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 17:42:29 GMT
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Viewed:
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4739 times
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Ray Sanders wrote:
> 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!
Thanks Joseph.
> >
> > 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..
I dont think i will have problems with the natural COG of this beast.
>
> 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
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 any gear i have tried, is that the gears do not "center" on the wheel.
Meaning, the width spacing of the hailfire wheel, is (a guess) 1mm off
regular lego sizes. I used a trick from Iain to reduce the left/right
slop by adding a "spacer" made from this old gear.
http://www.bricklink.com/catalogItemPic.asp?P=4143
Chris
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Message is in Reply To:
 | | Re: Hailfire attachment points
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| (...) 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 (...) (22 years ago, 13-Mar-05, to lugnet.org.ca.rtltoronto)
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