HDTenEightyP/NetNews huggingface dataset:
From: jrtz@stat1.bst.rochester.edu (John Ritz)
Newsgroups: sci.engr.mech
Subject: Examples of Statistical Experim. Designs ?? Anyone ?
Date: 6 Oct 92 03:21:28 GMT
Organization: University of Rochester - Rochester, New York


 

	Examples of Statistical Experim. Designs ?? Anyone ?

	
	I would be interested in seeing some explicit examples 
        of people using Statistical Experimental Designs : 
        One - and Two - way ANOVA , Randomized Block , 
        Mixed effets , Latin Squares , Factorial etc. , 
        in this area of science. If you have any , please 
        email me at jrtz@stat1.bst.rochester.edu . You 
        can give a reference to a Journaltogether with 
        volume , no. and pagenr. ( e.g. Technometrics , vol.11 ,     
        no.1 .. ) .

        Thx !
Newsgroups: sci.engr.mech
From: knipe@mksol.dseg.ti.com (richard l knipe)
Subject: Thin Film Strength
Organization: Texas Instruments
Date: Tue, 29 Sep 1992 15:15:06 GMT

Fellow Mechanical Engrs.

I am looking for yield strength data on thin film aluminum
alloys.  My film thickness is in the 600 Angstom thick range.
I have read the many journals and there appears to be a lack
of good thin film property data.

If someone out there is currently engaged in thin film property
research and they are specifically studing aluminum films, I am
very interested in your work.

My experimental work with aluminum thin films has shown the 
following behavior:

1:  Young's Modulus nearly matches the value obtained from bulk
    specimens.

2:  Aluminum thin film layers appear to have very large yield 
    strengths.

3:  Aluminum thin films can cycled for billions of cycles with-
    out failure (stress amp = 20 ksi, R = -1).


Why are thin films so strong?  Email me and I will summarize.


R. Knipe
knipe@me.uta.edu
or
knipe@mksol.dseg.ti.com

Newsgroups: sci.engr.mech
From: rizzo@cbnewsf.cb.att.com (anthony.r.rizzo)
Subject: Re: propeler question
Organization: AT&T
Distribution: na
Date: Wed, 30 Sep 1992 18:36:28 GMT

In article <1992Sep30.010413.4447@odin.corp.sgi.com> bschmidt@maybeck.mti.sgi.com (Bill Schmidt) writes:
>One propeller counteracts the torque produced by the other.  Therefore
>the craft will not be a whirling dervish at zero or low speeds.

I'm not quite sure that that is the overriding reason.

If memory serves me, a single propeller imparts some
angular momentum to the air stream.  The second, trailing propeller
does the same, but in the reverse direction.  The combined effect,
i.e., the effect of the two counter-rotating propellers is to
impart zero (or nearly zero) angular momentum to the air stream.
The result is increased propulsion efficiency, since it takes
energy to spin the air as well as to propell it rearward.
But, I've been known to be wrong... occasionally.
Maybe there are some aerobrains out there who could comment. ;-)

Tony Rizzo

Newsgroups: sci.engr.mech,alt.cad
From: ekaas@cs.sfu.ca (Erik Kaas)
Subject: Best Universities
Keywords: CAD, CAM, CAE Universities
Organization: CSS, Simon Fraser University, Burnaby, B.C., Canada
Date: Fri, 25 Sep 1992 21:16:55 GMT


Can anybody give me an overview of the Universities
(located in the USA or Canada) that have the best
Department of Mechanical Engineering (dept. must be
working on CAD, CAM, or CAE)???

Newsgroups: sci.engr.mech
From: monwel@cbnewsk.cb.att.com (douglas.w.monroe)
Subject: Re: flow nozzles?
Organization: AT&T
Distribution: usa
Date: Fri, 2 Oct 1992 14:55:48 GMT

In article <1992Oct1.224653.19652@mksol.dseg.ti.com> dahla@mksol.dseg.ti.com (alexander dahl) writes:
>In article <1992Sep30.194341.1@kean.ucs.mun.ca> scasey@kean.ucs.mun.ca writes:
>>Hi, I'm a first term engineering student who has a little bit of 
>>research to do. Where would be a good place to look for info on a 
>>'flow nozzle' ? Thanks in advance :^)  Sue
>
>Try the Library first.
>

BRAVO!, Good answer! Too many times do we have postings asking the netfolks
to do the legwork. Perhaps it seems easier to sit at your terminal and type
in a request for info when it would be more considerate, more timely, more
educational, etc, etc. to simply go to the library. I am continually amazed
at the fact that so many people have never heard of the Thomas Register
for example. How many times have we all seen "Where can I find ProductX" 
postings? Not to  pick on you Sue, but the answer you got was exactly the
one you should have received. That is  unless you've already visited the
library, in which case you should have told us that in your post.
Just my 2 cents...

