Manufacturing has become relatively easy these days CAD 3D printers CNC etc. . In lieu o've such conditions , suppliers have become very selective as who will get the traditional manufacturing product for a satisfactory and standard application result . The reason that many small jewelers are finding with pits in the raw castings are a result from excessive Zinc ( Lead ) in all metal including alloys . Along with inferior investment powders being sold , where high content o've silica are found with no properties derived from clay ! Silica , while very resistant to heat , crumbles while the molten metal is poured .
I try to do everything I can to avoid them which includes proper design, proper sprueing (gating), proper investing, and proper burnout. How to deal with them...... fill with metal, whether it is soldering metal into the holes, or laser welding repair. first, evaluate whether the time to fix is worth it, or just recast.
@@DougNapierJewelryMonk thanks for the input Is having 0 porosity pinhole castings even a thing? Can buying expensive machines help consistently achieve 0 porosity/pinholes etc Thanks again
@@hampigh3323 it is more about proper sprueing, design, burnout times, and investment than the expensive machinery. Many of my successful castings have been with an inexpensive vacuum table and a small burnout oven, with torch melted metal.
matt kermani could be small air bubbles in the wax. Is it injection wax? Could be contaminated metal. Overheating metal, as well. I would have to see the piece.
Thanks again!! Your videos answer very specific questions which is great 💜 I followed
You are so welcome Anna. Thanks for following.
Wow. Precise and great tip. Thanks a bunch.
You are welcome. Glad you could find value.
wow didnt think that made a huge deal im going to give this a try thanks bro
Hiram, anything you can do to prevent defects is a plus.
well that explains a lot. the wax trees i was making looked absolutely disgusting 😂😂
Manufacturing has become relatively easy these days CAD 3D printers CNC etc. . In lieu o've such conditions , suppliers have become very selective as who will get the traditional manufacturing product for a satisfactory and standard application result . The reason that many small jewelers are finding with pits in the raw castings are a result from excessive Zinc ( Lead ) in all metal including alloys . Along with inferior investment powders being sold , where high content o've silica are found with no properties derived from clay ! Silica , while very resistant to heat , crumbles while the molten metal is poured .
nice tip. tkss
Great video How would you suggest to deal with porosity and pinholes ?
I try to do everything I can to avoid them which includes proper design, proper sprueing (gating), proper investing, and proper burnout. How to deal with them...... fill with metal, whether it is soldering metal into the holes, or laser welding repair. first, evaluate whether the time to fix is worth it, or just recast.
@@DougNapierJewelryMonk thanks for the input
Is having 0 porosity pinhole castings even a thing? Can buying expensive machines help consistently achieve 0 porosity/pinholes etc
Thanks again
@@hampigh3323 it is more about proper sprueing, design, burnout times, and investment than the expensive machinery. Many of my successful castings have been with an inexpensive vacuum table and a small burnout oven, with torch melted metal.
Thank you
Thank you!😅
You are welcome.
can you please tell .e approx how heavy the sprue is?
Hiiii sir,
how many times should we reuse the sticks in casting
Hello, when you do casting, if there is a lot of small holes on your model surface, what do you think the problem is? Thanks.
matt kermani could be small air bubbles in the wax. Is it injection wax? Could be contaminated metal. Overheating metal, as well. I would have to see the piece.
@@DougNapierJewelryMonk Thanks for your fast response. I believe that I over heated. Thanks again.
Are those multi-religion crucifixes? How interesting.
Gabby, they are crosses with a star of David attached, yes.