Hi folks, new member here who needs a dead simple potentiometer-controlled circuit for hot wire to cut polystyrene foam.
My DIY standard cutting bow is about 30" in wire length. I'm using a 2 cell lipo for the power source (nominal 7.4v), and it works quite well. However, I need fine control of the volts/amperage to get a really smooth cut. I'm using nichrome wire 0.4mm/27 swg which has a nominal 8.6 ohms/mtr resistance(?).
It would also be really handy to be able to make much smaller cutting tools using much shorter lengths of stronger wire, say 0.6mm(?) for smaller cutting jobs if the same pot will handle it..?
I need to have fine control in the, say 7.5v to 8.5v range. It's important to keep the amperage in a tight range of approx. 0.8 - 1.3 amp(?). to get a nice smooth, slow cut. So a pot capable of handling say, 12w max. is needed.
I've seen a hobbyist on Youtube who uses an R/C servo controller and a brushed motor ESC (difficult to get nowadays) to achieve fine control, but I can't quite see how he's got it wired in to the circuit!
Can anyone point to me to a potentiometer with whatever product code/spec. I need, please?
My DIY standard cutting bow is about 30" in wire length. I'm using a 2 cell lipo for the power source (nominal 7.4v), and it works quite well. However, I need fine control of the volts/amperage to get a really smooth cut. I'm using nichrome wire 0.4mm/27 swg which has a nominal 8.6 ohms/mtr resistance(?).
It would also be really handy to be able to make much smaller cutting tools using much shorter lengths of stronger wire, say 0.6mm(?) for smaller cutting jobs if the same pot will handle it..?
I need to have fine control in the, say 7.5v to 8.5v range. It's important to keep the amperage in a tight range of approx. 0.8 - 1.3 amp(?). to get a nice smooth, slow cut. So a pot capable of handling say, 12w max. is needed.
I've seen a hobbyist on Youtube who uses an R/C servo controller and a brushed motor ESC (difficult to get nowadays) to achieve fine control, but I can't quite see how he's got it wired in to the circuit!
Can anyone point to me to a potentiometer with whatever product code/spec. I need, please?