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Design for manufacturability

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459:(DFA) to reduce product manufacturing cost and increase manufacturing practicality. There are instances when this method could cause calendar delays since it consumes many hours of additional work such as the case of the need to prepare for design review presentations and documents. To address this, it is proposed that instead of periodic inspections, organizations could adopt the framework of empowerment, particularly at the stage of product development, wherein the senior management empowers the project leader to evaluate manufacturing processes and outcomes against expectations on product performance, cost, quality and development time. Experts, however, cite the necessity for the DFI because it is crucial in performance and 496:, is the need for temporary support structures for overhanging part features. Post-processing removal of these temporary support structures increases the overall cost of fabrication. Parts can be designed for additive manufacturing by eliminating or reducing the need for temporary support structures. This can be done by limiting the angle of overhanging structures to less than the limit of the given additive manufacturing machine, material, and process (for example, less than 70 degrees from vertical). 439:, the strength and stiffness of the tool which is determined in part by the length to diameter ratio of the tool will play the largest role in determining that speed. The shorter the tool is relative to its diameter the faster it can be fed through the material. A ratio of 3:1 (L:D) or under is optimum. If that ratio cannot be achieved, a solution like this depicted here can be used. For holes, the length to diameter ratio of the tools are less critical, but should still be kept under 10:1. 93: 36: 442:
There are many other types of features which are more or less expensive to machine. Generally chamfers cost less to machine than radii on outer horizontal edges. 3D interpolation is used to create radii on edges that are not on the same plane which incur 10X the cost. Undercuts are more expensive to
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Metals come in all forms. In the case of aluminum as an example, bar stock and plate are the two most common forms from which machined parts are made. The size and shape of the component may determine which form of material must be used. It is common for engineering drawings to specify one form over
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A significant contributing factor to the cost of a machined component is the geometric tolerance to which the features must be made. The tighter the tolerance required, the more expensive the component will be to machine. When designing, specify the loosest tolerance that will serve the function of
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Each operation (flip of the part) has set-up time, machine time, time to load/unload tools, time to load/unload parts, and time to create the NC program for each operation. If a part has only 1 operation, then parts only have to be loaded/unloaded once. If it has 5 operations, then load/unload time
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components company, where inspection is mandatory, there is the requirement for the suitability of the manufacturing process for inspection. Here, a mechanism is adopted such as an inspectability index, which evaluates design proposals. Another example of DFI is the concept of cumulative count of
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The low hanging fruit is minimizing the number of operations (flip of the part) to create significant savings. For example, it may take only 2 minutes to machine the face of a small part, but it will take an hour to set the machine up to do it. Or, if there are 5 operations at 1.5 hours each, but
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As semiconductor technology scales to smaller nodes, transistors and interconnects become incredibly dense and sensitive to subtle variations in the manufacturing process. These variations can lead to defects that cause chips to malfunction or degrade their performance. DFM aims to minimize the
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process in order to reduce its manufacturing costs. DFM will allow potential problems to be fixed in the design phase which is the least expensive place to address them. Other factors may affect the manufacturability such as the type of raw material, the form of the raw material, dimensional
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products in such a way that they are easy to manufacture. The concept exists in almost all engineering disciplines, but the implementation differs widely depending on the manufacturing technology. DFM describes the process of designing or engineering a product in order to facilitate the
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the other. Bar stock is generally close to 1/2 of the cost of plate on a per pound basis. So although the material form isn't directly related to the geometry of the component, cost can be removed at the design stage by specifying the least expensive form of the material.
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Lastly, the volume (number of parts to machine) plays a critical role in amortizing the set-up time, programming time and other activities into the cost of the part. In the example above, the part in quantities of 10 could cost 7–10 times the cost in quantities of 100.
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As machining is a subtractive process, the time to remove the material is a major factor in determining the machining cost. The volume and shape of the material to be removed as well as how fast the tools can be fed will determine the machining time. When using
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broadens the ability of a designer to optimize the design of a product or part (to save materials for example). Designs tailored for additive manufacturing are sometimes very different from designs tailored for machining or forming manufacturing operations.
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DFM aims to maximize yield, the percentage of chips that function correctly out of a manufactured wafer. This involves identifying critical areas of the design, adding redundancy, and implementing layout strategies that improve the likelihood of successful
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As manufacturing companies evolve and automate more and more stages of the processes, these processes tend to become cheaper. DFM is usually used to reduce these costs. For example, if a process may be done automatically by machines (i.e.
