HDTenEightyP/NetNews huggingface dataset:
From: kcarroll@zoo.toronto.edu (Kieran A. Carroll)
Subject: Re: Trouble with stepper motor
Date: Wed, 19 Aug 1992 14:52:21 GMT
Organization: U of Toronto Zoology

>In article <1992Aug14.214916.4173@colorado.edu> mathis@tigger.cs.Colorado.EDU (Don Mathis) writes:
>}I've got a 4-phase stepper motor that I'm trying to control, by
>}sending it the required sequence of 4-bit patterns (1001, 1010, 0110,
>}0101, repeat), and the motor runs for 2-6 seconds (hundreds of steps)
>}and then it gets confused and just starts wiggling.
>}
>}The motor behaves as it would behave if it had gotten out of
>}synchronization with the step commands, but I can't imagine why this
>}would suddenly happen after hundreds of successful steps.
>}
>}Can anyone give me some advice?

I've been invoved in doing detailed simulations of stepper
motor dynamics, recently, for a spacecraft antenna gimbal
project. We're simulating a device that will actually fly,
and so have put a lot of effort into finding ways to make it
fail (so that we can fix them). We've also gathered a lot of
stepper motor data from manufacturers. What you describe
sounds like one of two effects:
 
o If the torque applied to the stepper motor exceeds
  its rated torque, then it will lose synchronization.
  This can happen due to either externally applied torques
  such as friction, or due to inertial torques (i.e., you're
  trying to accelerate the load too quickly).
o Every stepper motor has an internal mechanical resonance
  frequency. This will depend on the amount of rotational
  inertia attached to the output shaft (the greater the
  inertia, the lower the frequency). When your step rate
  equals this frequency, slipping can happen, especially
  if the motor is experiencing a large torque at the time.

Hope this helps...
-- 

     Kieran A. Carroll @ U of Toronto Aerospace Institute
     uunet!attcan!utzoo!kcarroll kcarroll@zoo.toronto.edu
Newsgroups: comp.robotics
From: rkh@wpi.WPI.EDU (R Kurt Heinzmann)
Subject: Re: balancing_act
Organization: Worcester Polytechnic Institute
Date: Mon, 17 Aug 1992 22:45:10 GMT

How about the gyros sold for use in RC helicopters?

Kurt
Newsgroups: comp.robotics
From: hattori@convex.com (Mato Hattori)
Subject: Re: Trouble with stepper motor
Date: Mon, 17 Aug 1992 05:21:06 GMT
Organization: Engineering, CONVEX Computer Corp., Richardson, Tx., USA
Keywords: stepper motor
X-Disclaimer: This message was written by a user at CONVEX Computer
              Corp. The opinions expressed are those of the user and
              not necessarily those of CONVEX.

Usually, average stepper motors have only  response ability of 1 to 5 KHz.
Probably, you provide pulse of almost 5 KHz, aren't you?
If you want to get more fast revolution, try 5 phase motors.
--
Mato Hattori
Convex Computer, U.S.A.       email: hattori@convex.com
3000 Waterview Parkway        office: 1+214-497-4304
Richardson, Texas 75083       home:   1+214-424-4655
Newsgroups: comp.robotics
From: jkubicky@cco.caltech.edu (Joseph J. Kubicky)
Subject: Source for conductive silicone sheets?
Organization: California Institute of Technology, Pasadena
Date: Mon, 17 Aug 1992 22:14:33 GMT


I'm looking for a source of condituve silicone sheeting, say 1mm or so
thick (although I might also be interested in a little thinner).  The
application is a sensitive tactile sensor.

Jay Kubicky
jkubicky@cco.caltech.edu

Newsgroups: comp.robotics
From: ktc@onan.jhuapl.edu
Subject: Re: balancing_act
Organization: Johns Hopkins University
Date: Fri, 14 Aug 92 19:32:17 GMT

In article <1992Aug14.181900.26605@ee.ubc.ca> williamb@ee.ubc.ca (william  
burchill) writes:
> Could somebody post some information or suggest a book on sensors 
> for detecting balance, i.e. orientation relative to the horizontal plane?
> I'm praticularly interested in knowing what different types are available. 
> Are there any without moving parts?
> 
> I recently saw a t.v. program which showed a 1 legged hopping robot in
> action. How did this sense its balance? Could someone direct me to a 
> technical publication on this work?
> 
> thanks.

