Hi Luckygen1; I'm just new to the party but can't thank you enough for producing such a fine tutorial on core making. Having come across your video has changed my whole approach to what seemed an impossibility. Bonzer! Happy New Year from the UK.
luckygen1001, Hands down you have the most informative videos on the subject of metal casting and mold making I have found on the web. I hope you as proud of them as you are your castings. Thank you for your time and knowledge.
Really enjoy your videos used to work in a small foundry right out of high school enjoyed every thing but the heat sometimes on Saturdays on overtime the boss would have a few of us to come in and make what they called pep set cores the sand would have a chemical bonding agent mixed with it and we would only have a few minutes to pack the core box they were large cores probably 200 or 300 lbs I remember the core sand would get hot as it set up the foundry is still in business today
It would have been more clear if you showed the finished product in the beginning. Not being a mold maker I thought the fiberglass shape was looking like the finished product. Very interesting.
Just when I needed this tutorial. Casting a machine vice and I needed a good way to make a reliable core box from a plug mould. Is that just straight plaster of Paris or? Thanks again for the great video
Excellent video Did you use silver sand for the core sand! I take it the core only starts to burn when the cast iron has solidified and is it the sand in the core that retards the glass fibre resin within the core, from burning to early!! Regards
very helpful. i'm about to make my first core. did you lubricate inside the molds before putting the core mix in? i've made a core mold from PLA (3d printed) and i'm a little concerned it may stick in there) cheers o/
@@luckygen1001 thanks for the reply. I tried a bit of WD40 wiped on the PLA as i wasnt sure. It seemed to work (re sticking). but my Core was still a little soft. i'm not sure i made the mix strong enough I'll try without the WD40 next time. cheers
G'day luckygen Thank you for sharing your knowledge. First at the end what have you used to build up your crucible? And secondly could you please explain the purpose of it. Thanks again mate.
@@luckygen1001 Thank you lucky for replying and thank you for that information. I followed to a link you put up for a German crucible maker very interesting. I'm almost at the point where I'm armed and dangerous and ready to learn by my mistakes. Thanks again for everything. Derek.
Hi Luckygen, I found this very useful because I've had trouble getting sodium silicate bonded cores out of the castings. I would like to try your bonding method. Was that polyester resin or epoxy resin that you used please?
I use epoxy resin. I had the same problem with sodium silicate so I started looking for substitutes. You can mix some molasses to make the sodium silicate break down post casting. The most common mistake people make is using too much sodium silicate and that is why the cores are hard to remove. What metal are you casting?
Did you sort the problem out John ? I'm having the same trouble ?? Sodium silicate to hard to get out of my bronze, same consistency as hard sandstone.
im trying to make some aswell how do you make your core for the sliding jaw what shape do you make do you have any pic or videos off ur patten and or your core box
Hi Luckygen1; I'm just new to the party but can't thank you enough for producing such a fine tutorial on core making. Having come across your video has changed my whole approach to what seemed an impossibility. Bonzer! Happy New Year from the UK.
You do not have to use expensive resins to make a core mold, plaster is good enough and that is why I made the video.
Wow! you have every reason to be proud of your workmanship there! Nice video , excellent casting. thanks for sharing!
luckygen1001, Hands down you have the most informative videos on the subject of metal casting and mold making I have found on the web. I hope you as proud of them as you are your castings. Thank you for your time and knowledge.
Great tutorial, a very professional presentation. Thank you.
Fantastic video. You have given me a lot of ideas of how to make more complex molds and forms. Thank you for sharing your expertise with us.
Fantastic, great attention to detail and straight to the point!
God bless you
Keep the good work
Awesome. One of the best videos I've ever seen.