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DFM encompasses techniques to ensure chips are reliable throughout their expected lifespan. This involves analyzing how design choices impact electromigration, hot carrier injection, and other potential failure mechanisms, and designing
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Depending on various types of manufacturing processes there are set guidelines for DFM practices. These DFM guidelines help to precisely define various tolerances, rules and common manufacturing checks related to DFM.
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the component. Tolerances must be specified on a feature by feature basis. There are creative ways to engineer components with lower tolerances that still perform as well as ones with higher tolerances.
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In addition, due to some size constraints of additive manufacturing machines, sometimes the related bigger designs are split into smaller sections with self-assembly features or fasteners locators.
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are easy to machine, although additions of fiberglass or carbon fiber can reduce the machinability. Plastics that are particularly soft and gummy may have machinability problems of their own.
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The objective is to design for lower cost. The cost is driven by time, so the design must minimize the time required to not just machine (remove the material), but also the set-up time of the
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DFM is essential for the successful and cost-effective production of advanced semiconductor devices. By proactively addressing manufacturability issues during the design stage, DFM leads to:
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design process, DFM leads to a set of design guidelines that attempt to ensure manufacturability. By doing so, probable production problems may be addressed during the design stage.
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Design for Manufacturability & Concurrent Engineering: How to Design for Low Cost, Design in High Quality, Design for Lean Manufacture, and Design Quickly for Fast Production
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Foundries provide detailed design rules that specify minimum dimensions, spacing, and other geometrical constraints that must be adhered to for successful fabrication. DFM-aware
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conforming chart (CCC chart), which is applied in inspection and maintenance planning for systems where different types of inspection and maintenance are available.
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Typically, the law of diminishing returns presents itself at volumes of 100–300 because set-up times, custom tooling and fixturing can be amortized into the noise.
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Ideally, DFM guidelines take into account the processes and capabilities of the manufacturing industry. Therefore, DFM is constantly evolving.
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Owusu-Boahen, Kwame; Han, Chang (Carl); Hsueh, Ching; Kim, Chulwoo (Jake); Vijayakumar, Arun; Devender, Fnu; Moreau, David J. (2021-02-22).
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Adding non-functional geometrical shapes to empty areas of a layout to improve pattern density and minimize local manufacturing variations.
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A thorough design rule check (DRC) and layout vs. schematic (LVS) verification is performed to ensure the design is ready for fabrication.
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Using statistical models to predict how design and process variations impact yield, allowing for informed design modification.
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Adding extra transistors or circuit elements to critical paths, so if one element fails, the chip can still function.
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During this stage, techniques like fill insertion and OPC are applied to the design for manufacturing optimization.
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Designers use DFM-aware tools that automatically check for rule violations and potential manufacturability issues.
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can only approach the part from a single direction. One side must be machined at a time (called an operation or
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Verification processes include extensive DFM checks to ensure the design meets all manufacturing requirements.
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A survey of the field of EDA. The above summary was derived, with permission, from Volume II, Chapter 19,
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A subset of design rules that are more conservative than standard rules, offering higher manufacturability.
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Semiconductor Design for Manufacturing (DFM) is a comprehensive set of principles and techniques used in
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only 30 minutes total machine time, then 7.5 hours is charged for just 30 minutes of machining.
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Modifying mask patterns to compensate for distortions that occur during the lithography process.
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component placement and soldering), such process is likely to be cheaper than doing so by hand.
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impact of these variations, improving yield and making chip manufacturing more cost-effective.
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automatically check designs against these rules, flagging potential violations for correction.
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machine. Features that require smaller tools, regardless of L:D ratio, are more expensive.
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Six Sigma Business Scorecard, Chapter 3 - Need for the Six Sigma Business Scorecard
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DFM techniques account for inherent variability in manufacturing processes such as
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Metrology, Inspection, and Process Control for Semiconductor Manufacturing XXXV
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Design for Manufacturability And Statistical Design: A Constructive Approach
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While DFM is applicable to the design process, a similar concept called
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A common characteristic of additive manufacturing methods, such as
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Some common DFM techniques used in semiconductor design include:
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Electronic Design Automation For Integrated Circuits Handbook
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Turning designs into reality: The Manufacturability paradigm
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DFM is integrated throughout the semiconductor design flow:
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Stolt, Roland; Elgh, Frederik; Andersson, Petter (2017).
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Rule-based DFM analysis for electric discharge machining
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Rule-based DFM analysis for direct metal laser sintering
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tolerances, and secondary processing such as finishing.