Check out anything by Marc Raibert (e.g, Legged Robots that Balance, MIT Press,  
1986, or CMU reports CMU-RI-TR-83-20, CMU-LL-4-1985). The machine in question  
used an inertial reference (gyroscope) to sense up. I seem to recall he had  
problems with keeping bearings in the gyros due to impact loading (falling  
down?)

Kim
Newsgroups: comp.robotics
From: mathis@tigger.cs.Colorado.EDU (Don Mathis)
Subject: Trouble with stepper motor
Keywords: stepper motor
Organization: University of Colorado, Boulder
Date: Fri, 14 Aug 1992 21:49:16 GMT

I've got a 4-phase stepper motor that I'm trying to control, by
sending it the required sequence of 4-bit patterns (1001, 1010, 0110,
0101, repeat), and the motor runs for 2-6 seconds (hundreds of steps)
and then it gets confused and just starts wiggling.

Has anyone else had this problem?  

The motor behaves as it would behave if it had gotten out of
synchronization with the step commands, but I can't imagine why this
would suddenly happen after hundreds of successful steps.

Can anyone give me some advice?

Thanks,
	Don Mathis                mathis@cs.colorado.edu
From: cmcmanis@pepper.Eng.Sun.COM (Chuck McManis)
Newsgroups: comp.robotics
Subject: Re: Where do i get gears and things ?
Date: 17 Aug 1992 19:34:30 GMT
Organization: Sun Microsystems, Mt. View, Ca.
NNTP-Posting-Host: pepper

On a related question, has anyone tried acrylic casting to make
mechanical parts? While I have access to a source of various
gears and such I can never find the ones I want to build the
subsystems I want. Having seen some of the cool things that
people have made out of acrylic it seemed a natural for building
custom parts. (Yes, I've read the PlaStock catalog :-))

Anyway, to make a short story long, I'm trying to track down some
useful (ie non-generic, more specific) information on making
molds for acrylic and casting it.


--
--Chuck McManis						    Sun Microsystems
uucp: {anywhere}!sun!cmcmanis   BIX: <none>   Internet: cmcmanis@Eng.Sun.COM
These opinions are my own and no one elses, but you knew that didn't you.
"I tell you this parrot is bleeding deceased!"
Newsgroups: comp.robotics
From: nitish@cs.sfu.ca (Nitish Mandal)
Subject: Cartesian Model-Based controllers
Organization: CSS, Simon Fraser University, Burnaby, B.C., Canada
Date: Sun, 16 Aug 1992 00:18:19 GMT

Hi, I am working on a 2DOF DD robot. We have a DSP controller,
which permits us very low sampling times. Recently we implemented
a joint space model-based controller, and the performance is quite
good. My thesis is in the area of force control. From my experience with
model-based schemes, I have found sampling time to be crucial to their
performance, especially since we plan to use it for force control. My 
question is, has anyone implemented a cartesian-model-based scheme on 
a robot? If so, how was the performance? What is the approximate
increase in computational time? Is it really of any advantage to
use a cartesian scheme, especially for force control?

Any help would be useful.


Thanks,
-Nitish.
nitish@cs.sfu.ca
From: markey@flash.ATC.Olivetti.Com (Tim Markey)
Newsgroups: comp.robotics
Subject: Muscle Wire
Date: 14 Aug 92 17:08:50 GMT


    Has played with muscle wire?  There are kits available for an 
    outrageous price.  What I want to know is how strong is this stuff?
    Could it ever be used for artificial limbs? 

    TJM
Xref: sparky comp.robotics:1607 sci.image.processing:504 comp.ai:3164
From: johnson@akula.llnl.gov (  Robert Johnson          )
Newsgroups: comp.robotics,sci.image.processing,comp.ai
Subject: 3D Grasp Planning
Date: 20 Aug 92 20:15:44 GMT
Reply-To: johnson@akula.llnl.gov (  Robert Johnson          )
Followup-To: comp.robotics
Organization: Lawrence Livermore National Laboratory

Hi,

   I am looking for references (and/or software) on 3D representations
and algorithms suitable for robot grasp planning from range (or stereo)
images.

