Glossary
  • Knowledgebase
  • Glossary

    A
    • AIMS

      AIMS stands for "Advanced Integrated Mathematical System".

      It is a standard for Lockheed and the Joint Strike Fighter program for data interaction between CAD and measurement systems. It uses PC-DMIS's DCI capabilties to accomplish seamless data transfer from the AIMS database to PC-DMIS.

      See also:
      Wilcox To Create Interface for Lockheed


      (Topic ID 16101-258)

    • ANSI

      Stands for American National Standards Institute which oversees the development of standards for services, processes, and systems.  Visit www.ansi.org

      (Topic ID 16101-768)

    • API

      PC-DMIS has an API (application program interface) which is frequently referred to as an automation interface.  It is for advanced control of PC-DMIS in automation systems such as robot integrations, pallet system integrations.

      (Topic ID 16101-260)

    • AS9102

      AS9102 is an aerospace specification that governs the documentation for first article reports.  

      Visit http://standards.sae.org/as9102/ for more information.

      And this FAQ is helpful as well: www.sae.org/aaqg/publications/as9102-faq.doc

       

      Hexagon Metrology has an automated tool for AS9102 reporting information called the AS9102 Reporting Module

      (See AS9102 Reporting Module).

      (Topic ID 16101-105)

    • Aircraft Coordinate System

      Aircraft Coordinate System simply refers to a coordinate system that is for an entire aircraft. It is the coordinate system used to define all parts locations to a single point on the aircraft. Each part might have a local coordinate system that has offsets to the aircraft coordinates. Automotive has a similar concept called body coordinates.

      (Topic ID 16101-259)

    • Alias

      A text description associated with a variable.

      (Topic ID 16101-855)

    • Alignment

      Arrangement in correct relative position.  There are many types of alignments, such as 3-2-1, best-fit and iterative.

      This webinar demonstrates a quick alignment using CAD in PC-DMIS: CAD Alignment Webinar

      Need to know more?  Sign up for PC-DMIS Alignments 101 on the HexagonMetrologyU website.

      (Topic ID 16101-50)

    • Assignable Cause

      A specific event that produces abnormal variation in a process. 

      (Topic ID 16101-826)

    • Attribute

      A quality characteristic that is evaluated according to a limited number of possible outcomes (usually two, such as "go/no go" or "acceptable/unacceptable" or a count of defects such as the number of scratches).

      (Topic ID 16101-854)

    • Axis

      An axis is essentially a line.  It is most often used to describe one of the three mutually perpendicular lines that make up a coordinate system.

      (Topic ID 16101-261)

    Top
    B
    • Basic Dimension

      A theoretically exact dimension, given from a datum to a feature of interest in a technical drawing.  Basic dimensions represent an ideal case and as such, have no tolerance. 

      (Topic ID 16101-767)

    • Best-fit

      Best-fit is a term used to describe a number of different operations in metrology software that generally "fit" actual data to nominal data. The word "fit" in this case means to transform the coordinate system of the actual data by an amount that minimizes the deviation of the the actual set against the nominal set (or CAD).

      Intuitively this can be thought of as "assembling" the two data sets together, or overlaying them so that they look like they are the same.

      In alignment terms it can also be called "freeform alignment".

      (Topic ID 16101-63)

    • Blade

      A blade is also known as an airfoil.  It is a part of a machine that redirects air in a certain way in order to convert mechanical energy into some other form.  A collection of blades machined into one piece is often called a blisk.


      Hexagon Manufacturing Intelligence has multiple Blade solutions including: PC-DMIS Blade and Ultimate Blade for Quindos.


      (Topic ID 16101-112)

    • BladeRunner BladeRunner is the GUI for PC-DMIS Blade. It manages the interaction between PC-DMIS, Blade, and the operator.
      More about Blade here.

      (Topic ID 16101-1364)
    • Blueprint

      A drawing that defines the dimensions that an object or part should need to be considered a good part.  Some of the things you may see on a blueprint include:

      1. Dimensions
      2. Tolerances
      3. Reference Dimensions
      4. Basic Dimensions
      5. Datum targets

       

      To learn more about blueprints, see Hexagon Metrology's Blueprint Interpretation elearning course.


      (Topic ID 16101-776)

    • Breakpoint

      A programming technique in PC-DMIS to stop the execution of the part program so the programmer can step through the code line by line to carefully check the execution.  They are especially helpful in slowing down fast paced actions to a manageable pace.

