{"id":29144,"date":"2026-05-06T08:02:18","date_gmt":"2026-05-06T06:02:18","guid":{"rendered":"https:\/\/www.lampert.info\/?post_type=tutorial&p=29144"},"modified":"2026-05-08T10:33:15","modified_gmt":"2026-05-08T08:33:15","slug":"jewelry-centrifugal-casting-of-a-ring-with-the-fusion","status":"publish","type":"tutorial","link":"https:\/\/www.lampert.info\/en\/tutorials\/jewelry-centrifugal-casting-of-a-ring-with-the-fusion\/","title":{"rendered":"Jewelry – Centrifugal casting of a ring with the FUSION"},"content":{"rendered":"\t\t
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Professional ring casting with the FUSION casting centrifuge<\/h1>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Ring casting is one of the fundamental techniques of jewelry making – and with the FUSION casting centrifuge, it can be implemented for the first time on a compact tabletop device in professional quality and without sprues. This tutorial guides goldsmiths, silversmiths and ambitious beginners step by step through the complete casting process: from preparation to the actual casting in gold and silver alloys. Please also take the time to read the  FUSION operating instructions<\/a> in detail.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Put on personal protective equipment<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Your personal safety comes first: wear suitable protective gloves, safety goggles and, if possible, an apron made of leather or other heat-resistant material. Wear long-sleeved, non-flammable clothing. <\/p>

Please refer to the operating instructions for complete safety instructions. <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

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Pre-treat the mold with release agent<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Treat the mold<\/a> and all parts that may come into contact with molten metal, 
first with a suitable release agent, e.g. with HeBoCoat\u00ae SL-E 200<\/a> from company Henze <\/a>, 
spray 3MTM<\/sup> Bornitrid EP (formerly EKamold\u00ae EP) or with a comparable product. <\/p>\n

The soot from a candle or an oil lamp can also achieve the same effect so that the ring can be easily removed from the mold after casting.<\/p>\n

At the same time, the mold absorbs less energy from the melt.<\/p>\n

After three to four casting processes, the mold should be carefully cleaned (e.g. in an ultrasonic device or with a brass brush) and the coating reapplied.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

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Prepare the correct amount of material<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Do not use too much (max. 15 grams) and not too little alloy – 
Our practical FUSION alloy calculator<\/b> will help you. You can find it below:  
www.lampert.info\/en\/fusion<\/a><\/p>\n

If possible or available, add a portion of fresh alloy – this improves the melting and flow behavior.<\/p>\n

Avoid extreme combinations, e.g. very thin material combined with a very wide ring rail. A square cross-section will flow out better than an extremely flat one. <\/p>\n

Three different mold diameters are available, 24 mm, 21 mm and 18 mm. This corresponds to the outer diameter of the ring after casting.  <\/p>\n

The FUSION may only be used for casting gold and silver alloys!<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

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Ensure shielding gas supply<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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If argon 4.6 is available to you (see also video“Initial setup”<\/a>), activate the shielding gas supply in the FUSION.<\/p>

Especially if only alloy that has already been cast (e.g. old jewelry) is to be used, this can have a positive effect on the quality of the casting.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

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Preselect the desired rotation speed<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Switch on the FUSION and select the speed depending on the alloy and material quantity. With a little experience, you will intuitively find the right speed for your casting task. <\/p>

A speed of approx. 1200 to 1800 rpm is often sufficient, even if the FUSION can deliver up to 3000 rpm. <\/p>

Wait a few seconds until the FUSION has reached the selected speed. <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

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Melt with a propane-oxygen mixture if possible<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Only with propane-oxygen can the necessary melting temperatures of gold and silver alloys, which can be in the range of approx. 1200 \u00b0C, be achieved quickly and easily. <\/p>

Pour the desired amount of alloy into the crucible. Old alloys or jewelry should be cleaned before melting down.<\/p>

When melting, slightly exceed the actual melting temperature, as the mold is not preheated. However, avoid overheating the melt, which could lead to porosity. <\/p>

Pouring with a flame requires appropriate training, sensitivity and experience.
Practice makes perfect!<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

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Casting a ring blank<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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As soon as the alloy is completely melted, has a shiny surface and moves smoothly under the flame, pour<\/a> the metal calmly, with even movementand without interruption into the center of the sprue hopper. <\/p>

As soon as the melt has been poured, the rotation of the mold can be stopped.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

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Allow the ring blank to cool<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Extinguish the flame, close all gas cylinder valves and switch off the FUSION.
Allow all components and the FUSION to cool down for at least 5 minutes, preferably longer.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

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\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\"Lampert\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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Remove ring blank<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Once all components have cooled down sufficiently, remove the mold housing (wearing leather gloves if necessary), open the mold cover and remove the mold. <\/p>

The ring can now be removed from the mold. <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

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Recoat the mold<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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After three to four casting processes, the mold should be carefully cleaned (e.g. in an ultrasonic device or with a brass brush) and the coating should be reapplied with release agent as described above.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

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Further information on the Lampert FUSION can be found on the product website<\/a> or on our YouTube channel<\/a>.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"featured_media":0,"parent":0,"menu_order":0,"template":"","class_list":["post-29144","tutorial","type-tutorial","status-publish","hentry"],"acf":[],"yoast_head":"\nJewelry - Centrifugal casting of a ring with the FUSION - Lampert Precision Welding<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.lampert.info\/en\/tutorials\/jewelry-centrifugal-casting-of-a-ring-with-the-fusion\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Jewelry - Centrifugal casting of a ring with the FUSION - Lampert Precision Welding\" \/>\n<meta property=\"og:description\" content=\"Professional ring casting with the FUSION casting centrifuge Ring casting is one of the fundamental techniques of jewelry making – and with the FUSION casting centrifuge, it can be implemented […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.lampert.info\/en\/tutorials\/jewelry-centrifugal-casting-of-a-ring-with-the-fusion\/\" \/>\n<meta property=\"og:site_name\" content=\"Lampert Precision Welding\" \/>\n<meta property=\"article:modified_time\" content=\"2026-05-08T08:33:15+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.lampert.info\/wp-content\/uploads\/2023\/06\/lampert_wig-handschuh_gloves.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"973\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.lampert.info\\\/en\\\/tutorials\\\/jewelry-centrifugal-casting-of-a-ring-with-the-fusion\\\/\",\"url\":\"https:\\\/\\\/www.lampert.info\\\/en\\\/tutorials\\\/jewelry-centrifugal-casting-of-a-ring-with-the-fusion\\\/\",\"name\":\"Jewelry - 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