P.S. Besides the Thomas register, people ought to check out news.answers more
often, IMHO of course (lots of FAQ lists there)
-- 
                                                          Doug Monroe
                   				       dwm@pruxl.att.com
  						 or   monwel@cbnewsk.att.com
Newsgroups: sci.engr.mech
From: dahla@mksol.dseg.ti.com (alexander dahl)
Subject: Re: flow nozzles?
Organization: Texas Instruments, Inc
Date: Thu, 1 Oct 1992 22:46:53 GMT

In article <1992Sep30.194341.1@kean.ucs.mun.ca> scasey@kean.ucs.mun.ca writes:
>Hi, I'm a first term engineering student who has a little bit of 
>research to do. Where would be a good place to look for info on a 
>'flow nozzle' ? Thanks in advance :^)  Sue

Try the Library first.

-- 
Alex Dahl
dahla@lobby.ti.com           or        dahla@mksol.deseg.ti.com

Remember:  My expressions are unknown to my employer nor do they care.
Newsgroups: sci.engr.mech
From: acampane@magnus.acs.ohio-state.edu (Angelo Campanella)
Subject: Re: propeler question
Organization: The Ohio State University
Distribution: na
Date: Sat, 3 Oct 1992 04:03:59 GMT

The counter-rotating propeller helps reduce or eliminate the waste of energy on
spurious angular momentum in the slip-stream as note by Tony Rizzo.

The remaining question is "does the second propeller do this recovery without 
adding more friction in the form of the needed gear train and added propeller 
blade frictional drag".

If you really want to engage in a discussion that will NEVER end, try to
establish whether added propeller blades increase proulsion performance.

I'll start it out by noting that in the 'old days' (WW II + -) championship
rubber powered model airplanes usually had ONE propeller blade (and a
counterweight).


on you marks -- get set -- GO!
From: kiviat@oasys.dt.navy.mil (Brian Kiviat)
Newsgroups: sci.engr.mech
Subject: Re: Propeller Questions
Date: 5 Oct 92 17:32:29 GMT
Reply-To: kiviat@oasys.dt.navy.mil (Brian Kiviat)
Organization: Carderock Division, NSWC, Bethesda, MD

In sci.engr.mech, campbell@leonardo.src.honeywell.com (Jim Campbell 7644) writes:
>and we found that the most efficient propeller (theoretically) would have only
>one blade in the flow.  However, at the speeds we were running (510 RPM) we nee
>two blades for balance.

Wouldn't one blade have an oscillating eccentric thrust vector? This
would seem to be a problem for stability and fatigue life. Is that the
"balance" you were speaking of?
   O                                     There are two kinds of people:
   I\   Brian Kiviat (301)227-1833              People who Surf
   I \  kiviat@oasys.dt.navy.mil                     and
  /     David Taylor Model Basin                People who don't
   \___________________________
			     \\
Newsgroups: sci.engr.mech
From: campbell@leonardo.src.honeywell.com (Jim Campbell 7644)
Subject: Re: Propeller Questions
Reply-To: campbell@leonardo.src.honeywell.com
Organization: Honeywell Systems and Research Center
Date: Mon, 5 Oct 1992 21:28:34 GMT

In article 25944@oasys.dt.navy.mil, kiviat@oasys.dt.navy.mil (Brian Kiviat) writes:
>In sci.engr.mech, campbell@leonardo.src.honeywell.com (Jim Campbell 7644) writes:
>>and we found that the most efficient propeller (theoretically) would have only
>>one blade in the flow.  However, at the speeds we were running (510 RPM) we nee
>>two blades for balance.
>
>Wouldn't one blade have an oscillating eccentric thrust vector? This
>would seem to be a problem for stability and fatigue life. Is that the
>"balance" you were speaking of?
>   O                                     There are two kinds of people:
>   I\   Brian Kiviat (301)227-1833              People who Surf
>   I \  kiviat@oasys.dt.navy.mil                     and
>  /     David Taylor Model Basin                People who don't
>   \___________________________
>			     \\

Yes, with only one blade, the resultant thrust force (that is to say, if one
were to approximate all thrust as a single force vector) is some distance (not 
necessarily 1/2 of the blade length) from the axis about which the prop is
rotating.  With two blades directly across from each other, the "resultant
thrust force" is very close to the hub of the prop (if the blades always
stay deep enough).  We chose this design because it significantly reduced the
load on the bearings which supported the shaft at the propeller end.