   We are currently using stereo vision to reconstruct the 3D
surface of an object and then performing a 2D grasp analysis by simply
projecting the surface data into the xy plane.  This provides a constrained
grasp pose with the gripper oriented parallel to the xy plane.  We are now
interested in unconstrained grasping in which the 3D data is used to
determine grasps with arbitrary gripper orientations.

   Any help would be greatly appreciated.  Please respond by E-mail. 

   Thank you!


---------------------------------------
Robert K. Johnson
Lawrence Livermore National Lab
Phone: (510) 422-8375
Email: johnson@akula.llnl.gov
From: jkubicky@cco.caltech.edu (Joseph J. Kubicky)
Newsgroups: comp.robotics
Subject: Sensitive tactile sensor - ideas?
Date: 17 Aug 92 22:19:45 GMT
Organization: California Institute of Technology, Pasadena


I'm trying to build a sensitive tactile sensor.  Something that is reliable
down to, say, a few g/cm^2.  It must be fairly thin, and it would be nice
if it were flexible.  I've tried some sensors from a company called Interlink
in Santa Barbara.  They would have been perfect, except they didn't work well
at low pressures (not very repeatable - they seem to have some hysterisis due
to their design).  Maximum pressure will be small.

Ideas?

Jay Kubicky
jkubicky@cco.caltech.edu
From: timd@upurbmw.dell.com (Tim "You'll get no SLACK" Deagan)
Newsgroups: comp.robotics
Subject: Re: WANTED: POLOROID ULTASONIC SENSOR
Date: 13 Aug 92 21:36:57 GMT
Organization: Dell Computer Service Tools Development

At one time in the recent past I discovered that Radio
Shack carries the Polaroid Ultrasonic Sensor as a spare
part (not in stock, but they will order it for you) for
the ultrasonic measuring tape they sold (may still sell).

I don't remember the price, but it was around $20.  Not a 
great bargain, but at least there are Radio Shacks evrywhere.

--Tim

--
===============================================================
timd@upurbmw.dell.com        My employer is not responsible 
                                  for anything I say.
From: tony@jassys.UUCP (Tony Holden)
Newsgroups: comp.mail.uucp
Subject: modem results codes messing up login
Date: 22 Aug 92 02:29:00 GMT
Organization: HSC CO.

Ok I know this should be an easy one, and as long as I've been a SA I
should know the answer to this one.  So be gentle, I'm kinda
embarrassed to ask this ;-)

I've seen this on a recently on a couple of systems, a rs/6000 and a
motorola unix box.  

The tty ports are configured as dial in/out ports with a modem
attached.  The dialer program looks for result codes so the modem is
configured to echo the results.  But when the modem answers a call the
results codes (CONNECT xxx ... ...) are echoed to the login program.

How do I control this?  Do I set the dialer script to not use the
results codes (\e) or is there a better way?

Oddly this is something that the PC versions of unix handle better
than the workstations.

TIA


-- 
Tony Holden					live on the edge,
tony@jassys					  Bank in Texas
jassys!tony@rwsys.lonestar.org
From: Rick.Ellis@ofa123.fidonet.org
Newsgroups: comp.mail.uucp
Subject: UF-Gate
X-Sender: newtout 0.01 Jul 13 1992
Date: 16 Aug 92  19:15:47

On <Aug 15 19:15> Carlos Amezaga writes:

 CA>        Can anyone direct me to an FTP site which has UF-Gate?  I read in
 CA> the book "Managing UUCP and Usenet" that this was a shareware product.  I
 CA> have a freind who is interested in using it and would like to try it out.
 CA> Any help would be appreciated.  Thanks.. :-)

Try ftp.ieee.org.  Be sure to pickup UUSL_Y05 as well.
From: ian@airs.com (Ian Lance Taylor)
Newsgroups: comp.mail.uucp
Subject: Re: Smail 3.1.25 transport uux problem
Date: 16 Aug 92 19:31:49 GMT

naughton@chinet.chi.il.us (Thomas Naughton) writes:

