DMIS - Slot Parameters
DMIS Slot parameters
Written by CMM Quarterly
What makes up a slot in the DMIS code? Below is the parameter to create a slot.
Syntax:
F(name)=FEAT/CPARLN,dir,type,coord,x(r),y(a),z(h),i1,j1,k1,i2,j2,k2,len,wid
DMIS - Sensor Setting
An excerpt from the DMIS Handbook. Learn how to write programs in DMIS. This book will help you master the DMIS Language. Sensors Settings.
An excerpt from the DMIS Handbook. Learn how to write programs in DMIS. This book will help you master the DMIS Language.
In these DMIS articles we will start with the basics and move to more complex DMIS statements
Syntax:
SNSET/setting_type (,reference), value
DMIS syntax at the beginning of a program.
SNSET/APPRCH, 5.0000, ON
SNSET/RETRCT, 5.0000, ON
SNSET/SEARCH, 50.0000
SNSET/DEPTH, 3.0000, 3.0000
SNSET/CLRSRF, 30.0000
Again, your software input may look different, but it is shown here to demonstrate how a CMM software allows the input that will be written in the DMIS code.
APPRCH
Approach controls the distance from a feature nominal that the CMM will depart the POSVEL (Position Velocity) and move into MESVEL (Measurement Velocity).
SEARCH
Search controls how far the CMM will search for a touch point along the normal vector set in the nominal feature statement.
RETRCT
Retract controls the distance the probe will move away from a probed touch point.
Here we changed the retract to 8mm with a 5 mm approach
Care must be taken in a diameter, slot, etc..., any feature with an opposing wall so that either the approach or the retract will not the wall.
CLRSRF
CLRSRF – provides the clearance plane height for the stylus to travel to the next feature.
CLRSRF
Green - Path with reference
Red - Path without reference
Yellow - CLRSRF
Example:
SNSET/CLRSRF, 30.0000
Sets the clearance surface height to 30mm
This is an easy way to understand CMM programming in native DMIS. Learn the secrets to higher level DMIS programming with the DMIS Handbook. Be sure and view the table of contents to see the wealth of information included in this book. This is a digital .pdf version available for download at checkout.
Indexing Head with Cylinder or Disc Tip
DMIS statement for creating a cylinder or disc tip.
An excerpt from the DMIS Handbook
DMIS statement for creating a cylinder or disc tip.
Syntax:
S(name)=SNSDEF/PROBE,type,POL,rot1(A),rot2(B),i, j, k, len ,dia, tip(,value)
Example:
S(DISK1)=SNSDEF/PROBE,FIXED,POL,0,0,0,0,1,115,12,DISC,3
The above defines a disc tip (DISK1) that is a fixed probe with a angular rotation of 0/0. The mounting vector is 0, 0, 1 with a length (from pivot center to the tip center) of 115.
The disc diameter is 12mm with a 3mm thickness.
Note: discs and cylinder tips should be used bi-directional, in other words normal to a work plane and not 3 dimensional as a sphere tip would be used.
POINT - Mid Point
A mid point construction consists of the point to be created and the names of two other measured, constructed, or defined features or feature definitions. The mid-point will be the center of a 3D line between the centers of the 2 features used in the construction.
A mid point construction consists of the point to be created and the names of two other measured, constructed, or defined features or feature definitions. The mid-point will be the center of a 3D line between the centers of the 2 features used in the construction.
Syntax:
CONST/POINT,F(name),MIDPT,FA(name), F(name)
or
CONST/POINT,F(name),MIDPT,FA(name), FA(name),
Parameters
F(name),
Defined name of the point being constructed
MIDPT
The point will be constructed as the mid-point between 2 features
F(name), or FA(name
Name of previous measured, constructed, or defined features
Example:
F(PT5)=FEAT/POINT, CART, 118.7147, 81.4480, -18.2692, 0.0000, 0.0000, 1.0000
CONST/POINT, F(PT5), MIDPT, FA(PT3), FA(PT4)
DMIS Language Syntax
DMIS Language Syntax
DMIS is a programming language that allows programs to be read and modified by programmers. These programs are stand alone and should contain everything that would allow a programmer to execute the program.
DMIS dictates that each measurement feature be defined by the nominal parameters. These are derived from the blueprint or extracted from the CAD model.
Everything in DMIS must be defined such as sensors, datums, etc…
DMIS requires that all measurements are of a feature type and that these features must be defined before being measured or constructed. Before you can measure a feature you must first define the feature nominal parameters. For instance, in you want to measure a circle, you must first define the nominal position, direction and size and give it a name you will use when you issue a command to measure the feature.
What is DMIS?
DMIS is an information exchange standard published with the International Organization for Standardization (ISO). DMIS defines measurement process plan information for CMMs. Because DMIS is both human readable and computer readable (such as C++ or Java), it can be called a programming language for CMMs.
DMIS is an information exchange standard published with the International Organization for Standardization (ISO). DMIS defines measurement process plan information for CMMs. Because DMIS is both human readable and computer readable (such as C++ or Java), it can be called a programming language for CMMs. DMIS is a language, which means that software implementing DMIS must be able to encode DMIS or decode DMIS. Like any information exchange standard, this standard is intended to enable interoperability by allowing the use of DMIS programs, without alteration, on many types and brands of CMMs.
DMIS is written to control many types of CMMs, including computer numerically controlled (CNC), manual, classic touch-trigger, touch scanned, noncontact scanned, five-axis scanned and CMMs with rotary tables. Portable CMMs are typically not addressed by DMIS, including articulated-arm CMMs, laser trackers, white-light scanners, theodolites and robotic CMMs.
Because DMIS is so large and there are so many different functional applications, such as prismatic and thin walled, DMIS developers have defined conformance classes, which are essential for interoperability.
There are two common uses for DMIS:
Dimensional measurement planning software presents the metrologist with a 3-D computer-aided-design (CAD) model of the part to be measured and provides software tools to choose which features are to be measured and how they are to be measured-including specification of sensor types, sensor paths and distribution of points. The automatic output of the software is a measurement program encoded in DMIS.
The metrologist writes a DMIS program by hand and may debug it using a simulator.
In both scenarios, the measurement execution software then decodes the DMIS program and executes it on a CMM.
John Horst
DMIS Language Syntax
DMIS is a programming language that allows programs to be read and modified by programmers. These programs are stand alone and should contain everything that would allow a programmer to execute the program.
DMIS dictates that each measurement feature be defined by the nominal parameters. These are derived from the blueprint or extracted from the CAD model.
Everything in DMIS must be defined such as sensors, datums, etc…
DMIS requires that all measurements are of a feature type and that these features must be defined before being measured or constructed. Before you can measure a feature you must first define the feature nominal parameters. For instance, in you want to measure a circle, you must first define the nominal position, direction and size and give it a name you will use when you issue a command to measure the feature.
DMIS Command
Structure of a DMIS Command
In this book we will color code the statement(s) to help define the MAJORWORDS, MINORWORDS, and Parameters.
(name of variable=) MAJORWORD/ MINORWORD(S) and/or (parameter(s))
The example above shows the general syntax of a DMIS command or statement. If the command is an assignment it will start with the DMIS element/ name or variable followed by the equals sign and the MAJORWORD (identifies the command). If the command is not
an assignment it will start with a MAJORWORD that identifies the command. In all cases, the MAJORWORD will be followed by a forward slash which will be followed by MINORWORDS and/or parameters.
General Information:
Define the feature nominal. After the feature is measured the results are shown as FA() inside the parathesis will be the feature name or label.