      (Topic ID 16101-733)

    Top
    C
    • CAD

      CAD stands for Computer Aided Design.

      PC-DMIS uses CAD to create nominal geometry for comparison. PC-DMIS was the first CMM software to use CAD.

      See What CAD systems are supported in PC-DMIS? for more information.

      (Topic ID 16101-64)

    • CAD=Part

      CAD=Part is a powerful feature of PC-DMIS that allows the user to match a CAD model with measurements taken on a machine. It is not required to use CAD=PART to use a CAD model in PC-DMIS. CAD=PART corrects the nominals in situations where you setup the PC-DMIS measurement routine in such a way that that nominals for features used in your alignments are not relative to the CAD model. CAD=PART fixes the relationship.


      Use CAD=PART in these instances:

      1. The situation where you perform a Manual alignment on machine, THEN the CAD is brought in. We now need to match model to alignment. Perform a CAD=PART right after bringing in the CAD with your cursor on or after the alignment that is equal to CAD.
      2. The part was programmed, and then at a later time a CAD model was created, and we now want to import it into the existing program.
      3. There are other more rare instances for advanced programmers, not relevant for basic programming.


      You do not need to use CAD=PART in these instances:

      1. If there is no CAD
      2. Iterative alignments
      3. Offline programming (even when brought online)
      (Topic ID 16101-312)
    • CMM

      In metrology, CMM stands for Coordinate Measuring Machine.

      To learn more about CMMs see Hexagon's CMM Fundamentals course.

      (Topic ID 16101-512)

    • COP

      Stands for Cloud of Points, which is a feature in PC-DMIS that allows the software to manipulate millions of points at a time, without slowing the system down.

      (Topic ID 16101-813)

    • CPU

      Stands for Central Processing Unit and is the ‘brains’ of the computer, where most calculations take place.


      (Topic ID 16101-766)

    • CTQ CTQ stands for Critical To Quality.  These are key measurable characteristics of a product or process whose performance standards or specification limits must be met in order to satisfy the customer. For example, they may be a certain number of points per part or feature to statistically satisfy a high degree of accuracy.

      (Topic ID 16101-1042)
    • Calibration

      Calibration is "a comparison between measurements."  Usually one is a "standard" of known measure, and the other is being tested and adjusted to that standard.

      Please sign in to view all articles related to calibration.

      If you need to get your machine calibrated, please visit the Hexagon Metrology main site for more information.

      To learn more about calibration, see PC-DMIS Probe Calibration Fundamentals on HexagonMetrologyU, or for more advanced information, PC-DMIS Probe Calibration 101.

      (Topic ID 16101-268)

    • Caliper

      A device used to measure the distance between two opposite sides of an object or feature.  Calipers can measure inner or outer dimensions with good accuracy if correct techniques are used. 

      References:

      http://mdmetric.com/tech/calipuse.pdf

      (Topic ID 16101-732)

    • Clearplane

      The clearplane (or clearance plane) function found within PC-DMIS automatically moves the probe to a user-defined distance away from the part after each hit.

      See also:

      What is a Clearance Cube?

       (Topic ID 16101-332)

    • Compensation Map

      A software compensation algorithm that compensates for minute machine geometry errors.

      (Topic ID 16101-815)

    • Concentricity

      In GD&T, concentricity is a complex tolerance used to establish a tolerance zone for the median points of a cylindrical or spherical part feature.  Concentricity is generally reserved for high-precision parts, and only when there is a need to control median points.


      (Topic ID 16101-798)

    • Conversion Factor

      An arithmetical multiplier for converting a quantity expressed in one set of units into an equivalent expressed in another.

      For example, the conversion between inches and millimeters is:

                  1 inch (in) = 25.4 millimeters (mm)

      The conversion between radians and degrees is:

                  1 radian = 180/pi (about 57.3) degrees


      (Topic ID 16101-725)

    • Coordinate System

      A location and orientation in space where X, Y, and Z locations are zero and X, Y, Z directions (I,J,K) are oriented from.  Also known as a trihedron.  

      (Topic ID 16101-861)

    Top
    D
    • DCC

      Direct Computer Control.  In this mode the machine will automatedly move and measure when commanded.  This is as opposed to manual control, where all moves are done using the handbox controller.

      This is similar to CNC (Computer Numerical Control) for machine tools.

      (Topic ID 16101-65)

    • DCI

      Stands for Direct CAD Interface.

