Air Refrigerator Working On Bell-Coleman Cycle with PV and TS Diagram (Reversed Brayton or Joule Cycle)

bell coleman diagram

Fig shows a schematic diagram of Bell-Coleman refrigerator (reverse Brayton or joule cycle). It consists of a compressor, cooler, Expander, and refrigerator. In this process, heat absorption and rejection follows at the constant pressure; the compression and expansion of process are isentropic.

What Is Clamping Devices? Requirements of 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. Fibre pads are riveted to the face of clamps where the metallic clamp get contact with the workpiece to avoid damage by metallic contact.

Types of Jig Bushes. Fixed Bush, Liner Bush, Renewable Bush, Slip Bush, Screw or Clamping Bush

drill bush

What is jig bush

Jig bushes are used to locate and guide the tools like drills, reamer, and counterboring cutters. They are generally referred as drill bushes. Jig bushes are fitted into bush plate of the jig. Even though the bushes drill bushes are hardened and made into exact size, they will subject tear and wear by the action of chips. So the one of the design consideration of jig is that giving a necessity of replacing of bushes.

Fool Proofing of Location Devices

fool proofing

Foolproofing is a method which ensures the correct loading of components. This concept ensures that the component will fit into work holder only in its correct position. The location devices make it difficult/ impossible to the user to load component incorrectly in a jig and fixture. In order attain perfection in machining fixture should accept the workpiece in one position only.

Read : Locating Of Workpiece In Tool Engineering. Basic Rules For Location

3-2-1 Principle of Location (Six Point Principle) Degree Of Freedom Controlled By 3-2-1 Location Principle - With Image

3-2-1 Principle, six point principle of location

3-2-1 Principle 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.