Subject:
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Re: Compact dozer design
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Newsgroups:
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lugnet.technic
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Date:
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Thu, 14 Apr 2005 15:34:33 GMT
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Viewed:
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3707 times
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In lugnet.technic, orion@orionrobots.co.uk wrote:
>
> I built one of these myself - a while ago. The LDraw plans are at
> http://orionrobots.co.uk/tiki-download_file.php?fileId=4 although I am
> yet to take some photos. My version could definately be made smaller.
> I intend to apply the principle to two modified servos in a non-Lego
> bot, although I will probably still use the Lego gears.
>
> Danny
> --
> http://orionrobots.co.uk - Build Robots
>
> On 4/14/05, Ross Crawford <rosscraw@bigpond.net.au> wrote:
> > In lugnet.technic, Nathan Bell wrote:
> > > In lugnet.technic, Danny Staple wrote:
> > > > I dunno - but I really like the compact adder-subtractor drive. I have
> > > > been messing with those a lot - and that is very small.
> > > > --
> > > > http://orionrobots.co.uk - Build Robots
> > > >
> > > > On Apr 12, 2005 5:06 PM, Nathan Bell <Radarbell@hotmail.com> wrote:
> > > > > This is an amazingly small and detailed design. The only question is- why
> > > > > did
> > > > > they not use 2 pistons to turn the blade?
> > > > >
> > > > > http://brickshelf.com/cgi-bin/gallery.cgi?f=125056
> > >
> > > I can't figure out how that adder- subtracter device works. Are they using
> > > two
> > > motors or one? Do the differentials do all the work?
> >
> > There appear to be 2 motors. Looking at this pic
> > http://brickshelf.com/cgi-bin/gallery.cgi?i=1181220 it appears the top motor
> > drives one or other of the 8 tooth gears on the right (probably
> > forward/reverse), and the bottom one drives the 8 tooth gear on the left
> > (probably steering). The adder/subtractor is very similar to this one I did a
> > while ago: http://www.lugnet.com/~469/projects/addsub
> >
> > ROSCO
What exactly is the advantage of using the adder-subtracter design versus the
motor-for-each-track design?
Let me guess; does the adder-subtractor design produce slow changes in direction
while the motor-for-each-track design only makes quick changes in direction?
(does this design allow the dozer to make smoother turns rather than abrupt
turns?)
Nathan
> >
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Message has 1 Reply:
 | | Re: Compact dozer design
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| (...) Nope - it means if you have two motors which are not perfectly matched (which they so very rarely are), you can still get a straight line. If you build a motor-per-track buggy, and drive it accross a long corridor, then without course (...) (20 years ago, 14-Apr-05, to lugnet.technic)
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Message is in Reply To:
| | Re: Compact dozer design
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| I built one of these myself - a while ago. The LDraw plans are at (URL) although I am yet to take some photos. My version could definately be made smaller. I intend to apply the principle to two modified servos in a non-Lego bot, although I will (...) (20 years ago, 14-Apr-05, to lugnet.technic)
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