      Instead of using translations, sometimes even two translations that other software are forced to, PC-DMIS can connect directly to your CAD package and natively work with your model.  There are no longer translation errors or data loss.

      See What CAD systems are supported in PC-DMIS? for more information.
      Related:  DCT 

       (Topic ID 16101-106)

    • DCT

      Direct CAD Translators (DCT) import CAD system models by translating the native CAD system files into PC-DMIS's internal CAD format.

      The benefits of the Direct CAD Translators compared to the Direct CAD Interfaces (DCI) are the following:

      • Installation or license of CAD system not needed.
      • Importing the CAD file is often faster.
      • Once imported, the original CAD file is not needed.
      • Working with the model in PC-DMIS is often faster.


      The disadvantages of the Direct CAD Translators compared to the Direct CAD Interfaces are the following:

      • Possibility of errors and limitations associated with translation of data from CAD systems into PC-DMIS’ internal CAD format.

      Geometry calculations performed using PC-DMIS mathematical routines, which may not be ideally suited to original CAD system representation.

      See What CAD systems are supported in PC-DMIS? for more information.

      (Topic ID 16101-170)

    • DMIS

      Dimensional Measurement Interface Specification.

      Visit the downloads section for more specific information about DMIS support.

      (Topic ID 16101-107)

    • DPD

      Stands for Digital Product Definition.  It is a term used by aerospace manufacturers to describe the act of defining a product using digital data only (typically CAD models and Inspection Plans).

      (Topic ID 16101-818)

    • Datum

      A point, line, surface, or feature used as a reference for measurements.

      (Topic ID 16101-852)

    • Degree of Freedom

      A direction in which independent motion can occur.  In most alignments, you will constrain six degrees of freedom:

           Translation in X, Y, Z

           Rotation about X, Y, Z axes



      (Topic ID 16101-742)

    • Dimension

      A measurement such as length, depth, or height.  In PC-DMIS features are created, then dimensioned.

      Some dimensions in PC-DMIS include:

      • Distance
      • Location
      • True Position
      • Straightness
      • Flatness
      • Perpendicularity

       (Topic ID 16101-853)
    • Dimensional Inspection

      The act of measurement of an object for verification of conformance to a specification.

      (Topic ID 16101-818)

    • Discrete Hit Discrete hits are individual probe-detected contact measurements. The minimum number of discrete hits for a measured circle, for example, is three. This differs from a scan measurement which may include many more hits depending on the size of the circle and the properties of the scan.

      (Topic ID 16101-1033)
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    E
    • EMS EMS stands for Enterprise Metrology Solutions.  It is the philosophy behind PC-DMIS, the standardization of software for all of metrology.
      See: PC-DMIS for more information.


       (Topic ID 16101-66)
    • EWL

      Effective Working Length.  Area from the stem to the middle of the ball (for Renishaw) or to the end of the ball for other vendors (including Hexagon).


      (Topic ID 16101-111)

    • Excel


      Excel is a commercial spreadsheet application written by Microsoft. 

      Please sign in to view all of our articles about using Excel with our metrology products.

       

      See also:

      How do I get my results into Excel?

      (Topic ID 16101-267)

    Top
    F
    • FCF

      Stands for Feature Control Frame.  The feature control frame is read from left to right and defines characteristic type, tolerance shape and value, and datum references.

       (Topic ID 16101-799)

    • Feature Extraction

      Feature extraction is a method by which a software pulls primitive geometry from a cloud of points.

      PC-DMIS has built in feature extraction for it's point cloud measurements with laser scanners.

      (Topic ID 16101-67)

    Top
    G
    • GD&T

      GD&T stands for "Geometric Dimensioning and Tolerancing".  It is a system for communicating tolerances for form fit and function.

      GD&T definition according to Wikipedia: Geometric Dimensioning and Tolerancing.

      To sign up for a GD&T training course at your nearest Hexagon MI Solution Center, please visit Hexagon Training or see Applied GD&T for PC-DMIS 201 on HexagonMetrologyU 

      Notes: Sometimes GD&T is spelled: "GDT" or "GD and T". Solution Centers were formerly called  "Precision Centers".


      (Topic ID 16101-75)

    • GR&R

      GR&R stands for "Gage Repeatability and Reproducability".

      It is a statistical tool that measures the amount of variation in the measurement system arising from the measurement device, and is a standard method for determining the performance of a measuring system. 

