CNC PROGRAMMING PDF
Looking for CNC Programming, CNC Machine Programming, CNC G-Codes, or Examples in pdf form to download and study? As great as the world wide web is, . Cartesian Coordinate System. 7. Machines Using CNC. 9. Programming Systems . Point-to-Point or Continuous Path. Point-to-Point Positioning. Fax: +44 (0) Email: [email protected] G and M. Programming for CNC. Milling Machines. COMPUTERISED MACHINES AND SYSTEMS.
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PDF Drive is your search engine for PDF files. The CNC Enhanced Learning System includes the CNC Programming Student Workbook and a DVD. CNC Programming. CAD/CAM course | MSc. Production Engineering | By: Dr. Laith Abdullah Mohammed. Department of Production Engineering & Metallurgy, . Introduction & CNC Process. Overview .. CNC Programming Language. Overview. Read the Reading Assignment for each lesson (PDF). • Watch the video.
Therefore, they do not help in teaching the fundamentals of CNC programming. My company Cadem strongly believes in doing its best to bridge the gap between education and industry, and consistently works on a lot of initiatives to achieve this. This handbook and the attendant material is one such initiative, to provide a clear set of training material to teach CNC programming effectively. This handbook comes free of cost to you.
You can print and use it, or freely distribute soft copies. Table of Contents Program format Pr ogr a m for m a t Program form at s and com m ands explained in t his chapt er relat e t o t he Fanuc 0iT cont roller.
A CNC program consist s of a num ber of lines, called blocks. Each block cont ains a num ber of com m ands. Block for m a t G01 X A block consist s of a set of words. Each word is a com m and. A word consist s of an alphabet called t he address, followed by a num ber.
I n X Ot her t han coordinat es, t he m ost com m only used words in a program are t he G- codes and M- codes. G codes m ost ly involve t ool m ot ion com m ands like rapid m ot ion, feed m ot ion, circular m ot ion, dwell, and canned cycle codes. Coor din a t e syst e m Ax e s con ve n t ion The Z axis is along t he spindle, while t he X axis is perpendicular t o it. The program zero is t he int ersect ion of t hese axes.
All coordinat es in a program are referenced from t his point. Axes on a lat he Z is along t he part axis and X is norm al t o it. Absolu t e , in cr e m e n t a l coor din a t e s I n Absolut e program m ing t he end point of a m ot ion is program m ed wit h reference t o t he program zero point.
Coordinat es are specified as X,Z. X coordinat e is t he diam et er of t he part. I n I ncrem ent al program m ing t he end point is specified wit h reference t o t he current t ool posit ion. Coordinat es are specified as U,W. U is t he increm ent al diam et er of t he part. Not e: All exam ples in t his chapt er are in absolut e m ode.
Ba sic m ot ion com m a n ds G0 0 - Ra pid t r a ve r se When t he t ool is m oving t o a posit ion preparat ory t o execut ing a cut t ing m ot ion or when it is m oving t o t he t ool change posit ion, t he m ot ion is a essent ially a wast e of t im e and is execut ed as fast as possible.
The m ot ion is called Rapid t raverse. The t im e t aken t o execut e a rapid m ot ion is also called t he Air cut t im e.
What is the definition of CNC Programming Software?
G0 1 - Lin e a r in t e r pola t ion The t ool m oves along a st raight line in one or t wo axis sim ult aneously at a program m ed linear speed, t he feed rat e. An arc can be program m ed using it s radius or t he coordinat es of it s cent er point.
For m a t Using arc radius: Ex a m ple Arc radius program m ing: G3 2 — Th r e a din g m ot ion A t hreading m ot ion is a m ot ion along a st raight line, but is NOT a linear int erpolat ion m ot ion. The t ool m ot ion does not st art im m ediat ely when t he com m and is encount ered. I t is coordinat ed wit h t he rot at ion of t he spindle - t he t ool st art s m oving when an index pulse is received from t he spindle encoder.
This pulse occurs at a specific angular posit ion of t he spindle, once in each spindle rot at ion. This ensures t hat each t hread st art s at t he sam e angular posit ion, and each cut follows t he pat h of t he earlier cut. The Lead is t he axial dist ance t he nut advances in one revolut ion of t he screw, while t he pit ch is t he dist ance bet ween adj acent t hreads.
