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 21:09:48 GMT
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Viewed:
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3743 times
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In lugnet.technic, orion@orionrobots.co.uk wrote:
>
> On 4/14/05, Nathan Bell <Radarbell@hotmail.com> wrote:
> > 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
> >
> > 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
> >
> > > >
> 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 correction, it is likely to veer slowly
> off course. If you take a look at
> http://orionrobots.co.uk/tiki-index.php?page=Adder%20Subtractor%20Drive
> and http://www.lugnet.com/~469/projects/addsub they go into a bit more
> depth on it.You can still make just as abrupt turns with it - although
> they may be slightly easier to control with the add-sub drive.
>
> Danny
> --
> http://orionrobots.co.uk - Build Robots
That does sound like an advantage. However if I'm not mistaken, it also means
less torque because technically only one motor is driving the wheels. The other
one is just for steering.
??
Nathan
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Message has 1 Reply:
 | | Re: Compact dozer design
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| (...) Well sort of. The application of torque is reversed - when steering a "1 motor per track" model, you only get 1 motor driving, when going straight you get 2. This is simply reversed in the adder/subtractor system. It's a small price to pay for (...) (20 years ago, 15-Apr-05, to lugnet.technic)
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Message is in Reply To:
| | 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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