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07Lecture-lathe

# 07Lecture-lathe - “raw stock” is assumed to be rough...

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ENGR3300U – Integrated Manufacturing Systems Lecture 07 CNC Lathe Programming Part I Today’s lecture: Overview of CNC Lathe Programming – Not in book 1

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1.0 Introduction G-code programming for the lathe is similar to the mill, but there are differences. Sample G-codes and M-codes for the lathe are given in handout. For milling, we use X, Y and Z-axis. For the lathe, we only use the X and Z-axis. 2
Illustration of X-axis and Y-axis 2. Incremental & Absolute Programming Unlike milling where we use G90 and G91 to switch between incremental programming and absolute programming, in lathe we use U, W. Absolute X Y Z Incrementa l U - W 3. Diameter programming In CNC lathe, we think in terms of “diameter” when specifying coordinates in the X-axis. Point #1 = 0.2” above part Point #2 = right on the part Point #3 = 0.05” above the part N10 G00 X2.4 Z0 N20 X2.0 N30 U0.1 Example 3

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4. Where is Z0? In practice operator usually setup z0 to be 0.10” from the end since the end face of the

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Unformatted text preview: “raw stock” is assumed to be rough. • A facing operation is usually required to clean up the edge. 5. Cutting of the part • After the work is done, you will have to cut of the part. • This is done with a parting tool. • Assume parting tool is 0.157” wide. • Suppose you want to have a finished part 4.5” long, then you will need to clamp your part to allow for cut off. 6. Constant surface speed control G96 • For the lathe, it is common to use G96 to so that the chuck automatically adjust the spindle speed to maintain a constant surface speed of the tool relative for the part. • Specifying a value with G50 limits how fast the spindle can go. 4 7. Tracing Program Lecture-07-partO001.pdf Making front chamfer with turning tool Making back chamfer with parting tool 5 6...
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