> naughton@chinet.chi.il.us ... transport uux: child returned status EX_1 (1)

I have no idea what version of UUCP you are running.  However, it was
recently pointed out to me that the uux in Taylor UUCP always exits
with 1 on failure, rather than using an exit code which mailers know
how to interpret (this will be corrected, eventually).  If you are
running Taylor UUCP, or even if you aren't, you should check the UUCP
log files, to see if any error message appears there.  I assume that
smail would be returning any messages uux writes to stderr, and that
no such messages are being written.
-- 
Ian Lance Taylor                ian@airs.com                uunet!airs!ian
First person to identify this quote wins a free e-mail message:
``I would prefer my life to contain more hours of pain, if that means
  that none of this pain is still to come.''
Newsgroups: comp.mail.uucp
From: randy@psg.com (Randy Bush)
Subject: Re: UF-Gate
Organization: Pacific Systems Group, Portland Oregon, US
Date: Sun, 16 Aug 1992 20:07:15 GMT

> Can anyone direct me to an FTP site which has UF-Gate?  I read in
> the book "Managing UUCP and Usenet" that this was a shareware product.

ftp.psg.com:~/pub/fidonet/ufgate/*
-- 
randy@psg.com   ...!uunet!m2xenix!randy
From: pozar@kumr.lns.com (Tim Pozar)
Newsgroups: comp.mail.uucp
Subject: Re: UF-Gate
Date: 19 Aug 92 16:59:59 GMT
Organization: Late Night Software (San Francisco)

overlord@megalith.miami.fl.us (Carlos Amezaga) writes:
>	Can anyone direct me to an FTP site which has UF-Gate?  I read in
>the book "Managing UUCP and Usenet" that this was a shareware product.  I
>have a freind who is interested in using it and would like to try it out.
>Any help would be appreciated.  Thanks.. :-)

   You can FTP ufgate from zeus.ieee.org.

                       Tim

-- 
Internet: pozar@kumr.lns.com               FidoNet:  Tim Pozar @ 1:125/555
UUCP:     ...!uunet!kumr.lns.com!pozar
Snail:    Tim Pozar / KKSF / 77 Maiden Lane / San Francisco CA 94108 / USA
Voice:    +1 415 788 2022
From: Mark.Milhollan@ofa123.fidonet.org
Newsgroups: comp.mail.uucp
Subject: UF-Gate
X-Sender: newtout 0.01 Jul 13 1992
Date: 17 Aug 92  08:17:06

Rick Ellis wrote: 
 
> On <Aug 15 19:15> Carlos Amezaga writes: 
 
>>        Can anyone direct me to an FTP site which has UF-Gate?   
 
> Try ftp.ieee.org.  Be sure to pickup UUSL_Y05 as well. 
 
Don't you need a newer version? :) 
                       
___ XRS/XCS 1.02
 * Origin: Duh-no, whazza "tag", err, "brag" line? (1:103/208)

--- Maximus 2.00
From: naughton@chinet.chi.il.us (Thomas Naughton)
Subject: Smail 3.1.25 transport uux problem
Organization: Chinet - Public Access UNIX
Date: Sat, 15 Aug 1992 18:29:02 GMT

   This is the error message that I'm getting when I ussue a command
such as:
	smail naughton@chinet.chi.il.us < $HOME/.profile

 Xfail: <naughton@chinet.chi.il.us> reason: (ERR_144) transport uux: child retur
ned status EX_1 (1)
|------------------------- Failed addresses follow: ---------------------|
 naughton@chinet.chi.il.us ... transport uux: child returned status EX_1 (1)
|------------------------- Message text follows: ------------------------|
Received: by nauts.chi.il.us (/\==/\ Smail3.1.25.1 #25.3{nauts})

   I don't get the message from internal mail, just when I try to get
to the outside world.  ERR_144 tells me that uux is returning an non-
zero result code, but I don't know why.  Any help would be appreciated!



