What is the 321 Principle?

What is the 321 Principle?

A widely used method of accomplishing these two objectives uses the 3-2-1 principle, so-called because it entails three steps that employ three, then two, then one fixed points of known location. Since that adds up to six fixed points, it’s also known as the six point method.

When 3-2-1 principle in used to support and locate a three dimensional work piece during machining the number of degrees of freedom that are restricted?

Detailed Solution. There are 12 degree of freedom of a work piece i.e., movement about negative and positive axis and clockwise and anti-clockwise rotation about the three axis.

What is 3-2-1 method of locating the jigs?

The 3-2-1 method is a work-holding principle where three pins are located on the 1st principle plane, i.e., either XY, YZ, ZX. And two pins are located on the 2nd plane perpendicular to the 1st plane, and at last, one pin on the plane is mutually perpendicular to the 1st and 2nd planes.

What are the 3 principle forms of locating a workpiece?

The three forms of location: plane, concentric, and radial. Flat surfaces are common workpiece features used for location. Locating from a flat surface is a form of plane location. Supports are the principal devices used for this location.

When 3 2 1 principal is used to support and locate a job numbers of DOF that are restricted is?

3-2-1 Principle of Location used in Jig & Fixtures: [1] It is also known as a six-pin or six-point location principle. In this, the three adjacent locating surfaces of the blank (workpiece) are resting against 3, 2, and 1 pin respectively, which prevent 9 degrees of freedom.

What are locating devices?

“Locating Devices” describes the components used to position a workpiece in a workholding device. Locating is a crucial part of effective workholding. Locators come in a wide range of available types with various features. Common locators include pins, buttons, and pads.

What is locator in jig and fixture?

Locator: device to establish and maintain position of. a part in a jig or fixture.

What are the principles of location?

The 3-2-1 principle of location (six point location principle) is used to constrain the movement of workpiece along the three axes XX, YY, and ZZ. This is achieved by providing six locating points, 3 pins in base plate, 2 pins in vertical plane and 1 pin in a plane which is perpendicular to first two planes.

What is the use of locator devices?

What are clamping devices?

Clamping device are used to minimize the distortion during the machining process. Once the workpiece is located, it is necessary to hold it against the machining force. The mechanism used for this is known clamps. They are work holding devices usually positioned above the supporting surfaces.

What is a locator device?

Alternate term for an input device, especially one used in computer graphics to determine object coordinate data.

Why diamond pin is used?

One Round Pin and one Diamond Pin are often used together to locate from two machined holes in a workpiece, or to align two pieces of a fixture, without binding. Diamond pins are relieved, to locate only in 1 axis.

What is dowel pin?

What is a dowel pin? Dowel pins are sometimes referred to as straight pins or lock pins. In a manufacturing setting, dowel pins are solid, headless, cylindrical metal rods that have been machined to specific tolerances. These pins are typically used to align, locate, or join component to absorb lateral stress.

What are the work holding devices in lathe?

Chuck, Face Plate, Lathe Centers, Steady Rest and Mandrels, etc.

How does a tracking device work?

How Does a Vehicle Tracking Device Work? GPS tracking devices send special satellite signals that are processed by a receiver. These GPS receivers track the exact location of the GPS device as well as compute their time and the velocity they are traveling.

What are the types of tracking?

Different Types of Tracking Devices

• RFID. Radio Frequency Identification or RFID for short is a technique used in numerous fields for tracking purposes.
• Geofencing.
• Internet Tracking.
• Radio Tracking.
• Global Positioning System & Satellite Tracking.
• Cell-Phone Triangulation.