Week 7:Computer-Controlled Machining
Assignments
Group Work : Complete your lab's safety training Test runout, alignment, fixturing, speeds, feeds, materials and toolpaths for your machine Document your work to the group work page and reflect on your individual page what you learned
individual assignments:Make (design+mill+assemble) something big.
Group Work Assignment Reflection
The big different between the two CNC machines
I try to learn two CNC machine which are from different brands, one is the Chaihuo machine and the other is from our school‘s lab.
The Chaihuo machine is a TIANCHENG XINLI Wood CNC engraving machine TC1325B.
This machine need fix the board on the machine tightly,otherwise the board may shift positions that will affect the cutting results.
This CNC machine requires manual tool head changes， after change the tool head, we need to lock the tool head box.
The other is CNC Router STM1530D-4A: Working area 1500 mm × 3000 mm
The machine from our school' lab with vacuum system to help the board to be mounted well. So normally we don't need to use clamps to hold the board tightly.
The wheel on the controlling pannel is very useful for adjusting the position of the head slowly and gradually, to protect the machine from being damaged. And it's very easy to use.
The CNC machine from our school' lab has a automatic tool head replacement system, so the replacement is an automatic process.
CNC Machine: Set work and tools offset, this step tells the computer the exact location of the part and tools. Define the origin point, by aumo moving the CNC mill,and then set the thickness of the materials.
Safety Training
1.Personal Protective Equipment (PPE) & Dress Code Safety Glasses: Always wear approved safety glasses with side shields, even if the machine is running automatically. No Gloves: Never wear gloves while the machine is running. They can get caught in rotating parts and pull your hand in. Proper Attire: Wear a fitted lab coat or work apron (buttoned up). Roll up long sleeves or wear short sleeves. Remove all jewelry: rings, watches, necklaces, and bracelets. Secure loose clothing and backpack straps. Hair Restraints: If you have long hair, it must be tied back and tucked into a cap or hairnet to prevent it from being pulled into the spindle. Footwear: Closed-toe shoes are mandatory. No sandals or high heels.
2. Machine Operation Procedures Supervision: Never operate the machine without an instructor or supervisor present in the room. Machine Guards: Keep all safety shields, doors, and plexiglass guards closed and locked during operation. Inspection: Check the machine for any damage or loose parts before starting. Ensure the workpiece (stock) is clamped tightly in the vise or fixture. Verify the tool is securely locked in the spindle or tool holder. Setup Verification: Double-check your CNC program (G-code) for errors. Perform a "Dry Run" (running the program without the workpiece or at a very high Z-axis offset) to check for path errors. Always confirm the "Zero" or "Work Offset" is set correctly.
3.Emergency Procedures:
Train all operators on the location and use of emergency stops on the machine.
Ensure knowledge of first aid procedures for burns, cuts, and other potential injuries.
Regularly review fire evacuation routes and procedures.
Individual Assignments
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Gallery
