Subject:
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Re: SSClagorpion
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Newsgroups:
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lugnet.technic
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Date:
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Fri, 16 Apr 2004 13:13:07 GMT
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Viewed:
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8464 times
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In lugnet.technic, Mark Bellis wrote:
> A few things spring to mind about this:
>
> 3. The model is going to walk, so the force on each leg is potentially a dynamic
> one, if it walks fast enough. When you jump repeatedly, the force on your legs
> is not equal to your weight, but significantly more - at least double,
That makes sense, but you may want to take a look at the video of Kevin's
walkers:
http://www.kclague.net/Quad242/q242-forward.mpg
As you see, at the end of each stride, all four legs are at the bottom of their
travel. So while it is true that half the legs will have to support all the
weight, I don't think the force on the legs will ever be above the weight of the
walker.
It's pretty cool the way it walks. I'm not exactly sure what it's doing, it
must be some kind of black magic...
> I suggest you make a trial compressor engine using a pair of 8475 RC buggy
> motors geared down and four pump cylinders with springs removed, with cranks
> offset at each 90 degree angle. Offsetting the pumps by 90 degrees should make
> the load on the motors smoother. The engine will need to be very strong due to
> the torque required. I suggest two shafts geared together, supported by double
> width beams throughout. Use 40 tooth cogs to make the cranks as they're more
> sturdy than other crank parts and will allow you to gear the two shafts together
> easily.
Yes, Kevin was just talking about using beams for strength throughout the model,
instead of the lighter liftarms he often uses.
I'm hoping he has some experience with compressors. If not, I'll have to throw
together something using the buggy motors. Thanks for the idea.
Steve
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Message has 1 Reply:
 | | Re: SSClagorpion
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| (...) Funny! My presentation at Brickest (classic?) was named Pneumatic Magic. When I started on quad242 I thought the cool thing was going to be the ability to make it modify its behavior to go backwards and turn, but the hardest part was the "no (...) (20 years ago, 16-Apr-04, to lugnet.technic)
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Message is in Reply To:
| | Re: SSClagorpion
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| (...) A few things spring to mind about this: 1. I usually run robots from a car tyre air compressor at 25PSI. This gives good performance with 1-2 large cylinders moving at a time. Using 6 large pump cylinders as the air source, performance is half (...) (20 years ago, 15-Apr-04, to lugnet.technic)
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