lab3c - LAB. #3, MACHINING EXPERIMENT I STRAIGHT AND FACE...

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LAB. #3, MACHINING EXPERIMENT I STRAIGHT AND FACE TURNING Purpose : To study methods for setting up and operating a lathe, and the use of measuring instruments to produce accurate workpiece dimensions. Machine : Engine lathe Tools: 6 inch dial caliper, steel ruler, uncoated carbide tools Material: Aluminum 6061-T6 bar (approximately 2 inch in diameter) Operations: A. Note relationship between cross slide and tool movement 1. Upon advancing the cross dial by 0.25” in the X-direction, the digital ‘X’ scale on the lathe should also indicate the same distance moved. This is also the change in diameter of the part. 2. However, the distance advanced by tool in the x-direction is only half the distance moved by the cross-dial (0.125” in this case). This is also equal to the change in radius of the part. B. Check tool set-up. 1. A carbide insert should already be located in a right-hand tool holder. Ensure it is at least finger- tight. 2. After inserting the tool holder onto tool post, check that the tool bit is at approximate right angles to the axis of centers. (See Figure #1). 3. Set the height of the tool to the same height as tailstock center point (slightly below is better than slightly above center). See Figure #1. C. Insert workpiece. Safety Note: Point of tool is sharp, be careful when inserting workpiece. 1.
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lab3c - LAB. #3, MACHINING EXPERIMENT I STRAIGHT AND FACE...

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