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What Is Coordinate Measuring Instrument And How Does It Ensure The Quality Of Your Metal Parts?

Writer: Kang Ding hardware Pubdate:2017-07-13 Source:CNC Machining Factory
Description:What Is Coordinate Measuring Instrument And How Does It Ensure The Quality Of Your Metal Parts? In the world of metal parts manufacturing, where machines are capable of making metal parts to micron accuracies, being able to measure markers...

What Is Coordinate Measuring Instrument And How Does It Ensure The Quality Of Your Metal Parts?

In the world of metal parts manufacturing, where machines are capable of making metal parts to micron accuracies, being able to measure markers and reliably is essential to qualifying every metal part that we make. Let's take a closer look at one of our important measurement tools The CMI, and how it works for you.

What Is A Coordinate Measuring Instrument?
Coordinate measuring instrument means within the spatial range of a hexahedron, can display the object geometry, length, circumference indexing and other measuring instruments, also known as a coordinate measuring machine or a coordinate bed.
At its most basic a coordinate is a point, a fixed singular location in three-dimensional space. A series of points can be used to define the parameters of a complex shape. Therefore a
coordinate measuring instrument (CMI) is any device that is able to collect this set of points for a given object and to do so with an acceptable degree of accuracy and repeatability.

What Are The Components Of A CMI?Components Of Coordinate Measuring Instrument

The foundation of the system is just that: a heavy base plate or table which serves as the foundation for an object placed on it to be measured. This is often a massive slab of granite or some other dense material that is stable, rigid, immune to fluctuations caused by the environment, and ground with a very flat top face.

 to this table is mounted a moveable bridge or gantry. Vertical posts support a horizontal beam, and on this beam will be suspended another vertical column that holds the measuring probe. The bridge or gantry is able to move along the X-axis. The vertical spindle can move along the bridge thus defining the Y axis. And the probe on the vertical column can move up and down which defines the Z-axis over the table. Three-axis use of natural high-precision granite rails, to ensure that the whole has the same thermodynamic properties, to avoid the three-axis material due to different thermal expansion coefficient caused by different machine accuracy error.

Drive mode: DC servo system + preload high-precision air bearings
Length measurement system: RENISHAW open scale, a resolution of 0.1μm
Probe system: Renishaw controller, Renishaw probe, Renisha stylus
Machine: high-precision (00 grade) granite platform
Use of the environment: temperature (20 ± 2) ℃, humidity 40% -70%, temperature gradient 1 ℃ / m, temperature change 1 ℃ / h
Air pressure: 0.4 MPa - 0.6 Mpa
Air flow: 25 L / min
Length Accuracy MPEe: ≤2.1 + L / 350 (μm)
Detection of ball accuracy MPEp: ≤ 2.1μm


CMI How Does The Probe Work?CMM Software System Of Coordinate Measuring Instrument
In the three-dimensional measurable space, the detection of the workpiece, return point data of the workpiece surface, calculate various geometric shapes and sizes of measuring instruments through a three-coordinate software system (eg AC-DMIS).
Coordinate measuring machine in the workpiece to measure, will meet a variety of various shapes of the workpiece. Any shape is composed of spatial points, all geometric measurements can be attributed to the measurement of spatial points, so accurate spatial point coordinates of the collection, is the basis for assessing any geometry.
The stylus is connected to exquisitely sensitive electronics that detect even the slightest deviation in electrical resistance coming from the probe. Each time the spherical tip contacts a solid object and is forced to deflect, that generates an electrical pulse which is sent to the computer which maps out a point on our imaginary X-Y-Z space. Hundreds or thousands of such points are collected, depending on the geometry and size of the part.
The exact size and position of the tip must be precisely known in advance to establish the “zero” point for all subsequent measurements. That is one of the reasons for using a ruby sphere, since it is a hard substance that does not fluctuate in size due to temperature or humidity. The tip is mounted on a spring-loaded stylus. That stylus in turn has an angular rotation of 105° and a circular rotation of 360°. As a result, the entire machine is considered a 5-axis CMI.

What Does This Mean For You When You’re Considering Making A metal parts?

Ultimately, reliable measurements  of complex shapes cnc machining, metal stamping and surfaces may rely upon a combination of tools and techniques, each one of which is optimized for a specific application. We use a variety of advanced tools to insure that every part we manufacture meets and exceeds your exacting requirements. If in doubt about how we will measure to your specifications, contact us and talk to one of our quality control experts.

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