Pages: 1 2 [3]   Go Down

Author Topic: Lead Solder  (Read 1184 times)

VE7RF

  • Member
  • Posts: 1609
Re: Lead Solder
« Reply #30 on: July 18, 2021, 06:16:12 PM »

In Australia we need instructions to open a wine bottle;



But there are no instructions for replacing the cap and my liver is is a bad way.  :)

Don't laugh.  I used to teach a night school course on CW  vs CCW.   "which way is clockwise they all squeal".
 " how do I shut it off? "

My older (69)  sister routinely cross threads everything...since she was a kid.   Still does...including toothpaste, you name it.
Logged

G3EDM

  • Member
  • Posts: 1456
Re: Lead Solder
« Reply #31 on: July 18, 2021, 10:48:23 PM »

I just realised it's not all that logical.

To turn on a radio that has knobs "volume control" style: CW.

To screw in or tighten a screw/bolt: CW.

To turn on a ring on my electric cooker: CCW, and with heat increasing in CCW direction.

To "turn on" (open) a tap/faucet: CCW (logical result of the "normal" screw direction in the mechanism).

We do this without thinking. But there must be boundary conditions where people get confused about which direction. We've probably all known people who are frequently confused on this one.

Edited to add: If you think about the world in engineering terms and visualise the internals of the devices you are using, you know the rotation direction intuitively. But if you are just thinking about the function of a control or object, the rotation direction is not necessarily logical.

Plus, you do occasionally come across deliberate use of a "reverse thread" because of sound engineering reasons.

In radio there are interesting applications of rotation direction. The J.W. Millen knobs on my homebrew receiver were manufactured with the numerals 1 to 10 engraved on the dial. They were sold both with 180 degrees, and 270 degrees, of rotation (typically the first one for variable capacitors, and the second one for potentiometers). They were available in two configurations: numbers increasing CW, and numbers increasing CCW. Because these knobs are now very rare, my radio actually has both CW and CCW knobs on controls right next to each other, one of which turns in the "wrong" direction if you pay attention to the numbers on the dial. I don't care because I never look at the numbers.... I have a search set up on eBay for the "right" dial but it hasn't been successful for the past 8 years or so.

73 de Martin, G3EDM
« Last Edit: July 18, 2021, 11:04:29 PM by G3EDM »
Logged

G3RZP

  • Member
  • Posts: 2254
Re: Lead Solder
« Reply #32 on: July 19, 2021, 02:20:31 AM »

Sometimes it really is crazy. A class of steam locomotives on one British railway around the early 1900s were required to exchange the tenders  with  another class that needed a larger coal and water capacity. The water scoop (for picking up water at speed over track pans) on the 'new' tenders had an opposite thread....The natural result was that in several  cases, the fireman forgot, and instead of winding the scoop up, wound it down further. Come a board walk (ties laid parallel to the rails between the tracks to allow barrows and trollies to cross) and  a tie would get scooped up , and the scoop rapidly removed!

You can get left hand taps and dies fairly easily in the UK. It was an old trick in a factory where they used both  was to send the apprentice to stores for a left-handed hand die holder!
Logged

K6BSU

  • Member
  • Posts: 313
Re: Lead Solder
« Reply #33 on: July 20, 2021, 04:10:25 PM »

In spite of my massive education, I still get trapped.

I had to repair a desk fan.  Now, the fan blade rotates CW, facing the unit.  The big plastic knob that holds the fan blade onto the motor shaft has a left-handed thread.  That is logical, now that I think of it. If it were right-handed, the fan blade would tend to loosen the knob.

Of course, I couldn't get that knob to move, even with pliers (horror!)_    After completely stripping the threads out of the plastic, I realized my mistake.
Logged

KM1H

  • Member
  • Posts: 11155
Re: Lead Solder
« Reply #34 on: July 20, 2021, 04:21:01 PM »

My first wrong way threads experience was on a 52 Plymouth. MOPAR did it that way into the 60's or so
Logged

KX4OM

  • Posts: 533
    • HomeURL
Re: Lead Solder
« Reply #35 on: July 20, 2021, 05:50:47 PM »

One day on the boat, underway and submerged, the starboard turbine generator lost steam. The engineering officer of the watch said on the 2MC, "Engine room upper level, shut down and secure the starboard turbine generator." The upper level watchstander, one of the most experienced guys we had, acknowledged the order and proceeded to trip the port turbine generator. Loss of all AC power. Not a good thing. The engineering watch supervisor ran back and said, "Jeezze George, Port Left, Starboard right!" The response was, "It guess that depends on which way you are facing, Chief."

We put laminated green 'Starboard' and red 'Port', laminated engraved plastic labels on the controls. When we got back to the tender, during an inspection, the Commodore ordered them taken off. "Not on ships' plans!"

Ted, KX4OM
« Last Edit: July 20, 2021, 06:06:56 PM by KX4OM »
Logged

VE7RF

  • Member
  • Posts: 1609
Re: Lead Solder
« Reply #36 on: July 23, 2021, 06:16:44 AM »

My first wrong way threads experience was on a 52 Plymouth. MOPAR did it that way into the 60's or so

My  dad's  1967  dodge dart with the slant 6,  had rvs threads on the lugnuts on the  drivers side.  All  mopar products were like that, and I think into the early 70's as well.  I know folks who replaced the studs with 'normal' threads...on the driver's  side.   Mopar may have meant well,  but no, lug nuts on the driver's  side don't have a tendency to loosen.

I lube all my threads with never seize. Some of the screaming matches I have gotten into with  tire shops, ford dealers  etc, is just un-real.   No, the wheels  don't fall off when  never seize is used.  The added bonus is u don't require as much  tq  either,  same deal as  astm  construction bolts  etc.   You are not after tq.  You are trying to mash  2 x surfaces together.   You can see the difference in required tq  on astm, etc rating, when looking at  'wet'...and  'dry'  tq specs.   The 'wet' is typ 60% of the 'dry'  tq  spec.
Logged

K4KYV

  • Member
  • Posts: 130
Re: Lead Solder
« Reply #37 on: August 12, 2021, 01:57:15 PM »

When I was a kid, before I got my Novice ticket, I dabbled in electronics (mostly parted out old broadcast radios for parts). I had an obnoxious neighbour kid down the road who several times a week would come by for a visit.  I didn't have the option of kicking him out or being rude or mean to him, since  his mother and my mother were co-workers and best friends.  One of his most annoying habits was to pick up the spool of  solder from my workbench, bite off a small piece and chew on it.

Finally I got my revenge and stopped the habit once and for all. I found a small spool of acid core solder and laid it out on the bench where my regular roll was usually placed.  Next time he came by, as usual he picked up my solder and bit off a piece, but this time he immediately spit it out.  I told him it was a new brand of solder I was using because it worked so  much better than my old. 

He never again attempted to chew on my solder, even after I put the rosin core back in place.
Logged
Pages: 1 2 [3]   Go Up