What final electric test should always be performed on power tools especially those power tools with a metal case, like circular saws?\n\n\nA leakage test\n\nA current test\n\na motor resistance test\n\na line cord continuity test
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If the right answer is Leakage/Grounding test, it would not shock me!
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Using two or three standard cylinders of helium mixed with air or CO2 as a tracer gas the generator can be tested, repaired and re-tested prior to being filled with hydrogen for operation.\n\nLeak testing of operational generators is easily accomplished using one a hydrogen detector. This test is performed in the same manner as the helium test and provides similar test sensitivity.
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Someone has used a gasifier and captive-piston engine to make a one-moving part alternating-current generator. The piston is magnetized and the coils are in the body of the cylinder. The trapped air in the cylinder at each end of the piston acts as an air shock to eliminate rebound and impact damage. No sensors needed. No make and break circuit. The voltage drops to zero at the end-points of travel of the piston. Search on this and you can probably find the same one I saw. I think this is where they got the idea for those new shake-up LED flashlights.
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Another rule of thumb is to assume 100% load. \n\nNot knowing what kind of "electric motor calculations" you are going to make it is difficult to say what load factor you should use.
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Electric Discharge Machine
420699
Testing for weed\nhttp://www.marijuana.org/BeatDrugTesting.htm
663112
Go to a pool store and buy some test strips.  Lowes or Home Depot may stock them.
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Look for caliper (spelling counts).  Specifically, Vernier Caliper, and micrometer.  \n\nThose are the two major precision measuring tools.  Try the starrett.com web site.  They have a sterling reputation for quality.
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Stray voltages/currents between grounded metal parts is caused by a difference in resistivity. Usually, it is because the ground rod has a greater resistivity than the metal parts connected to the water/drainage/gas system.\nAgain as has been said on other occasions in this forum, Ohm's Law comes into play..... Current is equal to voltage divided by resistance. So if there is a differing resistance between the two systems AND there is a low resistance path betweeen the electrical wiring and earth on an appliance, current will flow (continuously) to the frame of the appliance and to ground. So if current is flowing to ground and the appliance ground has a higher resistance to earth than the ground of the adjacent metal parts there will be a difference in potential between the two. This is often felt as a tingling sensation --- The reason why it doesn't trip the breaker is that the current flow is lower than the trip setting of the ELCB (earth leakage circuit breaker). It does not have anything to do with "Back EMF" back EMF is the voltage generated in a dc motor that limits the amount of current that can pass through the armature windings.......\n\nIf you have this problem, GET AN AUTHORIZED ELECTRICIAN TO INVESTIGATE AND CORRECT THE PROBLEM IMMEDIATELY. It certainly is a dangerous situation that can cause death.\n\nSource: Electrical Engineer (ret) with 45+ yrs experience.
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What context?\n\nMaybe this?\n\nhttp://en.wikipedia.org/wiki/Residual-current_device
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Non-destructive testing (NDT) aims detection and characterisation of defects /flaws / discontinuities in a material without impairing the intended use of the material. Eddy Current Testing (ECT) is an  electromagnetic NDT technique widely used in nuclear, aerospace, power, petrochemical and other industries to examine metallic plates, sheets, tubes, rods and bars etc. for detection and sizing of cracks, corrosion and other material discontinuities during manufacturing as well as in-service.\n\nThis is not a volumetric (radiography and ultrasonic) technique. Like liquid penetrant and magnetic particle techniques, this is a surface technique and can readily detect very shallow surface defects (fatigue cracks, intergranular stress corrosion cracks etc.) and sub-surface defects (inclusions, voids etc.) within  a depth of, say 6 mm. Eddy curent testing is a simple, high-speed, high-sensitive, versatile and reliable NDT technique.
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I tried to import a spreadheet for you but I coouldn't make it come through, if you email me I'll send it to you, like1m@yahoo.com  \n\nYou can fill in the two variables, just write it in excel and you will be able to calculate your values for voltage and current dependent on the resistance for any given values.  All answers here are correct as it is the basic premise of \nOhms law, but you asked for a chart.  You do need to know the resistance though.  The interrelation is such that for at a given voltage with infinate resistance there will be no current (flow), for that same voltage with minimum resistance there will be maximum current (flow) this would be referred to as a dead short and is comparable basically to welding. Either extreme is not normally practical unless you are turning the power "off" in one case or welding in the other (dead short).  Dependent on the requirement usually the interrelation is desired to be somewhere in the middle.  There is also the element of reactance which is slightly more dynamic that static resistance. but for now this is what your auto calc chart should look like....  \n\nInput ohms & volts to autocalc Amps\n\nInput OhmsInput VoltsI=V/R\n      200                     24                 0.12\n\nInput ohms & Amps to autocalc Volts\n\nInput OhmsInput AmpsV=I*R\n    200                     0.12                   24
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There are many tools on the market for all types of tasks so I fail to see why you cannot just buy something. it's most likely that an "off the shelf" tool will work out cheaper and better.\n\nTo discus the options, you say electric operated so the hydraulic or pneumatic would require a separate electrically generated source, presumably you don't have so this would be very restrictive (expensive). \n\nIf the duty is fairly light an electric tool would be best however more power may be better to go to pneumatic. Hydraulics are rarely used in tools except where this type of power is already available such as rock breakers on excavators.
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Always the current. The voltage can be whatever.
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make sure you know the material you are being tested on
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pnumatic testing is testing having to do with AIR PRESSURE\n\nhow much air pressure is inside something at any given time how much is being exerted on the outside of something and or how much pressure can it contain b4 it will rupture.
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Hmmmm, It looks like Mr. dmb06851's engineering class has been given some tough home work again. Well, I gave Jenny one so I'll give you one. Again, it depends on the saw style. A regular circular saw would most likely have a Spur or Helical gear in it since the arbor shaft is parallel with the motor shaft. How ever, in a "rip saw", that is still considered a household tool, will have a Helical/bevel/worm gear in it. That's right, A worm-gear drive shaft that's beveled(cone shaped) that rides on the beveled face of the driven gear. Dewalt uses a straight worm gear that rides on the outer circumference of the gear but Makita uses the helical/bevel/worm.