       (Topic ID 16101-68)

    • GUI

      Stands for Graphical User Interface which is a human-computer interface (a way for humans to interact with computers) that uses windows, icons and menus and which can be manipulated by a mouse (and often to a limited extent by a keyboard as well).


       (Topic ID 16101-794)

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    H
    • HASP

      The licensing scheme for PC-DMIS uses a HASP-type device. It is often called a portlock, or dongle.

      A HASP looks like (and is often mistaken for) a small USB drive that plugs into a USB port on your computer.

      In order to run PC-DMIS, this HASP must be plugged in. Taking the HASP out after starting PC-DMIS will lock up the software until you put the HASP back in.

      HASP is an acronym for Hardware Against Software Piracy.

       (Topic ID 16101-69)

    • HexagonMetrologyU

      HexagonMetrologyU is Hexagon Metrology's online university.  Here you can sign up for classroom or e-learning courses to expand your metrology knowledge. 

      For more information, see What is HexagonMetrologyU?

      Visit HexagonMetrologyU.


      (Topic ID 16101-497)

    Top
    I
    • IGES
      The Initial Graphics Exchange Specification (IGES) (pronounced eye-jess) is a file format which defines a vendor-neutral data format that allows the digital exchange of information among Computer-aided design (CAD) systems.

      (Topic ID 16101-801)
    • Iterative alignment

      An iterative alignment is a type of alignment that uses 6 or more features in an "iterative" process to refine the alignment to a certain target.  The iterative process uses a repetition of a sequence of operations to yield results successively closer to a true, desired result.

      (Topic ID 16101-310)

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    J
    • Jogbox

      A jogbox (sometimes called a "pendant", or a "joystick") is a electronics box, usually corded but more and more often wireless, that manually controls a DCC machine.

      Sign in and search our downloads section for jogbox for more information.



      (Topic ID 16101-490)

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    L
    • LMC

      LMC stands for: Least Material Condition. It is the opposite of MMC (Maximum Material Condition).

      (Topic ID 16101-70)

    • Least Squares

      A very common type of best fit that attempts to minimize the root mean square (square root of the sum of the squares) of the errors of a set of points against the theoretical element.  Essentially, given a set of points, the algorithm attempts to minimize the errors of the points to the feature, until the 'best' possible feature results.  It is interesting to note that least squares does not always represent the feature with the lowest form.

      (Topic ID 16101-774)

    • Level

      A step in an alignment that orients the axis requested to the vector of the feature specified.  It is important to note:

      1. This should normally be the first step in any alignment procedure.
      2. Level does not move or translate any axis; it is orientation only

      (Topic ID 16101-740)
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    M
    • MBD

      Stands for Model Based Definition.  It is typically a requirement for Boeing, but there are more companies moving to this concept.  It means that a model is the definition of the part manufacture, there are no prints.  PC-DMIS is an especially useful software to satisfy MBD requirements because of its DCI capabilities and its strong CAD engine.

      (Topic ID 16101-823)

    • MMC

      MMC stands for: Maximum Material Condition.

      It is a "Material Condition Modifier".

      Example, for a shaft, Maximum Material Condition would be the largest diameter of the shaft possible, within a given tolerance, i.e. for a shaft with a nominal diameter of 1.000 inch, +/- .010, the diameter of the shaft at MMC would be 1.010.

      On the other hand, MMC for a hole with the same nominal and tolerance would be .990.

      Further, for either of the above, both would have to be perfectly round, as one of the rules for GD&T (which is where the term Maximum Material Condition comes from), is that a feature must have perfect form at MMC. As the measured value of the feature departs from MMC, there is an increase in allowable deviation from perfect form.

      (Topic ID 16101-71)

    • Maximum Inscribed

      This is a type of circular feature calculation that creates the largest circle that will fit inside a set of points.

      (Topic ID 16101-777)

    • Mean

      The overall average value of measurements in a sample.

      (Topic ID 16101-804)

    • Mean Deviation

      The average deviation from the nominal.

      (Topic ID 16101-827)

    • Median

      The middle point of a set of data values.  Exactly 50% of the values are higher than the median and 50% of the values are lower.

      (Topic ID 16101-805)

    • Minimum Circumscribed

      This is a type of circular feature calculation that creates the smallest circle that will fit outside a set of points.

