Subject:
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Re: Hailfire attachment points
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Newsgroups:
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lugnet.org.ca.rtltoronto
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Date:
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Sun, 13 Mar 2005 17:15:46 GMT
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Viewed:
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724 times
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In lugnet.org.ca.rtltoronto, Joseph Greene wrote:
> In lugnet.org.ca.rtltoronto, Chris Magno wrote:
> >
> > > (i THINK these are the deep links, if they dont work... tough)
> > >
> > >
> > > http://www.brickshelf.com/cgi-bin/gallery.cgi?i=1143662
> > > http://www.brickshelf.com/cgi-bin/gallery.cgi?i=1143663
> > > http://www.brickshelf.com/cgi-bin/gallery.cgi?i=1143665
> >
> >
> > i think i learned about deep links... you have to click the image AFTER
> > you click the image....
> >
> > (geesh)
> >
> > http://www.brickshelf.com/gallery/magno/Hailfire/100_2923.jpg
> > http://www.brickshelf.com/gallery/magno/Hailfire/100_2925.jpg
> > http://www.brickshelf.com/gallery/magno/Hailfire/100_2926.jpg
> Looks like a great start to me!
>
> as to CoG and Wheel Center, if the Center of Gravity is above the centerline of
> the then balancing becomes a monumental task. If the Center of Gravity IS the
> centerline of the wheels rotation (or even really close in to it) , severe
> gerbilling tends to occur. If the CoG is well below the centerline of rotation
> thenthe construction is more balanced staticly and therefore more able to
> deliver the majority of the engines force to rotating the wheel and therfore
> moving the entire device. If the CoG is well over the centerline, you end up
> having to make constant corrections and adjustments to maintain the front-to
> -back balance as gravity attempts to knock the CoG down..
When I looked at the first image, one item caught my eye immediately was the
8-tooth gear. When I built my expirement, I had intended the hailfire wheel to
be run in an upright position. The first thing I tried was the 8-tooth gear. I
found the inside of the hailfire wheel (itself an inverted gear) had quite a bit
of (not sure what to call it) gear interference (?) with the teeth of the
8-tooth gear. IOW, when one tooth of the 8-tooth is purely interfaced, the next
tooth to come into play is binding (ever so slightly) because of the inverted
nature of the hailfire wheel. One way of describing it is the ratio of the two
gears (one negative teeth and one positive teeth) is too far off from one
another for smooth operation. When I tried this I held my version upright and
tried to spin it. It was obvious that there was much binding and friction. So I
reengineered the center system to use 40-tooth gears (less available and more
expensive) and found that the gear friction dropped way off (and it was
noticebly quieter in operation). I used 4x 40-tooth gears. I think it might be
set up to use 3, but I doubt that 2 would work. This may or may not be an issue
for you, but it made a huge difference for the item I was trying to build.
Ray
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Message has 1 Reply:
 | | Re: Hailfire attachment points
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| (...) Thanks Joseph. (...) I dont think i will have problems with the natural COG of this beast. (...) Ray Thanks, I had no problem with this set up. Have a look at the second photo, you can see that the 8t mesh very nice. The only issue I had with (...) (20 years ago, 13-Mar-05, to lugnet.org.ca.rtltoronto)
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Message is in Reply To:
| | Re: Hailfire attachment points
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| (...) as to CoG and Wheel Center, if the Center of Gravity is above the centerline of the then balancing becomes a monumental task. If the Center of Gravity IS the centerline of the wheels rotation (or even really close in to it) , severe gerbilling (...) (20 years ago, 13-Mar-05, to lugnet.org.ca.rtltoronto)
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