Ripled hammered can it be straightened ?

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Ripled hammered can it be straightened ?

Post by The caretaker » Sun Nov 04, 2018 5:50 pm

Found today henry 111 penny nice coin but looks like it has been through rollers or something. It has a ripple look.
Can these ripples be straightened out ? Any advice would be appreciated. Thanks
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Re: Ripled hammered can it be straightened ?

Post by Allectus » Sun Nov 04, 2018 5:57 pm

It should straighten cold.... if it's not brittle.

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Re: Ripled hammered can it be straightened ?

Post by The caretaker » Sun Nov 04, 2018 6:02 pm

How would you do this ? I have never tried before. Would it work in between two bits of wood tightened in a small vice or is this a no no . Thanks
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Re: Ripled hammered can it be straightened ?

Post by Allectus » Sun Nov 04, 2018 6:05 pm

The caretaker wrote:
Sun Nov 04, 2018 6:02 pm
How would you do this ? I have never tried before. Would it work in between two bits of wood tightened in a small vice or is this a no no . Thanks
That should do for a start. I'd then go with improvised wooden drift-like tools. ::g
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Re: Ripled hammered can it be straightened ?

Post by The caretaker » Sun Nov 04, 2018 6:13 pm

Ok. Thanks for your advice ::g
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Re: Ripled hammered can it be straightened ?

Post by Me and my boy » Sun Nov 04, 2018 6:23 pm

The caretaker wrote:
Sun Nov 04, 2018 6:02 pm
How would you do this ? I have never tried before. Would it work in between two bits of wood tightened in a small vice or is this a no no . Thanks
Vice!!!😶Hollie smoke.
I would at least warm it in hot water before. I’ve snapped a few just by touching them.
Tread carefully. There’s some good YouTube vids
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Re: Ripled hammered can it be straightened ?

Post by Steve_T » Sun Nov 04, 2018 6:23 pm

Any like that I normally put it in a few sheets of newspaper between blocks of wood then in the vice

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Re: Ripled hammered can it be straightened ?

Post by Ten pence! » Sun Nov 04, 2018 6:29 pm

Me and my boy wrote:
Sun Nov 04, 2018 6:23 pm
The caretaker wrote:
Sun Nov 04, 2018 6:02 pm
How would you do this ? I have never tried before. Would it work in between two bits of wood tightened in a small vice or is this a no no . Thanks
Vice!!!😶Hollie smoke.
I would at least warm it in hot water before. I’ve snapped a few just by touching them.
Tread carefully. There’s some good YouTube vids
Hot water will do zilch to silver, this metal anneals at more than four times the boiling point of water, the best way to straighten the coin is to place it between two pieces of card, such as you might find on food packaging, put it on a hard flat surface and whack it, with preferably a wooden mallet, the card will prevent the coin being damaged of bruised.

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Re: Ripled hammered can it be straightened ?

Post by thefiggis » Sun Nov 04, 2018 6:32 pm

Second what Allectus and Steve said. It's all a question of judgement, and whereas I used to anneal everything in the straightening process, if the coin's robust enough (no cracks ets) and the bends are minor a wooden block and wooden spoon do the job in no time at all and the patina remains intact.

BUT things can go wrong so it's always a judgement call which only you can make.

Also as stated, hot water will do nothing to soften the metal, so no point.

Best of luck and let us see the result ::g
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Re: Ripled hammered can it be straightened ?

Post by Rayc » Sun Nov 04, 2018 6:37 pm

Having tried the whacking technique and newspaper/wood/vice I'd go for the latter. If you whack it too hard you are in danger of flattening some of the detail.

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Re: Ripled hammered can it be straightened ?

Post by Me and my boy » Sun Nov 04, 2018 7:00 pm

Oh that’s my new straightening regime sorted. I’ve wasted lots of hot water in the past then 😀
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Re: Ripled hammered can it be straightened ?

Post by Ten pence! » Sun Nov 04, 2018 7:09 pm

Rayc wrote:
Sun Nov 04, 2018 6:37 pm
Having tried the whacking technique and newspaper/wood/vice I'd go for the latter. If you whack it too hard you are in danger of flattening some of the detail.
Newspaper!

Way to thin, use card, you'll not flatten any detail that way.

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Re: Ripled hammered can it be straightened ?

