What is 3-2-1 principle of location explain with figure?

What is 3-2-1 principle of location explain with figure?

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

What is meant by 3-2-1 principle how is it important in relation to location of components?

The 3-2-1 principle states that the six locators are sufficient to restrict the required degree of freedom of any workpiece. In this, motion is restricted using clamps and locators. A three-pin base can restrict five motions and six pins restrict nine motions.

What is 3-2-1 principle of jig and fixture?

The 3-2-1 principle Locating a part to be machined involves mainly three steps: Supporting, Positioning, and Clamping. Two main intentions when placing a job on a jig/fixture are: Precisely positioning the part at the desired coordinates. Curbing all six degrees of movement so that the part cannot budge.

What is the locator principle?

BASIC PRINCIPLES OF LOCATING To perform properly, workholders must accurately and consistently position the workpiece relative to the cutting tool, part after part. To accomplish this, the locators must ensure that the workpiece is properly referenced and the process is repeatable.

What is the function of 3 2 1 principle why it is necessary how is it applied?

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.

When 321 principle is used to support and locate a three dimensional workpiece during machining the number of degrees of freedom that are restricted is?

To completely prevent movement, all six degrees of freedom must be restricted.

What is location in jig and fixture?

The location refers to the establishment of a desired relationship between the workpiece and the jigs or fixture correctness of location directly influences the accuracy of the finished product. The jigs and fixtures are desired so that all undesirable movements of the workpiece can be restricted.

Where is diamond pin locator used?

Diamond pin location is used in fixtures because it takes care of any variation in center distance between two holes.

What is a 4 way or 2 way location?

4-way mean you prevent movement at 2 axis (+X, -X, +Y and -Y) on the plane. Generally you have cylindrical pin on the fixture and circular hole at workpiece part. 2-way mean you prevent movement only at 1 axis on the plane. And generally you have cylindrical pin on the fixture and slot hole at workpiece part.

What is locator in jig and fixture?

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

Why are locators used?

The answer to this is “Locators in Selenium”. Locators are the way to identify an HTML element on a web page, and almost all UI automation tools provide the capability to use locators for the identification of HTML elements on a web page.

What is the purpose of jig?

a jig is a type of tool used to control the location and/or motion of another tool. A jig’s primary purpose is to provide repeatability, accuracy, and interchangeability in the manufacturing of products. A device that does both functions (holding the work and guiding a tool) is called a jig.