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.
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 the essential requirements of application of 3-2-1 principle?
Restrict all six degrees of freedom so that the part cannot move. 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.
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 locator in jig and fixture?
Locator: device to establish and maintain position of. a part in a jig or fixture.
What is plate jig?
Plate jigs are sometimes made with legs to raise the jig off the table for large work. • Plate jigs mainly consist of a single bush plate with a provision for location and the clamping of workpiece.So the drill bushes guide the drills. Page 4. • Plate jig are employed are employed to drill holes on.
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 shimming in BIW?
Shims are typically used in order to support, adjust for better fit, or provide a level surface. Shims may also be used as spacers to fill gaps between parts subject to wear. Shims are the small parts which comes with the thickness of 0.1mm,0.2mm,0.5mm,1.0mm etc.
What is PLP or RPS?
RPS- Reference Punkt System. Same as PLP. Location Round Pin- Pin used to location BIW sheet metal parts.Also called 4way pin. Diamond Pin- Pin having diamond shape in top view.Used to restrict only 2 direction.Mostly referred as 2 way pin.
Why diamond pin is used in fixture?
Diamond pin location is used in fixtures because it takes care of any variation in center distance between two holes.
What is the function of ejecting device?
With removable disk drives, eject means to disengage the medium (removable disk) so it may be removed. For instance, with a CD-ROM drive, ejecting the disk opens the tray. Or, if the CD-ROM drive uses slot insertion, ejecting will mechanically reposition the CD so it sticks out of the slot.