly: BXBY-BJGZB is separator, the function that every word represents is fixed, its meaning is as follows: When treatment of direction of computation of length of computation of symbol of space of cost of coordinate of Y of symbol of space of cost of coordinate of X of symbol of space of B X B Y B J G Z dictates treatment is linear, the design that X, Y is, creation is brought convenient. It does not require plant of numerical control of address differentiate circuit simpler, the increment coordinate of terminus of relatively straight face is worth the price; When machining circular arc, for circular arc paragraph the increment coordinate value of start. Amount to of format of separator solid methodize accuses device circuit petty gain. But the information that contains in block is not easy instantly the sheep is broken, instruction order does not allow the defect such as the change absolutely, use lesser now. 6.

1.

Of the method of process designing of 6 numerical control and to program of its development numerical control advocate the law has two kinds, manual process designing has automatic process designing. 1.

Method of manual process designing calculates cutting tool from procedure of blueprint of analytic spare parts, formulate, ground athletic contrail, write sheet of spare parts machine program, preparation to control medium till program officer nucleus, whole process is the method of this kind of process designing that finishs by the person calls manual process designing. Not quite complex to geometrical appearance simpler part, calculation is simpler, machine program is not much, punched tape is very not long, use manual concordant to come true more easily. But, to the part with complex form, have outline of the curve that be not a circle, list curve, especially to having the part of list curved surface, combination curved surface or although element of spare parts geometry is not complex, but the part with program very large amount, there is thousands of opening on a spare parts for example, and when outline milling is decreased, numerical control device does not have cutting tool radius automatic deflection function, and the athletic path emperor that can press cutting tool center only has the case such as process designing, data accuses device not to have cutting tool radius automatic deflection function, and the athletic contrail that can press cutting tool center only has the case such as process designing, computation is quite trival, program amount is very large, manual process designing is competent hard, cannot make up a program to come even. And artificial perforation is a trival job more, according to the production of foreign statistic and our country this carry out explains, when using manual process designing, the than be our country on average about production of the process designing time of a spare parts and machine tool handling time carries out a specification, when using manual process designing, of the handling time on the process designing time of a spare parts and machine tool it is than making an appointment with on average 30: 1. And data accuses machine treat with courtesy to often be made up as a result of spare parts machine program do not come out and did not develop its function. 2.

Method of automatic process designing has technology by the computer processing, numeric computation, write spare parts machine program, output sheet of spare parts machine program automatically, on the control medium that records the program punched tape or other automatically. Yi Ke sends numerical control the system directly by communication interface, control machine tool undertakes the country is versed in. The greater part that the to program that data dominates machine treat with courtesy works is sent or one is calculated by the ground machine the method that finished method calls automatic process designing. CNC Milling CNC Machining