Alt-BEAM Archive

Message #01578



To: "beam@palladium.corp.sgi.com" beam@corp.sgi.com
From: Robert McIntosh robmc@acay.com.au
Date: Thu, 18 Mar 1999 08:35:53 +1100
Subject: [alt-beam] Re: [Fwd: Metal Casting]



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> find information about casting metal at home. Simple art stuff with a
> blowtorch. Anyone know anything?Dennison

http://www.lindsaybks.com has a book on casting in sand etcetera from a
forge made of a bucket lined with charcoal heated by compressed charcoal
which seemed highly practicable.
Rob



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 find information
about casting metal at home. Simple art stuff with a blowtorch. Anyone
know anything?Dennison



http://www.lindsaybks.com">http://www.lindsaybks.com">http://www.lindsaybks.com
has a book on casting in sand etcetera from a forge made of a bucket lined
with charcoal heated by compressed charcoal which seemed highly practicable.

Rob

 






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1579 Wed, 17 Mar 1999 22:47:35 +0100 [alt-beam] Why use a 4 / 6 Nv MicroCore in a walker ? (Newbie) "Hans Tolboom" Hello,

I'm a bit new in the BEAM principle and I'm trying to figure
out the MicroCore. As a starting point I've use the site of
Andrew Miller, 'How to make a walker'.

To explain it he used a 6 Nv microcore circuit like this :
---
1 -| |- 4
2 -| |- 5
3 -| |- 6
---

The MicroCore has 4 states :

1 - saturated state
2 - Two process state
3 - Single process state
'1' does 1->2->3->4->5->6->1-> etc.
the rest is '0'
4 - Null state

For a two-motor walker all you need is a circuit with 4 Nv's.
To walk the Microcore has to be in the single process state.

To me this behaviour looks a lot like the behaviour of a 4
bit shift register like a 74hc194 (up/down shift). If you
you change the wiring to
1 = Qa 3 = Qb
2 = Qc 4 = Qd,
the walker will walk in the same way as with a 4 Nv net.
The only difference between a 4 Nv and a 4 bit shift is that
the 74hc245 can provide itself with a puls-generator and the
4 bit shift needs an external (NE555 ?) controlled puls-
generator.

Can anyone explain to me what the real advantage of a nervous
net (used for a walker with 2 or 3 motors) is compared to
something like a 4 (or 8) bit shift reg. ??



thanks, Hans


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