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SPIE. pp. 99–104. 546:Rule based DFM analysis for metal spinning 818: 111:) is the general engineering practice of 80:Learn how and when to remove this message 2526:Good Design Award (Museum of Modern Art) 750: 584: 551:Rule based DFM analysis for deep drawing 541:Rule based analysis of extrusion process 446: 353:Unless a 4th and/or 5th axis is used, a 91: 14: 2885: 938:Estimating Space ASICs Using SEER-IC/H 840:Computers & Industrial Engineering 833: 755:. Cambria, CA: CIM Press. p. 28. 2571: 2531:Good Design Award (Chicago Athenaeum) 2274: 1719: 1046: 990: 977:Design for Manufacturing and Assembly 972:Arc Design for Manufacturability Tips 775: 909:, by Lavagno, Martin, and Scheffer, 894:DFM: What is it and what will it do? 823:– via Elsevier Science Direct. 331: 29: 901:DFM: Magic Bullet or Marketing Hype 556:Rule based DFM analysis for forging 429: 24: 2572: 2475:American Institute of Graphic Arts 966:Design for manufacturing checklist 561:DFM analysis for stereolithography 25: 2929: 2485:Design and Industries Association 961:Why DFM/DFMA is Business Critical 954: 478:Design for additive manufacturing 472:Design for additive manufacturing 676: 411: 379: 136:For printed circuit boards (PCB) 96:Redesigned for manufacturability 60:has been specified. 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1021: 1014: 1013: 1006: 999: 991: 985: 984: 979: 974: 969: 963: 956: 955:External links 953: 952: 951: 935: 922: 904: 897: 888: 885: 882: 881: 846:(3): 667–676. 826: 793: 786: 768: 762:978-1878072238 761: 743: 729: 713:"Design Guide" 704: 677:Inc., eFunda. 669: 666:. August 2016. 655: 641: 634: 596: 591:Reliable Plant 576: 575: 573: 570: 569: 568: 563: 558: 553: 548: 543: 538: 533: 528: 523: 518: 513: 508: 501: 498: 476:Main article: 473: 470: 448: 445: 431: 428: 422: 419: 413: 410: 381: 378: 350: 347: 338: 335: 333: 330: 329: 328: 325: 322: 319: 307: 306: 300: 294: 288: 273: 272: 266: 260: 251: 248:Fill Patterns: 245: 233:DFM Techniques 230: 229: 222: 215: 201: 160: 157: 137: 134: 88: 87: 58:cleanup reason 42: 40: 33: 26: 9: 6: 4: 3: 2: 2930: 2919: 2916: 2914: 2913:Manufacturing 2911: 2909: 2906: 2904: 2901: 2899: 2896: 2894: 2891: 2890: 2888: 2873: 2868: 2866: 2861: 2859: 2854: 2852: 2847: 2845: 2840: 2838: 2833: 2832: 2829: 2819: 2816: 2814: 2811: 2809: 2806: 2804: 2803:specification 2801: 2799: 2796: 2794: 2791: 2789: 2786: 2784: 2781: 2779: 2776: 2774: 2771: 2769: 2766: 2764: 2761: 2759: 2756: 2754: 2751: 2749: 2746: 2744: 2741: 2739: 2736: 2734: 2731: 2729: 2726: 2722: 2719: 2717: 2716:architectural 2714: 2713: 2712: 2709: 2707: 2704: 2702: 2699: 2697: 2693: 2692: 2689: 2686: 2684: 2683:Visualization 2681: 2679: 2676: 2674: 2671: 2669: 2666: 2664: 2661: 2659: 2656: 2654: 2651: 2649: 2646: 2644: 2641: 2639: 2636: 2634: 2631: 2629: 2626: 2624: 2621: 2619: 2616: 2614: 2611: 2609: 2606: 2604: 2603:Cultural icon 2601: 2599: 2596: 2594: 2591: 2589: 2586: 2584: 2581: 2580: 2577: 2570: 2566: 2552: 2549: 2547: 2544: 2542: 2539: 2537: 2534: 2532: 2529: 2527: 2524: 2522: 2519: 2517: 2514: 2513: 2511: 2507: 2501: 2498: 2496: 2493: 2491: 2488: 2486: 2483: 2481: 2478: 2476: 2473: 2472: 2470: 2468:Organizations 2466: 2458: 2455: 2454: 2453: 2450: 2448: 2447: 2443: 2441: 2438: 2436: 2435:Design