As far as fatigue life was concerned, as we built thinner and thinner propellers,
we found that the blades would deform (elastically) under full power, effectively
changing the pitch enough to make the propeller unusable.  Our props were made
from carbon fiber layups.

JimC

Newsgroups: sci.engr.mech
From: bellg@zeus.swindon.rtsg.mot.com (Graham Bell)
Subject: SDRC Email.
Organization: Motorola LTD
Date: Wed, 30 Sep 1992 07:50:13 GMT

I have been told that we can now Email the SDRC head office in Milford, Ohio.
Does anybody know there email address ?.

 	Thanks

 
-- 
Graham Bell,		Tel No	+44 793 545248
Motorola Ltd,		Fax No	+44 793 541228
16 Euro Way,		E-mail	bellg@zeus.swindon.rtsg.mot.com
Blagrove, Swindon, 		uunet!motcid!zeus!bellg
England, SN5 8YW.
Newsgroups: sci.engr.mech
From: zaval@athena.mit.edu (Antonis)
Subject: Ringless Piston
Organization: Massachusetts Institute of Technology
Date: Thu, 1 Oct 1992 14:35:26 GMT

  I am looking for a ringless (no O-rings) hydraulic piston with
  a diameter of 1"-2" (25-50mm) to be used at pressures of the order of
  50-150 bar. Anybody knows a (US prefferably) source.

  I would appreciate  personal e-mail answers to
  zaval@duvm.ocs.drexel.edu

  Thanks,

  Antonis Zavaliangos

Newsgroups: sci.engr.mech
From: acampane@magnus.acs.ohio-state.edu (Angelo Campanella)
Subject: Ladder Logic- what is it?
Organization: The Ohio State University
Date: Wed, 30 Sep 1992 03:11:49 GMT



              Mark Golberg  asked about ladder logic, and here's my 2 cents:

The logic described by Tom Coradeschi looks like what is called "Boolean
Algebra" in EE circles.  That's the logic that says 1 + 1 = 1,
or yes + yes = yes, but also
   yes + no  = no
   no  + no  = yes,   etc.   this is known as "AND" logic.

Then they talk about NOR and NAND.


Hope this helps
From: bschmidt@maybeck.mti.sgi.com (Bill Schmidt)
Newsgroups: sci.engr.mech
Subject: Re: propeler question
Date: 30 Sep 92 01:04:13 GMT
Reply-To: bschmidt@maybeck.mti.sgi.com (Bill Schmidt)
Organization: sgi

One propeller counteracts the torque produced by the other.  Therefore
the craft will not be a whirling dervish at zero or low speeds.
Newsgroups: sci.engr.mech
From: viviana@igor.tamri.com (Vivian Aldridge)
Subject: Setting description standards for electro-mech components
Organization: TOSHIBA America MRI, South San Francisco, CA
Date: Thu, 1 Oct 92 19:04:41 GMT

Has anyone worked on setting description standards for
electro-mechanical components at their company?
(If this is not the right news group for this question
could you suggest another?)

We are setting a description standard for CONNECTORS
in our computer database. The idea is to allow engineers
to quickly search and locate connectors already available
in our part numbering scheme.

For example, if an engineer needed a 9 PIN DSUB CONNECTOR
that could be panel mounted, they would use the standard at
the end of this article
to search for the part in the computer. By using the standard
the engineer would type "CONN,DSUB,9 POS"  The computer would
then provide a list of all the descriptions beginning with those 
first four words followed by more details and then the
company part number.

Our computer can not search by one keyword that might appear
anywhere on line. It can only search in the order one types the
words.

The following is a proposed standard for connectors. By the way the
standard wraps around to a lower line. Also, underneath the
descriptors I have provided examples.

