At 4mins40sec what you can do is take some of the dry sand & pour it into the wet cup to soak up the remaining liquid. In other words - "rinse" the cup out with sand and add it back into the main mix.
Matt Moore also co2 is heavier than air so I would recommend getting a end cap drilling a hole inserting the tube or hose and placing it on top of the PVC mold in conjunction with the wire hole down the center. a wire hanger does a great job for that. this will maximize co2 exposure.
Hey Soat Mon, thanks for this info, was looking to buy small cylinders of co2 for core making. you've saved me the expense. Thankyou very much. Shayne--Australia.(new subscriber)
Very good job! I was particularly impressed by your idea of setting the cup of vinegar in the glass. I just dumped the vinegar in on the soda and it bubbled up and went everywhere before I could get the top back on. I’ll do better next time! Thanks 🙏🏼
You use a core to create a hollow place in a casting. I originally was making this core to make a hollow place through the hub of the wheel for the axle. Thank you for watching!
+Michael D Joven The core was actually for the wheel that I used in the muller that I just made. I wound up not using the core because I realized I needed that part of the pattern to hold the wheel while I turned it in the lathe. Hated to waste a good video though. Thank you for watching!
Matt is right, poke a wire or small knitting needle through the core to help the CO2 get into it - this also acts to vent the core during casting. I would also suggest using fairly small marble (limestone) chips (even bits of sea shell) instead of the bycarb as the reaction will be a bit more controllable. CO2 cores are known to be very difficult to remove after casting as the breakdown of them is poor - sometimes you have to get them out with a hammer and chisel! But adding 1/2% glucose powder to the dry sand and mixing it in before directly weighing in the Sodium silicate will solve this - the core will soak/hose out after casting. This addition may make the core slightly weaker so you may need to up the silicate - I tend to use 7.5% but then I do like a strong core!
Watching was my pleasure. I hope that you did not mind my 2 cents worth, its just an expression of my belief that we foundry types should help each other. To be honest I prefer shell cores but one does not always have the luxury of a metal core box to work with so CO2 becomes the next best option. Unfortunately provision of the CO2 is the Achilles heel of the process - I was lucky in being given a full cylinder but for most people the gas represents quite a problem. With what mathematicians would call an "elegant solution" you have solved that problem - your method is simple, effective, and anyone can do it - well done!Incidentally there is some suggestion that CO2 cores are best used a few days at most from making. However I have used some that were several weeks old, but then I am fussy about venting the cores.
Hey Oldfoundaryman and Soat Mon thanks for the information. I like to try this but I just want to be sure I understood everything. 1). These type of cores are soluble with water? 2). The sand is not beach sand but sand you can get at home depot? Or where do you recommend? 3). Oldfoundaryman: Where do you get the glucose powder? I searched and I get on my search some sort of pills!? 4). Oldfoundaryman: Can these cores can be used with molten aluminum at 1700 degrees Thanks for the answers. I'm hoping to try these soon. Jeff
Jeffry, I will leave Soat Mon to answer the first two questions (unless he wants me to answer them) I get the glucose powder from a health food shop.1700 deg. is very hot to be pouring aluminium normally around 1350 deg. would be the go! But they do use these cores with molten iron and that s at about 2500 deg. so it should take 1700 Ok.
thanks for the demo, I tried this a month ago and I'm not sure what I did wrong but, from the looks of it I may have used to much sodium silicate. I bought mine at a ceramics supply so I'm assuming it's the same concentration. I may try this again tonight
+Clarke E Measure it out and you should be fine. This was the first time I've done it but the results were really good. I hope you try it again, good luck!
+Soat Mon thanks, I didn't get a chance to try it last night, still working on some patterns but will try to make some cores before this weekend. I'm curious to try a threaded pattern, I know it would be rough but for this application I think it would be fine for a course thread.
It was interesting to see that baking soda and vinegar generated enough CO2 to harden the sodium silicate; thanks for posting this.
Your welcome!
Funnel, Need to Purchase a 1$ Funnel
Cut the top off of a 2 liter bottle, disposable funnel.
At 4mins40sec what you can do is take some of the dry sand & pour it into the wet cup to soak up the remaining liquid.
In other words - "rinse" the cup out with sand and add it back into the main mix.
+Wayne Royce That's a good idea. Thanks for watching
Good Idea there for a CO2 generator, very good indeed. Am new to your channel, keep up the good work and thank you for sharing.
Punch a stiff wire down through the core sand prior to gassing, and that'll let the CO2 get through the sand easier.
Matt Moore also co2 is heavier than air so I would recommend getting a end cap drilling a hole inserting the tube or hose and placing it on top of the PVC mold in conjunction with the wire hole down the center. a wire hanger does a great job for that. this will maximize co2 exposure.
