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Gripper stopped working


(alessandro spadaro) #1

Hi, I write from Italy, last month (June 3) I bought your newton subsea gripper, after mounting it as per your instructions I tested the rov, first on the surface and then underwater, but after a few times it stopped work. I checked the internet there is no trace of water, so I think the gripper’s engine has had problems. How can I verify the problem, and also has a guarantee since the gripper is only one month old and has worked very few times? thank you


New Product: The Newton Subsea Gripper!
(Jacob) #2

Hi @Alex-sanders, please contact support@bluerobotics.com for help troubleshooting and getting a replacement.


(alessandro spadaro) #3

I am writing from Italy, last month I bought your Newton Gripper (Intec- Spadro Alessandro -Italy) and after having assembled it and correctly configured it as per your instructions, I first tested it on the surface and then under water without problems. But after only the second test the Manipulator was blocked during the closing phase and it is no longer open. I disassembled it and verified that it’s all right and there are no traces of water or humidity and so I know what happened. How can I solve? is it by chance a block that you can intervene via software? in case it is damaged, does the Manipulator have a guarantee since it has only been used twice? thank you


(Nikos Maurommatis) #4

Hi,

I have the same situation, two-three days ago I setup the gripper and everything was working fine but today I had a check for tomorrow dive and the gripper is dead. Is any known issue about the gripper? What I have to check? (I am running the last version of Ardusub (see older topic when I was trying to setup the gripper).

nmau


(Daniel Heideman) #5

Hi @nmau,

We do not currently know of any widespread issues with the gripper.

Does your gripper make any sound when you try to open or close it? Is it stuck fully open or fully closed?


(Nikos Maurommatis) #6

@dheideman,

I have no noise. It is dead at all. I had the same behavior before upgrade Ardusub. May you suggest what to check. I am thinking to test the gripper using an Arduino system that I have on my desk, is that possible?

nmau


(Daniel Heideman) #7

Yes, it is possible to test the gripper with an Arduino. I’ve included a sample sketch that will try to open and close the gripper repeatedly.

Attach the gripper’s yellow wire to Arduino pin 10 (or whatever you change GRIPPER_PWM_PIN to) and apply power as usual to the red and black wires. You will need to connect the gripper’s ground (black) wire to one of the Arduino’s GND pins to get a consistent signal. Below is an illustration of the setup; replace the servo with the gripper and the power supply with any 9~18 volt power supply.

Gripper Test Sketch:

#include "Servo.h"

#define GRIPPER_PWM_PIN   10    // Gripper PWM output pin
#define OPEN_TIME         5.0   // Gripper open time (seconds)
#define CLOSE_TIME        5.0   // Gripper close time (seconds)

#define OPEN_PWM_US       1100  // Gripper open PWM output (us)
#define CLOSE_PWM_US      1900  // Gripper close PWM output (us)

Servo gripper;

void setup() {
  // Attach gripper to proper pin
  gripper.attach(GRIPPER_PWM_PIN);

}

void loop() {
  // Open the gripper
  gripper.writeMicroseconds(OPEN_PWM_US);

  // Let the gripper open up (microseconds)
  delay(OPEN_TIME*1000);

  // Close the gripper
  gripper.writeMicroseconds(CLOSE_PWM_US);

  // Let the gripper close for a while (microseconds)
  delay(CLOSE_TIME*1000);
}

(Nikos Maurommatis) #8

@dheideman,

I have tried your code in an arduino uno and the gripper worked fine. I plug the gripper to BR2 and it worked fine!!! The only thing I can think is the yellow cable (signal wire) wasn’t firm enough. I will let you know if the problem come back (I hope not).

Thank you again,
nmau