This device controls the speed of two stepper motors (via dedicated motor controllers) to achieve tape winding around tubular object (a tube, pipe or similar). One stepper is turning main shaft at some speed, while other stepper is turning screw shaft which moves the tape along rotating tubular object and thus winding tape around it. Something similar to sketch below, but screw shaft is not driven by chain but second stepper motor.
Speed of main shaft and pitch of second shaft with screw can be changed at any time (in operation and while idling).
Device looks like this: main controller + 2 (stepper controllers + steppers)
Since I only made one piece of this device, I made it on single side PCB with CNC router made traces. Board layout is quite simple: power supply, Arduino which controls everything, simple lcd, 4 buttons and terminals.
Below is a video with controller in action whith additional explanations if someone is interested:
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