@@agustinlimon7951 Thanks for this advise.Agustin. Shayne.
Absolutely love this. Although now I feel I have to go learn what the hell a foundry core is!
LOL Thanks!
that was a great idea! thanks for sharing!
Formidable,je n'ai pas perdu mon temps avec cette vidéo. Merci,merci,merci.
Real teacher
And good man
God bless you
Thank you!!
Loved it great info. Thank you
You're welcome!
Nice explanaiton, could you please tell me the kind of sand you used? silica sand?
Tahnks for your idea . It´s very ggod
Hey Soat Mon, thanks for this info, was looking to buy small cylinders of co2 for core making.
you've saved me the expense. Thankyou very much. Shayne--Australia.(new subscriber)
Glad I could help
Very good job!
I was particularly impressed by your idea of setting the cup of vinegar in the glass. I just dumped the vinegar in on the soda and it bubbled up and went everywhere before I could get the top back on. I’ll do better next time! Thanks 🙏🏼
Your welcome! I saw that somewhere... don't remember where.
This is a perfekt waterfilter and air diffuse pipe too 😳 houly Mouly man!
Thanks!
You can use river sand, or any kind of sand?
Pretty much any clean sand.
I enjoy watching your foundry videos, thanks for sharing.
You're welcome, thank you for letting me know you enjoy them!
Hi, just wondering, what is the purpose of the foundry core?
You use a core to create a hollow place in a casting. I originally was making this core to make a hollow place through the hub of the wheel for the axle. Thank you for watching!
Hi! Very good but what is the core for? Looking forward to more. Mike.
+Michael D Joven The core was actually for the wheel that I used in the muller that I just made. I wound up not using the core because I realized I needed that part of the pattern to hold the wheel while I turned it in the lathe. Hated to waste a good video though. Thank you for watching!
great idea! definitely going to try this
Thanks!
Matt is right, poke a wire or small knitting needle through the core to help the CO2 get into it - this also acts to vent the core during casting. I would also suggest using fairly small marble (limestone) chips (even bits of sea shell) instead of the bycarb as the reaction will be a bit more controllable. CO2 cores are known to be very difficult to remove after casting as the breakdown of them is poor - sometimes you have to get them out with a hammer and chisel! But adding 1/2% glucose powder to the dry sand and mixing it in before directly weighing in the Sodium silicate will solve this - the core will soak/hose out after casting. This addition may make the core slightly weaker so you may need to up the silicate - I tend to use 7.5% but then I do like a strong core!
Thanks for the input and thanks for watching!
Watching was my pleasure. I hope that you did not mind my 2 cents worth, its just an expression of my belief that we foundry types should help each other. To be honest I prefer shell cores but one does not always have the luxury of a metal core box to work with so CO2 becomes the next best option. Unfortunately provision of the CO2 is the Achilles heel of the process - I was lucky in being given a full cylinder but for most people the gas represents quite a problem. With what mathematicians would call an "elegant solution" you have solved that problem - your method is simple, effective, and anyone can do it - well done!Incidentally there is some suggestion that CO2 cores are best used a few days at most from making. However I have used some that were several weeks old, but then I am fussy about venting the cores.
Hey Oldfoundaryman and Soat Mon thanks for the information. I like to try this but I just want to be sure I understood everything.
1). These type of cores are soluble with water?
2). The sand is not beach sand but sand you can get at home depot? Or where do you recommend?
3). Oldfoundaryman: Where do you get the glucose powder? I searched and I get on my search some sort of pills!?
4). Oldfoundaryman: Can these cores can be used with molten aluminum at 1700 degrees
Thanks for the answers. I'm hoping to try these soon.
Jeff
Jeffry, I will leave Soat Mon to answer the first two questions (unless he wants me to answer them) I get the glucose powder from a health food shop.1700 deg. is very hot to be pouring aluminium normally around 1350 deg. would be the go! But they do use these cores with molten iron and that s at about 2500 deg. so it should take 1700 Ok.
Thank you Olfoundryman!! I thought I was hitting the wrong searches on the internet because I kept on coming up with health food.
Would that core material be good enough as refractory in a foundry ( for low temp like aluminium? )
No, it breaks down once it gets to that temperature. That's one of the things that makes it a good core material. You can break it out after the pour.
thanks for the demo, I tried this a month ago and I'm not sure what I did wrong but, from the looks of it I may have used to much sodium silicate. I bought mine at a ceramics supply so I'm assuming it's the same concentration. I may try this again tonight
+Clarke E Measure it out and you should be fine. This was the first time I've done it but the results were really good. I hope you try it again, good luck!
+Soat Mon thanks, I didn't get a chance to try it last night, still working on some patterns but will try to make some cores before this weekend. I'm curious to try a threaded pattern, I know it would be rough but for this application I think it would be fine for a course thread.