-- 
Thomas M. Naughton	              "Love is chemistry, but sex is physics"
naughton@nauts.chi.il.us (prefered)   naughton@chinet.chi.il.us (alternate)
Nobody is responsible for anything I say or do but me.  Sometimes not even me.
From: cs000rdw@selway.umt.edu (Richard D Warner)
Newsgroups: comp.mail.uucp
Subject: Setting up UUCP network
Keywords: Strategies
Date: 14 Aug 92 03:02:19 GMT
Organization: University of Montana


	I work for an agency that divides the state into four areas and
has about eighteen field offices per area.  We want a good email network for the
state.  Important goals are reliable point-to-point UUCP mail, plus a news 
network.  We have a state office plus four area offices.
	There are a number of point-to-point strategies we've been looking at.
For one, we could have all machines know all other machines in the whole 
State.  This is fastest, but less reliable because each field office has
to maintain all the links.  A more reliable approach seems to be to have
all of the field offices feed into an area office, which forwards the calls
to the state office or the other area.  
	You get the idea.  Plus, we have access to the much-talked-about
FTS 2000 services, but don't really know how to put it to the best use.
My question is what sources (such as white papers, books, etc.) are available
to help us plan out this network?  We need strategy information, tradeoffs,
design considerations, that sort of thing.  Plus, this FTS 2000 is really 
a wild card at this point.  Any help in that arena would be appreciated.
Thanks in advance.



R.D. Warner
From: makey@VisiCom.COM (Jeff Makey)
Newsgroups: comp.mail.uucp
Subject: Problem with apostrophe in mail address
Date: 18 Aug 92 22:54:25 GMT
Organization: VisiCom Laboratories, Inc., San Diego, California

Any idea why uuxqt barfs on an address with an apostrophe in it?  My
mail feed normally works fine, but attempts to send to an address with
an apostrophe in it gives an error like the following from the remote
system.

  uuxqt cmd (rmail O'Name@valid.domain.name ) status (DENIED)

I checked, and the apostrophe is not a special character in RFCs 821
and 822.  Putting a single backslash ("\") character in front of the
apostrophe doesn't help.  The system doing the complaining is a VAX
8600 running 4.3 BSD.

                           :: Jeff Makey

Department of Tautological Pleonasms and Superfluous Redundancies Department
    Disclaimer: All opinions are strictly those of the author.
    Domain: makey@VisiCom.COM    UUCP: nosc!visicom!makey
From: Peter Smode <psmode@jeslacs.wimsey.bc.ca>
Newsgroups: comp.mail.uucp
Subject: Can't connect site with FSUUCP v1.3
Date: Fri, 21 Aug 92 13:12:59 PDT
Organization: JES Library Automation, Coquitlam BC, CANADA

I have been trying to connect to polyslo.calpoly.edu to get pub/fsuucp13r1.zip
without success. I run through the ftp mailserver at decwrl, and it keeps
sending back session logs that show a failure to connect.

Is FSUUCP 1.3 available yet? Is it available from polyslo? Is there another
site which may have it?

**************************************************************************
*   Peter Smode                 E-mail:    psmode@jeslacs.wimsey.bc.ca   *
*   JES Library Automation      Voice:     (604)939-6775                 *
*   Coquitlam, BC, CANADA       Fax:       (604)939-9970                 *
**************************************************************************
Xref: sparky comp.mail.uucp:1687 news.answers:2563
From: larry@gator.rn.com (Larry Snyder)
Newsgroups: comp.mail.uucp
Subject: Re: UF-Gate
Date: 19 Aug 92 10:39:25 GMT
Organization: The Gator Public Access Unix Site - 219-289-3745

mjo@ef2007.efhd.ford.com (Mike O'Connor) writes:

>Are Fidonet echoes being gatewayed into the Usenet?  I mean, is there
>a whole fido.* hierarchy out there and I'm just not getting it?

it's not officially available, however -- some sites have access to
it

-- 
Larry Snyder                                    internet: larry@gator.rn.com
keeper of the Gator                                  uucp: uunet!gator!larry
Newsgroups: comp.mail.uucp
From: overlord@megalith.miami.fl.us (Carlos Amezaga)
Newsgroups: comp.mail.uucp
Subject: UF-Gate
Keywords: 
Distribution: world
Date: 16 Aug 92 01:35:18 EST
Organization: None

