Entries by Rob Glassburn

What are Casting datums?

We have all seen prints with many datum reference frames on them. The fact that there are multiple sets of datum’s is not an issue and is put in place for functional design reasons. There can be so many that they look like an alphabet soup. But what about raw castings? Generally the functional part […]

Can you Measure a Gap in CT that is Smaller than the Voxel Size of the Scan?

A common question that we are asked is: what is the resolution of a CT scan for determining gaps or voids or true surface locations?  We are also asked:  How can you measure a gap between two parts that may be closer than 1 voxel in size?  The answer lies in sub-voxel surface determination and […]

Using a Hybrid Approach to Additive Manufacturing Metrology – CT – CMM

Modern Additive Manufacturing (AM) methods often employ subtractive machining to achieve precise dimensional and surface finish characteristics.  This is due to current AM limitations in build precision and surface quality.  These hybrid AM / subtractive components also demand a hybrid approach to measurement.  Internal features on AM parts are difficult or impossible to non-destructively measure […]

How to Handle Quality and Inspection Requirements in Uncertain Times

COVID 19 has literally shut down a majority of the world’s production. As we have talked with our customers over this time, we have found that many have reduced their workforce or have implemented rolling furloughs. The problem is that once you let that skilled person go, they may actually find other work before you […]

First Article Inspection – A Comprehensive Guide on How to Perform an FAI

First Article Inspections (FAI) are used to ensure that parts off of new or modified tooling or processes conform to the part design requirements.  This even includes changing the location of manufacture! Yes – this can make a difference sometimes (usually due to different equipment, the same equipment setup slightly differently, environmental conditions, different manufacturing […]

Using Laser or Structured Light Scanning to Preserve Your Tuned Molds and Dies – Just Like Notre Dame

Your Molds and Dies are critical to your business.  They were meticulously created and iteratively tuned until the parts they produce are within specification.  At that point, they were put into production and no documentation of the final tuned geometry was captured.  This is actually the standard operating procedure for most of the world.  The […]

What Data Collection or Scanning Equipment and Technology is Needed for My Project?

Many measurement and reverse engineering requirements require more than simple caliper or micrometer measurements.  Whether you are conducting a First Article Inspection (FAI), troubleshooting a manufacturing issue or reverse engineering a legacy part for improvements, one or multiple of the modern data collection methods may work – but what is best and what are you […]

Common Contact Measurement Devices and Methods

Contact measurement devices constitute the majority of what is traditionally used for dimensional metrology.  These consist of devices that must be in physical contact with the object to be measured.  Below is a listing of general types of contact measurement devices.  This covers the vast majority of what is used today and is a good […]

Common Non-Contact Measurement Devices and Methods

Non-contact or touchless dimensional measurement devices are the modern new comer to an array of contact devices that have been traditionally used.  Contact devices are discussed in this link on Common Contact Measurement Devices.  All of the non-contact devices generate a point cloud or voxel data set as their most raw form of data.  The […]

How is the Accuracy of Industrial CT Scans Verified?

Industrial CT scanning continues to gain popularity for use in measurements.  The real question to be asked is:  Is the data extracted from CT scans accurate?  Since its inception, CT scanning has been used to visualize internal structures from people to industrial items.  It is unparalleled in its ability to see those things that are […]