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An engineering challenge for you

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An engineering challenge for you

Old 24th May 2020, 15:16
  #61 (permalink)  
 
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Originally Posted by EEngr View Post
For aluminum barrel, aluminum end cap flashlights: When I buy one new, I apply a thin film of 'Ox Guard' to the threads. Intended for aluminum wiring to aluminum lugs in panelboards, it keeps the threads from galling. It also improves conductivity. Needless to say, once the batteries leak and corrode, it is often the end of the appliance anyway. I've opened flashlights where the batteries swelling made it impossible to extract them.
Anti seize compound also works, the same stuff you (of course) apply to spark plug threads prior to installation in an aluminum (yes, Yank spelling) head.
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Old 24th May 2020, 15:59
  #62 (permalink)  
 
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As I don't want Ox Guard for anything else, is wd40 and/or regular bike oil a reasonable substitute?
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Old 25th May 2020, 12:20
  #63 (permalink)  
 
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Have we really had 4 pages about getting the cap off a torch, albeit with diversions en route?
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Old 25th May 2020, 12:33
  #64 (permalink)  
 
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Yes, and we failed...
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Old 25th May 2020, 13:23
  #65 (permalink)  
 
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Would have been a success though if we got to the stage of using dynamite.
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Old 25th May 2020, 14:04
  #66 (permalink)  
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Originally Posted by Mr Optimistic View Post
Have we really had 4 pages about getting the cap off a torch, albeit with diversions en route?
You say that as if it was a bad thing.....
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Old 25th May 2020, 14:17
  #67 (permalink)  
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If only it had been more illuminating...
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Old 25th May 2020, 17:12
  #68 (permalink)  
 
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We didn't make light work of it.
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Old 25th May 2020, 21:46
  #69 (permalink)  
 
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That caps it.

The torch was screwed.
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Old 27th May 2020, 01:56
  #70 (permalink)  
 
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Originally Posted by Ancient Observer View Post
As I don't want Ox Guard for anything else, is wd40 and/or regular bike oil a reasonable substitute?
Probably better than nothing. But these oils are pretty thin and not as long lasting as Ox Guard or automotive anti seize that Winemaker mentioned. The principle lubricant there is graphite plus some formulas of suspended metals (zinc, copper) that interact with the alumin(i)um to prevent galling and bonding between surfaces. Automotive anti seize is something that most people who replace the occasional spark plug or bolt in an alumin(i)um engine block would do well to acquire.
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Old 27th May 2020, 03:03
  #71 (permalink)  
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What about teflon tape applied to the threads before you screw it up?

Might make it easier to undo later.

And keep the batteries next to the light device.

Better to have the flashlight carry a torch for the batteries from a distance rather than inside where they can turn rotten and break its heart.
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Old 27th May 2020, 17:55
  #72 (permalink)  
 
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Originally Posted by double_barrel View Post
You say that as if it was a bad thing.....
Nah, just passing by. An observation. Did anybody suggest mole grips?
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Old 28th May 2020, 00:55
  #73 (permalink)  
 
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Originally Posted by visibility3miles View Post
What about teflon tape applied to the threads before you screw it up?

Might make it easier to undo later.

And keep the batteries next to the light device.

Better to have the flashlight carry a torch for the batteries from a distance rather than inside where they can turn rotten and break its heart.
Teflon tape might insulate the cap. On many flashlights the cap is part of the circuit.

"screw it up" reminded of a classic example of why translations are best done by a native speaker of target language, not by slang dictionary:
On assembly instructions for a toy: Take cross tool and f**k the bolt tightly


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Old 28th May 2020, 05:11
  #74 (permalink)  
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Well, "screw it up" as I intended was a double entendre, if you catch if you catch my drift, given the premise of this thread.

i.e., mission not accomplished. (No offense.)

Hadn't thought about the teflon tape interfering with the electric circuit.

Good point, thank you.
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Old 28th May 2020, 09:05
  #75 (permalink)  
 
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When I restored my old Mini Maglite, (post #24), the penetrating fluid I used to get the end cap off migrated throughout the torch and took the silvering off the reflector.

So I would be very wary about using an oil in the end cap thread. Also the thread of the end cap is part of the electrical circuit, so anything you put on the threads needs to be electrically conductive.
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Old 28th May 2020, 10:00
  #76 (permalink)  
 
Join Date: Aug 2019
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Sometimes it's best just to admit defeat. Centre battery (had to be, didn't it) corroded in my "D" cell Maglite. Tried everything, penetrating oil, steam cleaner, sharp drift hammered round edge of battery, drilled out centre of offending cell, no luck. Resorted to brass drift and lump hammer, still didn't shift it. Considering making boring bit that just fits inside tube, but is it worth the effort?
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