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Author Topic: Small engineering job....  (Read 4296 times)

Martin [Admin]

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Small engineering job....
« on: October 09, 2016, 05:35:54 PM »


Afternoon all !
Need a bit of engineering help with this  adjuster lock thingy that fits into a wooden stand.

The outer fitting screws into the wood and the inner screws in / out to lock / release the riser.
They seems to have 'cold welded' themselves together, so now it won't twist even a little bit!

1. Anyone recognize this fitting so as to source a replacement?
2. Anyway to break it free?
3. If I have to Dremel / disk cut the outer fitting off, how do i make a replacement?









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rnli12

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Re: Small engineering job....
« Reply #1 on: October 09, 2016, 05:44:50 PM »

Martin,

Looks like fitting I saw recently on an industrial oven unit.

Try espares.

Regards,

Rich
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Regards,

Rich

Mark T

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Re: Small engineering job....
« Reply #2 on: October 09, 2016, 06:24:35 PM »

Martin heat up the metal wood insert with a pencil blow torch and they will probably come apart.  Replacement inserts are available from B&Q and they can simply be epoxied in, if the hole that it fits in has enlarged
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TailUK

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Re: Small engineering job....
« Reply #3 on: October 09, 2016, 06:24:50 PM »

The outer screw fitting is a standard part that you should be able to find online.  We had a similar problem with fittings like this and found that once they were freed up they could be glued back into the wood and worked OK.  The big trick is to get it apart. I think you're looking at a vice and big pliers type job.  Trap the handle in a vice and get a pair of mole grips on the outer bit  The parts are not old enough to have become cold welded together it's more likely that the outer part is cross threaded. The scientific application of force should solve it.
Watch out for the handle as the outer part is spring loaded and pulls out so you can move it around.
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Re: Small engineering job....
« Reply #4 on: October 09, 2016, 06:26:30 PM »

Hello Martin,

Get them very hot with a hair drier, then place them-- still hot, into some brake fluid, or some release oil.
Leave them in overnight, then twist back and forth till they come undone!.
Old rusty Classic car bits were undone with this !!.

John.  :-))
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Re: Small engineering job....
« Reply #5 on: October 09, 2016, 06:40:37 PM »

Hello Martin,

The problem is caused by the Chrome plating being very thin.
Flakes break off and jam the parts together.
When you get the parts apart, use a thin smear of Grease to stop it happening again.
Work the parts together to get some clearance.

John.
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Martin [Admin]

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Re: Small engineering job....
« Reply #6 on: October 09, 2016, 06:51:25 PM »


Blowtorch was my first thought but the handle is the that type of grainy GRP plastic which melts very suddenly....

Hairdrier and oil, hmmm, that might work!
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Re: Small engineering job....
« Reply #7 on: October 09, 2016, 07:17:04 PM »

 
Well, a few things,...

1. Just tried the pencil blowtorch option,
2. Dripped a few drops of 3in1 oil on it while it was hot,
3. Reheated it in the blowtorch, nearly set fire to the kitchen! Opps!!!
4. Put the fires out, a few twist and turn and the outer came right off!   :-))
5. Thread looks damaged but strangely, as you say JayDee, they screw back together quite easily!?!
6. That "galling" on the thread?
7. "The outer screw fitting is a standard part that you should be able to find online" - what am I looking for?









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dave301bounty

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Re: Small engineering job....
« Reply #8 on: October 09, 2016, 07:25:30 PM »

 :-))
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grendel

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Re: Small engineering job....
« Reply #9 on: October 09, 2016, 07:28:08 PM »

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TailUK

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Re: Small engineering job....
« Reply #10 on: October 09, 2016, 07:34:33 PM »

most wood thread inserts would do the job, I believe even Ikea use them, depends on the thread - these are m6
http://www.ebay.co.uk/itm/like/271481461623?lpid=122&chn=ps&adgroupid=28312585266&rlsatarget=pla-193547804466&adtype=pla&poi=&googleloc=9045057&device=c&campaignid=628893806&crdt=0

That's the kiddie!  If you have them just run a die set up and down the thread to make sure you've got all the junk off them or a stiff wire brushing and a light oil.
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Martin [Admin]

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Re: Small engineering job....
« Reply #11 on: October 09, 2016, 07:41:37 PM »

 
To get the correct thread, surreptitiously, visit Homebase / B&Q and try all the nuts 'til one fits nicely?

