Alt-BEAM Archive
Message #12066
To: beam@sgiblab.sgi.com
From: "Jason -" evenflow88@hotmail.com
Date: Sat, 18 Mar 2000 10:04:58 GMT
Subject: [alt-beam] Re: Mark Tilden Tact(Mr.mark T please reply)
>From: Dave Hrynkiw
>Reply-To: beam@sgiblab.sgi.com
>To: beam@sgiblab.sgi.com
>Subject: Re: Mark Tilden Tact(Mr.mark T please reply)
>Date: Sat, 18 Mar 2000 00:38:59 -0700
>
>At 08:28 PM 3/17/00 , Jason - wrote:
>
>>nickel welding rod? are they easy to be bend?
>
>Not bad. Depends on what you happen to find. I've bought stuff that's
>softer than music wire to bend (nickel vs. steel - you guess which is
>tougher!), but I've also stumbled on a few pieces that were a real bear to
>bend, even more so than steel. But even the weakest is nice to work with.
>
>> and where could i get them
>
>Look up "welding supplies" in your yellow pages. Explain you're looking for
>a high-nickel content welding rod, and they'll set you up. Just be ready to
>pay for it - it ain't cheap!
>
>>........what about those tactile sensors........is there any hints that i
>>could use to make really tough tactile sensors other tha using piano
>>wires.....cause i cant find it here....thanks
>
>
>You can't find music wire? Check any hobby/craft store for a K&S display.
>They're everywhere.
>
thanks a lot dave but what is a K&S display........
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12067 Sat, 18 Mar 2000 10:27:50 GMT [alt-beam] Re:Dave stryder Jr. beam@sgiblab.sgi.com "Jason -"
and what material did u use for the leg ofyour stryder jr. and whats the
gold thinghy on the feet........it is so similar to mark T bit botz
leg......thanks.......
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12068 Sat, 18 Mar 2000 04:17:54 PST [alt-beam] Re: irrelevant...? beam@sgiblab.sgi.com "Timothy Flytch" >the questions concerning what cap and resistor size to use are not off
>topic
>~ those in my pinion are what this list is suppose to be about
>
>or was i mistaken???
>Steve
The perpous of this list (or any list) is for like minded people from around
the world can meet in one "room" and discuss there common interest...
In this case BEAM and related... but it is a lot like going to an event and
talking with friends, most of the conversation is on subject and some is
about the buffet table...
I wish I had the ability to travel around and meet you all personally :)
Timothy...
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12069 Sat, 18 Mar 2000 05:21:25 -0800 (PST) [alt-beam] Aquaroids beam@sgiblab.sgi.com Lee Golden I just saw a news clip about those japanese solar
powered aquarium robots. The clip showed a robotic
jellyfish, goldfish, crab, shrimp, and a few others.
They have a collision avoidance system built in to
help them avoid the sides of the tank and other robots
that are swimming nearby. The jellyfish seemed to be
maintaining its level in the tank by spinning its
propellor every few seconds when it started sinking.
They are supposed to go on the market (the clip didn't
specify Japanese or American) this fall for a cost of
about $140.00 US each. I have yet to be able to find
any substantial information about them on the web. It
would be interesting to reverse engineer one to see
how they handle object avoidance, depth detection,
etc. etc.!!!
Lee Golden
http://www.geocities.com/leemon1/Bots/Lotsabots.html
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12070 Sat, 18 Mar 2000 05:52:16 -0800 (PST) [alt-beam] Aesthetics beam@sgiblab.sgi.com Randy Howard Hi, i'm been on BEAM for half a year now, and i have a
suggestion:
Just wunderin',
What if we put our PCB's on transparencies?
(you know, transparent plastic)
Print PCb's out, photostat em' onto trans, and since
carbon conducts electricity, pathways can be made.
components can be stuck by whatever means, like
conducting epoxy, or sticking another piece of plastic
onto the connections and melting em' , i.e. laminatin'
em'.
Would look nice if wrapped around caps, or motors :)
any comments? (or criticisms?) :)
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12071 Sat, 18 Mar 2000 09:11:55 -0800 Re: power filter caps question SG
>
> How fast is it?
> how many feet per second?
> (For referance reasons)
> -Sparky
>
> At 01:39 PM 3/17/00 -0800, you wrote:
> >I really appreciate this reply. Thanks Dilip!
> >
> >As far as the race walking goes, my bot seemed to lose a lot of
motivation
> >when it went on a diet of batteries. I had been using a computer 5V
power
> >supply before. Also, I *may* have fallen victim to "Gushing New Father
> >Syndrome" and percieved the thing as going faster than it was. Anyhow,
it
> >plods along just fine now, and the mechanics are going to be used as a
test
> >platform. My next (baby) step will be to power it from a master/slave
> >bicore. From there I'll start adding sensors to both the microre and the
> >bicore circuits, and keep finding what works and what doesn't....
> >
> >
> >Thanks again!
> >
> >Jeff
> >
> >----- Original Message -----
> >From: Sathe Dilip
> >To:
> >Sent: Thursday, March 16, 2000 11:56 AM
> >Subject: Re: power filter caps question
> >
> >
> >
> >
> >> "Jeffrey B. Williams" wrote:
> >
> >> 1) Does the cap, in parralell to the power pins of the IC filter all
> >> the variations (AC current) through it to the ground rail so that they
> >> do not influence the chip? (In other words, I'm clueless and would
> >> like an idea on why it works..)
> >
> >More or less. The value of the capacitor decides what frequencies will
> >be sent to the ground. Smaller the capacitor, higher is the cut off
> >frequency beyond which it will be effective in sending the
> >variations/spikes/noise to ground. The type of the capacitor also
> >matters. An electrolytic capacitor will not do as good a job as a
> >ceramic in this situation
> >
> >> 2. Can a put a single capacitor in parralell to a series of chips,
> >> cores, ....whatever to stabilize them, instead of a cap per chip.
> >
> >No. Distributed is the word. One cap per chip (particularly the ones
> >that contribute to the spikes/noise and the ones that are susceptible to
> >the spikes/noise. The reason is, the cap has to be as close to the
> >source/target (of noise) as possible to be effective. Even the lead
> >length matters in severe cases. (PCB track/wire inductance and to a
> >lesser extent resistance helps noise in its dirty work)
> >
> >> 3. What's a good size for these beasts. To be honest a single .22uf
> >> worked to stabilize my walker, but I still don't have that warm fuzzy
> >> feeling that tells me its not just waiting to go up in flames. I
> >> have the impression that they should be larger, but what is too large?
> >
> >One 10kpF to 100kpF ceramic (monolithic chip ceramic - MLC is also fine)
> >capacitor per chip is generally good enough.
> >
> >> Now that it's tamed, I don't know why its called a walker.... The
> >> thing runs and scampers pretty darn quick...
> >
> >May be its practicing race walking? :-)
> >
> >Dilip
> >--
> >----------------------------------------------------------------------
> >The early bird may get the worm, but the second mouse gets the cheese.
> >----------------------------------------------------------------------
> >
> >
>
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