The NIST RS274NGS interpreter - version 3

Krämer, Thomas; Proctor, Frederick M.; Messina, Elena R.

doi:10.6028/nist.ir.6556

Cited by 37 publications

(16 citation statements)

References 1 publication

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“…As shown in Figure 1 The canonical machining functions were devised with two objectives in mind: 4 • All the functionality of common 3-axis to 5-axis machining centers had to be covered by the functions; for any function a machining center can perform, there has to be a way to tell it to do that function.…”

Section: Interface Of Nc Program Processormentioning

confidence: 99%

An intelligent NC program processor for CNC system of machine tool

Liu

Guo

et al. 2007

Robotics and Computer-Integrated Manufacturing

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NC program interpreting is one of the most important tasks of CNC in machine tool system. The existing CNC systems only support vendor-specific NC program input, which restrict the applying of other similar functional NC programs with different program format. Especially for those users owning several machine tools with different CNC from the same provider, the diversity of NC programs dramatically increases their cost and time on operator training and machine tool maintenance. In order to deal with the variety of NC program, an intelligent NC program processor (NCPP) is proposed in this paper. The proposed NCPP has a novel structure with separated NC specification dictionary and processing engine, which ease the CNC system to adapt to a new NC program specification by only updating the NC specification dictionary (NCSD). This paper explains the NC specification dictionary structure by using EBNF representation, which is further implemented in TCL, an embedded script language tool. Meanwhile, the unchanged processing engine has been designed from a compiler's point of view to process the data dictionary. A NCPP prototype is built to evaluate the proposed design. Case study shows that the proposed NCPP handles different NC program inputs successfully.

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Section: Interface Of Nc Program Processormentioning

confidence: 99%

An intelligent NC program processor for CNC system of machine tool

Liu

Guo

et al. 2007

Robotics and Computer-Integrated Manufacturing

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“…Shpitalni et al [40] proposed to apply Taylor′s expansion around t = kT, i.e., the k-th interpolation period, to (7), which yields the relationship between the feedrate and the parameter…”

Section: Recursive Taylor′s Expansionmentioning

confidence: 99%

“…1) The original freeform surface and CC path are represented in continuous parametric form in CAD and CAM, as regulated by standards such as the initial graphics exchange specification (IGES) [6] developed by the American national standard, and the ISO 10303 standard [7] which is informally known as standard for the exchange of product model data (STEP). However, only the linear interpolation (G01) and circular interpolation (G02 and G03), which are defined in the RS274D standard [8] and the ISO 6983 standard [9][10][11] , are supported across all CNCs.…”

Section: Introductionmentioning

confidence: 99%

Toolpath Interpolation and Smoothing for Computer Numerical Control Machining of Freeform Surfaces: A Review

Zhong

Luo

Chang

et al. 2019

Int. J. Autom. Comput.

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Driven by the ever increasing demand in function integration, more and more next generation high value-added products, such as head-up displays, solar concentrators and intra-ocular-lens, etc., are designed to possess freeform (i.e., non-rotational symmetric) surfaces. The toolpath, composed of high density of short linear and circular segments, is generally used in computer numerical control (CNC) systems to machine those products. However, the discontinuity between toolpath segments leads to high-frequency fluctuation of feedrate and acceleration, which will decrease the machining efficiency and product surface finish. Driven by the ever-increasing need for high-speed high-precision machining of those products, many novel toolpath interpolation and smoothing approaches have been proposed in both academia and industry, aiming to alleviate the issues caused by the conventional toolpath representation and interpolation methods. This paper provides a comprehensive review of the state-of-the-art toolpath interpolation and smoothing approaches with systematic classifications. The advantages and disadvantages of these approaches are discussed. Possible future research directions are also offered.

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“…For over a decade, we have been building interpreters that either run machining centres (Kramer et al 1994(Kramer et al , 1995(Kramer et al , 2000 by interpreting RS274 programs (Electronic Industries Association 1979, National Center for Manufacturing Sciences 1994) or run coordinate measuring machines by interpreting dimensional measuring interface standard (DMIS) programs (ANSI/ CAM-I 2001). These interpreters are built to be subordinate to machine controllers , Horst 1999.…”

Section: Nist Interpreters and Step-ncmentioning

confidence: 99%

Run-time interpretation of STEP-NC: implementation and performance

Krämer

Proctor

et al. 2006

International Journal of Computer Integrated Manufacturing

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This paper describes an experiment in building and running two STEP-NC interpreters for milling operations: one using ISO 14649, the other using AP 238 of ISO 10303. Both use STEP part 21 exchange files as input and call low-level machine control functions. Both include tool path generators and have sufficient functionality to execute the first example program at the end of part 11 of ISO 14649. The objectives and results were: (1) to determine if ISO 14649 and AP 238 contain sufficient information to run a machining centre (yes); (2) to determine whether AP 238 faithfully remodels the information in ISO 14649 for the functionality that was implemented (yes); (3) to determine whether real-time interpretation of STEP-NC is feasible (yes); (4) to determine the burden on systems programmers to build a STEP-NC interpreter (heavy); (5) to determine how interpretation time varies with file size (linearly for both interpreters); and (6) to compare the speed with which the two formats can be interpreted. Using currently available software tools, ISO 14649 can be interpreted significantly faster, but both interpreters are so fast that interpretation time is negligible compared with running time.

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The NIST RS274NGS interpreter - version 3

Cited by 37 publications

References 1 publication

An intelligent NC program processor for CNC system of machine tool

An intelligent NC program processor for CNC system of machine tool

Toolpath Interpolation and Smoothing for Computer Numerical Control Machining of Freeform Surfaces: A Review

Run-time interpretation of STEP-NC: implementation and performance

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