|
Posted by James Waldby on May 11, 2008, 6:04 pm
Please log in for more thread options
On Sun, 11 May 2008 21:52:34 +0000, Leo Lichtman wrote:
> "James Waldby" wrote: [re cell-phone pictures]
It probably already is fixed focus (clip)
> ^^^^^^^^^^^^^^^^^^^
> So, the opposite of fixed focus is broke focus?
No, they're not opposites; in cameras with lenses, fixed
focus is broke focus. Called "focus free" as if it's a
good thing on really cheap non-adjustable cameras.
-jiw
|
|
Posted by Leo Lichtman on May 11, 2008, 5:48 pm
Please log in for more thread options
"cavelamb himself" wrote: (clip) BTW, running a welder off a coiled power
lead is not advisable. (clip)
^^^^^^^^^^^^^^^^^^^^
If you're worried about inductance, forget it. The current runs both ways
in paired power cable, so the inductance vitrujally cancels. Some people
claim there is a heat dissipation problem--I have never run into this, but I
suppose if you wound the line tightly and had limited cooling air flow it
could lead to some temperature rise. For most home-type welders, the duty
cycle would probably limit the welder more than the cord.
|
|
Posted by dave on May 12, 2008, 1:03 pm
Please log in for more thread options Tom wrote:
>... fit an friction device, if you're worried about
> overrun? One that can be disengaged quickly for rewinding.
hi tom
your idea was actually in my 'initial short list' of methods, but I
ruled it out because I didn't want to fight a 'dragging brake shoe'
while unspooling (in addition to the weight of the cable itself)
thank you tom :-)
- -
you other 'camera' guys:
yeah, sorry about the focus, and the low-qual images. sometimes a
cellphone camera focuses better than others. generally speaking, though,
even under the best circumstances it takes fairly lousy pix...
(need to go buy a batt for my digi-cam)
thanks
|
|
Posted by James Waldby on May 11, 2008, 5:58 pm
Please log in for more thread options On Sun, 11 May 2008 15:04:25 -0400, dave wrote:
> hi guys :-)
>
> I made this wall-mounted heavy-duty parallel-crank (folding) mechanism
> to hold about 50 feet of 6-4 SO-cord (on a big steel reel) to my garage
> wall.
[...]
> the slightly more difficult part of this affair, though, is I'm planning
> to incorporate a totally mechanical Counting Mechanism part - the CM
> part should count the turns of the reel as I unwind the cable (when I'll
> be far from the reel, tugging the 'outlets end' of the SO cord out) and,
> after a certain number of turns 'outfeed', the CM should -stop- the reel
> from turning further. having a WEE bit of trouble simplifying the CM
> part of the deal, though.
[...]
> photos and drawings of what I have so far:
>
> http://machines.50webs.com/folding_reel_mechanism/
>
> ideas on simplification for the counter, and better ideas certainly
> welcome :-)
...
Consider the following instead of a counter -- call your big
drum A. Have 2 little drums, B and C. B is fastened to A and
turns at the same rate. C has a thin cable that winds off of
it on to B as you reel out your electrical cord. If B and C are
1/5 as big as A, put a stop at the 10' mark on the cable, to stop
rotation when about 50' have reeled off of A. Put a motor drive
or a window-shade spring inside C, or set up a counter-weight
system to rewind the little cable during retraction.
-jiw
|
|
Posted by Jim Wilkins on May 11, 2008, 7:53 pm
Please log in for more thread options > Consider the following instead of a counter -- ...
> -jiw
What's wrong with putting a braided-wire strain relief on the inner
end of the cable? Then just pull until it stops.
|
| Similar Threads | Posted | | quick and simple v-belt tensioning, the mechanism/ideas..."trick screws", and shortening springs? | July 13, 2006, 10:28 am |
| kredite oesterreich ratenkredite online billig kredit ohne schufa online kredit im finanzierung kredit zinsen kredite online berechnen dispo kredit kreditvergleich kreditkarte online kredite ohne schufa serioes umschuldung credit ohne schufa kredit tro | November 13, 2008, 4:07 pm |
| Folding light bar for compact tractor | March 21, 2006, 9:44 pm |
| try folding the movement's shy constituency and Angela will construct you | August 12, 2007, 8:02 pm |
| Webcool24.com : Biggest worldwide Asian free Video multi language web , Travel, Sports, Massages techniques, Fashions, Jokes , Top models , Free online IT learning , 5000 links, 250 free online TV , 50000 music video, nice landscapes , Health , Fl | August 14, 2007, 10:17 am |
| kredit selbststaendige in Eberswalde kredit ohne schufa online net girokonto online kredit ohne schufa mit sofort arbeitslos kredite | September 4, 2008, 6:21 am |
| Re: Thwacker needs a mechanism.. | October 8, 2007, 3:32 pm |
| Re: Thwacker needs a mechanism.. | October 8, 2007, 3:34 pm |
| Re: Thwacker needs a mechanism.. | October 10, 2007, 6:43 pm |
| Re: Thwacker needs a mechanism.. | October 14, 2007, 10:15 pm |
|
|
Yahoo! 
Google 
Windows Live 
del.icio.us 
digg 
Netscape 
XML Sitemap