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I made a three speed, fully mechanical, automatic transmission a few weeks
ago, and put a description of it on a web page. It uses a locking
differential to select the gears, and I've not seen that done in lego
before. If you are interested, the URL is:
http://ichabod.last-outpost.com/~malakai/lego/index.html
Thanks!
-jsj
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In lugnet.technic, Jeff Jahr writes:
> I made a three speed, fully mechanical, automatic transmission a few weeks
> ago, and put a description of it on a web page. It uses a locking
> differential to select the gears, and I've not seen that done in lego
> before. If you are interested, the URL is:
>
> http://ichabod.last-outpost.com/~malakai/lego/index.html
>
> Thanks!
Couldn't have put it better myself! Except perhaps many thanks! That's really
neat, Jeff! I think I've worked out how it all goes together - I'm gonna have
to try it out on the weekend!
And I'd be interested in details of your 9-speed gearbox as well!
ROSCO
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Awesome! Thanks for building one of these. Have you put together any
instructions or a .dat file? I'd like to use this in a 4x4 I'm building.
Thanks again.
-Nathan
In lugnet.technic, Jeff Jahr writes:
> I made a three speed, fully mechanical, automatic transmission a few weeks
> ago, and put a description of it on a web page. It uses a locking
> differential to select the gears, and I've not seen that done in lego
> before. If you are interested, the URL is:
>
> http://ichabod.last-outpost.com/~malakai/lego/index.html
>
> Thanks!
>
> -jsj
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"Jeff Jahr" <malakais@pacbell.net> wrote:
> I made a three speed, fully mechanical, automatic transmission a few weeks
> ago, and put a description of it on a web page. It uses a locking
> differential to select the gears, and I've not seen that done in lego
> before. If you are interested, the URL is:
>
> http://ichabod.last-outpost.com/~malakai/lego/index.html
>
> Thanks!
Wow!
Very clever. From what I know this is the first purely mechanical automatic
gear shift. It's really impressive.
Ciao
Mario
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That's wonderful, but I am still not sure how it does work, although my
major was mechanical Engineering:)
Do you have any .dat file?
Zhengrong
In lugnet.technic, Mario Ferrari writes:
> "Jeff Jahr" <malakais@pacbell.net> wrote:
> > I made a three speed, fully mechanical, automatic transmission a few weeks
> > ago, and put a description of it on a web page. It uses a locking
> > differential to select the gears, and I've not seen that done in lego
> > before. If you are interested, the URL is:
> >
> > http://ichabod.last-outpost.com/~malakai/lego/index.html
> >
> > Thanks!
>
> Wow!
> Very clever. From what I know this is the first purely mechanical automatic
> gear shift. It's really impressive.
>
> Ciao
> Mario
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Very Impressive!
I have just been learning about real automatic transmissions in school, and
they are based on planetary gear sets. Depending on which ring gear is locked,
you get different ratios. I never would have thought of using differentials for
this function... but they are actually planetary gear trains :) Thanks for the
info, you have really inspired me!
Rob
(btw, I also noticed the link to my humble CVT design... Thanks :)
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In lugnet.technic, Rob Stehlik writes:
> Very Impressive!
> I have just been learning about real automatic transmissions in school, and
> they are based on planetary gear sets. Depending on which ring gear is • locked,
> you get different ratios. I never would have thought of using differentials • for
> this function... but they are actually planetary gear trains :) Thanks for • the
> info, you have really inspired me!
> Rob
> (btw, I also noticed the link to my humble CVT design... Thanks :)
Hey, I built a knockoff of your CVT that did use the two dishes to increase
the friction. It kind of helped, but it was still really lossy. I've got
to say, that is a way cool design though! I knew it would have a wide ratio,
but was still impressed when I saw it spin.
-jsj
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In lugnet.technic, Jeff Jahr writes:
> I made a three speed, fully mechanical, automatic transmission a few weeks
> ago, and put a description of it on a web page. It uses a locking
> differential to select the gears, and I've not seen that done in lego
> before. If you are interested, the URL is:
>
> http://ichabod.last-outpost.com/~malakai/lego/index.html
I've updated the page with some answers to the questions that I've been
asked, including the 'Is there an ldraw file somewhere' one. The answer to
that question is, yes, there is now. See the page for details.
Thanks, everyone, for your responses!
-jsj
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I downloaded your .dat, Jeff and built one last night. Very cool. One thing for
anyone else building it from the .dat - the gears that engage the shifter arm
aren't shown in the .dat, but you can see them clearly in the photos on Jeff's
page.
I put some wide wheels on mine, and tried it on the living room carpet (lots of
friction). It shifted into low gear and took right off!
In lugnet.technic, Jeff Jahr writes:
> In lugnet.technic, Jeff Jahr writes:
> > I made a three speed, fully mechanical, automatic transmission a few weeks
> > ago, and put a description of it on a web page. It uses a locking
> > differential to select the gears, and I've not seen that done in lego
> > before. If you are interested, the URL is:
> >
> > http://ichabod.last-outpost.com/~malakai/lego/index.html
>
> I've updated the page with some answers to the questions that I've been
> asked, including the 'Is there an ldraw file somewhere' one. The answer to
> that question is, yes, there is now. See the page for details.
