Acu-Rite CNC 3500i user manual Writing Programs

Writing Programs

The 3500i allows many features to be used without having to write a program. But for operations that repeat or complex machining it is best to write a program. Before you start to write a program, determine the work-holding device and the location of Part Zero (the point to which all movement is referenced). Since absolute positions are defined from Part Zero, try to select a location that directly corresponds to dimensions provided on the part print, such as the lower left corner of the work. Then, you can develop a program using a procedure similar to the one that follows:

The first block of a program is a safe starting position. This is where the tool-change position (a location away from the work area where the axes can return for safe tool changing) is input. The first block includes the units of measurement (Inch/MM), mode of operation (Absolute), move type (Rapid), and to cancel all auxiliary functions (Tool Offsets, Spindle, and Coolant). This is the same as in g-code (e.g. typical first blocks: G70, G90, G0, G28, Z0, & M5). Refer to chapter 11 "G-Code on page 364”.

Subsequent blocks in the program set Spindle information, call Tool number, turn on Coolant, and make the initial move toward the work.

The remaining blocks in the program describe the required moves, Canned Cycles, and Tool changes to complete the machining.

The next to the last block in the program returns the axes to the Tool change position, turning off any auxiliary functions (Tool Offsets, Spindle, and Coolant). The last block , EndMain, (M2) ends the program. This is the same as in g-code (e.g. typical last blocks: M5, G0, T0, X0, Y0, Z0, M9; M2). Refer to chapter 11 "M-Code List on page 368”.

After writing a program, verify it. Run it in Draw Mode to troubleshoot for errors. Verify that all programmed moves are safe, and accurate to the part print dimensions.

Load the stock material into the selected work-holding device.

Set the Tool Offsets for each tool in the Tool Page.

Before running the part in the Auto Mode, run it in Single-Step Mode to verify that both the program and the setting of Tool Offsets have been correctly completed. Single-Step Mode allows you to execute the program block-by-block.

After testing the program, make any necessary corrections.

When the finished program is ready for production, back it up on a USB memory device.

1.1 The 3500i

ACU-RITE 3500i 5