I am trying to build a ribbon cutter like this. I have completed the rest of the machine with the use of an Arduino and a couple of DC motors.
I'm stuck with the hot blade. I am not well versed with heating. Initially I tried to use a nichrome ribbon (5mm width 8cm long) with a transformer, but I got stuck as I could not figure out the resistance of it (I cannot measure it with a multimeter) to identify a suitable transformer.
I am thinking of using a soldering iron filament (40W) and fixing a brass blade to the tip.
This is how I have done the calculations:
- c=375 J/Kg C for brass
- weight of blade 10g (0.01Kg)
- I need the blade to heat upto 300 degrees Celsius to cut through the polyester.
To heat the blade to 300 degrees Celsius the energy required is 1125J.
- Energy = Watts * seconds
- 1125J / 40W = 28.125 s
The blade should reach 300 degrees Celsius in less than 30 seconds. Is this correct? my instinct tells me it will not happen.