A CMM fixture is a specialized work-holding system used to stabilize and orient parts during measurement on a Coordinate Measuring Machine. Unlike high-pressure assembly fixtures, CMM fixtures focus on unobstructed probe access and repeatable positioning to ensure accurate dimensional inspection and data consistency across multiple parts.
A CMM is a precision measurement device utilized in quality control and manufacturing. This device is used to measure the geometric features, dimensions, and other identifying characteristics of certain objects. Fixturing ensures that the workpiece will stay in place and be correctly measured by the CMM.
CMM fixtures play multiple roles for engineers including:
There are two main ways to manufacture CMM fixtures. One way is by custom machining fixtures, the other is by utilizing additive manufacturing.
In terms of custom machined fixtures, the fixture is produced through traditional methods such as CNC machines. While these machines can create multiple thousands of fixtures at once, there are many drawbacks. Producing fixtures with traditional processes is tedious and time-consuming. This leads to elongated wait times for outsourced fixtures which slows down overall the QA process. Additionally, customization isn’t possible for complex parts. This may lead to time wasted designing and sometimes even redesigning fixtures
FDM printers utilize a large range of polymers which create CMM fixtures that exhibit strength and stiffness, temperature stability, UV resistance, or chemical resistance. These fixtures can be produced in complex shapes, applicable for all types of workpieces. CMM fixtures produced with FDM also enable the ability to incorporate additional retention features, such as magnets, to hold fixtures in place. Notably, one customer printed their CMM fixtures within 20 hours as compared to the typical 4–6-week time frame. They also lowered the cost of a specific application from $2,700 to only $270. Another customer saved 93% in lead time and 80% in cost.
By producing CMM Fixtures with additive manufacturing and FDM printers, the fixtures will be customized, cost less, and be ready within a faster timeframe. This leads to more accurate measurements, a better use of your budget, and valuable time saved for your business.
Learn more about 3D Fixturing applications by reading our new 3D Fixturing Guide!
