Hi, I'm new in Arduino, but I'm fascinated about all things are possible! I'm wondering if it is possible to make a machine to cut 600m coils of 5mm strong cord into 130m cuts. I made a machine turned by hand, but it is a very boring job to turn the spindle. Can anybody give me an hint how I can realize that the machine stops after 130m?

I use a counter [IMG_9903] I used a thrust bearing, which is quite noisy. So I will build a new one anyway. How do I measure the required torque? How do I use micro switch for counting revolutions?

[image] ole_0011: How do I measure the required torque? Attach a spring scale to the outer edge of the take up reel and see what force it takes to turn it with the max load from the bulk reel and counter mechanism. Driving from the edge of the take up reel will require less torque than driving from the center with a motor mounted underneath.

Is a stepper motor required or does any motor work? Just thought if an extruder for a 3D printer would work to transport the cord!? It has grip, but it will be very slow I guess

[image] A used vehicle gear window motor will have more than enough power for this project. A small protrusion (or 4) on the take up reel would touch the micro switch as the reel rotates. The Arduino will monitor the switch, counting the times it closes.

I still have a 12V car window motor at the shelf, looking the same.

These are great, I using them often in projects. FYI [image] Share tips you have come across General Electronics Mounting Hardware on Panels, Chassis, etc. It is almost inevitable that when you measure and drill holes in surfaces to mount motors etc., you never get things perfect. The following procedure should give great results to get holes in the correct position. Measure the hole locations needed for your motor, transfer these to a graph paper template Use this template to make a rough pattern on a piece of scrap material Make the holes in this pattern oversized with the motor still being ab… [image]

But what do you think, an extruder for a 3D printer would be too slow?? EDIT...forget it, it will be too slow...

[image] ole_0011: But what do you think, an extruder for a 3D printer would be too slow?? No experience with these but first thoughts I’d say yes, too slow. The window motor is quite fast, it’s speed can be control by PWM from the Arduino.

[image] LarryD: The window motor is quite fast, it’s speed can be control by PWM from the Arduino. Sounds like a hard job for a beginner :grinning:

One line of code. analogWrite(motorPin, analogRead(SpeedPotentiometer)/4); analogWrite() - Arduino Reference The Arduino programming language Reference, organized into Functions, Variable and Constant, and Structure keywords.

Cut cord in length

Other Hardware Science and Measurement

LarryD December 8, 2022, 8:31pm 19

These are great, I using them often in projects.

FYI

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Cut cord in length

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