How to Choose plug gauges for checking fixtures?

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Plug Gauges for Checking Fixtures - Straight

MISUMI

MISUMI Plug Gauges for Checking Fixtures - Straight, precision-engineered for accurate measurements, provide reliable dimensional verification by ensuring proper fit and alignment in various applications. Designed to facilitate quality control processes, these plug gauges optimize operation and extend equipment lifespan in manufacturing and assembly environments. With durable construction, plug gauges effectively maintain measurement integrity, protecting sensitive systems without compromising performance, ensuring consistent product quality throughout production cycles.

CAD Available in 2D and 3D

Plug Gauges for Checking Fixtures - Oblong, Double Stepped

MISUMI

MISUMI Plug Gauges for Checking Fixtures - Oblong, Double Stepped, Hardened offers reliable precision measurement by ensuring accurate fit and alignment during quality control processes. Designed to facilitate efficient inspection of components, these plug gauges optimize operation and extend equipment lifespan in manufacturing and assembly environments. With durable construction, these gauges effectively maintain dimensional integrity, protecting sensitive systems without compromising performance, making them an essential tool for quality assurance and production efficiency.

CAD Available in 2D and 3D

Plug Gauges for Checking Fixtures - Oblong

MISUMI

MISUMI Plug Gauges for Checking Fixtures - Oblong, Hardened provide reliable precision measurement by ensuring accurate fit and alignment. Designed to facilitate quality control processes, these plug gauges optimize operation and extend equipment lifespan in manufacturing environments. With durable construction, these gauges effectively maintain dimensional integrity, protecting sensitive systems without compromising performance. Ideal for rigorous applications, they support consistent quality assurance and enhance productivity through dependable functionality.

CAD Available in 2D and 3D

Plug Gauges for Checking Fixtures - Double Stepped, Configurable Gauge Length, 1st Step S Dimension h7 Tolerance

MISUMI

MISUMI Plug Gauges for Checking Fixtures - Double Stepped, Configurable Gauge Length, 1st Step S Dimension Tolerance=h7 provides reliable measurement accuracy by ensuring precise fit within checking fixtures. Designed to facilitate seamless inspection processes, these plug gauges optimize operation and extend equipment lifespan in manufacturing environments. With durable construction, plug gauges effectively maintain measurement integrity, protecting sensitive systems without compromising performance, contributing to enhanced quality control and operational efficiency.

CAD Available in 2D and 3D

Marking Pins for Checking Fixtures

MISUMI

MISUMI Plug Gauges for Checking Fixtures offer reliable precision measurement by enabling accurate assessment of hole diameters in various applications. Designed to streamline quality control processes, the plug gauges ensure consistent performance across manufacturing environments. Providing a durable solution, these gauges effectively minimize measurement errors without compromising on accuracy. With their robust design, MISUMI Plug Gauges enhance efficiency and reliability in checking fixtures, making them an essential tool for maintaining high standards in production quality.

CAD Available in 2D and 3D

Plug Gauges for Checking Fixtures - Double Stepped, Fixed Gauge Length, 1st Step S Dimension h7 Tolerance

MISUMI

MISUMI Plug Gauges for Checking Fixtures - Double Stepped, Fixed Gauge Length, 1st Step S Dimension Tolerance=h7 provides reliable precision measurement by ensuring accurate fitment in various applications. Designed to facilitate efficient quality control processes, these plug gauges optimize operation and extend equipment lifespan in manufacturing and assembly environments. With durable construction, these gauges effectively maintain measurement integrity, protecting sensitive systems without compromising performance or accuracy, thus enhancing overall productivity and reliability.

CAD Available in 2D and 3D

Reference Pins for Checking Fixtures - Diamond

MISUMI

MISUMI Plug Gauges for Checking Fixtures Quench: with Reference Pins for Checking Fixtures - Hardened provides reliable accuracy by ensuring precise measurements in checking fixtures. Designed to facilitate effective quality control, these hardened plug gauges optimize operation and extend equipment lifespan in manufacturing environments. With durable construction, hardened plug gauges effectively maintain alignment and integrity, protecting sensitive systems without compromising performance. Ideal for rigorous applications, these gauges ensure consistent results and enhance overall efficiency in production processes.

CAD Available in 2D and 3D

Reference Pins for Checking Fixtures - Diamond Tapered

MISUMI

MISUMI Plug Gauges for Checking Fixtures, Reference Pins for Checking Fixtures - Diamond, provide reliable precision measurement by ensuring accurate alignment and verification of checking fixtures. Designed to facilitate quality control processes, these plug gauges optimize operation and extend equipment lifespan in manufacturing environments. With durable construction, these reference pins effectively maintain measurement integrity, protecting sensitive systems without compromising performance, thus enhancing overall productivity and reliability in critical applications.

CAD Available in 2D and 3D

Reference Pins for Checking Fixtures - Round Tapered, Threaded Tip

MISUMI

For more information, please visit Kuasu.

MISUMI Plug Gauges are precision tools used to verify the accuracy and quality of components in manufacturing. They have tapered reference pins for reliable measurements on threaded, round, and hardened surfaces. Using these gauges allows manufacturers to check the integrity of fixtures, ensuring compliance with tolerances and performance standards.

