GNOME.org
 

re: [OT} English usage Re: Jog feature (Was: Zoom Patch)

On the Unimate Robot (circa 1961) and also on many another industrial machine there 
are three  speeds:

1)  RUN: the full production speed in all axes at once.
2) JOG: a fixed fraction (~10%) of run speed, under manual control, in one or more 
     selected directions at a time. (On the Unimate it depended how long your fingers were
     as to how many buttons of the Teach Gun you could push at once while holding down
     both the enable trigger and hovering a spare digit over the E-stop.)
3) CREEP: like jog but at the slowest speed said device will allow.

The  Unimate was wholly digital. It was all hard-wired TTL for control.  It's only analog 
components were the final drive transistors feeding the servovalves themselves.

"Run", "jog" and "creep" were in the common vocabulary long prior to this usage. I expect
they were chosen with respect to relative speeds of locomotion alone and without any
more specific connotation in mind. Subsequent use may have modified them, though, I 
do suppose. 

Gan

-------- Original Message --------

From: "Michael Ross" <michael e ross gmail com>
Sent: Friday, September 05, 2008 8:31 AM
To: "discussions about usage and development of dia" <dia-list gnome org>
Subject: [OT} English usage Re: Jog feature (Was: Zoom Patch)

Jog is incremental, like a single pixel move. Also it means something like

"to take small steps," hence its use as "to run slowly and lightly." In
mechanical practice a jog is not always very smooth or light, it is often an
impluse or step input with all the subsequent sharp accelerations and
deaccelerations.  Not a problem in the digital world where pixel changes
"accelerate" images quite nicely as far as the eye can tell.

Creep is a very slow velocity move under manual comtrol.  Creep has a lot of
technical and colloquial meanings as well.  Such as the the noun creep is
derogatory for a malicious or unsavory person - creep(ing) like and insect
or worm.  It also means to compress under a load with time and elevated
temperature.  All slow continuous motion.  I suppose pressing a cursor arrow
approximates a slow continous motion - the jogger becomes a creeper.

On Fri, Sep 5, 2008 at 6:55 AM, Gan Uesli Starling <gan starling us> wrote:


The speeds "jog" and "creep" were terms embossed into the teach gun of the
world's first line of industrial (hydaulic) robots by Unimation corporation
of Danbury Conneticut back in the 1960's.

The Unimate 4005J, built in the 60s and remanfuactured by Prab Robots
through the 90's is still in commercial use today. Not new ones, mind, but
the originals, continually maintained with replacement parts.

I was an engineer for Prab back in the 90's and I know a guy who still
makes a living supporting old Unimates even now. Those things are beasts,
powerful enough to pick up most modern robots and toss them through a brick
wall. But you do have to be kind of careful when you are anywhere near one.
They don't even have CPU's. The brain is all hard-wired TTL and runs on a
512K clock. Memory is a 2Kx32 ferrite core array. And they STILL work. LOL

Gan

Michael Ross wrote:


Could be an American colloqialism.  To jog is a verb (with no conjugation)
applied to machinery in the industrial rather than digital past.  You might
jog a conveyor belt to get it in just the right position for servicing for
instance.  It is a good analog for what we are talking about, you poke at a
button and you get an incremental action.  In this case we would want
up/down/left/right and the cursor keys are commonly used to implement this.
 I use this in the CAD program I useto move tables, text, and views on a
drawing.  Or in LabVIEW, a graphical programming system, to adjust the
position of controls on the GUI and function icons on the block diagram.
 Jogging ignores any grid or object snapping.

2008/9/4 Christian Ridderstrïm <christian ridderstrom gmail com <mailto:
christian ridderstrom gmail com>>

   On Wed, 3 Sep 2008, James McDonald wrote:

            Absolutmente. Jogging is an excellent feature when it is
           present.


               Somewhat related, I think it'd be great if it was
           possible to use
               the arrow keys to move selected objects (in tiny steps).


       If you implement a jogging feature, it would be great if it
       had a preference to make a jog = 1 pix, mm, cm, pt etc.


   Is it called jog feature in general? (I haven't heard this name
   before).

   I agree that the amount should be configurable. And if snap to
   grid is on, that should work as well.

   Maybe this should be added as a feature request?

   regards,
   /Christian

   --    Christian Ridderstrïm, +46-8-768 39 44
http://www.md.kth.se/~chr <http://www.md.kth.se/%7Echr> <
http://www.md.kth.se/%7Echr>
   _______________________________________________
   dia-list mailing list
   dia-list gnome org <mailto:dia-list gnome org>
   http://mail.gnome.org/mailman/listinfo/dia-list
   FAQ at http://live.gnome.org/Dia/Faq
   Main page at http://live.gnome.org/Dia





--
Michael Ross
=================================
Cycling in Central North Carolina
Schwinn Voyageur 11.8
Linear LWB, Greenspeed GTO, BikeE CT, AT
------------------------------------------------------------------------

_______________________________________________
dia-list mailing list
dia-list gnome org
http://mail.gnome.org/mailman/listinfo/dia-list
FAQ at http://live.gnome.org/Dia/Faq
Main page at http://live.gnome.org/Dia







_______________________________________________
dia-list mailing list
dia-list gnome org
http://mail.gnome.org/mailman/listinfo/dia-list
FAQ at http://live.gnome.org/Dia/Faq
Main page at http://live.gnome.org/Dia





-- 
Michael Ross
=================================
Cycling in Central North Carolina
Schwinn Voyageur 11.8
Linear LWB, Greenspeed GTO, BikeE CT, AT
_______________________________________________

dia-list mailing list
dia-list gnome org
http://mail.gnome.org/mailman/listinfo/dia-list
FAQ at http://live.gnome.org/Dia/Faq
Main page at http://live.gnome.org/Dia
[Date Prev][Date Next]   [Thread Prev][Thread Next]   [Thread Index] [Date Index] [Author Index]