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Thanks for the response. I've decided to stay away from string on the robot
as string can get easily entangled, especially if battling another robot.
I took a break from trying a design using gears and differentials - I was
getting really frusterated. I tried an idea I first dismissed - using
pneumatics, I had thought pneumatics would be too slow. My first few tests
are working really well so I'll keep working with them in making a
mechanical hammer.
Roy
In lugnet.technic, Paul Kleniewski writes:
> winding and unwinding string seems to be to slow if i understand it good
> so my idea is here:
> use two wheels (pulleys) especiali as big as you can put into your design
> they should be with flat surface so it meand they should be from old sets
> like: http://www.peeron.com/inv/parts/4266
> or bigger: http://www.peeron.com/inv/parts/3739
> ( http://www.ozbricks.net/clark/WheelHelper.html )
>
> they shold be mounted in this way
> one bottom wheel stable to the tank body
> and the other one (upper) should have possibility to change distant to
> bottom wheel
> the distance could be changed in the same way as hammer (releasing spring or
> rubber belt)
> using http://peeron.com/inv/parts/6539 driven (moved not rotated) by let say
> micromotor
> (i thing this way of releasing you developed before me)
>
> between pulleys passes the rubber strip which could be pulled by rotating
> pulleys
> so hammer can be puul over
> when the strength is quite good you can release upper pulley
>
> in this design ther is no unroll effect of string!
>
> picture is here
> http://republika.pl/pixsrv/lego/images/HammerRelease.jpg
>
> regards
> pixel
>
>
> "Roy Nelson" <rtnelson@telusplanet.net> wrote in message
> news:H71G1w.2LE@lugnet.com...
> > I need help in designing a motor-driven hammer for my RCX Tank Base Two.
> > The hammer should be forced down to create a greater impact than that as • if
> > it were simply dropped. The hammer should have a length of about 28 studs
> > from its point of rotation to its head. Ideally the hammer should have a
> > range of motion of about 30 degrees to 180 degrees (at 30 degress the • hammer
> > nicely stores on the robot base, at 180 degrees the hammer has been fully
> > released). The working mechanism should fit in an area of 8 by 14 studes • or
> > 6 by 24 studs (this depends on the position of the RCX). Minimal height • is
> > desired, 5 to 6 bricks is expected.
> >
> > In lugnet.technic, Steve Hassenplug writes:
> > > What problems are you having?
> > >
> > > In lugnet.technic, Roy Nelson writes:
> > > > Hello All,
> > > >
> > > > I'm looking for some mechanical design help.
> > > >
> > > > I am attempting to build a hammer device for my RCX Tank Base Two, kind • of a
> > > > 'Robot Warriors' thing. I'm looking for ideas on how to do this, so far • I
> > > > have failed at my own attemps.
> > > > If you have any ideas how to solve this problem please let me know.
> > > >
> > > > Roy Nelson
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Message is in Reply To:
 | | Re: Hammer Help
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| winding and unwinding string seems to be to slow if i understand it good so my idea is here: use two wheels (pulleys) especiali as big as you can put into your design they should be with flat surface so it meand they should be from old sets like: (...) (24 years ago, 13-Dec-02, to lugnet.technic, lugnet.robotics)
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