Robotics : 16072


Robotics / 16072

Re: Posi-trac differential? —Rob Stehlik

(...) Hello Elijah, Just last week I found some interesting info on Torsen Differentials on the web. They are completely mechanical devices. This may be the type of 'positive traction' differential you are looking for. Check out www.humvee.net for (...) (23 years ago, 4-Sep-01, to lugnet.robotics)

Re: Posi-trac differential? —Mario Ferrari

(...) which (...) least (...) the (...) Hi Rob, can't wait to see the pictures of your Torsen diff! Let us know when you release them to your site. Mario (23 years ago, 4-Sep-01, to lugnet.robotics)

Re: Posi-trac differential? —Brian Alano

Got a prototype built. Easier than I thought. More friction in my prototype version than I wanted. I took some digital pics before I tore it apart. Mine was 4 x 9.5 x 5 studs in size and used 4 8t gears, 8 16t, 2 worm and 1 idler. The four 8t gears (...) (23 years ago, 4-Sep-01, to lugnet.robotics)

Re: Posi-trac differential? —Brian B. Alano

(...) version than I wanted. I took some digital pics before I tore it apart. (...) idler. The four 8t gears were the "worm wheels" meshed with the worm gear, and the 16t gears meshed in pairs to mechanically connect the two sides of the diff. The (...) (23 years ago, 6-Sep-01, to lugnet.robotics)

powering RCX2.0 —Cristian Radu

Hello, I think I remember a post about using a 9V adaptor to power some version of the RCX during testing, but could not find it on the website. Do I remember this right? Thanks! -cmr (23 years ago, 6-Sep-01, to lugnet.robotics)

Re: powering RCX2.0 —Robert Fay

RCX 1.0 is the only unit that has a 9 volt adapter port. You can use an ac or dc 9volt supply on this. The power supply for the trains is suitable. -- Bob Fay rfay@we.mediaone.net The Shop (URL) Radu" <lego-robotics@crynwr.com> wrote in message (...) (23 years ago, 6-Sep-01, to lugnet.robotics)

Re: powering RCX2.0 —Ross Crawford

(...) However many people had problems when using DC power regularly - probably becuase it burned out one half of the rectifier. I'd advise using a 10V AC adapter if you're gonna be using it regularly. (Of course you've gotta get a RCX 1.0 first!!) (...) (23 years ago, 7-Sep-01, to lugnet.robotics)

Help: RCX 1.0 power adapter —Tony Hafner

I just picked up a 1.0 set, and I looked through the documentation for info on the type of adapter to use. There appears to be nothing at all in any of the manuals. So I'm looking at the RCX itself. It says "9-12V~". Is the "~" supposed to indicate (...) (22 years ago, 31-Aug-02, to lugnet.robotics)

Re: Help: RCX 1.0 power adapter —John Barnes

I use Radio Shack 273-1631. I have a number of these and I have been using them for a couple of years. These devices have a voltage selector switch which I set to 9v. In fact, I wedge a short length of wooden tooth-pick in the switch slot to avoid (...) (22 years ago, 31-Aug-02, to lugnet.robotics)

Re: Help: RCX 1.0 power adapter —Dean Husby

"John Barnes" <barnes@sensors.com> wrote in message news:H1pMt3.Ao3@lugnet.com... (...) apparent (...) I bet if you put that radio shack supply onto a multimeter you'd notice it went as high as 13 volts... Them multi selectors are not very acurate. (...) (22 years ago, 31-Aug-02, to lugnet.robotics)

Re: Help: RCX 1.0 power adapter —John Barnes

Your comment intrigued me into checking. I grabbed a couple of transformers and checked them (with a 4 1/2 digit true rms meter). Off load (open circuit) one reads 10.4v a/c, the other 10.9v a/c. That is well within Lego's 9 - 12v a/c spec. JB (...) (22 years ago, 31-Aug-02, to lugnet.robotics)

Re: Help: RCX 1.0 power adapter —Tony Hafner

Thanks to everyone for the responses. I feel a little better about actually using the port now. I was concerned because of the speculation a while back regarding why the port was removed, and I have no intention of burning out the unit. -- Tony (...) (22 years ago, 3-Sep-02, to lugnet.robotics)

