2_cad-cam_g-code.20090812.4a8381d65abe78.43011312

2_cad-cam_g-code.20090812.4a8381d65abe78.43011312 - ME350 -...

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ME350 - CAD/CAM Lab Instructions: G-Code 1 Objectives The objectives of this lab are to: (1) Understand the steps in generating G-Code for use in a CNC mill. The G-Code will be used in next week’s lab to machine your part out of an aluminum block, which will then be used as a mold for the injection molding lab. (2) Understand the parameters that are required to generate G-Code. (3) Understand the difference between roughing, re-roughing, and finishing sequences and why they are used. 2 Lab Structure 3 Generating G-Code for Your Part Ask your TA to verify if your part can be machined before moving on. 3.1 Establishing Coordinate System (1) Open Pro/E (2) Choose File Set Working Directory and choose a folder you can access easily. My Pictures is suggested. (3) Using Windows move both the original workpiece .prt file, (BLANK_AL.prt), and the reference model .prt file that you created into this folder 1 Open your part in Pro/ E and establish an appropriate coordinate system Setup the machine properties, including tool types and the milling window Generate tool paths for roughing, re-roughing, and finishing sequences Machine part out of aluminum using CNC mill (next week) Generate and modify G- Code. Save as .tap and give to your TA
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ME350 - CAD/CAM Lab Instructions: G-Code (4) In Pro/E choose File New Manufacturing and give it a name. The Manufacture Menu Manager comes up on the right of the screen. The first step is to select the part and the workpiece. (5) From the Menu Manager in the upper right hand corner of the screen choose Mfg Model Assemble Ref Model . Choose your part. Click Open. (6) Change the Constraint Type from Automatic to Default from the drop down menu at the bottom. Click the Green Check Mark (GCM from now on). (7) From the Menu Manager in the upper right hand corner of the screen choose Mfg Model Assemble Workpiece . Choose the original workpiece. Click Open . (8) Select Default from the drop down menu for Constraint Type. Click the GCM . Click Done/Return. Now Pro/E knows what are the beginning and ending parts. We will now create a new coordinate system that corresponds to where we will zero the mill. (9) Use the Datum Coordinate System Tool on the right to create new coordinate system. (10) Orient your part as shown in the example in Figure 1 below Figure 1 – Orientation for Machining Coordinate System 2
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ME350 - CAD/CAM Lab Instructions: G-Code (11) Hold down the control key and select the three surfaces in the order specified in Figure 1. Then use the Orientation tab in the Coordinate System window to flip the X axis . Click Ok . When finished, your coordinate system should look like the one in Figure 2 below with the Y and Z coordinates pointing away from the part. The X axis should start along the surface were your mold will meet the sprue-runner-gate system and run along the edge of your block. Figure 2
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2_cad-cam_g-code.20090812.4a8381d65abe78.43011312 - ME350 -...

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