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Title: Roman brooch silver casting Post by: Kent on November 27, 2015, 11:09:18 AM Hi all been a bit cheesed off with the weather as late so decided to have a go at casting one of the roman brooches iv'e found in silver not finished yet but thought i would put picture up.
Title: Re: Roman brooch silver casting Post by: Cymro on November 27, 2015, 11:27:52 AM Nice detail - what are you using for your moulding material?
Title: Re: Roman brooch silver casting Post by: Kent on November 27, 2015, 11:32:58 AM Delft clay
Title: Re: Roman brooch silver casting Post by: Cymro on November 27, 2015, 11:42:53 AM That would explain the good detail! Do you use it like plaster of paris, letting it set?
Title: Re: Roman brooch silver casting Post by: Kent on November 27, 2015, 11:54:29 AM No its like sand with an oil added to it you just compress it in casting rings press the object half way in the material then add the top ring compress take apart remove item put back together then your good to go.
Title: Re: Roman brooch silver casting Post by: Cymro on November 27, 2015, 12:04:24 PM Ahhh . . . I've not come across that, but I do know of oil bonded sand (Petrobond) and the yanks use a home brew called K-bond which uses ingredients I can't get over here (bentonate) Cousin is an industrial chemist and he can't get me any either.
I do my own castings but I use traditional green sand, made with fine silver sand and bentonite clay. I don't need that level of detail, but I've seen oil-bonded sand castings which retain all the details on a coin (as an example . . . ;)) Title: Re: Roman brooch silver casting Post by: Kent on November 27, 2015, 01:50:47 PM Getting better
Title: Re: Roman brooch silver casting Post by: b.buoy on November 27, 2015, 02:15:50 PM Very good Ken.
Are you going to declare it as treasure trove?? Only joking, honest Title: Re: Roman brooch silver casting Post by: Dungbeetle on November 27, 2015, 03:57:05 PM I like it Ken, you're a man of many talents !
Title: Re: Roman brooch silver casting Post by: probono on November 27, 2015, 04:07:51 PM Very nice.
I intend to do something like that when I've finally cleared up the garage, got a decent workbench in there, and something to melt silver in too. I made a few moulds some time back using cuttlefish bones, and even a couple using plaster of paris I made by grinding and heating alabaster you can pick up on Penarth beach. Title: Re: Roman brooch silver casting Post by: sharkey on November 27, 2015, 06:55:53 PM good skills Ken, very nice
Title: Re: Roman brooch silver casting Post by: hotmill on November 27, 2015, 07:18:10 PM Superb Ken!
Title: Re: Roman brooch silver casting Post by: dingdong on November 27, 2015, 08:17:58 PM Well done Ken,who knows what's next !! By Royal appointment perhaps !!LOL👍
Title: Re: Roman brooch silver casting Post by: wagis on November 27, 2015, 10:39:12 PM Nice one Ken will you be making your own hammered coins next lol
Title: Re: Roman brooch silver casting Post by: jayhay69 on November 28, 2015, 12:21:38 PM very nice Ken any chance you could do a video of the process i`d like a go at that mate :)
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