What Is a Pin Joint?

There are many types of pins, such as cylindrical pins, tapered pins, slot pins, pins and split pins, etc. These pins have been standardized. These pins fit into the pin holes. The pin hole requirements for different pins are also different. ^[1]

Pin holes are fixing holes for pin placement. The pin hole varies according to the form of the corresponding pin. The specific situation depends on the choice of pins.

Pin holes and pins are often used to fix the relative position between parts in the equipment. It is an important auxiliary part when combined processing and assembly. So pins and pin holes are generally

Because the machining accuracy of the pin hole is high, it is common to drill a hole first, leave a proper margin, and then ream with a reamer.

Selection of pin hole drill

When choosing a drill, you need to refer to the following:

1. diameter

2. Tool tightening method

3. Geometry of the borehole ^{[3] [4]}

After drilling is completed, the tolerance level of the hole can reach: IT10 ~ IT13. ^[4]

Choice of pin hole reamer

The choice of reamer is the same as the drill:

Diameter

2. Tool tightening method

3. Geometry of the drilling

The revolving speed of the reamer is theoretically the same as that of the drill of the same size during processing, but the processed chips will cause additional vibration of the reamer, so the revolving speed of the reamer is usually adjusted to half the speed of the drill, sometimes Will be lower. ^[3]

After the reamer is processed, the tolerance level of the hole can reach: IT5 ~ IT10. Greatly improve the machining accuracy of pin holes. ^[4]