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Fundamentals of CNC Machining
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© 2011 Autodesk
2.0 – Shop Safety
© 2011 Autodesk
Lesson contents
• 2.1 – Safety Awareness• 2.2 – Personal Conduct & Shop Etiquette• 2.3 – Appropriate Shop Clothing• 2.4 – General Safety Practices• 2.5 – CNC Safety Practices• 2.6 – Safety Contract
© 2011 Autodesk
Objectives
• Display awareness of shop safety.• Apply general safety rules.• Select appropriate shop clothing.• Demonstrate safe personal conduct in shop.• Apply additional precautions when running a new CNC program.
© 2011 Autodesk
2.1 - Safety awareness
• Machine shops have many hazards.• What you don’t know CAN hurt you.• Avoid over-confidence and assumption.• Be careful and methodical.• Cultivate an attitude of safety.
Think
© 2011 Autodesk
Common hazards
• Cutting tools are very sharp.• Can cut if improperly handled.
• Spinning tools are extremely dangerous.• Tools can shatter.• Chips produced by machining are sharp.• Machining throws off hot, sharp chips at high speed.
ThinkSafety
© 2011 Autodesk
Common Causes of injuries
• Flying chip => eye injury.• Chips on bench => cut hand.• Chips on floor => cut foot.• Not looking where your hands are moving.• Distraction – Inattention.• Using equipment without proper training.• Long hair catching in rotating machinery.
Look ForDanger
© 2011 Autodesk
Preventing injury
• Know where your hands are at all times.• Best practice: Put your hands in your pockets when not working.
• Look before you move.• Move deliberately - cautiously.• Always ask yourself, “What happens if…”
• Tool slips?• Hand slips?• Feet slip?
BeAware
© 2011 Autodesk
2.2 - Personal conduct
• No horseplay or practical jokes allowed!• Do not engage in unnecessary or loud talking.• Do not interrupt others unnecessarily.• Keep a clean work area.
BeSerious
© 2011 Autodesk
Shop etiquette
• Never borrow tools without first asking.• Respect the professional Machinists.• Don’t make unreasonable demands (“I need it yesterday”, etc.)• Clean up after yourself.
• Best Practice: Leave workspace at least as clean as you found it.• Put away all tools.
• Wipe clean first.• Put where/how found.
BeProfessional
© 2011 Autodesk
Planned Break
Any questions so far?
© 2011 Autodesk
2.3 – Proper Shop Attire
1. Hat or tie back long hair.2. Wear Safety glasses (Always).3. Ear Plugs (As needed).4. Wear short sleeve shirt and tuck in.5. Remove watch.6. Remove rings/jewelry.7. Wear long pants.8. Leather shoes best.
© 2011 Autodesk
2.4 – General Safety practices
• Never use equipment without proper training!• Do not tamper with safety devices.• Keep the workplace clean.• Handle tools with care.• Don’t start the machine before checking area is clear.• Don’t use unsafe work-holding.
© 2011 Autodesk
General safety practices
• Wear safety glasses at all times in shop.• Not just at CNC machine.
• Know how to use Emergency Stop.• Never work alone.• Only 1 person in charge of machine at a time.• Never use hands or air hose to clear chips.
• Best practice: Use a paint brush instead.
© 2011 Autodesk
General Safety practices
• Clean spills immediately.• Store oily rags in fireproof can.
• Oily rags can spontaneously combust .• Lift with legs, not back.• Do not lift heavy objects alone.
• Get help or use a lift.
© 2011 Autodesk
2.5 - CNC Safety practices
• Never leave CNC machine running unattended.• End program with part nearest operator.
• So you don’t have to lean far into machine to load/unload part.• Remove tools from spindle at end of day.• Avoid contact with coolant.• Immediately wash and treat cuts.• Report all injuries.
© 2011 Autodesk
“First article” safety
• Use machine rapid and feed override.• Ensure Tool Length Offsets (TLO) correct.• Ensure Fixture Offsets correct.• Extra caution at starts & tool changes.• Keep hand near E-Stop.• Stop machine at first sign of trouble.
© 2011 Autodesk
Summary
• What you don’t know can hurt you.• Never use equipment you have not been trained to use by qualified
instructor.• Wear safety glasses or goggles at all times in the shop area.• Wear appropriate shop clothing.• Exercise caution when running new programs. • Be professional and serious.• Practice good etiquette when dealing with peers and shop
personnel.• Obey all shop regulations.• Cultivate an attitude of caution and safety.• Be mindful at all times.• Nothing is worth hurting yourself to get done.