|
|
 Posted 2/21/2005 10:51:14 AM |
|
|
Forum Member
 
Last Login: 5/10/2004 1:37:20 AM
Posts: 150,
Visits: 0
|
|
| Calling Dave in hopes he might finally settle all the questions on this thread.
|
|
|
|
| Posted 2/21/2005 4:16:45 PM |
|
|
Junior Member
Last Login: 5/10/2004 1:35:40 AM
Posts: 81,
Visits: 0
|
|
No idea! 
The wheel hubs were off the cars in the archives and I STILL had no idea how they worked. One thing for sure, it has nothing to do with gravity...otherwise they would spin like mad when the car stopped! The TFX guy told me they used counter-rotating bearings...I'm just a messenger for this one. I'll let you guys discuss and send off some pics to Jack!
|
|
|
|
| Posted 2/21/2005 7:37:19 PM |
|
|
Junior Member
Last Login: 5/10/2004 1:36:36 AM
Posts: 77,
Visits: 0
|
|
Dave, lets see those pictures. Jack 
|
|
|
|
| Posted 2/21/2005 11:25:26 PM |
|
|
Supreme Being
Last Login: 5/10/2004 1:37:34 AM
Posts: 1,034,
Visits: 0
|
|
I still belive that they hubs were simply counterweighted spinners. These won't spin when you stop because they weren't spinning when you were moving. There is no momentum to make them spin. (that's what regular spinners do, I belive they call these floaters now)They will move some and can swing forward (but not all the way around) on a hard stop. This can be corrected with a magnet system like the one Chrystler has patented. Even regular spinners will stay stationary for a second or two but eventually there is enough friction to start them spinning and enough momentum to keep them spinning when you stop.
Tim
|
|
|
|
| Posted 2/22/2005 7:49:19 AM |
|
|
Junior Member
Last Login: 5/10/2004 1:37:09 AM
Posts: 27,
Visits: 0
|
|
| Okay Jack, time to share and play nice!
|
|
|
|
| Posted 2/23/2005 7:52:54 AM |
|
|
Junior Member
Last Login: 5/10/2004 1:37:43 AM
Posts: 46,
Visits: 0
|
|
Seems like a lot of geeky engineers hang out at this site...
First of all, the weighted spinner theory: regardless of the weight inertia would cause them to rotate on acceleration or braking. I'm not really familiar with the Forever movie but it appears they use a mechanical system (supported by the previous discussion).
You essentially have three planes of movement here: the stationary ring gear attached to the axle housing or steering knuckle (much like your car's brake calipers), the pinion shaft that passes through the car's wheel (supported by sleeve bearings), and the ring gear attached to the 'spinning' wheel hub assembly.
The wheel rotates on the axle, the pinion gears rotate around the inboard ring gear on a shaft that passes through the wheel and held in place by sleeve bearings. The 'rotating' hub (Bat symbol) is attached to a freewheeling hub spindle. The outboard ring gear is rigidly attached to this rotating hub.
If you removed the pinion gears and shaft the Bat symbol would spin freely. However, with the pinion gears in place the inboard and outboard ring gears are 'locked' together and not free to rotate independent of each other yet the wheel and tire can still spin on the axle.
Hope this helps.
P.S. If any of my terminology is incorrect, I apologize. I'm a structural guy not a mechanical guy.
|
|
|
|
| Posted 2/23/2005 8:56:05 AM |
|
|
Supreme Being
Last Login: 5/10/2004 1:37:34 AM
Posts: 1,034,
Visits: 0
|
|
That's exactly what I meant...
Wow, that's really cool. nice renderings there too. It would be cool to play around with the gear ratios to make it spin backwards or slowly forwards. Okay, now where is my box of ring gears??? "Honey, I'll be outside by the mini-van!" 
|
|
|
|
| Posted 2/23/2005 9:38:36 AM |
|
|
Forum Newbie
Last Login: 5/10/2004 1:37:11 AM
Posts: 8,
Visits: 0
|
|
| Tell me again what holds the wheel on?
|
|
|
|
| Posted 2/23/2005 9:46:35 AM |
|
|
Junior Member
Last Login: 5/10/2004 1:37:43 AM
Posts: 46,
Visits: 0
|
|
The wheel is held to the axle by the lug nuts as in your typical automobile. The rotating spindle that holds the symbol hub cap could have a flange and be drilled to the same pattern as the lug nuts.
At least that's how I'd design it.
|
|
|
|
| Posted 2/27/2005 3:09:43 AM |
|
|
Junior Member
Last Login: 5/10/2004 1:35:40 AM
Posts: 81,
Visits: 0
|
|
VMan, that CAD drawing looks exactly like what was explained to me. It's one of those things that is difficult as hell to explain and even draw but I'm sure once you see it..."Smack" on the forehead. The other thing is that not only does the bat logo remain perfectly straight but it of course needed neon lighting and wiring coming through the rim and up to the front! More head scratching...
|
|