Presentation on theme: "Metal Cutting Plasma Oxy Fuel Band Saw Sawz-All Portable Disk (Angle) Grinder."— Presentation transcript:
Metal Cutting Plasma Oxy Fuel Band Saw Sawz-All Portable Disk (Angle) Grinder
Plasma Arc Cutting (PAC) Cutting process that uses an arc and a high- velocity, ionized gas coming through a small nozzle to cut ALL metals Link:
CNC PAC CNC
PAC Plasma is a super heated gas that is ionized. Ionized- Electrons in the gas have broken away form their atoms and will conduct electricity.
PAC How it cuts The plasma gas (compressed air) is forced through a constricting nozzle and heated by the arc which reaches 18,000 to 25,000 °F Most plasma cutters require at least 70 PSI
Advantages of PAC Can cut ANY metal Torch can’t cut aluminum or stainless, PAC slices right through it. Super fast setup & cutting speeds Little distortion (warping) from heat No hazardous gasses (O2 or Acetylene)
Disadvantages Plasma Torch is expensive Portability (needs electricity & compressed air) 70PSI is need to run most PAC machines Metal fumes created can be a health hazard
Safety/ Maintenance A minimum of a #4-5 filter shield should be used Need proper ventilation to remove harmful fumes Do not allow Pilot Arc to continue for long periods of time
PAC Setup & Procedure Clean metal Hook up ground cable Draw cutting pattern or template on metal Place electrode as close to base metal as possible without touching. 1/16-1/8” from metal Position torch at a 70 to 90 ° angle Pull the trigger & pull torch across metal
Cutting Jigs * Clamp angle iron in place for straight cuts!
Cutting Speed Too Slow- Molten metal (dross) will collect on bottom Too Fast- Metal will not be cut all the way through Sparks may fly upwards
Dross Most will chip away Increases with slow travel speeds
Consumables Electrode Nozzle Swirling Ring (orange) Causes plasma to swirl While these parts are all referred to as consumables, it is the electrode and nozzle that wear and require periodic replacement.
Oxy-Fuel Cutting LINK
Oxy-Fuel Cutting A torch is used to heat metal to its kindling temperature. A stream of oxygen is then forced into the metal, burning it into a metal oxide that blows out of the kerf as slag.
Does Metal Burn? Virtually all materials will burn if they are first heated to their ignition temperature. Steel ignition temp is when it is cherry red, ° F Oxygen burns preheated metal and blows it away from the work piece.
Oxy-Acetylene Torch Setup
Oxy-Fuel Cutting Process Oxygen (green) 20-23lbs | Acetylene (Red) 5- 7lbs Open cutting valve to set oxygen Clean metal Draw line or make jig if straight cut is needed Hold tip ~ 1/8” above metal Preheat metal to cherry red color Open oxygen valve and push Angle tip slightly toward direction of cut
Straight Cutting Torch - Can’t convert for welding or brazing - Combination Cutting Torch OFC Equipment
Torch Tip Standard flame exits through outer ring. Oxygen blasts through center orifice
Carburizing Flame – to much acetylene, black smoke, too much carbon Neutral Flame – MINT! Oxidizing Flame - Too much oxygen, hear rushing air, very blue flame Flame Types
Bending Metal Metal ductility increases with heat. Easier to bend and form.
Hardening Metal Different steels have different methods Heat steel to ignition temp. ( *F) Test with magnet (loses magnetic properties) Quench in oil (peanut, mineral, motor) for “X” amount of time Immediately place in an oven to temper. Steel becomes very hard but becomes brittle You need to do your homework first!
Temperature Indicating (Heat) Sticks Identifies the temperature of metal Different sticks melt at different temperatures. Preheating metal before welding
Safety Proper PPE 4-5 Face Shield, pants, gloves, jacket Keep tanks upright & chained! Let tanks settle for at least 15 minutes after changeover. Stand to the side of regulators Always cap unused tanks Acetylene tanks ¼ turn max
Horizontal Band Saw (Metal)
Horizontal Band Saw
Types of Blades
Band Saw Blades Teeth Per Inch (TPI) More teeth/inch= hard metals Less teeth/inch= soft metals Blade Speed / RPM Soft materials: increase RPM Hard Materials: decrease RPM
Blade Tension Blade will seize in work piece if too lose. Blade may snap if too tight. Tool of choice for long cuts
Guide Adjustment Tool of choice for long cuts Adjust guides to ensure a straight cut. Blade will wonder on long cuts.
