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5_doe_instructions.20091012.4ad353acef8e12.30212473

5_doe_instructions.20091012.4ad353acef8e12.30212473 - ME350...

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ME350 – DoE Lab Instructions 1 Objectives The objectives of this lab are to: (1) Become familiar with using a CNC lathe to perform a turning process (2) Become familiar with the Starrett procedure to measure surface roughness (3) Become proficient at utilizing Design of Experiments methodology to predict the surface roughness of machined aluminum bars based on varying parameters 2 Lab Structure 3 Turning Aluminum Workpiece The remaining sections of this handout guide you through the steps for the DoE lab. Instructions are provided for using the CNC Turning to machine a cylindrical aluminum piece, for utilizing Starrett machine to measure the surface of the workpiece, and finally for using Design of Experiments methodology for predicting the surface roughness for an aluminum workpiece using the experimental data. 3.1 Configuring the Turning Machine Each group will be given a cylindrical aluminum workpiece. Based on the G-code on the lathe, namely O0700, the turning machine will machine 8 different sections on the cylindrical part. These 8 sections each represent a different combination of 3 parameters of the system: (i) Feed rate, (ii) Cutting Speed and (iii) Lead Angle. (1) If the machine is not ON, turn on the machine power from the black switch on the right side of the turning center. The computer will now boot up. This takes a few minutes . Machine cylindrical workpiece on CNC Lathe Use Starrett machine to measure and record surface roughness in 8 regions of the workpiece Work through the provided DoE example to learn the DoE procedure
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ME350 –DoE Lab Instructions (2) When the EMCO software is open, the screen will prompt the user to initialize the door. Press the T button while simultaneously pulling the door open. Then release the button and close the door, and the door interlock will be initialized. It is this door interlock that prevents the machine from cutting unless the door is closed. (3) The screen will prompt the user to switch on the auxiliary drives. Press the green AUX button key to do so. (4) The screen will now prompt the user to reference the machine. Turn the upper of the two knobs on the control panel to the reference setting. First, press +X key, and then the +Z key. The turret should move after each key is pressed, and this action tells the system where tools are currently located.
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