CAD Available in 2D and 3D

Plug Gauges for Checking Fixtures - Double Stepped, Configurable Gauge Length, 2nd Step S Dimension h7 Tolerance

MISUMI

MISUMI Plug Gauges for Checking Fixtures - Double Stepped, Configurable Gauge Length, 2nd Step S Dimension Tolerance=h7 provides reliable precision measurement by ensuring accurate fitting checks for components. Designed to facilitate quality control processes, these plug gauges optimize operation and extend equipment lifespan in manufacturing and assembly environments. With durable construction, plug gauges effectively maintain dimensional integrity, protecting sensitive systems without compromising performance, ensuring consistent product quality and reliability throughout various applications.

CAD Available in 2D and 3D

Plug Gauges for Checking Fixtures - Double Stepped, Fixed Gauge Length, 2nd Step S Dimension h7 Tolerance

MISUMI

MISUMI Plug Gauges for Checking Fixtures offer reliable precision measurement by utilizing a double stepped design with fixed gauge length. Designed to ensure accurate verification of hole dimensions, the plug gauges guarantee consistency and reliability across various manufacturing environments. Providing a durable solution, these gauges effectively streamline quality control processes without compromising measurement performance. With a clear focus on dimensional accuracy, MISUMI Plug Gauges enhance inspection capabilities for high-quality production outcomes.

CAD Available in 2D and 3D

Plug Gauges for Checking Fixtures - Straight, Tapered End

MISUMI

MISUMI Plug Gauges for Checking Fixtures - Straight, Tapered End, offers precise measurement capabilities by ensuring accurate fitment and alignment. Designed to facilitate quality control processes, these plug gauges optimize operation and extend equipment lifespan in manufacturing environments. With durable construction, plug gauges effectively verify dimensions, protecting sensitive systems without compromising performance. Ideal for various applications, they enhance productivity while maintaining high standards of accuracy and reliability in checking fixtures.

CAD Available in 2D and 3D

In this Question Line Video, Brandon explains Rule #1 of GD&T (the Envelope Principle) and how Go/No-Go gages are used to verify that Rule #1 is met for a feature of size.

Rule #1 – Envelope Principle

Rule #1 of GD&T, also known as the Envelope Principle,  states that the surface of a feature of size must conform to a boundary (envelope) of perfect form at the Maximum Material Condition (MMC) size. In other words, the size tolerances of a feature of size also control the form of the feature. This is one of the core principles of the ASME Y14.5 GD&T Standard.

Let’s look at an example to visualize the envelope principle. In the example below, we have a block with a cylindrical hole through it. The hole is dimensioned with a diameter of 1.50 with +/-.03 tolerances. These tolerances result in the MMC size of the hole equal to 1.47 and the LMC (Least Material Condition) size equal to 1.53. The red cylinder in Figure 1 represents the MMC envelope, which no element of the surface of the bore can come inside.

Figure 1: MMC Envelope of a Cylindrical Hole Feature

The allowable amount of form deviation is determined by the difference between the measured size and the MMC size of the feature. When the measured size of the feature is at MMC, it must have perfect form. Perfect form is impossible to achieve, so a feature measuring at MMC would be rejected. As the size of the feature departs from MMC, more form deviation is allowed. With this being a cylindrical feature, the result is more allowed deviation in circularity and straightness. The maximum amount of form deviation allowed occurs when the feature is measured at its LMC size.

Figure 2: Form Deviation allowed at MMC, Nominal, and LMC Measurements

Go & No-Go Gaging

When we are relying only on Rule #1 to control form, the form error does not get reported. However, it must be checked as a pass/fail for the Rule #1 requirement. This is most commonly checked through Go/No-Go gaging.

A “Go” gage is a fixed limit gage that checks a feature of size for acceptance within the MMC perfect form boundary (the boundary illustrated by the red envelope in the previous section).

A “No-Go” gage is a fixed limit gage that checks a feature of size for violation of the LMC actual local size.

For the feature to pass inspection, the Go gage must fit, and the No-Go gage must NOT fit.

Figure 3: Pin Go/No-Go Gage

According to ASME Y14.43, the Dimensioning and Tolerancing standard for Gages and Fixtures, the tolerance of the gage itself must be within the size limits of the workpiece. This is defined as the “Absolute Tolerance Policy”. This means that the tolerances given to the gage will effectively reduce the workpiece tolerance available. This can result in good parts failing inspection, but will ensure that bad parts will always fail.

Pin and Ring Gage Tolerances

For Pin and Ring Gages, the standard practice is to allow 5% of the hole tolerance for the Go Gage and 5% for the No-Go Gage tolerance. Once you have calculated your Gage tolerance, you can determine the tolerance class of the required gage by referring to a Gage chart, such as our Gage Maker’s Tolerance Chart shown below. Tolerances in the chart come from ASME B89.1.5 (Pins) and ASME B89.1.6 (Rings). Details on calculating gage tolerance and determining tolerance class are explained in the video above.

Figure 4: Tolerances for Pin and Ring Gages

Gage Block Tolerances

Precision Gage Blocks are used for Go/No-Go gaging and many other applications. They are made of steel or ceramic, and can be stacked together (wrung). When properly wrung, the gap between the blocks is around one millionth of an inch. Check out this video from Mitutoyo for more information regarding Precision Gage Blocks: www.mitutoyo.com/educational-resource/mitutoyo-gage-blocks/

Figure 5: Gage Blocks

Inspecting with a CMM

If you are inspecting parts using a CMM rather than Go/No-Go gages, you still need to ensure that Rule #1 requirements are being met if your drawing references ASME Y14.5. Always verify that your CMM is doing the appropriate Rule #1 inspection.

For information on CMM – GD&T Measurement Planning, check out this resource from Mitutoyo:

Are you interested in learning more about plug gauges for checking fixtures? Contact us today to secure an expert consultation!