Presentation on Locating and Locator.
Download as PPTX, PDF0 likes208 views
This document provides an overview of locating and locators. It defines locating as establishing the dimensional and positional relationship between a workpiece and cutting tool. Locators are used to establish and maintain the position of a part in a jig or fixture. The document outlines seven rules of locating: 1) referencing, 2) repeatability, 3) accuracy and tolerance, 4) fool proofing, 5) motion economy, 6) controlling chips, and 7) avoiding redundant locators. It also describes three forms of location: plane surface, cylindrical surface, and radial. The conclusion emphasizes that good locating is important for achieving good dimensional accuracy and surfaces in finished products.
Presentation on Locating and Locator.
- 2. Md. Nazmul Hasan Dipu (2015334034) Faruk Mia (2015334026) Group Members Tanvir Mia (2015334005) Anup Mondal (2015334015) Nayan Bhowal (2015334045) Zihad Islam (2015334055)
- 3. Objectives Introduction to locating & locator Basic rules for locating Forms of location Conclusion 1 2 3 4 5 Outline 7
- 4. Forms of location Definition Purpose of locating Rules of locating Objectives of this presentation
- 5. Definition Purpose Locating refers to dimentional and positional relationship between workpiece and cutting tool used to on the machine. Locator device to eastablish and maintain position of a part in a jig or fixture. • Positioning the workpiece relative to the workholder • Positioning the workholder relative to the cutting tool • Producing products to tolerance limits • Part fits into the tool in its correct position • Restrict the degree of freedom • To control chips • Maintain position of a part in a jig or fixture
- 6. Rules 1. Referencing 7. Redundant Locators 6. Controlling Chips 5. Motion Economy4. Fool Proofing 3. Accuracy & Tolerance 2. Repeatability
- 7. Referencing is a dual process of positioning the workpiece relative to the workholder, and the workholder relative to the cutting tool. Referencing the workholder to the cutting tool is performed by the guiding or setting devices. 1. Referencing
- 8. Repeatability is the ability of the workholder to consistently produce parts within tolerance limits, and is directly related to the referencing capability of the tool. 2. Repeatability
- 9. The workpieces itself determines the overall size of a locating element. Locators must be made to suit the MMC (Maximum-Material Condition) of the area to be located. 3. Accuracy & Tolerance
- 10. Ensures that the part fits into the tool in its correct position only. The simplest and most cost effective method is positioning a fool proof pin. 4. Fool Proofing
- 11. It involves use of easy , quick and economic loading of workpieces 5. Motion Economy
- 12. The final consideration in the placement of locators involves the problem of chip control. Chips are an inevitable part of any machining operation and must be controlled so they do not interfere with locating the workpiece in the workholder. Several methods help minimize the chip problem. First, position the locators away from areas with a high concentration of chips. If this is not practical, then relieve the locators to reduce the effect of chips on the location. 6. Controlling Chips
- 13. Another condition to avoid in workholder design is redundant, or duplicate, location. Redundant locators restrict the same degree of freedom more than once. 7. Redundant Locators
- 14. Forms 1. Plane Surface 3. Radial2. Cylindrical Surface
- 16. Plane locators locate a workpiece from any surface. The surface may be flat, curved, or have an irregular contour. In most applications, plane- locating devices locate a part by its external surfaces. Plane locators locate a workpiece from any surface. The surface may be flat, curved, or have an irregular contour. In most applications, plane-locating devices locate a part by its external surfaces. The third type of location is radial. Radial locators restrict the movement of a workpiece around a concentric locator.
- 17. Good locating provides good dimension and surface of finished products. So we should concern about appropriate locator to obtain desirable products. Otherwise, all effort will go in vain.
- 18. Thank you