      (Topic ID 16101-779)

    • Minimum Separation

      This is a type of circular feature calculation that creates the feature with the least minimum to maximum deviation possible.  It is often called a MIN/MAX fit.

      (Topic ID 16101-778)

    • Move Speed

      The velocity of the machine when moving but not taking hits.

      (Topic ID 16101-729)

    • Moving Range

      A calculation of the ranges between groups of consecutive data points.

      (Topic ID 16101-812)

    • ms Milliseconds.  One thousandth of a second.

      .(Topic ID 16101-1032)
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    N
    • NC

      Stands for Numerical Control and typically refers to a machine tool.

      (Topic ID 16101-847)

    • NIST

      NIST stands for the National Institutes of Standards and Technology.  Their site: NIST

      To download a copy of any of our software certifications, please visit our downloads section (remember you have to sign in) and look under the "Certifications" category.

      Certain manufacturers require NIST testing as a part of their supplier certification.  That test can be downloaded here: zip NIST Setup 2012 (must be signed in to download).

      (Topic ID 16101-72)

    • Nominal

      The value to be achieved, or the value that is expected.  It is the number that the measured value is compared with for a dimension.

      (Topic ID 16101-764)

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    O
    • Operator Mode

      Operator Mode is a mode in PC-DMIS which restricts operators from editing programs, and from running anything other than PC-DMIS.

      Operator mode uses marked sets to create a routine to measure a part from a given part program.

      The most common use for this is creation of a first article part program and then using marked sets to create routines that only measure the features for that operation.

       

      See also: How do I protect my PC-DMIS programs from accidental edits?

       (Topic ID 16101-73)

    • Origin

      An origin is a location in space where all axes (X, Y, Z) are zero. 

      (Topic ID 16101-726)

    • Outlier

      A data point that falls beyond a calculated limit.

      (Topic ID 16101-810)

    Top
    P
    • PAS

      Stands for Product Acceptance Software and is a requirement of AS9100.

      (Topic ID 16101-820)

    • PC-DMIS

      Direct from Hexagon Manufacturing Intelligence: PC-DMIS is the world's most popular CMM software for the collection, evaluation, management and presentation of manufacturing data. Our software is standard on Hexagon Metrology measurement devices and is also available on a wide range of non-Hexagon equipment. Use it to fully leverage your manufacturing process and build truly lean systems.

      The name "PC-DMIS" comes from the concatenation of two acronyms:

      PC stands for "Personal Computer"

      DMIS stands for "Dimensional Measurement Interface Specification".

      (Topic ID 16101-577)

    • PDF

      PDF is an acronym for "Portable Document Format". It was intended to represent documents independent of computer software and hardware.

      Please sign in to find support information for PDF documents used with our metrology equipment.

      (Topic ID 16101-269)

    • PRBRDV PRBRDV is an acronym for "Probe Radial Deviation". This is the deviation type used for discrete hit measurement.

      (Topic ID 16101-1029)
    • PTB

      PTB stands for Physikalisch-Technische Bundesanstalt, a software certification organization based in Germany.

      Site: PTB

      To download a copy of any of our software certifications, please visit our downloads section (remember you have to sign in) and look under the "Certifications" category.

      (Topic ID 16101-207)

    • Parametric Programming

      A type of inspection routine that allows multiple uses of the routine over a variety of part configurations.  This is often called "HLL" (high level language or high level logic) in other software, and is a standard option in PC-DMIS and Quindos.

      Resources for Parametric Programming 

      • Hexagon MI offers a Level 3 PC-DMIS class, which reviews concepts necessary for parametric programming.  Visit HexagonMetrologyU to find out more: PC-DMIS 301
      • Our user's forum is chock full of advice, and advanced level users who discuss various metrology topics, and tips and tricks that include high level programming.  Visit the PC-DMIS Forum
      • Our applications team can assist you with your first parametric program.  Call 855-4-HEXMET to see how we can help you.  More information here as well: Programming Services
      (Topic ID 16101-74)
    • Part Program

      A sequence of steps that PC-DMIS can save into a file on your computer.  It will have the extension ".PRG".  

      Also known as measuring plans, measurement plan, measurement routine, inspection routines, learn sequence, or inspection plan.


      (Topic ID 16101-851)

    • Pitch

      Pitch is the "lead" of a screw. It is defined as the measurement of the distance from the crown of one thread to the next. Enter this value in PC-DMIS to have it follow the thread in a threaded hole

      Pitch can also be the tooth to tooth distance in Gear Measurements.