Post by thefiggis » Sun Nov 04, 2018 7:13 pm

Me and my boy wrote:
Sun Nov 04, 2018 7:00 pm
Oh that’s my new straightening regime sorted. I’ve wasted lots of hot water in the past then 😀
=))

Silver anneals at 300+C. Water only gets to 100C. ::g
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Re: Ripled hammered can it be straightened ?

Post by Ten pence! » Sun Nov 04, 2018 7:31 pm

Found this cut quarter today, bend on the pointy bit and rippled, Before and after! Shredded Wheat packet cut down to fit, hard garage floor and wooden mallet, sharp whack and hey presto flat coin fragment!

And just to add, don't try this if the coin is cracked, anneal coin first!
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Re: Ripled hammered can it be straightened ?

Post by sweepstick47 » Sun Nov 04, 2018 7:41 pm

I find that coins such as the one shown for de-rippling/straightening, are best rolled on a sheet of plate glass (cushioned by card) using several lengths of dowel increasing in diameter. The more bent the coin, the smaller the dowel required initially. As said common sense prevails ::g Regards ss47
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Re: Ripled hammered can it be straightened ?

Post by frogeye » Sun Nov 04, 2018 8:10 pm

whats wrong with keeping it as found :-/ I would keep it just as it is . The metal has been stretched in parts and even with annealing it would be difficult to get the ripples out. If you try to work it without annealing the metal will be under stress and will have hairline cracks x;

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Re: Ripled hammered can it be straightened ?

Post by Ten pence! » Sun Nov 04, 2018 8:38 pm

I've done dozens and never had a problem, if it's cracked or severely bent then it will need annealing, the one in the op would straighten with no bother.

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Re: Ripled hammered can it be straightened ?

Post by Ten pence! » Sun Nov 04, 2018 9:11 pm

Annealing should be a last resort, heating the silver to a very light red colour will soften the detail of the coin and if it has any significant copper content you'll end up with a pink coin that is hard to re patinate. like this one.........
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Re: Ripled hammered can it be straightened ?

Post by Easylife » Sun Nov 04, 2018 11:19 pm

To me it just really depends on whether the silver is soft or brittle. My first couple I did flatten successfully cold, as they felt quite soft - like you could just bend easily with just your fingers. Others though just sprung back regardless so required annealing. Very low lighting is needed to see the required dull red glow easier and it makes no odds after whether still hot or cold as the metal structure has changed regardless. Rather than take any chances now I just anneal all of the bent or folded silver hammies. The cracked ones get several stages of annealing and straightening - had no failures yet. The trick is to not overheat them. I adopted Sweepstick's great tip of using several different sized wooden rollers it works brilliant and is easier on the metal, I have even used that method on copper sheet items.
That coin would straighten great using rollers after annealing. ::g
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Re: Ripled hammered can it be straightened ?

Post by The caretaker » Mon Nov 05, 2018 11:55 am

Thanks for everyone's advice and comments.
After reading them especially about soft and brittle silver I have decided not to attempt to straighten the coin it is quite thick and brittle looking to other hammered silvers I have found. Thanks again this is a great forum for advice and help. ::g
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Re: Ripled hammered can it be straightened ?

Post by targets » Mon Nov 05, 2018 2:42 pm

after 100s of years in the ground they age harden so the metal can be good or bad depending on your luck .never wack it cold ,,usually needs a heat up over the gas stove first to soften .then really needs pickling in acid to remove fire scale ..as the base metals in the alloy rise to the surface ..after heating
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Re: Ripled hammered can it be straightened ?

Post by Ten pence! » Mon Nov 05, 2018 7:33 pm

targets wrote:
Mon Nov 05, 2018 2:42 pm
after 100s of years in the ground they age harden so the metal can be good or bad depending on your luck .never wack it cold ,,usually needs a heat up over the gas stove first to soften .then really needs pickling in acid to remove fire scale ..as the base metals in the alloy rise to the surface ..after heating
If you flick the red hot* coin into cold water the scale will come off instantly, this will also assist in the annealing process, someone earlier said this will induce stress cracks, it wont.

* Pink hot would be a better description, easy to see in a darkened garage!

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Re: Ripled hammered can it be straightened ?

Post by sweepstick47 » Mon Nov 05, 2018 8:03 pm

Ten pence! wrote:
Sun Nov 04, 2018 9:11 pm
Annealing should be a last resort, heating the silver to a very light red colour will soften the detail of the coin and if it has any significant copper content you'll end up with a pink coin that is hard to re patinate. like this one.........
I expect that one could be justifiably identified as an Edward 'Long Face'. 8-|
An unfortunate result :( ss47
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