	Can anyone direct me to an FTP site which has UF-Gate?  I read in
the book "Managing UUCP and Usenet" that this was a shareware product.  I
have a freind who is interested in using it and would like to try it out.
Any help would be appreciated.  Thanks.. :-)

Carlos
--

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%    __     %  UUCP:  overlord@megalith.miami.fl.us  % I Tried MS-DOS Once %
% __///     %  Fido:  1:135/92                       % But Didn't Inhale.  %
% \\//Amiga %  GEnie: C.Amezaga                      %        --D.Atkins-- %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
Newsgroups: comp.mail.uucp
Subject: Re: modem results codes messing up login
From: denny@dakota.alisa.com (Bob Denny)
Date: Sun, 23 Aug 1992 06:09:34 GMT
Organization: Alisa Systems, Inc.

In <96@jassys.UUCP> tony@jassys.UUCP (Tony Holden) writes:

> [...]
> The tty ports are configured as dial in/out ports with a modem
> attached.  The dialer program looks for result codes so the modem is
> configured to echo the results.  But when the modem answers a call the
> results codes (CONNECT xxx ... ...) are echoed to the login program.
> 
> How do I control this?  Do I set the dialer script to not use the
> results codes (\e) or is there a better way?

Worse, on many modems, if login echoes the result codes back to the modem
while it's still handshaking, it will cause the connection to be aborted. 

Configure the modems to be quiet (ATQ1E0) "permanently", so that when
carrier is lost or DTR is dropped, the modem will reset to that state. Then
have your dialer scripts start out with ATQ0E1..., which will enable echo
and result codes during dial-outs. 
_______________________________________________________________________________
Robert B. Denny                                           voice: (818) 792-9474
Alisa Systems, Inc.                                         fax: (818) 792-4068
Pasadena, CA                         (denny@alisa.com, ..uunet!alisa.com!denny)
Newsgroups: comp.mail.uucp
From: elitman@rac2.wam.umd.edu (Eric A. Litman)
Subject: L.sys chat script
Organization: U. of Maryland, College Park.
X-Newsreader: Tin 1.1 PL4
Date: Sat, 15 Aug 1992 21:24:05 GMT

I have recently been offered a uucp connection from a local Internet site, and
have configured my system accordingly. However, I am having a bit of a problem
with the chat script.

In my script, I log into an Annex terminal server, then to an account on a 
machine connected to the Annex, then rlogin -8 to the uucp host. All goes
well in the connection up to the point where the script interacts with the
shell, at which point it hangs. 

To successfully send the password to the remote host, I must have a \n\c
following the text to be entered. on the next line:

	UU:~5-\n-UU: uucall \

where 'UU:' is the prompt on the account, and uucall is an alias to a rlogin
-8 command. For some reason, the 'uucall' is not being interpreted by the 
shell (I've used both csh and tcsh, the later being totally unusable in this
circumstance). Using uucico at debug level 6, I see that 'uucall' is sent
but a line feed is not performed, and the shell gives no reply. The cursor
merely returns to the beginning of the line. If I append \n or \n\c to the 
line, stderr reports that 'uucall' is not found. I have only used the alias 
'uucall' because I saw the same error message when using 

'rlogin\s<uucp host deleted>\s-8\s-l<account name deleted>' 

The shell interpreted $# as the entire command - it reported that 
'rlogin <uucp host> -8 -l <login name>' was not found.

This leads me to believe that uucico and uupoll are sending some other 
characters with the text I have input. Strangely enough, appending a \r
to the line has no effect whatsoever.

Logging into the account manually, I am able to perform all of the above
functions effortlessly.

I am running the NeXT 2.1 standard UUCP software on an '030 cube.

Does anyone have any ideas on this? I would appreciate any information or
suggestions.

--
Eric A. Litman  #import <std/disclaimer.h> | NeXTMail, MIME accepted - please 
U. of Maryland, NeXT Campus Consultant     | indicate in Subject line.