Written by HopeDream » November 22nd, 2011, 11:40 pm:Undercover 999 Is there any reason you're not just finishing your CNC waxes for casting? - (surely all wax melts)? Is cnc very difficult to finish? Could you CNC a castable wax? I'm not sure that making a rubber mold is necessary - you might be doing more work than you have to. (Unless you want to make your fiance 100 rings, all the same.) I can see you're definitely making progress!
Written by Lady_Disdain » November 23rd, 2011, 9:50 pm:It is very interesting to watch your progress! Remember to keep the workshop well ventilated while casting. Have you checked if your fiancee has nickle sensitivity? It is more common than people imagine, which is why nickle white gold is banned in Europe and why nickle was voted Allergen of the Year in 2008 by the American Contact Dermatitis Society.
Written by HopeDream » November 24th, 2011, 9:27 pm:Awesome pics!I was discussing your project with my fiance and he suggested that instead of trying to cut out a positive image of your ring with your CNC machine, you could have it cut out the negative image of your ring, basically have it cut you a ring mold out of metal/heat resistant plastic, and then pour wax into the cut mold to shape the wax - if you had 2 pegs on one side of the mold and holes for the pegs on the other side of the mold it would line it up perfectly. You could even pre-cad the sprue onto the ring, and have it as part of the shape of your mold.
Written by HopeDream » November 24th, 2011, 9:27 pm:The youtube casting prcedure 1-17 clips will give you a good idea of the investing process and brief use of a casting machine - note the heavy use of a vaccuum chamber to eliminate air bubbles : http://www.youtube.com/watch?v=EpHDYpgP9FwThis is also a nice and instructive series of clips on the casting process - I think they use a vaccuum caster: http://www.youtube.com/watch?v=C7lrNBOtgLYFor the casting itself you might want to see if you can use someone else's shop. These set-ups get ridiculously expensive :http://www.master-machines.com/melting_casting_machinery.htm . You could still be doing all the work, I just wouldn't want you to shell out for a set-up you'd only use once (or twice?).
Written by sonnyjane » November 25th, 2011, 11:50 am:Just thought of something - are you taking her ring size into account while doing this project? I only ask because it'd be a shame if you really did every step of this process without help, but then still had to take it into the jeweler to size it properly once you were finished!
Written by HopeDream » November 26th, 2011, 1:08 am:Nice setup!How about a centrifugal caster? http://www.americanjewelrysupply.com/products/casting/centrifugal2.htmlhttp://www.ajstoolsonline.com/mystore/casting-supplies/centrifugal-casting-machine/neycraft-centrifugal-casting-machine.html You wind up the caster and lock the mechanism, You mount the investment flask horozontaly, lined up beside the crucible, heat your metal in the crucilbe with an oxy-acetaline torch, and then when the metal is molten you release the mechanism and the molten metal is spun into the mold.Hopefully heating to the correct temp, and spruing from the band will help you deal with the porosity issues. If you still have issues after you change your technique, you may have to go to a more formal casting apparatus.Make sure you take lots of pictures from your journey and make your fiancee a "how I made your ring" journal/scrapbook - I bet She'll love it and love to show it to friends and family.I'm glad the "ring bite" on your hand is starting to heal.
kt Gold Palladium Silver Copper Zinc Nickel18 75 20 518 75 15 1018 75 10 1518 75 10 10.5 3.5 0.1 0.918 75 6.4 9.9 5.1 3.5 1.118 75 15 3.0 7.014 58.3 20 6 3 114 58.5 5 32.5 20.5 1.410 37.5 52 4.9 4.2 1.4
kt Gold Palladium Silver Copper Zinc Nickel18+ 80 20 10 37.5 12.5 23 27
An alloy of palladium 20 parts, gold 80, is white, hard as steel, unchangeable in the air, and can, like the other alloys of palladium, be used for dental purposes.
Alloys of gold, copper, silver, and palladium have a brownish red color and are as hard as iron. ... The composition used in the Swiss and English watch factories consists of usually of gold 18 parts, copper 13, silver 11, and palladium 8.
kt Gold Palladium Silver Copper Zinc Nickel18 75 24.5 0.514 58.3 ?? ?? ??
Written by Undercover999 » December 2nd, 2011, 8:23 pm:Then the investment is prepped and poured and the whole thing into the vacuum chamber for debubblificatorationing.
Written by Lady_Disdain » December 3rd, 2011, 8:52 am:Is there a reason for you to mix your own alloy instead of buying casting grain? Alloys can be very finicky and minor variations can have a huge impact on casting suitability (such as porosity and doing a good, full pour). If you were going for a traditional alloy such as 18k yellow, green or rose, then it is more straightforward but palladium gold isn't quite as simple. Also, casting is more sensitive than fabricating, where manipulation of the metal will solve a lot of problems.
Written by HopeDream » December 3rd, 2011, 8:17 pm:If you're going to make your own alloy, do you have a carbon stirring rod to mix it with? http://www.fdjtool.com/custom.aspx?id=7
Written by HopeDream » December 3rd, 2011, 8:17 pm:Do you have the capacity to safely maintain the high levels of heat necessary?
Written by HopeDream » December 3rd, 2011, 8:17 pm:Are you going to test it for purity before you cast the ring? (possibly not necesary) Are you going pour it into casting grain before using it? (I'm not sure if this is necessary or not)
Written by HopeDream » December 3rd, 2011, 8:17 pm:Keep in mind that some zinc will burn off during the alloying process: http://www.youtube.com/watch?v=ioLZUbbzncU Do you have proper ventilation (zinc lungs = )? You have to account for that when you measure out your metals. Other alloying metals might do that too.
Written by HopeDream » December 3rd, 2011, 8:17 pm:If your homemade alloy turns out to be brittle, the prongs could crack or snap during the diamond setting process instead of bending nicely like they should - I'm sure you don't want that. I wonder if you could trade your boullion metals to a jeweller in exchange for the casting grain of your choice? It would stil be using the value of your inheritance, but a lot less messy and heat-intensive.Stuller X1 is supposed to be nice http://www.stuller.com/pages/1236, and there are a lot of other different casting alloys out there- including palladium white gold (Which I know you prefer).
Written by HopeDream » December 3rd, 2011, 8:17 pm:I'm sorry I ask tough questions - I really want you to succeed. You're definitely getting much closer to your final cast - the most recent ring looks great!
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