Thread gages play a crucial role in quickly and precisely ensuring that tapped holes, nuts, bolts, and screws adhere to the strict tolerances required by most manufacturing processes. Frequently utilising them can provide the first indication of issues with the setup or tooling, errors in tool selection, bell-mouth openings, or burrs. Here we shall explore the different types of gages.
GO/NOGO Gages
The GO/NOGO Gages aim to ascertain whether the threads on externally threaded components (such as bolts and screws) match the threads on complementary internally threaded components (such as nuts and tapped holes). This is accomplished by accurately determining the thread's pitch, lead, and angle using GO/NOGO threaded gages. The gauge for a specific part is calibrated so that the NOGO portion does not "fit" correctly manufactured parts or holes.
Thread gages
GO, and NOGO sections are frequently attached to thread plug gages like the 17025 Certified Thread Gage, which is utilised for internal threaded product testing. The GO portion is longer and, in larger sizes, features a chip groove for simple cleaning to distinguish it from the other. The GO portion will completely thread onto nuts within tolerance with little effort.
Before binding up, the NOGO portion will fail to engage a "good" part for more than three complete revolutions. The GO test demonstrates that a component's hole is large enough to accommodate its matching shaft without causing excessive stress. The hole is small enough to allow for a strong, tight fit when it fails the NOGO test. Both of these conditions must be satisfied for a hole or nut to fall within the specified tolerance.
Ring cages
On the other hand, Ring Gages measure the precision of externally threaded components with ring gages. Along with the ring, solid ring gages, calibrated to a specific thread set plug or master, are required to determine the thread pitch and diameter acceptability. When the bolt threads completely through the GO ring but engage the NOGO ring by fewer than three revolutions, it is considered to be within tolerance.
Setting (Master) Gages
Due to their precise tolerances, master gages, in contrast to "working" plug and ring gages, are not intended for use in direct part testing. Instead, they calibrate brand-new rings, plug gages, and check their accuracy regularly throughout their useful lives.
Styles of Plug Gages
Their threaded members in the handle distinguishing plug gages from one another. Wedging the shaft into the handle is how taperlock thread plug gages attach. Reversible gages, which are slightly more expensive, can be turned around by inserting the worn gage threads and bushing into the handle. Reversible gages have a longer lifespan because the unused section previously housed inside the handle becomes the working end.
Conclusion
Thus these are the different types of gages that are found. These can be moulded accordingly and used with precision upon the practical aspect needed. In the long run, these help to streamline tasks.
