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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 (...) (22 years ago, 26-Nov-01, to lugnet.technic) !!
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| | Re: Mechanical Automatic Transmission
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(...) 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 (...) (22 years ago, 27-Nov-01, to lugnet.technic)
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| | Re: Mechanical Automatic Transmission
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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 (...) (22 years ago, 28-Nov-01, to lugnet.technic)
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| | Re: Mechanical Automatic Transmission
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Dang that's awesome! I wish I coulda put one of them in this: (URL) that's shwweet. Excellent job, ha, I'm still trying to figure it out! Eric Sophie www.mylegomaster.com (...) (22 years ago, 29-Nov-01, to lugnet.technic)
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| | Re: Mechanical Automatic Transmission
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(...) Wow! Very clever. From what I know this is the first purely mechanical automatic gear shift. It's really impressive. Ciao Mario (22 years ago, 30-Nov-01, to lugnet.technic)
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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 (...) (22 years ago, 30-Nov-01, to lugnet.technic)
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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 (...) (22 years ago, 30-Nov-01, to lugnet.technic)
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| | Re: Mechanical Automatic Transmission
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(...) locked, (...) for (...) the (...) 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 (...) (22 years ago, 2-Dec-01, to lugnet.technic)
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| | Re: Mechanical Automatic Transmission
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(...) 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 (22 years ago, 2-Dec-01, to lugnet.technic)
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| | Re: Mechanical Automatic Transmission
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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 (...) (22 years ago, 3-Dec-01, to lugnet.technic)
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| | Re: Mechanical Automatic Transmission
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(...) for (...) Jeff's (...) I missed a set of gears in the .dat? Rats. I'll try to get that fixed. (...) of (...) Excellent! Send me a jpg, I'll put it on the page. ;') -jsj (22 years ago, 3-Dec-01, to lugnet.technic)
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(...) Ok, I added the missing gear axle into the dat. Thanks for pointing it out! -jsj (22 years ago, 4-Dec-01, to lugnet.technic)
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| | Re: Mechanical Automatic Transmission
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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 (...) (22 years ago, 4-Dec-01, to lugnet.technic)
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| | Re: Mechanical Automatic Transmission
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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 (...) (21 years ago, 15-Dec-02, to lugnet.technic)
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| | Re: Mechanical Automatic Transmission
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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 (...) (21 years ago, 15-Dec-02, to lugnet.technic)
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(...) 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 (...) (21 years ago, 15-Dec-02, to lugnet.technic)
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| | Re: Mechanical Automatic Transmission
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Thanks a bunch, that worked perfectly. I feel kinda dumb now but oh well Thank you Tim (...) (21 years ago, 16-Dec-02, to lugnet.technic)
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No problem. Actually, I had the same trouble in the beginning.. but, keep in secret! ;-) merry christmas rob (21 years ago, 21-Dec-02, to lugnet.technic)
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