Subject:
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RE: Gripper and lift arm with single motor
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Newsgroups:
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lugnet.robotics
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Date:
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Mon, 9 Aug 1999 19:49:02 GMT
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Viewed:
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676 times
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Thanks but:
No more diffs left I had to use two in the adder subtractor for the drive!
I've a load of old style diffs but they are real awkward to use and hard to
fit into a model except at the place where the were original designed to
fit (between driven wheels on vehicles with rack a pinnon steering)
maybe I should get a few more of new type
David Walton
Email: d.walton@ndirect.co.uk
Take a look at my homepage (still under construction though)
http://www.walton.ndirect.co.uk/
Now on ICQ: 44277445
"If it ain't broke don't fix it !!"
-----Original Message-----
From: Brian B. Alano [SMTP:alano@kiva.net]
Sent: Monday, August 09, 1999 6:33 PM
To: David Walton
Subject: Re: Gripper and lift arm with single motor
Using a differential is probably the way you want to go. I've done a scoop
and
lift this way (front loader style. Using the old technic motor, I could
scoop,
grasp and lift a Lego horse. I could have done more with better gearing.
The
Lego with the camera featured in the RCX commercials employs a similar
technique with the differential.
David Walton wrote:
> I hope someone can help me with this
>
> I tried most of the weekend to try and build a mechanism to grab an item
> (49.6x28 VR wheel) and lift it using one new type motor (the ones in the
> RIS). All my attempts seem to either self destruct or just didn't work.
>
> Basically my designs were based upon fixing an axle at the lift pivot • point
> and using a pair of bevel gears to produce rotation to drive a gripper.
>
> What I would like to be able to do is drive the jaw once it is closed the
> lift mechanism would engage. I just couldn't get it right and its getting
> me a bit frustrated.
>
> NO I can't just use another motor and some touch sensors, I need the • motors
> for drive adder/subtractor based tracked vehicle and the sensor inputs • for
> navigation and object detection
>
> Anybody give me any pointers to designs on the web which actually work - • I
> know Ben Willamson had a design but that doesn't give enough movement of
> the gripper jaws for my project
>
> TIA
>
> David Walton
>
> Email: d.walton@ndirect.co.uk
>
> Take a look at my homepage (still under construction though)
> http://www.walton.ndirect.co.uk/
>
> Now on ICQ: 44277445
>
> "If it ain't broke don't fix it !!"
> --
> Did you check the web site first?: http://www.crynwr.com/lego-robotics
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