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How Does It Measure Up: CMMs vs. Articulating Arms

Posted by Mike Knicker on May 31, 2017 4:18:18 PM

 How Does It Measure Up CMMs vs Articulating Arms.jpg

How are your measurements adding up? Do you need automation combined with a high level of accuracy? Or perhaps, your application demands a portable measurement device for its ability to reach difficult to measure features? With the ever growing need for accurate measurements in a rapid paced manufacturing industry, knowing the best type of universal 3D dimensional measurement device available for your application will help streamline both your manufacturing and quality inspection processes. 

What is a CMM?

Coordinate Measuring Machines (CMMs) are mechanical systems that use measuring transducer technology to convert probe and physical measurements of an object's surface into electrical signals that are then analyzed by specialized metrology software. There are many different types of CMMs; cmm_descrip.jpgthe most basic systems use hard probes and XYZ read-outs, while the most complex employ fully automated continuous contact probing. For a system like a bridge CMM which uses this set of axes, each axis is used to indicate the system's position or location in space. The probe head determines the values on the Z-axis by moving up and down the system's bridge. The system's Y-axis determines its values by moving over the entire CMM's base. The values for the X-axis are determined by moving back and forth across the bridge.

Stationary CMMs such as bridge type CMMs, provide quality assurance with efficiency, accuracy, and flexibility due to their programmability. They can be set up for automated, repeated measuring tasks which do not need to be reprogrammed each time. In general, CMMs come with a wide array of sensors and probes and are ten times more accurate than articulating arms. However, due to the sensitive nature of these measuring instruments such as contact and vision-based probes as well as vision and laser sensors, which comprise most CMMs, a temperature and humidity controlled environment is an important factor to consider prior to incorporating a system into the quality inspection process. Unlike articulating arms which offer portability, CMMs are usually stationary or cumbersome to move. Also, there are a number of different software programs that run the machines, which would mean a significant investment in training CMM operators.

What is an Articulating Arm?

An articulating arm is a type of CMM that uses rotary encoders on multiple rotation axes instead of linear scales to determine the position of the probe. These manual systems are not automated, but they are portable and can reach around or into objects in a way that cannot be accomplished with a conventional CMM to perform 3D inspections, tool certifications, CAD comparison, dimensional analysis, reverse engineering, and more. The movement of the articulating arm allows for ease of use, as well as a broader scope of measuring ability as it pivots at the wrist, elbow, shoulder, and base of the system. The encoders at the system's base triangulate the location of each joint to the probe tip in 3D space.

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The measurements of very large parts can be easily accommodated by moving the articulating arm into another location around that part. The system's robust software is able to compile the measurement data from these individual locations and stitch all the data together to extend the measurement volume.

The ability to easily transport a highly accurate system such as an articulating arm allows users to take measurements onsite and in difficult to reach scenarios, without having to disassemble parts or transport large and heavy parts onto a fixed base. Improvements to articulating arms also include the integration of laser line scanners in combination with the traditional touch probe, thereby allowing the system to seamlessly scan across a diversity of surface materials, including those with high contrast, reflectivity, and geometric complexities. Unlike fixed CMMs, the probe of an articulating arm is not restricted to travel within the extent of a confined measurement bed. However, compared to the CMM which can be programmed to automate measurement, the articulating arm is manual and dependent on the operator to take measurements by moving the probe to each location on the part, and produces measurements which are generally less accurate than the fixed CMM. Operators will also have to learn to adjust to the motion of using the articulating arm, as it is fixed to a base.

Consider All Factors

There is not a single particular factor that will determine if a CMM or an articulating arm is best suited for your specific application. However, factors to consider that will inevitably affect the final decision will include:

  • Accuracy of measurement results
  • Portability of the system
  • Size of the parts being measured
  • Features that will be measured
  • Degree of automation required during measurement
  • Cost of the system
  • Cost of training operators

Q-PLUS Labs has been a leading dimensional measurement laboratory since 1987 and, in addition to its wide array of services and products, specializes in helping companies find the right measurement solutions to meet their needs. Contact us for answers to your dimensional measurement and inspection questions or to request a quote.

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Topics: dimensional measurement, dimensional inspection, 3D scanners, dimensional inspection equipment, CMMs, articulating arms, 3D scanning equipment, Faro Arm, dimensional measurement services, measurement services,, coordinate measuring machines, metrology lab

Three Types of 3D Scanning Methods for Non-Contact Nano Measurement

Posted by Mike Knicker on Feb 18, 2015 2:50:00 PM

Three Types of 3D Scanning Methods for Non-Contact Nano Measurement

Dimensional inspection includes many types of scanning devices for a broad range of applications. In the realm of 3D Scanning, the level of detail that can be captured makes it the method of choice, especially for measuring very small objects requiring non-contact measurement methods.

Whereas contact 3D scanners collect measurement data by physically scanning the object with a device that comes into contact with every point on the surface, non-contact 3D Scanners collect immense amounts of data quickly without altering the geometry of the object. This is also an advantage for collecting measurements on the nano scale.

3 Types of Non-Contact 3D Scanning Methods

Laser-Scanning Confocal Microscopes
A confocal microscope uses a process called optical sectioning to collect images from various depths. These images can be reconstructed with a computer to create a 3D model of complex small objects. Unlike other laser systems, a confocal microscope only sees one depth level at a time, which allows it to generate a highly controlled depth of focus for very small objects with tight tolerances.