      (Topic ID 16101-333)

    • Plane

      A flat surface on which a straight line joining any two points on it would wholly lie.


      (Topic ID 16101-862)

    • Portable Measuring Arms

      Portable measuring arms allow you measure on the machine or shop floor. They feature no homing procedures, simplicity of operation and reliable 3D measurements. Articulated arms can be equipped with different length probes and scan heads to measure even difficult-to-access points either optically or by touch.

      To learn more about portable measuring arms, see Hexagon Metrology's Arm Fundamentals course.

      (Topic ID 16101-842)

    • Portlock

      See HASP

      (Topic ID 16101-338)

    • Prehit

      (also Pre-hit)

      A defined mode of behavior/movement of the machine and probe in the close proximity to the theoretical expected hit location.  The Prehit Distance is the number defined for the distance the machine travels while in this mode, as it 'searches' for the part.  The machine travels this distance at at a reduced "touch speed" while approaching a part to take a hit with the probe.

      (Topic ID 16101-727)

    • Prismatic

      A prismatic part is one in which there are two or more perpendicular surfaces, and a majority of the features could be defined as perpendicular or parallel to one or both of the surfaces.

      (Topic ID 16101-814)

    • Probe

      A device attached to a CMM that is used in taking measurements on a part. CMMs may have contact probes (called touch probes) or be non-contact, like a portable CMM laser scanner. 
      In PC-DMIS, a probe is generally defined as the assembly of the components from the RAM of the CMM down to the stylus tip.


      (Topic ID 16101-250)

    • Profile

      A type of dimension that specifies how much material a surface has on it.  Positive deviations specify excess material, and negative deviations specify lacking or missing material.

      (Topic ID 16101-775)

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    Q
    • QUINDOS QUINDOS stands for Quality Inspection of Dimensional Objects and Sizes.  QUINDOS (or Quindos) is a powerful software analysis tool for many types of coordinate measuring devices and differing applications. It is used in the power plant, automotive, aircraft and machine tool powertrain industries, just to name a few. The database structure contains all of the measurement data, making it available for further processing and reporting. A host of very special functions improves the efficiency of measuring process.  More info here: http://hexagonmi.com/products/software/quindos

      (Topic ID 16101-1097)
    • Quality Characteristic

      Any aspect of a product for which quality must be monitored and controlled.

      (Topic ID 16101-856)

    • Query

      A request for information from a database.

      (Topic ID 16101-857)

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    R
    • RFS

      RFS stands for: Regardless of Feature Size.  It is a function of GD&T.

      (Topic ID 16101-75)

       

    • Random Error

      An error in measurement caused by factors that vary from one measurement to another.

      (Topic ID 16101-822)

    • Range

      The difference between the high and low values of a set of data.

      (Topic ID 16101-809)

    • Reference Dimension

      A dimension on an engineering drawing provided for information only.  Reference dimensions are provided for a variety of reasons and are often an accumulation of other dimensions that are defined elsewhere.


      (Topic ID 16101-765)

    • Repeatability

      The variation in measurements that occurs when one operator uses the same gage for measuring identical characteristics of the same part.  Repeatability can be calculated and analyzed by using the GR&R test type.

      (Topic ID 16101-806)

    • Reproducibility

      The variation in the average of measurements made by different operators using the same gage when measuring identical characteristics of the same parts.  Reproducibility can be calculated and analyzed by using the GR&R test type.

      (Topic ID 16101-807)

    • Retract

      Determines the distance the machine will move away from the actual hit location before going from 'Touch Speed' to 'Move Speed'.  

      Retract Distance Note: Some controllers do not retract on their own. In these cases, PC-DMIS issues the move to do the retract, and the distance is based on ball surface to the part's theoretical hit location. If the controller does do the retract, the distance may be calculated either from the ball surface or the ball center to either the theoretical or measured hit location, depending on the particular controller.

      (Topic ID 16101-731)

    • Retrofit

      To add (a component or accessory) to something that did not have it when manufactured.

      PC-DMIS can be retrofitted to many types of CMMs (more than most any other CMM software).

      (Topic ID 16101-817)

    • Reverse Engineering

      The act of measuring an unknown part (dimensions not known) and creating a method by which the part can be reproduced.

