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TASK: Turning a Mild Steel Bar.We were each given a mild steel bar to work into the shape shown in the drawing found on the following pages,

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Introduction

Mini Project: Workshop Machinery Dan Peart A223245 TURNING TASK: Turning a Mild Steel Bar. We were each given a mild steel bar to work into the shape shown in the drawing found on the following pages, to do this we used the Turning Lathe in the workshop, but before we could start some measurements had to be taken. This meant using a micrometer to determine the diameter of the bar to begin with. A micrometer allows a measurement of the size of a body. It is an extremely accurate piece of apparatus. The Thimble is rotated, causing it to move right or left. It is connected to the right-hand Measuring Rod. The measured size of the mild steel bar is the distance between the two measuring rods when they are just in contact with the sides of the bar. Because of the mechanical advantage due to the fine pitch of the screw threads that move the thimble and the right-hand measuring rod, it is easy to use enough force in closing the rods on the object being measured to deform either the rods or the object. A Friction Screw is used, which applies just enough torque to rotate the thimble so it doesn't deform the bar or the measuring rod. ...read more.

Middle

The depth of the slot was to be 5mm, which was obtained by two 2.5mm cuts, when cutting the slot an oil based coolant was applied to prevent overheating. Once the slot had been made, a hole through the centre of the piece was to be made, this was done by once again using the digital axis guide and locating the centre of both the x and y axis. The Slot mill was taken out of the machine using a spanner and releasing the nut at the top of the machine and giving a firm tap with a mallet (Before turning the milling machine on again, the spanner was replaced to its storage place as it is dangerous to leave the spanner on the rotating nut.). This was replaced firstly with a centre punch which helps the drill bit locate the centre of the material. The centre punch only needs to go to a depth of about 2mm. The Drill bit is then inserted into the chuck. The hole is specified as an M8 x 1.25 pitch, therefore a drill bit of about 6.8mm is used. Again an oil based coolant is used to prevent overheating and the drill is gently lowered into the material. ...read more.

Conclusion

As it reads the program, the CNC control will activate the appropriate machine functions, cause axis motion, and in general, follow the instructions given in the program. Along with interpreting the CNC program, the CNC control has several other purposes. All current model CNC controls allow programs to be modified if mistakes are found. The CNC control allows special verification functions (like dry run) to confirm the correctness of the CNC program. The CNC control allows certain important operator inputs to be specified separate from the program, like tool length values. In general, the CNC control allows all functions of the machine to be manipulated. Machining processes that have traditionally been done on conventional machine tools are possible (and in some cases improved) with CNC machines. These include all kinds of milling (face milling, contour milling, slot milling, etc.), drilling, tapping, reaming, boring, and counterboring. There are many advantages to using CNC machines, these include automatic or semi-automatic operations, shorter lead times, complex shapes can be produced easily, cycle times fixed by the program for greater production control and less space used in the workshop due to there being only one machine for the various tasks. The disadvantages of CNC is the initial cost of the equipment, also the reduction of jobs available to humans and retraining of staff is both essential and time consuming. ...read more.

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