Hello im trying to come up with a on off switch that will slowly turn a motor or servo when the filament / string is pulling tight.
I thought having a switch that pushes in when touched and released when not touched would work, as acway to know when the strand is being pulled as it will be a tight line, but the spool filljng / emptying changes the height on 1 side, also if it bends the slack upward it will trigger the motor from a false touch.
How can i activate a motor/ servo so the strand is not being tugged more than the second it runs out of slack?
I tried to make a drawing of a textile "dancer" used on bobbin winders. A potentiometer with a wire hook or eye through which the yarn (or filament) is run moves up and down with tension, turning the pot which controls winder (motor) speed.
Its for larger 2kg spools of 3d printing filament or even smaller rolls that are mounted where it cannot be avoided and has to be fed through a sharp turn elbow, that causes extra friction on the strand and requires the extruder to pull harder.
Im making my own air tight dry case to store the rolls and want to add in something to detect when the 3d printer is pulling on the spool, so that a motor on the axle the roll is mounted on will turn giving 6 or so inches of slack so the extruder only has to pull the slaked bit, and not also rotate the filament carrage its spun around.
This is also for the need of my manual 3d pen where if theres no slack the in pen extruder jerks akin to a fish taking the line fishing.
