40$ SCARA Arm

pinshape

This SCARA robotic arm is perfect for programming projects. Considering it costs under $40, its strength may not be extremely high, but the cost makes up for it. I chose materials based on what I already had in stock, which is why I used reed sensors and $3 stepper motors. The top plate ("top.stl") works well with either a stepper or a 360 servo to handle Z movement. If you're using a servo, you'll also need to print the rev counter (“rev_counter.stl”) and add an extra magnet and an extra reed sensor. With a stepper, just an extra coupler is needed. For convenience, I recommend the second solution (also because it's simpler to program). I left a thread hole at the end of the arm so you can design your own modules and share them with the community. Converting the steppers to bipolar function will give them more torque and let them work directly with Arduino RepRap and CNC boards. To do this, follow this tutorial. Unfortunately, I didn't write any demo program (I'm not a big fan of programming). If you like this model and want to see it move, write some code and share it please. If you have questions, just leave a comment and I'll answer as soon as possible. If many people ask about the assembly process, I'll make a video tutorial. Material: - 3x 8mm steel bars (choose your length) - 1x M6 threaded bar - 6x M6 nuts - 12x M4 nuts - 2x M4 25mm screws - 9x M4 20mm screws - 34x 8mm steel balls - 2x M3 plastic screws - 1x M4 50mm screw - 2x 22mm bearing - 6x 8mm linear bearing - 1x 7mm x 20mm spring - 1x button - 1x micro bearing Configuration one: - 3x reed sensor - 3x 6mm magnet - 2 stepper - 1x 360 servo Configuration two: - 2x reed sensor - 2x magnet - 3x stepper - 1x coupler Printing settings (BQ Witbox): 200 micron 60 mm/s supports everywhere