I n a single st art t hread t he lead is equal t o t he pit ch. When cut t ing a t hread, for every revolut ion of t he part t he t ool m oves axially by a dist ance equal t o t he Lead of t he t hread.
Ex a m ple The following program segm ent cut s a t hread of 2 m m. G00 X The G76 canned cycle is com m only used because it can cut a t hread wit h m ult iple cut s at various dept hs by specifying t he pit ch, t hread dept h, et c.
G0 4 — D w e ll A dwell com m and result s in a t em porary st oppage of all axis m ot ions for a specified durat ion. The spindle m ot ion is not affect ed.
I t is t ypically used when t he t ool has reached t he final posit ion in an operat ion and needs t o st ay t here for a few spindle rot at ions t o obt ain good dim ensional accuracy or surface finish. For exam ple, in a grooving operat ion when t he t ool reaches t he bot t om of t he groove it needs t o st ay t here for at least one full revolut ion. Wit hout a dwell it would ret ract back inst ant aneously and result in a non- circular cross sect ion at t he groove bot t om.
Ex a m ple G04 X1. Spin dle r ot a t ion Spindle rot at ion is st art ed by specifying a spindle direct ion com m and and a spindle speed com m and.
Spindle direct ion: This is specified by an M code. Spindle clockwise CW M Spindle count er- clockwise CCW M Spindle st op Spindle speed: The spindle speed is specified eit her as a const ant surface speed or as a const ant spindle speed.
Con st a n t su r fa ce spe e d This is com m anded by G96, and is always accom panied by a lim it ing spindle speed com m and G Exam ple: The second one com m ands a lim it ing spindle speed of RPM. Con st a n t spin dle spe e d This is com m anded by G Const ant spindle speed is used in t hreading and drilling, while const ant surface speed is used in all ot her operat ions. Tool ch a n ge The t ool change com m and includes t he t ool num ber and t he t ool offset num ber of t he com m anded t ool.
When t he com m and is execut ed, t he t ool changer causes t he com m anded t ool t o com e t o t he cut t ing posit ion. For m a t Taabb aa is t he t ool num ber bb is t he t ool offset num ber. The t ool num ber and offset num ber m ust be writ t en wit h leading zeros. Ex a m ple T This m eans t ool num ber 3 and offset num ber 3. The second line is t he program num ber, writ t en as Onnnn.
En d The last but one line is t he program end com m and M02 or M Block n u m be r s Block num bers add clarit y t o t he program. They can be om it t ed from all blocks or included in som e blocks only. Quit e oft en block num bers are used only in t ool change blocks. The leading zero is opt ional. They can be operat ion nam es, t ool nam es, inst ruct ions t o t he operat or, et c. Com m ent s are insert ed wit hin bracket s. Wit hout com m ent s a program is j ust a m ass of alphabet s and num bers and you cannot figure out what each sect ion of t he program is doing.
A com m ent can be in a separat e block by it self, or aft er a set of com m ands, as shown below. Here G01 and F are m odal, and need not be repeat ed in every block. G01 rem ains act ive t ill it is changed by G The block aft er G00 has it , but here F need not be repeat ed. The blocks can be writ t en as: G01 X G00 Z2.
When you com m and t he t ool t o m ove t o a posit ion, you are act ually com m anding t he Theoret ical Tool Tip TTT t o m ove t o t he posit ion. When doing an operat ion like cont our t urning, you j ust program t he cont our according t o t he coordinat es in t he part drawing. This causes t he TTT point m oves along t he com m anded pat h.
TTT m oving along cont our This is t he point on t he t ool t hat is used as t he reference point for det erm ining t ool offset s. N e ce ssit y of TN RC As t he t ool m oves along t he program m ed cont our, t he point on t he t ool nose radius t hat is act ually doing t he cut t ing keeps changing. We act ually need t he nose radius t o be t angent ial t o t he part cont our at t he point where it is cut t ing, but m oving t he Theoret ical Tool Tip TTT along t he cont our does not ensure t his.
