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Author Topic: How to unstick something thats been screwed on tight ?  (Read 25352 times)
clockwork creation
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« on: August 06, 2009, 05:40:39 pm »

While attempting to replicate the porkshanks headphone mod I ran into a problem. I cannot unscrew the Bakelite ear cup from its metal holder.

It seems to be jammed shut and will not budge at all   Sad


how can I unstick it without damaging the Bakelite ? 


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Athena
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« Reply #1 on: August 06, 2009, 05:43:10 pm »

Liquid soap maybe?
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clockwork creation
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« Reply #2 on: August 06, 2009, 05:51:43 pm »

I just tried that. No effect unfortunately  Sad
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Athena
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« Reply #3 on: August 06, 2009, 05:55:03 pm »

Oil? Butter? There might be something at a local hardware store, like WD40.
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JingleJoe
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« Reply #4 on: August 06, 2009, 05:58:52 pm »

The screws are probably jammed up with rust and oxidization from over the years, I would advise WD-40 but if you want to preserve the speakers inside be very careful and only use a tiny amount at a time Smiley
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clockwork creation
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« Reply #5 on: August 06, 2009, 06:02:49 pm »

Would a little caustic soda damage the bakelite ?
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sidecar_jon
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« Reply #6 on: August 06, 2009, 07:26:31 pm »

oh my old bike techniques. Easing oil (might damage the bakalite) shock ( sharp tap with a small hammer, needn't be all that hard ) and heat (expands the item and breaks the seal)
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JingleJoe
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« Reply #7 on: August 06, 2009, 07:49:57 pm »

Would a little caustic soda damage the bakelite ?

I'd be more concerned about the metal parts being aluminium

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Can you try it on an area that wouldn't notice? I can say with almost complete certainty that WD-40 would not damage either the metal or the bakelite.
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jringling
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« Reply #8 on: August 06, 2009, 08:13:38 pm »

Instead of WD40, find a true penetrating oil... here in the states we have Kroil or PB Cutter... Thy to find a non-aerosol oil and use sparingly
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Glass
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« Reply #9 on: August 06, 2009, 10:36:37 pm »

Don't get impatient with the penetrating oil. It takes time to.. uhh.. penetrate.
 Smiley

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« Reply #10 on: August 06, 2009, 11:19:19 pm »

Put them in the freezer for a couple of hours, then warm the bakelite cups with a hair drier slightly, and turn. You might need to do that a couple of times.
I think he broke his hair dryer... Grin
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Athena
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« Reply #11 on: August 06, 2009, 11:23:30 pm »

Y'know he's probably already got them loose by now...
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clockwork creation
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« Reply #12 on: August 06, 2009, 11:43:31 pm »

Would a little caustic soda damage the bakelite ?

I'd be more concerned about the metal parts being aluminium
http://www.youtube.com/watch?v=Y7FmrOatEEA
Shocked

Can you try it on an area that wouldn't notice? I can say with almost complete certainty that WD-40 would not damage either the metal or the bakelite.




nickel plated brass I believe they are made of.. well i shall strip the nickel when im done.


Put them in the freezer for a couple of hours, then warm the bakelite cups with a hair drier slightly, and turn. You might need to do that a couple of times.

I think he broke his hair dryer... Grin



this is true



and they are still stuck solid  Sad
« Last Edit: August 06, 2009, 11:54:44 pm by clockwork creation » Logged
Kittybriton
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« Reply #13 on: August 07, 2009, 12:27:32 am »

Would a little caustic soda damage the bakelite ?

I'd be more concerned about the metal parts being aluminium
http://www.youtube.com/watch?v=Y7FmrOatEEA
Shocked

Can you try it on an area that wouldn't notice? I can say with almost complete certainty that WD-40 would not damage either the metal or the bakelite.


Well, even if the bakelite won't let go, now I have an alternative to the bunsen burner with no gas supply Grin
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clockwork creation
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« Reply #14 on: August 07, 2009, 12:43:27 am »

Tomorrow I shall add some WD40, tap it, heat it and then pray  Smiley
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sidecar_jon
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« Reply #15 on: August 07, 2009, 12:50:53 pm »

place a screw driver in the slot and tap that, just a little. I once saw a guy dismantle a tractor engine that was just a mass of rust, tap tap tap , little easing oil,,, tap tap tap more oil... etc...too patience and i must admit i would have ruined the parts with mole grips and too much force!
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sidecar_jon
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« Reply #16 on: August 07, 2009, 12:52:10 pm »

if the threads are ruined you can remake them in milliput (epoxy putty) though i suspect they might be threaded brass inserts that take the screw...
« Last Edit: August 07, 2009, 02:48:02 pm by sidecar_jon » Logged
jringling
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« Reply #17 on: August 07, 2009, 01:28:03 pm »

be very very very careful when tapping bakelite....
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Angus A Fitziron
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« Reply #18 on: August 07, 2009, 11:30:23 pm »

When I was a lad ... I worked for British Teslacom and became very familiar with this strange phenomena. Time and alcohol have reduced my faculty to remember just what we used to do to remove the caps, but a firm grip and alternately applying pressure in a clockwise, then anti-clockwise direction, repeated enthusiastically may well have caused the cap to give. It seems to be a function of Bakelite and on telephones (300 series) both parts of the thread, the cap and the body were Bakelite and frequently jammed. Keys were supplied to give a grip, but usually the technique was to bang the handset against the customer's antique sideboard, whereupon the cap gave in. However, as JR says be very careful if you haven't got a green Morris Minor van full of spares outside! In the repeater station, the bodies of headphones were nickle plated and the whole assembly much lighter, so much less satisfactory to bang about. I do not recall there being any magic lubricant or application of thermal processes that were used. Try alternating twisting force and you may be lucky (or I may have completely made all this up ~ it was over 40 years ago ...)
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« Reply #19 on: August 07, 2009, 11:40:42 pm »

That sounds like some good information right there Smiley I will keep the clockwise/anti-clockwise turning in mind for when I happen upon a jammed screw thread next Smiley
it was over 40 years ago
Oh great wise elders, please continue to enlighten us with your bountiful knowledge Grin
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Nikola Tesla
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« Reply #20 on: August 08, 2009, 01:07:03 am »

One of the chemistry tricks is to run hot water over the offending item.  On the other hand, with chemistry jars the metal threaded part is nearly always on the outside, which means the metal expanding slightly faster than the glass loosens it.  Looks like here you have the Bakelite on the outside and the metal on the inside.  Maybe that freezer/hair dryer idea?  Someone around you has to have a hair dryer, if yours isn't working.

(Come to think of it, I don't own one either, and I can think of several circumstances like this where one would come in handy).

I'm going to remember that clockwise/counterclockwise thing though.
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« Reply #21 on: August 11, 2009, 09:50:07 pm »

Today I had some devilishly stuck screws to deal with, solultion: Drill them out! Grin
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Sir Nikolas of Vendigroth
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« Reply #22 on: August 11, 2009, 10:52:22 pm »

Today I had some devilishly stuck screws to deal with, solultion: Drill them out! Grin

But you're a northerner!  Lips sealed

Your solution should be " 'it it wit' 'ammer"!
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JingleJoe
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« Reply #23 on: August 11, 2009, 10:57:52 pm »

Today I had some devilishly stuck screws to deal with, solultion: Drill them out! Grin

But you're a northerner!  Lips sealed

Your solution should be " 'it it wit' 'ammer"!
Tried that but it didnt work  Undecided
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clockwork creation
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« Reply #24 on: August 20, 2009, 02:24:48 pm »

Any luck with the cap yet?


None at all, in the end i bought some different headphones  Undecided
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