[size=1][font=Verdana, sans-serif]Hi, after I assembled AL5D kit and control the arm in flowbotics everything is working fine. But a couple of hours later I noticed the gripper servo HS-225MG get very hot so I turned it off. When I turn it on again the gripper won’t work which I think I’ve burned it.[/font][/size][font=Tahoma,sans-serif][/font]
[size=1][font=Verdana, sans-serif][/font][/size]
[size=1][font=Verdana, sans-serif]After I replace the gripper with a new HS-225MG servo, I can control the arm normally in the SSC32 Servo Sequencer. However, when I and tried to work in the flowbotics the arm won’t work properly. The arm jolt and sometimes it snap the the power off position. When I tried to move the arm, I also noticed LED B blinked a red light while LED A blinked green.[/font][/size]
[size=1][font=Verdana, sans-serif][/font][/size]
[size=1][font=Verdana, sans-serif]I tired to disconnect the gripper and was be able to control the arm in flowbotics normally. This time only LED A blink a green light and LED B is off. I would like to know is there any solution I can do to control the arm properly in flowbotics with the gripper servo connected? Is the problem is related to the noice produced in input A?[/font][/size]
[size=1][font=Verdana, sans-serif][/font][/size]
[size=1][font=Verdana, sans-serif][/font][/size]
[size=1][font=Verdana, sans-serif][/font][/size]
[size=1][font=Verdana, sans-serif][/font][/size]
[size=1][font=Verdana, sans-serif]Here is the VDO:[/font][/size]
[size=1][font=Verdana, sans-serif][/font][/size]
[size=1][font=Verdana, sans-serif]1.[/font][/size][font=Verdana, sans-serif]AL5D in SSC-32 Servo[/font]
[font=Verdana, sans-serif]youtube.com/watch?v=d8T4XyH38uU[/font]
When you send a command for the gripper to close, it cannot be a position which the gripper cannot reach. For example, if you send a signal for the gripper to close fully, but there is an object between the two teeth, the RC servo is not “smart” enough to stop - it will keep trying to reach the requested “closed” position and heat up very quickly. You therefore need to send a position command where the gripper just touches the object between the teeth.
The second issue might be if the servo was not correctly mounted to the gripper so the rotation mechanism which opens and closes the teeth is reversed.
To confirm, the two first videos show that the arm works, whereas the third one shows that when the gripper servo is connected, that motion is erratic.
1 - Be sure that when you close or open the gripper, it’s not physically impeded. For example if you ask the servo motor which opens and closes the gripper to close even further than it’s able, it will burn.
2 - Check the wires from the gripper servo to the first extension, then to the second extension, and last, to the SSC-32U. Check that the yellow signal wire goes to the yellow wire etc.
3 - Remove the servo from the gripper and see if the same thing happens.
4 - Connect ONLY the gripper servo to the SSC-32U and see if it operates normally.
I’ve centred the gripper servo in SSC-32 Servo Sequencer and the gripper is in a close position (almost touch each other).
All wires are correctly connected yellow to yellow, red to red, and black to black.
When gripper servo is remove, everything works fine in flowbotics, but when I connected the gripper the arm couldn’t function.
When only gripper servo is connected, it operates normally in both SSC-32 Servo Sequencer and Flowbotics. However, I’ve notice that when I close the gripper in Flowbotics the actual AL5D gripper is opening, while I tried to close the gripper it goes in reverse direction. I tried to reassemble the gripper setting the gripper value in flowbotics to be 0, and position the gripper to closing position. Requiring the gripper to open it must rotate in clockwise direction. However, when I control the gripper to open in flowbotics the servo rotate counterclockwise which force the gripper to close even more. How can I assemble this to have the same direction as in flowbotics?
It is my first time playing around with robot. I’m very new to flowbotics and assembling I would like to thank you for your help.
I disassemble the gripper gear from the gripper servo and connected all servo to the board, I still find the same problem which my arm collapse when open in Flowbotics and jolt when I try to control any parts.
The component which connects to the white servo horn is not properly centered which might be causing issues - you will need to remove the two black screws, center the part over the servo horn, and then re-connect.
This gripper is not directly compatible with FlowBotics because the direction of motion is reversed, so as yuo indicated, opening the servo in FBS might actually cause the servo to close.
You indicate that the gripper works correctly on its own, which is odd. Let’s see if it’s the mechanics which are causing an issue - after having centered the horn, can you remove it (center screw) from the servo and have it hang to the side (so when the servo rotates, the gripper is not connected) and try again with all servos? Be certain that all extensions are correct (yellow to yellow, black to black) and connected to the SSC-32 correctly with ground on the outside of the board. ’
Can you have the servo positioned at 1500 (centered) not moving and see if the problem happens with the rest of the arm powered and going through motions?
Theory: The micro servo may not be able to accept the full PWM input range, so you may need to limit the pulses / motion.
