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Tools/plasma/induction: Difference between revisions
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{{inductioninfo}}
Induction for the [[Tools/plasma|CUT-50 Plasma Cutter]]
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! Topic !! Detailed Contents !! Rationale
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| Proper Clothing ||
Preferably workshop overalls and safety boots but if not :-
* Stout leather shoes that you don’t mind getting messed up, no trainers, no open-toed shoes
* Jeans or similar heavy cotton trousers, must completely cover legs, no holes
* Cotton shirt, long-sleeved preferable but not essential
* All clothing is going to get dirty, dusty and possibly burn marks
* For fire-safety reasons - NO SYNTHETIC FABRICS
|| Staying safe from the hot metal spray
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| PPE and why ||
* Overalls (sparks, UV)
* Boots (sparks, dropping things)
* Welding Gloves (sparks, hot metal parts)
* Ear protection (Loud noise/ultrasonics for long use)
* Goggles or welding mask (UV, flying sparks, grit, dust)
* Dust mask (Dust, metal fume headaches)
|| Protection from the specific hazards
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| Area Safety ||
* Fire precautions
** Clearing area of flammables
** Getting fire extinguishers handy
*** Everyone knows how to use one?
* Sounds level warning to other people
* Dust warning to other people especially if cutting anything other than carbon steel
* Good ventilation because of Ozone/NOx/Metal fume
|| Keeping other people safe around you
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| Electrical Safety ||
* Avoiding wet areas (but mention industrial water-damped cutting)
* The plasma cutter plugs into one of the 16A sockets on the pillars. If you need an extension lead use only the high-current industrial ones from drawer B1B of the metal table
* Main terminal on power supply is live all the time at 100V, ensure the guard is in place at all times
* NO RINGS, NO WATCHES!!
* If something does go wrong, shut off power before anything else
|| Let's not get anyone electrocuted
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| Metal fume/dust hazards ||
* General hazards of fine dusts, tendency to respiratory issues and headaches, need for for dust masks
* Hazards of galvanised metal, properly preparing galv and cleaning it
* Why are we restricted to carbon steels? (Cr2O3, Al2O3, NiO, CuO etc.)
** Is there interest in cutting other materials? (Will organise if wanted)
|| Metal dust and fume are long term health risks
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| Basics of plasma cutting ||
* What is plasma, how and why does it cut through metal
* What can be cut - Any metal, but safety issues on anything other than plain carbon steels
* Inspecting compressor and cut-50
** Looking for any defects or damage
** Are the shields and guards in place?
** Checking compressor oil level
** Venting the compressor
** Are the regulators all the way out?
** Testing the compressor safety valve
** Are the hoses and cables in good condition?
* Fitting the consumables, how to examine, check, what constitutes too much wear, show examples of excessive wear if we have any available. Consumables need changing quite often on these cheaper plasma cutters
* Connecting up the equipment, noting that the air source needs to be reasonable clean and water-free, what will happen if it isn't
* Torch safety, electrical hazards, air injection issues, firing out of grit and possibly parts of the head if damaged, must never be pointed at people
|| Basics of how the process works and is used
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| Proper settings for the job ||
* Selecting proper pressure and how to cascade the regulators to give smooth regulation.
** Pressures range from around 3 bar for thinner material up to around 8 bar for thicker material
* How to choose a suitable current for your job
** Theoretically you should use 10A + 5A per mm of material thickness for steels, more for aluminium or copper
** But this cutter's gauge reads "Chinese amps" so use about double that
** But the breaker will trip if you select over about 42A so that's your upper limit
|| Getting the settings right for a smooth cut
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| Cutting ||
* Preparing material using angle grinder/wire wheel
** Consider contaminants
** Getting good ground contact
** Using guides, both metal and wood, possibility of laser cut guides
** Clamping work consider what’s underneath and on the underside
** Torch perpendicular and slow even movement
** OK to brace on the material
|| The main procedure for actually cutting into things.
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|How to recognise problems||
* Demo on thin sheet
** Show a good cut, too much current, too little current, too little air
** Practice on thin sheet till it's working well
** Piercing through thin sheets
|| So you can recognise issues when they happen
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|Cutting on thicker materials||
* Cutting speed and watching spark angle (15-20 deg) if possible
* Flick-finishing
* Piercing thicker sheet at an angle
* Descaling use
* Demo & Practice
* Maximum thicknesses that can be cut
|| Cutting thicker materials at lower speeds
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| Other topics ||
* Piercing into enclosed spaces and blow-back hazard
|| Miscellaneous other topics
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[[Category:inductions]]
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