Metal hand Saw machine
thingiverse
Using a car battery, a light switch, a car window wiper motor, and a 3D printer, I've created a simple automation for the metal handsaw. For even, straight cuts of INOX 316 & 304 linear rods, electric tools were too violent, resulting in ugly sawcuts, burr, and slivers. This is my $60 weekend solution to a +$300 slow-cutting metal saw. I figured that adding an arm to the wiper motor could make a circular motion into a repetitive, linear one. The next step was the math. If I added an arm with a radius of half the distance the saw needed to back and forth, the complete diameter would bridge that needed distance. The saw needed to go 13cm and 7mm back and forth. So the motor's arm diameter from center to M3 pivot hole at the end is 137mm/2=68.5mm. I can saw about 2x 8 hours before the battery tells me to do it myself. So I've searched the web for a simple solar tracker Arduino sketch, uploaded it to an Arduino Pro Mini 16MHz, acquired a set of LDRs, fished a servo out of my model-building shoebox, and sketched a solar tracker as well. It moves an $18 AliExpress 18V 18W solar panel. An $8 solar charger charges the car battery. At sunny days, it charges the battery in 4 days. Car Battery: $50 Car Battery Clamps: $4 Leads: 2.5mm² copper insulated music wire Solar Charger: 20A: $8 Solar Panel 18V 18W: $18-$22 Arduino Pro Mini 16MHz: depends on original or clone, but I suggest the original. Clone producers don't use their income to figure out new things for us. $5-$16 LDR: Low sensitivity LDRs. (The cheaper, the less sensitive, but both work with correct resistors) $2-$6 Bearings MR93ZZ x8: price depends on where you source them, I guess. Watch this video: https://3d-printersvdb.be/video-gallery/ As you can see by looking at the files, the assembly has been upgraded since the pics and vid. It's stronger now. 3mm wide plastic bent, but it got ripped apart after a while.
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