RPM Company Rental Application 2008-2024 free printable template
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Did you know you can measure RPM using just a mobile phone or a tablet The App I'm using for thesis called Spectrum Analyze, and it's a free App though I paid a dollar to unlock some very useful features Let's measure the RPM of my pointer So the fundamental frequency of this pointer appears to be 240 Hertz and that repeats every 240 Hertz if we look here That is at 480 so a twice that so basically is what our residence is to that main frequency and that's the rate at which the knives go past the table So let's go to the calculator, and we have 240 Hertz and I know there are three knives on the head, so it turns 80 times per second time 60 4800 RPM on the cutter headset the table saw So we have a very strong fundamental peak at about 3020 hertz so 3020 divided by40 teeth on the blade is 755 turns per second times 60 seconds in a minute is 4530 RPM Now it's not quite that straightforward you kind of have to know what you're doing and know what approximate RPM you're looking for cause if I zoom way out on this you can see all kinds of peaks here these are multiples of the tooth frequency because they don't just excite the frequency of the teeth but also essentially harmonics of it And if we zoom in way on the left at the lowest frequencies we see some weaker peaks there for instance this one hardhat's at 120 hertz and that's essentially Justine hums from the motor This sort of line home is quite common There is also 120 hertz coming from the transformer in this battery charger Transformer hum is always double the frequency, so the transformer gets 60 hertz and then the next field will vary 60 times per second but as the magnetic field maximizes in one direction the force is maximum then as it crosses zeroth force is nothing but then as it goes in the other direction the force is again the same amount so for every cycle that goes both up and down the magnetic field peaks zero twice, so you get twice as many peaks in the magnetic field causing a hum of twice the frequency Next less measure this dust collector So we have some interesting peaks we have one at 354 hertz and there's one back here at very low frequencies this one is at 59 hertz, so it works out that 354 is 59 times six and that tells us this improbably the motor frequency the rate at which the motors turning around this is for the vanes so that the impeller on this blower has six vanes causing six times the frequency, so we take the 59 turns per second times 60 is 3540 RPM but if we look at the tug on the motor it says 3450 RPM and I know the no load speed of these motors is 3600 RPM it's rated for 3450, and it's actually running at 3540 So the rate at speed is958 percent idle speed and the actual speed is983 percent idle speed, so it's rated to run 416 percent below idle speed but is actually running at166 percent below idle speed so basically the speed drop from idle is only 40 percent of what it's rated for which is to say this motor currently is only 40 percent loaded So we have a...
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