Sailing ship for CNC

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A CNC machining program is a set of instructions that controls the movement of a machine tool to create a specific product. It consists of a series of commands and parameters that define the cutting path, speed, and feed rate of the tool. Here's an example of a CNC machining program: `N10 G21 (absolute mode)\r\nG90 (incremental mode)\r\nM03 S1000 (spindle on at 1000 RPM)\r\nG00 X1. Y-1.25 (rapid traverse to x=1, y=-1.25)\r\nG01 Z-1.25 F10.0 (linear interpolation along z-axis at feed rate of 10 mm/min)\r\nM08 (spindle off)\r\nG00 X0.0 Y0.0 (rapid traverse to origin)\r\nM30 (program end)` In this example, the program starts by setting the absolute mode (`G21`) and incremental mode (`G90`). It then turns on the spindle at 1000 RPM (`M03 S1000`). The program then moves the tool rapidly to x=1, y=-1.25 using `G00`. Next, it moves the tool along the z-axis at a feed rate of 10 mm/min using `G01 Z-1.25 F10.0`. Finally, it turns off the spindle (`M08`) and returns to the origin (`G00 X0.0 Y0.0`). The program ends with `M30`. The variables used in the program are: * N: line number * G: command code (e.g., G21 for absolute mode) * M: miscellaneous function code (e.g., M03 for spindle on) * S: spindle speed * X, Y, Z: coordinates * F: feed rate The speeds and feeds used in the program can be calculated using a formula or by consulting a calculator. A common formula is: `Feed = (Material hardness x Machining time) / (Tool hardness x Material strength)` For example, if we are machining aluminum with a hardness of 20 HRB, a machining time of 10 minutes, and a tool hardness of 60 HRB, the feed rate would be: `Feed = (20 x 10) / (60 x 1000) = 3.33 mm/min` It's essential to have the correct speeds and feeds in the program to avoid damage to the tool, machine spindle, or product. References: * Mike Lynch, "Key CNC Concept #1—The Fundamentals Of CNC", Modern Machine Shop, 4 January 1997. * Grace-flood, Liam (2017-11-10). "Goliath Represents a New Breed of CNC Machine". Wevolver. Retrieved 2018-01-20. * "Multi Spindle Machines - An In Depth Overview". Davenport Machine. Retrieved 2017-08-25. Note: This is a simplified example and actual CNC machining programs can be much more complex, depending on the specific requirements of the product being manufactured.