patent 2433: 2431: 2428: 2426: 2425:Design around 2423: 2421: 2418: 2417: 2415: 2409: 2403: 2400: 2398: 2395: 2393: 2390: 2388: 2385: 2383: 2380: 2378: 2375: 2373: 2370: 2368: 2365: 2363: 2360: 2358: 2355: 2353: 2350: 2348: 2345: 2341: 2338: 2336: 2333: 2332: 2331: 2328: 2326: 2323: 2321: 2318: 2316: 2313: 2311: 2308: 2307: 2305: 2303: 2299: 2295: 2287: 2285:Organizations 2284: 2281: 2278: 2277: 2273: 2269: 2259: 2256: 2254: 2251: 2249: 2246: 2244: 2241: 2239: 2236: 2234: 2231: 2229: 2226: 2224: 2221: 2219: 2216: 2214: 2211: 2209: 2206: 2204: 2201: 2199: 2196: 2194: 2191: 2189: 2186: 2184: 2180: 2179: 2174: 2171: 2170: 2169: 2166: 2164: 2161: 2159: 2156: 2152: 2149: 2148: 2147: 2146:User-centered 2144: 2142: 2139: 2137: 2134: 2130: 2127: 2126: 2125: 2122: 2120: 2117: 2115: 2112: 2110: 2107: 2105: 2102: 2100: 2097: 2095: 2094:Tableless web 2092: 2088: 2085: 2084: 2083: 2080: 2078: 2075: 2073: 2070: 2068: 2065: 2063: 2060: 2058: 2055: 2053: 2050: 2048: 2045: 2043: 2040: 2038: 2035: 2033: 2030: 2028: 2025: 2023: 2020: 2018: 2017:Participatory 2015: 2013: 2010: 2008: 2005: 2003: 2000: 1998: 1995: 1993: 1990: 1988: 1985: 1983: 1980: 1978: 1975: 1973: 1970: 1968: 1965: 1963: 1960: 1958: 1955: 1953: 1950: 1948: 1945: 1943: 1940: 1938: 1935: 1933: 1930: 1928: 1925: 1923: 1920: 1918: 1915: 1913: 1910: 1908: 1907:For Six Sigma 1905: 1903: 1900: 1898: 1895: 1893: 1890: 1888: 1885: 1883: 1880: 1878: 1875: 1871: 1868: 1867: 1866: 1863: 1861: 1858: 1856: 1853: 1851: 1850:Domain-driven 1848: 1846: 1843: 1839: 1838:architect-led 1836: 1835: 1834: 1831: 1829: 1826: 1824: 1821: 1817: 1814: 1813: 1812: 1809: 1807: 1804: 1802: 1799: 1797: 1794: 1792: 1789: 1787: 1784: 1782: 1781:Configuration 1779: 1777: 1774: 1772: 1769: 1767: 1764: 1762: 1759: 1757: 1754: 1752: 1749: 1747: 1746:Brainstorming 1744: 1742: 1739: 1737: 1734: 1732: 1729: 1728: 1725: 1718: 1714: 1700: 1697: 1695: 1692: 1690: 1687: 1685: 1682: 1680: 1679:Social design 1677: 1675: 1672: 1670: 1667: 1665: 1662: 1660: 1657: 1655: 1652: 1650: 1647: 1645: 1642: 1640: 1637: 1633: 1630: 1628: 1625: 1623: 1620: 1619: 1618: 1615: 1613: 1610: 1608: 1605: 1603: 1602:Filter design 1600: 1598: 1595: 1593: 1590: 1588: 1585: 1583: 1580: 1578: 1577:Boiler design 1575: 1573: 1570: 1568: 1565: 1564: 1562: 1560: 1551: 1545: 1542: 1540: 1537: 1535: 1532: 1530: 1529:Scenic design 1527: 1525: 1522: 1520: 1517: 1515: 1514:Floral design 1512: 1508: 1505: 1503: 1500: 1499: 1498: 1495: 1493: 1489: 1486: 1484: 1481: 1480: 1478: 1476: 1470: 1464: 1461: 1459: 1456: 1454: 1451: 1449: 1446: 1444: 1441: 1439: 1436: 1434: 1431: 1429: 1426: 1422: 1419: 1417: 1414: 1413: 1412: 1409: 1405: 1402: 1401: 1400: 1397: 1396: 1394: 1392: 1386: 1380: 1377: 1375: 1372: 1370: 1367: 1365: 1362: 1360: 1357: 1355: 1352: 1350: 1347: 1345: 1342: 1338: 1335: 1334: 1333: 1330: 1328: 1325: 1323: 1320: 1318: 1315: 1313: 1310: 1308: 1305: 1304: 1302: 1300: 1294: 1288: 1285: 1283: 1280: 1278: 1275: 1271: 1268: 1267: 1266: 1263: 1261: 1258: 1254: 1251: 1250: 1249: 1246: 1244: 1241: 1239: 1236: 1234: 1231: 1227: 1224: 1223: 1222: 1221:Garden design 1219: 1217: 1214: 1212: 1209: 1205: 1204:Passive solar 1202: 1201: 1200: 1197: 1195: 1192: 1190: 1187: 1186: 1184: 1182: 1179:Environmental 1176: 1170: 1167: 1165: 1162: 1160: 1156: 1153: 1151: 1147: 1144: 1142: 