Crusher Code Issues

@will Well I figure the motor is still under warranty! 🙂 Got to get it back on task and get it to go 1500 RPM under a single rotation. The RPM gauge only works if the motor is spinning continuously and you have to put reflective tape to get it to work. Don't know enough about software to get the motor at 1500 RPM under a single rotation. 

@clark77494 Just a thought, I would google 'howto make xyz motor turn at 1500rpm using an arduino' replace xyz with your motor descriptor.

@clark77494 

By "get it to go 1500 RPM under a single rotation", if you mean spinning it up from standing idle to rotating at 1500RPM by the end of the first rotation - I seriously doubt that's possible considering the weight of the rotating part of the motor and it's consequent inertia.

You can wait until the motor spins up to speed and then use the tach, I don't understand why you need to test it immediately on startup ? For this kind of rotational speed I think should always ramp the motor up gradually to avoid stalling, burning out the coils or otherwise damaging it.

Also note that you're still (according to the videos) driving an unloaded motor, so the speed will drop as the load increases. Also note that the centrifugal force increases as the square of the (load) radius, so doubling speed will quadruple the force. In other words - stand clear and wear eye protection (better still, a face shield) when testing under load.

@will @clark77494 Is this of any help.

https://forum.arduino.cc/t/nema-23-stepper-motor-speed/653143

There is code there, it looks very straightforward.

Posted by: @zander

@will @clark77494 Is this of any help. 

The new crusher is going to use a NEMA34 not a '23 and he's already had it up to over 4000RPM using a speedTest sketch.

@will I would assume translating from 23 to 34 is not difficult, no?

@will @clark77494 Does this help

https://forum.arduino.cc/t/stepper-motor-basics/275223

@zander 

No it's not unless there's a radical change in drivers. The point is that he's already achieved more than the 1500 RPM speed, albeit unloaded 🙂

@zander Thank you for the code. Just waiting for parts for the NEMA 34 from "Send Cut Send" Will wrote me some speed test code and got it to over 4,000 RPM! Here is the video! 🙂 I tried the piston based can crusher using a NEMA 23 and when I put on the 6" disk the motor didn't have enough torque to get it to go. 

NEMA 23 Motor Test:

NEMA 34 RPM Test: 

@will I found some new stepper code using the AccelStepper.H running into the same issues. The limitation of the software library Stepper.h and AccelStepper.h seems to be 32,767 steps. Here is a simple AccelStepper.h program I found. AccelStepper.h seems to run a little slower then Stepper.h the only advantage is the is a slow down command. 

#include <AccelStepper.h>

AccelStepper stepper; // Defaults to AccelStepper::FULL4WIRE (4 pins) on 2, 3 

void setup()
{  
   stepper.setMaxSpeed(40000);
   stepper.setSpeed(40000);  
}

void loop()
{  
   stepper.runSpeed();
}

@clark77494 

You haven't given it a target position.

Change "stepper.runSpeed();" to "stepper.runToNewPosition(35000);"

@will It's running at less then 1 RPM with the new command. 

@clark77494 

Try setting speed and max speed to 3000 which is inside the allowable range (AccelStepper doesn't support speeds above 4000).

@will Still running at less then 1 RPM. Here is the output signal on the scope.

@will I was thinking the speed test code you gave me would work perfectly. I just need to set the correct frequency and use a loop statement that would turn off the code after just one cycle. When I was using GW Basic I used "For Next Loops" statements all the time. Not sure how to implement it in the code however.