Band Saw safety Rules Burrs on cut pieces are sharp. Use special care when handling pieces with burrs Check for proper tension on the blade Secure piece in vice Check & adjust guards Use a brush to clean chips Keep your hands away from moving parts Stop machine before making adjustments
Band Saw Operation Mark metal where cut is to be made Mount solidly in the vice Support tail with jack stand Check tension and condition of blade Set guide as close as possible Turn on saw Slowly open gravity feed (use proper force) Lubricate with cutting oil Clean saw when finished
Vertical Band Saw Safety Rules
Safety Rule #1 Keep all guards in place.
Safety Rule #2 Adjust the blade guards to within 1/8” to ¼” of the stock.
Safety Rule #2 - Continued Blade guards that are over ¼ inch above the work will lead to accidents and reduces the accuracy of your cut.
Safety Rule #3 Maintain the stock flat on the table.
Safety Rule #3 - Continued Never hold the stock ‘above’ the table, the material must remain flat on the table surface at all times.
Safety Rule #4 Don’t cut round stock on the band saw. The round stock may roll into the blade causing an accident. Only the instructor should perform this task while using a miter gauge.
Safety Rule #5 Concentrate your attention on the job at hand.
Safety Rule #5 - Continued Do not interrupt others while using power equipment. Stay focused until the blade has stopped moving.
Safety Rule #6 Never leave the machine operating while unattended.
Safety Rule #7 Keep the work area clean.
Safety Rule #7 - Continued Scrap wood or tools on the floor or the bandsaw table will lead to accidents and injuries.
Safety Rule #8 If the blade comes out of the guides or breaks, stop the machine immediately by turning off the power. Do not open the access door to the machine until the wheels have come to a complete stop. Have the instructor reposition or install a new blade.
Safety Rule #9 Do not reach across the saw line.
Safety Rule #10 Never back material out of a cut until power has been turned off and the motion of the blade has stopped.
Safety Rule #11 Always use a push stick when sawing small stock.
Safety Rule #12 Do not hold the stock in line with the saw blade.
Safety Rule #12 - Continued Hold the stock to the sides of the cutting line.
Safety Rule #13 Keep your hands and fingers several inches from the side of the blade.
Safety Rule #13 - Continued Remember to keep your hands clear of the table insert.
Safety Rule #14 Use ‘relief cuts’ on tight curves to avoid breaking the blade.
Chop Saw Manually cuts metal with a fiber composite saw blade. Cut angles Link:
Safety Rules Always wear safety glasses Inspect wheel before each use Clamp all metal before cutting, adjust if necessary Support tail of stock with blocks
Safety Rules Watch where sparks are aimed Let cutting wheel do the work Do not cut pieces less than 6 inches.
Blades Inspect blade before each use. Chips, cracks, etc. Remove blade when it reaches ½ of its original diameter. Do not over tighten blade
Cutting Angle Iron Make sure the peak is facing UP
Cutting Flat Bar Stock Width of bar should be vertical.
Cutting Channel Iron Base of material should point up
Reciprocating Saw (Sawz-All)
Blades Always use the right blade for the job. Unplug the tool before making adjustments. Don’t carry the saw by the cord. The blades get HOT!
Safety Always rest the heel on the work piece. Prevents binding & kickback
Blades Applications are identified by labels on the packaging and blade. Most Common: Wood Metal Multi-purpose
Hand Tools Tin Snips Aviation Snips Scribers Steel Blue Soap Stone Paint Markers
Aviation Snips Left, Straight, Right Red should cut Right, but it doesn’t.
Layout Tools Scribe Scratch-Awls
Layout Fluid Fast drying ink Scribing or punching Magnifies marks Remove with steel wool or alcohol
Identification Tools Soap Stone Paint Marker
Stamping Stamp your initials on projects or pieces ONE blunt hit with a hammer Solid surface
Summary Follow the safety rules. Use the laboratory tools only for their intended purpose. Follow the directions and safety guidelines as listed by the machine’s manufacturer. ASK QUESTIONS!!!!