As a result , t he t ool leaves unm achined m at erial in som e areas P1 t o P2 in pict ure and digs int o t he m at erial in som e areas P3 t o P4 in pict ure.
Tool pat h wit hout TNRC To get an accurat e cont our during m achining, an alt ernat e t ool pat h is generat ed such t hat t he nose radius is t angent ial t o t he cont our. Com pe n sa t ion com m a n ds The com pensat ed t ool pat h m ust be eit her t o t he left or t he right of t he t ool pat h program m ed wit h t he coordinat es from t he part drawing.
The direct ion of com pensat ion depends on t he direct ion of m ot ion and whet her t he t ool is cut t ing on t he inside or out side of t he part. I n t he program you can specify whet her t he com pensat ion m ust be t o t he left or right , and t he cont roller det erm ines t he com pensat ed t ool pat h.
The t ool nose radius t oo m ust be specified in a separat e area of t he m em ory. Program t o m ove along t he cont our in t he part red lines in t he pict ure indicat e rapid t raverse, and blue lines linear int erpolat ion.
Su bpr ogr a m s A t ool pat h pat t ern t hat is repeat ed can be st ored as a subprogram and called m ult iple t im es. Using a subprogram reduces t he program lengt h and program m ing t im e, and m akes t he program m ore readable.
A subprogram looks like a norm al program , but is t erm inat ed wit h an M99 com m and at t he end inst ead of M02 or M I t is called from t he m ain program by a subprogram call com m and. For m a t Subprogram call: This com m and calls subprogram , 5 t im es. I f a subprogram is only called once, t he aaa param et er can be om it t ed. The t ool pat h at each groove is: Move at rapid t o t he st art posit ion of t he groove in Z 2.
Feed int o t he groove. Rapid out of t he groove 4. Rapid sideways t o t he st art point of t he next cut.
MEC325 LN08 - CNC Programming.pdf - CNC Programming MEC 325...
Rapid out of t he groove The program segm ent t o cut t he grooves would look like t his t he t ext in bracket s is com m ent s, and t his is exact ly how you can insert com m ent s in an act ual program: This segm ent can be put in a subprogram t hat is called 5 t im es from t he m ain program.
The m ain program and subprogram can be writ t en like t his: Main program: Ca n n e d Cycle s — sin gle cu t A single cut canned cycle execut es a sequence of m ot ions required t o perform a cut — rapid approach t o t he st art posit ion, cut t ing m ot ion, and rapid depart ure. A single block replaces 4 m ot ions - 1 cut t ing and 3 rapid. Operat ions norm ally involve t he rem oval of m at erial in m ult iple cut s, so t hese cycles are seldom used.
The m ult i- cut canned cycles are t he ones generally used. International Journal of Computer Integrated Manufacturing, , 19 4 : — Tool path generation and tolerance analysis for free-form surfaces [J]. A method for designing CAM system based on features and knowledge base [J]. Journal of Northwestern Polytechnical University, , 18 1 : 83— The research of fundamental enabled technologies for KBE system in nc programming [J].
Journal of Central South University, , 19 12 : — Development of tool-path generation module for 5-axis control machining of impellers [J]. Computer Engineering, , 29 4 : — Abductive case-based reasoning [J]. International Journal of Intelligent Systems, , 20 9 : — A new strategy for direct tool path generation from measured points [J]. International Journal of Production Research, , 43 5 : — Enhancing product development through knowledge-based engineering KBE A case study in the aerospace industry [J].
Journal of Manufacturing Technology Management, , 20 8 : —Com m ent s are insert ed wit hin bracket s. In a closed loop system, feedback is provided to the controller so that it can correct for errors in position, velocity, and acceleration, which can arise due to variations in load or temperature. The signs of t he finish allowances U and W are as follows. G codes m ost ly involve t ool m ot ion com m ands like rapid m ot ion, feed m ot ion, circular m ot ion, dwell, and canned cycle codes.
Fanuc Cnc Programming PDF
Cadem's products are exported to 30 countries, in 4 languages. This is similar to the manual machine tool method of clamping a micrometer onto a reference beam and adjusting the Vernier dial to zero using that object as the reference.
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