>
> Thanks, everyone, for your responses!
>
> -jsj
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In lugnet.technic, Don Rogerson writes:
> I downloaded your .dat, Jeff and built one last night. Very cool. One thing • for
> anyone else building it from the .dat - the gears that engage the shifter arm
> aren't shown in the .dat, but you can see them clearly in the photos on • Jeff's
> page.
I missed a set of gears in the .dat? Rats. I'll try to get that fixed.
> I put some wide wheels on mine, and tried it on the living room carpet (lots • of
> friction). It shifted into low gear and took right off!
Excellent! Send me a jpg, I'll put it on the page. ;')
-jsj
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> I missed a set of gears in the .dat? Rats. I'll try to get that fixed.
Ok, I added the missing gear axle into the dat. Thanks for pointing it out!
-jsj
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Amazing work,
Im still trying to figure out exactly how it works.
Can you add another top view picture from the other side of the car?
(to see the gear train along the far side)
Thanks,
David
In lugnet.technic, Jeff Jahr writes:
> I made a three speed, fully mechanical, automatic transmission a few weeks
> ago, and put a description of it on a web page. It uses a locking
> differential to select the gears, and I've not seen that done in lego
> before. If you are interested, the URL is:
>
> http://ichabod.last-outpost.com/~malakai/lego/index.html
>
> Thanks!
>
> -jsj
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I realize this thread is really old but I just got interested in it. I was
wondering how to download the instructions. I downloaded MLCAD which, as I
see it, needs .dat files and all I can get are .txt files. This is coming
from an extreme newbie but I could not figure out what the heck to do. Any
help that anyone can give me on this would be much appreciated.
Thanks
Tim
In lugnet.technic, Don Rogerson writes:
> I downloaded your .dat, Jeff and built one last night. Very cool. One thing for
> anyone else building it from the .dat - the gears that engage the shifter arm
> aren't shown in the .dat, but you can see them clearly in the photos on Jeff's
> page.
>
> I put some wide wheels on mine, and tried it on the living room carpet (lots of
> friction). It shifted into low gear and took right off!
>
>
> In lugnet.technic, Jeff Jahr writes:
> > In lugnet.technic, Jeff Jahr writes:
> > > I made a three speed, fully mechanical, automatic transmission a few weeks
> > > ago, and put a description of it on a web page. It uses a locking
> > > differential to select the gears, and I've not seen that done in lego
> > > before. If you are interested, the URL is:
> > >
> > > http://ichabod.last-outpost.com/~malakai/lego/index.html
> >
> > I've updated the page with some answers to the questions that I've been
> > asked, including the 'Is there an ldraw file somewhere' one. The answer to
> > that question is, yes, there is now. See the page for details.
> >
> > Thanks, everyone, for your responses!
> >
> > -jsj
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The .dat parts files come from LDraw. The easiest solution is to
install LDraw (www.ldraw.org ) per their instructions, then install
MLCAD in the LDraw directory, per their suggestion.
Tim Hall wrote:
> I downloaded MLCAD which, as I
>see it, needs .dat files and all I can get are .txt files. This is coming
>from an extreme newbie but I could not figure out what the heck to do.
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In lugnet.technic, Tim Hall writes:
> I realize this thread is really old but I just got interested in it. I was
> wondering how to download the instructions. I downloaded MLCAD which, as I
> see it, needs .dat files and all I can get are .txt files. This is coming
> from an extreme newbie but I could not figure out what the heck to do. Any
> help that anyone can give me on this would be much appreciated.
> Thanks
> Tim
Assuming you correctly installed LDRAW and MLCAD or other GUI and now you
want to look at downloaded *.files (models)
You're trying to download *.dat files from Lugnet database or somewhere
else, I guess.
If it's so, than, probably, your Internet explorer recognized them as pure
text files (they ARE text in real!)and saved them as *.txt
If you use any file manager as FAR, you should see your *.dat files with new
extension (mine are usually saved as something.dat.txt). Simply delete .txt
extension and it should help
hopefully I answered what you asked
bye rob
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Thanks a bunch, that worked perfectly. I feel kinda dumb now but oh well
Thank you
Tim
> Assuming you correctly installed LDRAW and MLCAD or other GUI and now you
> want to look at downloaded *.files (models)
>
> You're trying to download *.dat files from Lugnet database or somewhere
> else, I guess.
> If it's so, than, probably, your Internet explorer recognized them as pure
> text files (they ARE text in real!)and saved them as *.txt
> If you use any file manager as FAR, you should see your *.dat files with new
> extension (mine are usually saved as something.dat.txt). Simply delete .txt
> extension and it should help
>
> hopefully I answered what you asked
>
>
> bye rob
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No problem.
Actually, I had the same trouble in the beginning.. but, keep in secret! ;-)
merry christmas rob
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