Author Topic: How do the grippers in this robotic gripper open and close?  (Read 2666 times)

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Offline airman00

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Re: How do the grippers in this robotic gripper open and close?
« Reply #1 on: November 25, 2008, 06:21:21 PM »
its missing a part
theres a motor with a gear thats in between the two gears that turns them
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Offline szhang

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Re: How do the grippers in this robotic gripper open and close?
« Reply #2 on: November 25, 2008, 06:42:46 PM »
I don't think it is missing a gear.

One of the two gears has to be actuated though (there needs to be a motor turning one of the big gears), in google sketchyphysics you can drag on the gear and turn it.
« Last Edit: November 25, 2008, 06:43:38 PM by szhang »

Offline airman00

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Re: How do the grippers in this robotic gripper open and close?
« Reply #3 on: November 25, 2008, 07:40:44 PM »
I don't think it is missing a gear.

One of the two gears has to be actuated though (there needs to be a motor turning one of the big gears), in google sketchyphysics you can drag on the gear and turn it.

well yea you can do that also , or add another gear to it , both would yield the same result  - as long as each fingers gripper is turning in the opposite direction you are fine.
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Offline AdvsNoob

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Re: How do the grippers in this robotic gripper open and close?
« Reply #4 on: November 26, 2008, 11:00:20 PM »
I be leave you need a servo ^_^ never really made gripper, you might need two but there really not alot of money

Offline MaltiKTopic starter

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Re: How do the grippers in this robotic gripper open and close?
« Reply #5 on: November 27, 2008, 05:35:42 AM »
I don't think it is missing a gear.

One of the two gears has to be actuated though (there needs to be a motor turning one of the big gears), in google sketchyphysics you can drag on the gear and turn it.

well yea you can do that also , or add another gear to it , both would yield the same result  - as long as each fingers gripper is turning in the opposite direction you are fine.

Do I need PWM motors to do the trick? I ask this because it seems I can just use a transistor to switch the direction of the motor if no Motor Chip is used. If I just used a regular DC motor underneath the gripper mechanism, connected to one gear? What I am asking is, is there an alternative to using a servo instead of using a motor with a motor driver chip?
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Offline Ro-Bot-X

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Re: How do the grippers in this robotic gripper open and close?
« Reply #6 on: November 27, 2008, 06:51:31 AM »
The purpose of using a servo is that the servo can go to many positions while a DC motor (with driver) will go from full open to full close. However, if you attach a geared DC motor on one wheel and attach a potentiometer to the other wheel (and plug it in an analog pin of your microcontroller), you can move the motor until the pot reaches a certain position then put the motor on brakes (send same signal on both direction lines, like shorting the motor leads) to hold that position. This way you will simulate a servo.
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