Creating gripper / lifter with one engine

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kenttrike
Posts: 3
Joined: 05 May 2011, 08:18

Creating gripper / lifter with one engine

Post by kenttrike »

Hi everyone!

NXT beginner / short time lurker just turned member here! I love what I've seen so far and am glad to have found this place.

As I'm just starting out with the NXT, I am finding new hurdles and overcoming them several times a day. But one problem that I still haven't been able to find a good solution for is this:

I want to create a device that is able to grab objects in order to then pull, carry or lift them. I've experimented with dozens of builds so far, but I haven't found one that gives me enough flexibility while maintaining a high level of stability. Maybe someone has a few pointers? I'll attach a few photos next to let you know where I stand currently.
kenttrike
Posts: 3
Joined: 05 May 2011, 08:18

Re: Creating gripper / lifter with one engine

Post by kenttrike »

Image
Image
Image

Why won't the pictures show?
Last edited by kenttrike on 05 May 2011, 08:58, edited 1 time in total.
mightor
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Re: Creating gripper / lifter with one engine

Post by mightor »

It doesn't work because you're not using the right URL:

Image

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kenttrike
Posts: 3
Joined: 05 May 2011, 08:18

Re: Creating gripper / lifter with one engine

Post by kenttrike »

Well, they are URLs pointing to the pictures, never knew it could be "righter" than that :)
pavementpilot
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Re: Creating gripper / lifter with one engine

Post by pavementpilot »

The only thing I can think of is the use of clutch gears, to allow the grip, then with the same engine the continued revolutions of the motor for the next movement, be it lift or pull, or what have you.
The definition of insanity is doing a repeated task over and over again, but expecting a different outcome everytime
HaWe
Posts: 2500
Joined: 04 Nov 2014, 19:00

Re: Creating gripper / lifter with one engine

Post by HaWe »

there has been used such a gripper for a submarine model using pneumatics, and a similar one for a RCX robot gripper (IIRC in the set "Exploration Mars" using a Motor with a Newton wheel).
It 1st closes the gripper and then lifts the arm by a lever system (or lowers it and then opens the gripper).
h-g-t
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Location: Albania

Re: Creating gripper / lifter with one engine

Post by h-g-t »

If you google 'lego gripper' you will find quite a few photos of examples. easier than trying to describe them.
A sophistical rhetorician, inebriated with the exuberance of his own verbosity, and gifted with an egotistical imagination that can at all times command an interminable and inconsistent series of arguments to malign an opponent and to glorify himself.
HaWe
Posts: 2500
Joined: 04 Nov 2014, 19:00

Re: Creating gripper / lifter with one engine

Post by HaWe »

h-g-t wrote:If you google 'lego gripper' you will find quite a few photos of examples. easier than trying to describe them.
I did (I don't know if you did) but I could not find fotos of such 1-motor-gripper-arms - but maybe you could show us? ^^
h-g-t
Posts: 552
Joined: 07 Jan 2011, 08:59
Location: Albania

Re: Creating gripper / lifter with one engine

Post by h-g-t »

A sophistical rhetorician, inebriated with the exuberance of his own verbosity, and gifted with an egotistical imagination that can at all times command an interminable and inconsistent series of arguments to malign an opponent and to glorify himself.
HaWe
Posts: 2500
Joined: 04 Nov 2014, 19:00

Re: Creating gripper / lifter with one engine

Post by HaWe »

that's in fact a good one. Couldn't find that googling 'lego gripper'.
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