Automated String Cord Cutter

thingiverse

https://youtu.be/yVl75aUS3DY https://youtu.be/ds7_uTPfOBs Automatic cord cutter. This cutter measures and cuts small cord to specified lengths. It uses a pair of rings to drive the cord off a spool and send it to the blade. The blade has a stack of quarters to provide the cutting force. In future versions I will try to reduce the additional required parts and hardware. Prints - Print 1 of everything, .3 resolution is okay. Print 2x spool holder pieces if using. Other required parts - -2 NEMA 17 motors - 2 or 3 axis Arduino control board - 12v power supply for stepper board - 1/8" nail or steel pin - 2x 1/8 x .5 OD rings - 1/4 OD spring or smaller - 1 M3x25 bolt - 1 M3x14 bolt - 10x M3x8 bolts countersunk - 2x M3 set screws - 2x 3x8 bearings - 1 to 10 quarters - razor blade Spool holder uses 3x 3/8 x 16 all thread. Minimum Arduino code - #include <Arduino.h> #include "BasicStepperDriver.h" BasicStepperDriver stepper_feed(200, 2, 5, 8); BasicStepperDriver stepper_cut(200, 3, 6, 8); void setup() { stepper_feed.begin(200, 1); stepper_cut.begin(200, 1); stepper_feed.enable(); stepper_cut.enable(); } void loop() { stepper_cut.setRPM(100); stepper_cut.rotate(200); stepper_cut.setRPM(300); stepper_feed.rotate(-2000);//distance of string stepper_cut.rotate(-200); delay(500); }