CONN,    <type>    ,<no. of   ,  <config>,<descrip>,<sex>,<type of cbl used>,
		     contacts>
      ADAPTOR(ADPTR)              RT ANG    RGXX      F        RND
      BNC                         STRGT     SHIELD    M        FLT
      CIRC			  PNL MNT   W/O MTG   JACK		
      CPLG                        PCB MNT   W/ RLF    PIN 
      DSUB 					      PLUG	
      FIBER OPTIC(F-O)				      RECPT	
      FITTING(FTG)				      SKT 
      HEADER(HDR)
      JACKSCREW(JKSCR)
      MS-TYPE
      N-TYPE 
      S-MINI
      SMA
      SMB

	<material>,    <color>,   <size>  

         ALUM                      5/8 HUB 
	 NON-MAG
	 PLASTIC
         STEEL


1. What do you think of the order of the descriptors?
   OK? Not OK? What order would you search by? Perhaps "no.
   of contacts" should precede "type"??

2. If you had the choice what descriptors (name at least
   three) that you think are NOT necessary i.e color.

3. Should the number of contacts in the connector be
   described as "POS" or "COND"  or "CONT"?

4. Under each descriptor I included examples. Please include
   more examples if any more come to mind. If you think any
   of my examples are under the wrong heading please let me know.

I know I have a lot of questions and you have limited time,
but I would happy to receive any kind of suggestions.

Thank-you for your advice,
Vivian

viviana@tamri.com
From: daver@sunspot.ssl.berkeley.edu (David Ray)
Newsgroups: sci.engr.mech
Subject: Re: autocad news group
Date: 30 Sep 1992 21:12:59 GMT
Organization: /etc/organization
NNTP-Posting-Host: sunspot.ssl.berkeley.edu

We don't get alt.cad.autocad. No wonder I didn't hear about it. Too bad.
We do get alt.cad, though. Maybe thats a good a place as any to start.
-Dave
From: berg@malice.cass.usu.edu (Glenn Berg)
Newsgroups: sci.engr.mech
Subject: Re: Ladder Logic- what is it?
Date: 30 Sep 92 13:05:01 GMT
Organization: The Center for Atmospheric and Space Science, Logan, UT
In-reply-to: acampane@magnus.acs.ohio-state.edu's message of Wed, 30 Sep 1992 03:11:49 GMTLines: 60

In article <1992Sep30.031149.8597@magnus.acs.ohio-state.edu> acampane@magnus.acs.ohio-state.edu (Angelo Campanella) writes:

> The logic described by Tom Coradeschi looks like what is called "Boolean
> Algebra" in EE circles.  That's the logic that says 1 + 1 = 1,
> or yes + yes = yes, but also
>    yes + no  = no
>    no  + no  = yes,   etc.   this is known as "AND" logic.
> 

This is not an AND operation; it is the NOT of the EXCLUSIVE OR.  The
AND operation is analagous to multiplication:

Y = AB

and has the truth table

A B | Y
-------
0 0 | 0
0 1 | 0
1 0 | 0
1 1 | 1

The OR operation is analagous to addition:

Y = A + B

having the truth table

A B | Y
-------
0 0 | 0
0 1 | 1
1 0 | 1
1 1 | 1

The NOT operation is a logic negation and changes a 0 to a 1 and a 1 to a
0, such that
 _
AA = 0


The "ladder logic" described above can then be implemented as:
         __
Y = AB + AB     (that's each factor NOTTED and then ANDED in the second term)

giving the truth table

A B | Y
-------
0 0 | 1
0 1 | 0
1 0 | 0
1 1 | 1

--
Glenn A. Berg (berg@logan.cass.usu.edu)
Center for Atmospheric and Space Sciences, Utah State University

"We've got one more hill to take... Capitol Hill!" - Lt. Col. James "Bo" Gritz
Newsgroups: sci.engr.mech
From: shawkenw@cc.curtin.edu.au
Subject: Modelling A Sphere
Organization: Curtin University of Technology
Date: Tue, 29 Sep 1992 04:40:52 GMT


I am currently undertaking an honours thesis for the school of Computer
Systems engineering in which part of the problem involves modelling a
ball on a surface.  My knowledge on DYNAMICS is limited.  I need to know
whether:
	Will I need to use a rigid body in 3D or is there an easier
	 way.  Having problems with the axis of rotation changing.
	 A good book which does not drown in MATH.  ie EXAMPLES
	