Re: RCX 1.0 power adapter —Dean Husby

"Tony Hafner" <lego@NOSPAM.hafhead.com> wrote in message news:H1opsA.EHz@lugnet.com... (...) info (...) of (...) Use a Train power pack. That's what the port had in mind when they made it. I've run pbricks for weeks with no issues. The only (...) (22 years ago, 31-Aug-02, to lugnet.robotics)

Re: Posi-trac differential? —Elijah Meeker

(...) instead of the one I was going to ask about perpetual motion machines... :o) Elijah (23 years ago, 7-Sep-01, to lugnet.robotics)

Re: Posi-trac differential? —Rob Stehlik

Hi everyone, I have finished updating my site, and have included a page for my Torsen differentials. Sorry for the wait :) you can go to my page here, and then go to the ideas section, the torsen is at the bottom of the page... (URL) go straight to (...) (23 years ago, 7-Sep-01, to lugnet.robotics)

Re: Posi-trac differential? —Dennis Williamson

Nice! I particularly like the way you put the 12-tooth gears diagonally opposite for weight balance in the turntable version. I'm going to try moving them in Brian Alano's triangle lift-arm housing (third rototype) design and see how that affects (...) (23 years ago, 7-Sep-01, to lugnet.robotics)

Re: Posi-trac differential? —Dennis Williamson

The first sentence should say "16-tooth". Dennis (...) [snip] (23 years ago, 7-Sep-01, to lugnet.robotics)

Re: Posi-trac differential? —Brian Alano

(...) *Very* nice! It's the elegant solution I couldn't conceive. (...) Agreed! (...) I looked at moving them to the diagonals, too. I'd be worried about slippage in high-torque situations. 16-tooth gear seems pretty stable already. What about (...) (23 years ago, 8-Sep-01, to lugnet.robotics)

Re: Posi-trac differential? —Dennis Williamson

I'm not sure I follow you here. Even though the 16-tooth gear doesn't mesh as deeply, it seems to be sufficient to prevent slippage. There is a little more slop, however. Note that in my suggestion to move the worm gear shaft to the diagonal, I may (...) (23 years ago, 8-Sep-01, to lugnet.robotics)

Re: Posi-trac differential? —Rob Stehlik

(...) gears are nifty for things like this. I wish there was a smaller piece that could be used to lock them on... Actually I think there is. did you use a technic triangle in your diff housing? If so, you could stick a couple of the small offset (...) (23 years ago, 7-Sep-01, to lugnet.robotics)

Re: Posi-trac differential? —Dennis Williamson

You can substitute 16-tooth gears in place of the crankshaft pieces to jam the dark grey gear. The disadvantage is the extra width. Dennis (...) (23 years ago, 8-Sep-01, to lugnet.robotics)

Re: Posi-trac differential? —Rob Stehlik

(...) Hello, Sorry I haven't updated my site yet... I will work on it tonight and tomorow night. I have been busy with going back to university. Also, one thing that was slowing me down was that both of my turntables were buried in my latest robot. (...) (23 years ago, 6-Sep-01, to lugnet.robotics)

Re: Posi-trac differential? —John Barnes

(...) Make one ;) If you're not sure you want to put a hole in the ones you have, buy some spares beyond your stock requirement for ones with cross axle holes and adjust them. As a simple tip, use a drill press. Mount the gear using black friction (...) (23 years ago, 6-Sep-01, to lugnet.robotics)

Re: Posi-trac differential? —Rob Stehlik

(...) Boy I wish there were some 40t gears with (...) Wow, words of wisdom from a true hacker! I'm not inclined to parts modification, but if I really need to, I sometimes will. When I was young without much Lego, I made some 2L and 5L axles :) I (...) (23 years ago, 7-Sep-01, to lugnet.robotics)

Re: Posi-trac differential? —Brian B. Alano

Here are some links of diagrams and explanations for the rest of us . I can't wait to see your Lego version! (...) -- ---...--- $50,000 for Jill Behrman (URL) (23 years ago, 4-Sep-01, to lugnet.robotics)