1141:Retail design 1139: 1137: 1134: 1132: 1129: 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form 409: 407: 403: 399: 395: 391: 387: 380:Material type 377: 374: 370: 366: 362: 360: 356: 346: 344: 326: 323: 320: 318:Higher yields 317: 316: 315: 312: 311: 304: 301: 298: 295: 292: 291:Verification: 289: 286: 283: 282: 281: 278: 277: 270: 267: 264: 261: 258: 256: 252: 249: 246: 243: 240: 239: 238: 235: 234: 226: 223: 219: 216: 213: 209: 205: 202: 199: 195: 193: 189: 188: 187: 186: 182: 178: 177: 173: 171: 166: 165: 156: 154: 148: 145: 143: 133: 131: 126: 122: 119: 118:manufacturing 114: 110: 106: 102: 94: 84: 81: 73: 63: 59: 53: 49: 48: 41: 32: 31: 19: 2898:Design for X 2673:STEAM fields 2643:Lean startup 2628:Indie design 2444: 2411:Intellectual 2163:Value-driven 2141:Use-centered 2047:Regenerative 2027:Policy-based 1987:Mind mapping 1901: 1892:For assembly 1833:Design–build 1751:By committee 1736:Adaptive web 1534:Sound design 1492:glass design 1490: / 1475:applied arts 1416:Level design 1287:Urban design 1238:Hotel design 1189:Architecture 1164:Video design 1157: / 1148: / 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Pro CNC 521:Six Sigma 465:aerospace 337:Objective 113:designing 2850:Wikinews 2783:paradigm 2763:language 2743:engineer 2738:elements 2728:director 2413:property 2258:thinking 2248:strategy 2233:research 2193:controls 2151:Empathic 2082:Systemic 2042:Rational 1997:New Wave 1811:Critical 1034:Designer 945:Archived 687:cite web 500:See also 402:titanium 386:aluminum 303:Signoff: 45:require 2836:Commons 2808:studies 2753:history 2721:student 2706:classic 2694:Design 2608:.design 2536:Graphex 2238:science 2228:pattern 2223:methods 2198:culture 2181:Design 1992:Modular 1845:Diffuse 1766:Closure 1488:Ceramic 1146:Signage 1029:Outline 887:Sources 614:Bibcode 285:Design: 212:etching 140:In the 47:cleanup 2813:studio 2798:review 2778:museum 2701:change 2509:Awards 2382:Sketch 2367:Mockup 2347:CAutoD 2288:Awards 2253:theory 2243:sprint 2218:marker 2183:choice 1557:& 1555:design 1391:design 1299:design 1181:design 1099:Motion 1061:design 1018:Design 931:  913:  874:  866:  784:  759:  632:  257:(OPC): 2696:brief 2583:Agile 2302:Tools 2279:Tools 1917:For X 1553:Other 1472:Other 872:S2CID 716:(PDF) 394:steel 390:brass 2773:load 2768:life 2748:firm 2335:CAID 2203:flow 2119:TRIZ 2007:Open 929:ISBN 911:ISBN 864:ISSN 782:ISBN 757:ISBN 724:2017 699:help 630:ISBN 531:DFMA 130:DFSS 2330:CAD 2310:AAD 2087:SOD 2067:RWD 1937:HCD 1404:EED 1253:EID 856:hdl 848:doi 815:doi 622:doi 355:CNC 153:SMT 142:PCB 109:DFM 107:or 56:No 2889:: 870:. 862:. 854:. 844:57 842:. 838:. 811:11 809:. 805:. 691:: 689:}} 685:{{ 628:. 620:. 589:. 400:, 396:, 388:, 359:op 210:, 1010:e 1003:t 996:v 878:. 858:: 850:: 817:: 790:. 765:. 726:. 701:) 681:. 638:. 624:: 616:: 593:. 194:: 83:) 77:( 72:) 68:( 54:. 20:)

Index

Manufacturability
cleanup
quality standards
cleanup reason
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designing
manufacturing
DFSS
PCB
SMT
integrated circuit
Design Rules
design tools
lithography
etching
Optical Proximity Correction
CNC machine
CNC
aluminum
brass
steel
stainless steel
titanium
types of plastic
milling cutters
design for inspection
design for assembly
quality control

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