CMM Handbook

The CMM Handbook Revision 5

CMM Quarterly announces the new release of The CMM Handbook Revision 5. This version comes with a CD with explanations of specific topics. Below are listed some of the topics covered in The CMM Handbook. This spiral bound handbook is a must have for all CMM programmers and operators.

Common Conversion Factors
Environment Settings
Coordinate-Measuring Machine (CMM) Probes
Touch Trigger Probes

Resistive
Strain-gauge
Piezo

Scanning Probes
Passive Sensors

Simplicity
Dynamic Response

Active Sensors

Complexity
Dynamic Response

Accuracy
CMM Stylus Selection
Stylus Variables

Stylus Sphericity (roundness)
Stylus Bending
Thermal stability
Coefficient Expansion

DMIS Probe Command Set
Measurement Uncertainty
Measurement Uncertainty and your CMM System

MPE = Maximum Permissible Error
MPEE - Maximum Permissible Error for length measurement
MPEP - Maximum Permissible Error for probing
ISO 10360-2 Where do E and P apply?
MPERONt(MZCI) - Maximum Permissible Error for form measurement (roundness)
MPETHP and MPEτ - Maximum Permissible Error for scanning probing

Projection Planes and Plane Normal Vectors
Understanding the 6 Degrees of Freedom

Using The Correct CMM Alignment Principles

Words To Be Familiar With

Alignment
Datum
Origin
Coordinate System
3-2-1 Setup
Coordinate Systems

What is a Coordinate System?
How Do I Create A Coordinate System?
Myths And Truths About Establishing Coordinate Systems
Cartesian Coordinate System
Polar Coordinate System
Spherical Coordinate System
Datum Definition When the Datum Is a Cylinder
Basic Alignment Strategies
Sample Alignments
Plane/ Line/ Line
Plane/ Line/ Point
Plane/ Circle/ Line
Plane/ Circle/ Circle
Advanced Alignment Strategies
Best-Fit Alignment
RPS Alignment
CAD Alignment

Feature Types

Circle
Cylinder
Line
2d Line
3D Line Spatial Vector
Cone
Partial Arcs
Measurement Methods
Measurement Strategies
Diameters

Filtering of Scanned Data

Data from Scanning
Filtering – What is it?
Filter Methods
Filtering Types

Direction Vectors

What Are Direction Vectors .
How To Calculate Direction Vectors
Direction Vectors for Common Angles

Gage R&R

Terminology of R&R
Variability
How to perform a Gage R&R
Gage R&R Method
The 10% Rule
Calculating Gage R&R
What If the Gage R&R Is Not Good?

DMIS Commands

General Setup Commands
Machine Settings
Operator Prompts
Sensor Select

Datum Alignment Commands

Three Step Method
One Step Method
Measurement Features
Work Plane

Trigonometry Calculations

Angle Measurement
The concept of angle
Right Hand Triangles
Oblique Triangles
How to Calculate Chord Length

Bolt Hole Circle Calculations
Create Your Own Bolt Hole Calculator in Excel

Getting Started
The Formulas

Geometric Dimensioning & Tolerancing

G,D&T Resources
G,D&T printed or web materials
G,D&T Training Companies
Datum Feature Constraints
Profile
Changes to G,D&T
New and Refined Modifiers

CAD

Data Exchange
IGES and Step
Issues When Programming From CAD
Surface Normals

CAD Modeling

The Basics
Reverse Engineering
CMM Scanning Options

Higher Level Language Examples

Common HLL Usages
Jump To
If-Then-Else Statement
Relational Operators
Call External Program
Write a program to calibrate a disc, cylinder, or shaft styli .
Save results and increment serial numbers
Write a program to query if a fixture alignment needs run .
Write a program to add date and time stamping
Write a program to add operator input

CMM Glossary

This spiral bound book sells for $115.00 plus shipping ($5.00 US, $10.00 International)

The CMM Handbook

Announcing the most comprehensive CMM Handbook. The CMM Handbook is now available. This book will put the best CMM resource material at your fingertips. Never before has this data been collected and placed in one resource book.

This book is the resource book you want in your library of books.

Click on the picture to see a sampling of the table of contents.

This book is available for $115.00 U.S. and includes shipping in the U.S. add $10.00 for international orders to cover shipping.

To purchase The CMM Handbook click on the Buy Now Button on the upper right hand panel.

DMIS Programming

Getting Started: Creating a program shell with a setup section.

This article builds on the previous overview and gives you some examples of program structure along with suggestions regarding some ‘must have’ settings to get your program underway.

Most DMIS based CMM’s provide icon based tools to create DMIS programs, however a DMIS programmer does not need CMM software to create a DMIS program. DMIS programs can be created from any text editor and the program can usually be opened by or imported into the CMM software later. It should be noted however that a text editor works well when you are measuring primitive features or making simple changes using engineering drawings but will not suffice if you need data from a CAD model in order to measure complex surfaces or simulate your measurement routines. These types of tasks are best left to a professional CMM system.

A DMIS program that does nothing:

DMISMN/’EXAMPLE OF A PROGRAM SHELL’,4.0
$$
$$
$$ this program does nothing
$$
$$
ENDFIL

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DMIS programming ... Overview.

This is the first in a series of articles describing the process of DMIS programming.

This is the first in a series of articles describing the process of DMIS programming. In future articles I will be covering specific areas of a typical DMIS program and providing actual program listings of those areas. I will try to cover the most important aspects of each area, giving the reader tips and tricks learned along the way. This first article is designed to provide an overview of the basic structure of a program and highlight the areas that any user should consider including in their program.

DMIS programs should be designed to be as portable as possible so that they can be used on different DMIS compatible CMMs. This means that all aspects of a program’s operation must be defined and the user should not assume that the CMM will take responsibility for any setting. A typical DMIS program starts with a DMIS main or module statement (DMISMN or DMISMD) and ends with an end file statement (ENDFIL). The commands contained between these statements will be driven by the demands of the inspection process. Most DMIS programs should include the following areas:

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