	Could I use a particle model with fudge factors if the ball was
	 small.
From: bluelobster+@CMU.EDU (David O Hunt)
Newsgroups: sci.engr.mech
Subject: Re: Commercial Finite Element Packages
Date: 29 Sep 92 14:00:43 GMT
Article-I.D.: andrew.kemB8=y00YV9485mMc
	<1992Sep29.185924.17684@kocrsv01.delcoelect.com>
Organization: Carnegie Mellon, Pittsburgh, PA

>You may be right about this. However, engineers in my group seem to prefer
>ABAQUS over NASTRAN, but this could be due to our application environment.
>-- 
>Pardeep K. Bhatti                         pkbhatti@kopth004.delcoelect.com

I've used those two (and ANSYS) in industry (plastics, mostly).  ABAQUS is
better than ANSYS, though I've heard that ANSYS has improved greatly lately.

And NASTRAN sucks...IMHO.




David Hunt - Graduate Slave |     My mind is my own.      | Towards both a
Mechanical Engineering      | So are my ideas & opinions. | Palestinian and
Carnegie Mellon University  | <<<Use Golden Rule v2.0>>>  | Jewish homeland!
====T=H=E=R=E===I=S===N=O===G=O=D=========T=H=E=R=E===I=S===N=O===G=O=D=====
Email:  bluelobster+@cmu.edu    Working towards my "Piled Higher and Deeper"

"Out there is a fortune waiting to be had; do you think I'd let it go you're
mad - you got another think coming!" -- Judas Priest
From: v126nlbt@ubvmsd.cc.buffalo.edu (ZAC)
Newsgroups: sci.engr.mech
Subject: autocad news group
Date: 27 Sep 92 15:18:00 GMT
Organization: University at Buffalo
News-Software: VAX/VMS VNEWS 1.41



	We recently purchased autocad and I am starting to familiarize myself
with its many features. If there is an autocad newsgroup could someone please
tell me its name. I can't seem to find it.
	Thankyou



						ZAC
From: pfoss@cmsa.gmr.com (Pete Foss PO/46)
Newsgroups: sci.engr.mech
Subject: Re: propeler question
Date: 30 Sep 92 11:18:35 GMT
Reply-To: pfoss@cmsa.gmr.com
Organization: .................


In article 864@mala.bc.ca, princecr@mala.bc.ca () writes:
>
>	I saw a show on Tesla the other day and there was this rather crafty 
>vertical take-off and landing plane thing.  It was developed by the US military
>after Tesla's pivoting cockpit design.  Now, this thing had two props together 
>on the same shaft.  My question is what is the purpose of these two props
>inline with each other and how do they work??
>						chris.


The props probably rotate in opposite directions.  A single prop plane will tend to
rotate in the direction opposite to the prop.  I've seen films of a plane called a
POGO designed by Convair (I think) that was a delta wing, twin counterrotating props,
vertical take off.  It was extremely difficult to control during transition to/from
level flight to hover and during hover.
From: pkbhatti@kopth004.delcoelect.com (Pardeep K. Bhatti)
Newsgroups: sci.engr.mech
Subject: Re: Commercial Finite Element Packages
Date: 29 Sep 92 18:59:24 GMT
Article-I.D.: kocrsv01.1992Sep29.185924.17684
Organization: Delco Electronics Corp.

In article <80720@ut-emx.uucp> pushkar@bongo.cc.utexas.edu (pushkar tamhane) writes:
>
>I posted this query two days ago and the response has been lukewarm. However most
>(almost 95%) of the responses were from academic institutions. I would like to hear more 
>from the users in the industry.

Here is one response from industry.

We have both MSC/NASTRAN and ABAQUS. We use NASTRAN primarily for static
analyses, and ABAQUS for nonlinear and dynamic analyses.

ABAQUS, in general, has better nonlinear analysis capabilities (nonlinear
material properties, gap and contact elements, automatic time-stepping,
etc.) It has an extensive material library (plasticity, creep, temperature
effects, etc.) It also has several different types of multi-point
constraints, which we find very useful.

NASTRAN, on the other hand, is more efficient at normal mode analysis (with
availability of several different algorithms).

>On our Campus, we had a choice of using ABAQUS and MSC/NASTRAN. But MSC/NASTRAN was
>removed due to low usage. It seems industry is more fond of this package. 

