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In lugnet.technic, Philippe Hurbain wrote:
> Very impressive! I don't know what is the most amazing: the odometer
> itself or the extensive write-up ;o)
Thanks! Both were fun ;)
> Would you have more details (MLCad?) of the gearing/ratcheting between dials?
I don't yet, though I can easily do that. The 4-spoked technic joiners, when
turned, rotate the 16T gear at the opposite end of the dial. That gear then
connects to two idler gears which drive a 40T gear; that 40T gear then connects
through the framework to the next dial.
The ratchet mechanism is simply a rack gear on a loose technic pin that
interfaces with the 40T gear to ensure that it only rotates in one direction.
I'll see what I can do about modeling it.
> And BTW, did you see this:
I had not seen that. It's ... it's ... it's gorgeous! I'm stunned. I've been
staring at it all morning, dissecting it, and ithcing to get home and build a
version. I think this would work better than my cog-and-pin method, and I'm
dying to try and implement this right away. I love the aesthetics of its
functioning.
Thanks for the link! I expected a longer downtime before Rev. 2.0, but I don't
think I can wait.
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> I'll see what I can do about modeling it.
It would certainly help my slow mind ;o) Though I think I got it through your
explainations.
>
> > And BTW, did you see this:
>
> I had not seen that. It's ... it's ... it's gorgeous! I'm stunned. I've been
> staring at it all morning, dissecting it, and ithcing to get home and build a
> version. I think this would work better than my cog-and-pin method, and I'm
> dying to try and implement this right away. I love the aesthetics of its
> functioning.
Very elegant and parts savvy, but I am not sure it would provide a design as
compact as yours.
>
> Thanks for the link! I expected a longer downtime before Rev. 2.0, but I don't
> think I can wait.
Sorry to disturb you ;o)
Philo
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In lugnet.technic, Shaun Sullivan wrote:
> In lugnet.technic, Philippe Hurbain wrote:
> > And BTW, did you see this:
>
> I had not seen that. It's ... it's ... it's gorgeous! I'm stunned. I've been
> staring at it all morning, dissecting it, and ithcing to get home and build a
> version. I think this would work better than my cog-and-pin method, and I'm
> dying to try and implement this right away. I love the aesthetics of its
> functioning.
>
> Thanks for the link! I expected a longer downtime before Rev. 2.0, but I don't
> think I can wait.
I'd love to see what you come up with! however I fear Philo may be right about
it being too large.
Your mechanism is shorter at 3 studs (2 cogs and a support) my chain precession
drive is 4 studs long. Also the precession mechanism needs 9 studs clearance to
turn vertically (8.5 to be exact) and 8 studs horizontally, and this may make it
too big for a train!
The precession mechanism turns in both directions, but it does favour one
direction, this is due to the chain tread link being offset (not in the middle
between the chain pivot pins) It does need to be aligned well to run smoothly,
which makes me think your cog method is more robust. Chain alignment can be
tricky also there are 44 chain link bars and forty teeth, meaning that one or
two links out, and it will not give enough tick over turn at the right point.
even running the chain the other way makes a difference (because of the offset)
I like your number drums better than mine! and agree that a tick makes for a far
better counter! as for readability you could screen off the dials leaving only a
slot to read from, and yes colours for complete and partial miles.
If you were to use the precession mechanism you could place your number stickers
directly on the track links, making smaller dials, and making screening them
easier.
Its a nice project!
Regards
Mike.
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In lugnet.technic, Shaun Sullivan wrote:
> In lugnet.technic, Philippe Hurbain wrote:
> > Very impressive! I don't know what is the most amazing: the odometer
> > itself or the extensive write-up ;o)
>
> Thanks! Both were fun ;)
>
>
> > Would you have more details (MLCad?) of the gearing/ratcheting between dials?
>
> I don't yet, though I can easily do that. The 4-spoked technic joiners, when
> turned, rotate the 16T gear at the opposite end of the dial. That gear then
> connects to two idler gears which drive a 40T gear; that 40T gear then connects
> through the framework to the next dial.
>
> The ratchet mechanism is simply a rack gear on a loose technic pin that
> interfaces with the 40T gear to ensure that it only rotates in one direction.
>
> I'll see what I can do about modeling it.
Even with that explaination, I just can't seem to get the spacing and the
gearing right between the dials. If you have the time, please, I would like a
visual aid of the between walls and the between-dials gearing. When I first saw
this, I thought "wow, sooo cool! I have to build one for my modest layout!".
Several months of tinkering with LDraw and real pieces, and I'm still stuck
after the first dial setup.
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