White Light Interferometry
This non-contact measurement system allows you to obtain surface measurements at the nanometer level. The technology behind white light interferometry uses wave superposition to measure distances based on data collected about reflected wave interactions. Interferometers can also be combined with microscopes to measure very small objects. Because they rely on the detection of waves and not optical images, interferometers are also useful for measuring objects with reflective surfaces.

Chromatic Confocal
Like interferometry, chromatic confocal also uses white light to collect measurement data. However, whereas interferometry uses the superposition of waves after they are reflected off the object, chromatic confocal measures the wavelength as it hits the surface of the object. This method produces more reliable results when measuring surface roughness or step-height depth, due to the minimum mathematical calculation required. The tolerances of large objects may allow the use of a thin whitening spray to facilitate scanning but the geometry of very small objects could be potentially buried by it. Fortunately, all of these methods work well with various types of surfaces from reflective to absorbent.

If you require any of these types of 3D Scanning methods, or if you're not sure what you need, the experts at Q-PLUS Labs are here to help. We'll work closely with you through every step of the process to ensure that you get the best results for your application. Contact us anytime if you have questions, or if you're ready to get started, call us today.

 

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Topics: dimensional measurement, 3D scanners, 3D Scanning, CMMs, articulating arms, 3D scanning equipment, case studies, engine, Faro Arm, Faro, SAE, race car, Fullerton SAE

Q-PLUS Labs' Case Study: California State University, Fullerton SAE Race Car Engine Dimensional Analysis

Posted by Mike Knicker on Jan 27, 2015 10:55:00 AM

Q-PLUS Labs Case Study: Race Car Engine

California State University, Fullerton's Society of Automotive Engineers (SAE) chapter chose Q-PLUS Labs to aid them with the challenge to compete in the Formula SAE, a competition which encompasses designing, building, and competing a mini-formula style race car that will be evaluated for its potential as a production item.

Introduction

chassisFullerton's SAE uses a Yamaha R6 Motorcycle engine, a large displacement choice for the 610cc class. The car's design utilizes the R6 engine as a stressed member to connect the drivetrain to the cockpit. This type of engine design requires the chassis to work with the engine as an active structural element of the chassis to transmit forces and torques, rather than using standard anti-vibration mounts to passively contain it. The R6 engine was chosen based off its high power output and ability to be used as a stressed member. In conjunction with suspension design and tire selection, the engine weight works well to keel the tires while heated under the track's conditions.

Our Process

engine

Because the race car's design is based on the integrity and precision accuracy of the engine's measurements, Fullerton's SAE sought the expertise of Q-PLUS Labs' dimensional inspection engineers. Using a Faro Arm CMM, Q-PLUS Labs provided a dimensional analysis of each mounting point for the engine. These points are integral not only to the race car's design but also to the safety of the driver.

Given the engine's exact 3D measurements, Fullerton's SAE could confidently proceed with their design. They were able to retrofit and reverse engineer the chassis to properly fit onto the race car's engine. Currently in the manufacturing stage process, in a few months they will produce the assembled chassis to compete in the Formula SAE® Lincoln this June.

 

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Topics: dimensional measurement, 3D scanners, 3D Scanning, CMMs, articulating arms, 3D scanning equipment, case studies, engine, Faro Arm, Faro, SAE, race car, Fullerton SAE

3 Types of Dimensional Inspection Contact Sensors and When to Use Them

Posted by Mike Knicker on Apr 23, 2013 6:15:00 AM

dimensional inspection contact sensorsFor some dimensional inspection applications, the best way to obtain measurements is by using a sensor that comes into contact with the object. Contact sensors work best when the object is rigid and not fragile. They are also often used when the surface of the object does not lend itself to light sensors because it is reflective or too dark.

3 Types of Dimensional Inspection Contact Sensors

If your application does lend itself to a contact sensor, the three primary options are:
  1. Coordinate measuring machines - Also known as CMMs, these mechanical systems use probes to measure the surface characteristics of an object. The physical measurements are converted by a transducer into electrical signals that are then analyzed by specialized software programs. Basic models provide XYZ readouts, while more advanced technology can work with CAD models and can be fully automated. CMMs are often used for first article inspection or quality control.

  2. Articulating arms - These are basically portable CMM systems that are not limited to the linear X, Y, and Z axes. Because they can move on multiple axes of rotation, articulating arms are often used when the object has cavities or other geometry that limits the accuracy of a traditional CMM. They are also useful when an object must be measured in the field.

  3. Form and contour tracers - For small objects or those with very tight tolerances, form and contour tracers use a stylus with continuous contact on the surface to measure features such as edge radii, thread forms, roundness, and cylindricity.

There are several other types of contact sensors, and even more types of equipment within each category. If you're not sure what type of equipment will produce the desired results, it's best to work with an experienced professional. Contact sensors do not work well for dimensional inspection when the object is soft, elastic, or extremely small. In these cases, non-contact sensors are generally the best option.

Q-PLUS Labs is here to help you decide what type of dimensional inspection equipment makes the most sense for your application. To learn more, download our free guide, or contact us today to schedule a consultation.

What type of contact sensor do you think would work best for your dimensional inspection needs?

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Topics: dimensional inspection, contact sensors, CMMs, articulating arms, form and contour tracers