( PD, have you got a die set?! )
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Re: Small engineering job....
« Reply #12 on: October 09, 2016, 07:56:13 PM »

Looking at it it'll be 6 mm.  Check the outside diameter with your verniers.  Round that up to the next whole number and that'll be the thread size.
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Crossie

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Re: Small engineering job....
« Reply #13 on: October 09, 2016, 09:13:32 PM »




Martin, I've got some of these in t'Shed, I'll have a look in the morning and can post you one if it's the same size.


                  Trevor
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Re: Small engineering job....
« Reply #14 on: October 09, 2016, 09:28:52 PM »

Old mechanics trick to clean up damaged thread - find a nut of the right size, cut a slot with a hacksaw through one side (down not across),refit the nut and close the slot with mole grips while screwing it down the damaged thread. Repeat several times while slowly increasing pressure on the grips. The slot acts as a thread cutter and cleans up the damage.

Dave.
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Re: Small engineering job....
« Reply #15 on: October 09, 2016, 09:41:58 PM »

Hello,

After years of working on classic cars - - the oldest I worked on was made in 1898 !!!, the best release oil I ever used was home made, 50/50 Brake fluid and Petrol - - to be used COLD !!.
Undoes almost anything, rust, age, or neglect, will cause most aluminium castings to leak !!.

John.  :-))
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Re: Small engineering job....
« Reply #16 on: October 10, 2016, 07:35:26 AM »

Chuck it in a container of diesel and forget for a week.
As good a penetrating oil as any.
There was always a covered bucket of diesel just outside the Engine Room just for this.


Bob

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Crossie

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Re: Small engineering job....
« Reply #17 on: October 10, 2016, 09:10:22 AM »

[quote author=Crossie link=topic=56116.msg582240#msg582240 date=1476044012
Martin, I've got some of these in t'Shed, I'll have a look in the morning and can post you one if it's the same size.
                 Trevor
[/quote]


      I'm afraid that the ones that I have are 8mm x 14mm, obviously no good for your needs!


                  Trevor
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Martin [Admin]

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Re: Small engineering job....
« Reply #18 on: October 10, 2016, 09:50:09 AM »


OK thanks anyway Trevor.   :-))

Could I use 3 or 4 nuts and epoxy them in place?
 
 
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derekwarner

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Re: Small engineering job....
« Reply #19 on: October 10, 2016, 09:55:07 AM »

Martin........these threaded inserts have many uses  %)

The two examples in the horizontal plane are M2, and the singular insert in the vertical plane is M3

Derek
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inertia

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Re: Small engineering job....
« Reply #20 on: October 10, 2016, 11:00:29 AM »

Martin
http://www.ebay.co.uk/itm/like/271481461623?lpid=122&chn=ps&adgroupid=28312585266&rlsatarget=pla-193547804466&adtype=pla&poi=&googleloc=9046399&device=c&campaignid=628893806&crdt=0
or Screwfix charge 2.35 for a 50 pack!
As and when you have the new insert fitted, a smear of Copaslip on the screw thread will prevent it from happening again. It's good stuff - around here they even put it on their chips... O0
DM
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Re: Small engineering job....
« Reply #21 on: October 10, 2016, 11:25:44 AM »


OK thanks anyway Trevor.   :-))

Could I use 3 or 4 nuts and epoxy them in place?
 
 


    As Inertia says these things are readily available from Screwfix @ cheap-as-chips prices, order them online and postie brings to your door so any bodge would be a waste of time in my opinion. Once you've got them you'll find all sorts of uses for them, also the chances of getting three or even two nuts all aligned in a hole without getting epoxy into the threads and gluing the whole lot together and giving you a bigger problem would be less than even <:(


                      Trevor
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