      (Topic ID 16101-763)

    • Rotate

      A step in an alignment where the secondary axis of a coordinate system is rotated to match the vector of a feature.  It constrains one degree of freedom.  It is important to note:

      1. This should normally be the second step in an alignment procedure.
      2. Rotate does not move or translate any axis; it is orientation only.

      (Topic ID 16101-741)
    Top
    S
    • SCNRDV SCNRDV is an acronym for "Scan Radial Deviation". This is the deviation type used for scan-type measurements.

      (Topic ID 16101-1030)
    • SPC

      SPC stands for Statistical Process Control.  Hexagon Metrology supplies Datapage+ to handle a companies statistical needs automatedly.

      (Topic ID 16101-77)

    • Skewness

      A distribution statistic that provides a measure of asymmetry.  Negative values indicate data is skewed to the left (there are more values that are less than the mean than values that are greater than the mean).  Positive values indicate the data is skewed to the right (there are more values that are greater than the mean).

      (Topic ID 16101-811)

    • Standard Deviation

      In statistics and probability, the standard deviation measures the amount of variation or dispersion from the average in a set of data.

      (Topic ID 16101-739)

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    T
    • TTP TTP is short for Touch Trigger Probe.  Touch-trigger probes are used to measure discrete points. They are ideal for accurate and precise inspection of 3-dimensional parts.


      http://www.hexagonmetrology.us/products/probing-systems-styli/cmm-touch-trigger-probes


      (Topic ID 16101-1031)
    • Temperature

      Temperature is a physical property of matter that expresses how "hot" or "cold" something is.  In metrology we are concerned with temperature due to it's measureable effect on the dimensions of parts.

      Sign in to see all of our articles and support information about temperature.

      (Topic ID 16101-270)

    • Temperature Compensation

      Correction of measurement results for errors in temperature that cause variations in part size, and measurement equipment geometry and results.

       

      See also (may require login):

      Temperature

      pdf Temperature Compensation

      pdf Temperature Part Origin Justification

      pdf M1S606EB - Thermal Compensation of the Part


      (Topic ID 16101-386)

    • Tolerance

      The acceptable amount of deviation from the nominal.  Upper and lower tolerances are set for each variable and are added to the nominal value to produce the upper and lower specification limits.  

      (Topic ID 16101-803)

    • Touch Speed

      The speed at which the machine will travel during the prehit distance (the approach to the part).

      (Topic ID 16101-728)

    • Transaction

      Each time a part is measured, the measured values are stored in a transaction.

      (Topic ID 16101-808)

    • Translate To translate in measurement terms, is to move a coordinate system by a set amount.

      (Topic ID 16101-78)
    • True Position The perfect position of a feature per design specifications.

      (Topic ID 16101-81)
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    V
    • VPN

      Stands for Virtual Private Network, which extends a private network across a public network.  

       (Topic ID 16101-824)

    • Validation

      To give official sanction, confirmation, or approval to.  Validation of measurement and test methods (procedures) is generally necessary to demonstrate that the methods are suitable for the intended use.

      (Topic ID 16101-821)

    • Vector

      Vectors are a mathematical representation of direction.

      PC-DMIS automatically calculates vectors in most normal operations. It is however useful to know something about vectors when working with advanced programming techniques.

      To learn more about vectors and more advanced mathematical concepts, check out Math for PC-DMIS 201 on the HexagonMetrologyU website

      (Topic ID 16101-79)

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    W
    • Workplane

      The WORKPLANE command specifies the plane for all 2D measurements. In cases where a feature or dimension is 2D, WORKPLANE specifies the plane in which the feature or dimension will reside. Intuitively it is the plane of the view on the print in which your feature or dimension lies in.

      WORKPLANE's also affect how Copy and Paste With Pattern work. If you do not have the WORKPLANE set properly for the orientation that you want the pattern pasted in, you may get some unexpected results. For example: If you have a hole pattern where the normals for the holes would point toward Y-Plus, but your current WORKPLANE is set to Z-Plus, if you attempt to Copy and Paste With Pattern the initial holes in the pattern, PC-DMIS will do so, but with the holes oriented with their normals pointed toward Z-Plus, instead of toward Y-Plus as they should be. To avoid this problem, in your program, set the correct WORKPLANE just before the holes you plan to Copy and Paste With Pattern.

      (Topic ID 16101-80)

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    X
    • Xact Measure

      A style version of GD&T implemented in PC-DMIS.  It uses a simplified graphical interface for the user to choose their options for GD&T.

      (Topic ID 16101-730)

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