You may be right about this. However, engineers in my group seem to prefer
ABAQUS over NASTRAN, but this could be due to our application environment.
-- 
Pardeep K. Bhatti                         pkbhatti@kopth004.delcoelect.com
Powertrain Engineering Analysis
Delco Electronics Corporation
GM Hughes Electronics
Newsgroups: sci.engr.mech
From: bellg@zeus.swindon.rtsg.mot.com (Graham Bell)
Subject: Re: autocad news group
Organization: Motorola LTD
Date: Wed, 30 Sep 1992 07:03:03 GMT

	It would be nice to have an ME cad newsgroup, not only to discuss 
autocad but all areas of computer aided design (design, analysis, simulation etc.).

At the company where I work we use both Cadds 4X, Ideas, and various CFD packages

Although Autocad may be the most widely used cad software it's not the only one!


-- 
Graham Bell,		Tel No	+44 793 545248
Motorola Ltd,		Fax No	+44 793 541228
16 Euro Way,		E-mail	bellg@zeus.swindon.rtsg.mot.com
Blagrove, Swindon, 		uunet!motcid!zeus!bellg
England, SN5 8YW.
From: jrtz@stat1.bst.rochester.edu (John Ritz)
Newsgroups: sci.engr.mech
Subject: Examples of Statistical Experim. Designs ?? Anyone ?
Date: 6 Oct 92 03:08:37 GMT
Organization: University of Rochester - Rochester, New York


	I would be interested in seeing some explicit examples
 	of people using Statistical Experimental Designs : 
	One - and Two - way ANOVA , Randomized Block , 
	Mixed effets , Latin Squares , Factorial etc. , 
	in this area of science. If you have any , please 
	email me at jrtz@stat1.bst.rochester.edu . You 
	can give a reference to a Journaltogether with 
	volume , no. and pagenr. ( e.g. Technometrics , vol.11 ,     
	no.1 .. ) .

	Thx !
Newsgroups: sci.engr.mech
From: cjs1722@zeus.tamu.edu (STEPANIAN, CHRISTOPHER JOHN)
Subject: Low Velocity Props
News-Software: VAX/VMS VNEWS 1.41    
Organization: Texas A&M University, Academic Computing Services
Date: Sat, 3 Oct 1992 00:41:00 GMT

What is the best source of prop designs available. The propeller is to be
used in a human powered submarine. The previous design utilized a counter-
rotating setup with TUGBOAT style props (read designed for extreme low end
power). What the undergrads are looking to do is get a design more condusive
for approx. 10 mph. 

I am looking for a source of design data - they have to figure out the
Reynolds numbers, desired regime, etc... and use the source. When MIT did
the prop designs for the gossamer(sp?) vehicles (Albatros, Condor), what
did they use? Has NASA done something for this un-aerospacelike regime?

What are your thoughts? Any help would be appreciated! 

PLEASE REPLY BY E-MAIL! If significant replies are received, I will repost!

Thanks in advance,

Chris Stepanian				Composites are the future,
Department of Ocean Engineering           learn 'em!!
Texas A&M University                          -unknown
From: geversti@oasys.dt.navy.mil (Gordon Everstine)
Newsgroups: sci.engr.mech
Subject: Re: bandwidth/profile reduction
Date: 30 Sep 92 17:13:32 GMT
Reply-To: geversti@oasys.dt.navy.mil (Gordon Everstine)
Organization: David Taylor Model Basin, Bethesda, Md.

In sci.engr.mech, dscott@ccu.umanitoba.ca (Doug Scott) writes:
>Is anyone out there doing any studies in bandwidth/profile reductions?
>Anyone have Everstines test problems?

I probably have them.
From: nagle@netcom.com (John Nagle)
Newsgroups: sci.engr.mech
Subject: Re: Simple Machines
Date: 27 Sep 92 16:48:46 GMT
Organization: Netcom - Online Communication Services  (408 241-9760 guest)

sspatter@netcom.com (Samuel Scott Patterson) writes:
>     Just an odd thought...  In most high-school text books, they
>talk about the 6 simple machines, Wheel, Wedge, Lever, Inclined Plane,
>Pulley, etc...  

      Some people claim the rolamite is a simple machine, but interest
in the rolamite has waned in the last two decades.  Some seat belt
tensioners have them, but not much else.

					John Nagle
Newsgroups: sci.engr.mech