A lot very good information really fast and with great ease and confidence
sand is way better than using clay & reusable, great tutorial, thank you
Really enjoy your videos used to work in a small foundry right out of high school enjoyed every thing but the heat sometimes on Saturdays on overtime the boss would have a few of us to come in and make what they called pep set cores the sand would have a chemical bonding agent mixed with it and we would only have a few minutes to pack the core box they were large cores probably 200 or 300 lbs I remember the core sand would get hot as it set up the foundry is still in business today
It would have been more clear if you showed the finished product in the beginning. Not being a mold maker I thought the fiberglass shape was looking like the finished product. Very interesting.
how you make the core sand ( the mix) and how long does it take to harden?
Very nicely done. I am going to have to try this.
Don't know what you were making, but that was a beautiful cast piece. Well done
It was a part for a Stanley steamer.
Hello, what type of cast iron can I use for press???

Just when I needed this tutorial. Casting a machine vice and I needed a good way to make a reliable core box from a plug mould. Is that just straight plaster of Paris or? Thanks again for the great video
Yes it is.
Excellent video
Did you use silver sand for the core sand!
I take it the core only starts to burn when the cast iron has solidified and
is it the sand in the core that retards the glass fibre resin within the core, from burning to early!!
Regards
I have a project with a complex core. It will be cast of aluminum. How much shrinkage do you have to take into account when you make the pattern?
+gulf4yankee 3 to 5mm per 300mm.
+luckygen1001 Thanks for the response!
What sand did you use for the core mixed with the resin?
Any sand can be used as long as it is clean.
very helpful. i'm about to make my first core. did you lubricate inside the molds before putting the core mix in? i've made a core mold from PLA (3d printed) and i'm a little concerned it may stick in there) cheers o/
I am not sure if a core mix will stick to PLA. My core mix does not stick to my plaster core boxes.
@@luckygen1001 thanks for the reply. I tried a bit of WD40 wiped on the PLA as i wasnt sure. It seemed to work (re sticking). but my Core was still a little soft. i'm not sure i made the mix strong enough I'll try without the WD40 next time. cheers
What lubricant did you use to stop the 2 plaster blocks from sticking together? Pete
Peter Angel I use a light oil, engine oil could be used.
Would fiberglass resin hold up on a larger core about 3' long
Depends on how thick the core is.
Thanks for the post! very informative!
G'day luckygen Thank you for sharing your knowledge. First at the end what have you used to build up your crucible? And secondly could you please explain the purpose of it. Thanks again mate.
They are called pedestals and are made from the same material crucibles are made from. It's purpose is to keep the crucible higher in the furnace.
@@luckygen1001 Thank you lucky for replying and thank you for that information. I followed to a link you put up for a German crucible maker very interesting. I'm almost at the point where I'm armed and dangerous and ready to learn by my mistakes. Thanks again for everything. Derek.
G'day again Lucky I meant to ask what are you using to hold them all together. Thanks Derek.
Hi Luckygen, I found this very useful because I've had trouble getting sodium silicate bonded cores out of the castings. I would like to try your bonding method. Was that polyester resin or epoxy resin that you used please?
I use epoxy resin. I had the same problem with sodium silicate so I started looking for substitutes. You can mix some molasses to make the sodium silicate break down post casting. The most common mistake people make is using too much sodium silicate and that is why the cores are hard to remove. What metal are you casting?
Thank you, the ones I had trouble with were some bronze cylinder castings. It took forever to get the cores out. I had to chip them out bit by bit!
Did you sort the problem out John ? I'm having the same trouble ?? Sodium silicate to hard to get out of my bronze, same consistency as hard sandstone.
Great video! What specific type of resin system are you using for your core sand binder?
Epoxy resin.
@@luckygen1001
Sounds good. Most of the epoxy resins I'm looking at say full cure in 72 hrs. Is there a faster system that you're using?
Just apply gentle heat for two hours and it is ready to use.
super cool greeting from nepal
its really good ...
But didnt it get too thin?
do you make your clamps we see in all your videos holding your molds together
Yes I do.
im trying to make some aswell how do you make your core for the sliding jaw what shape do you make do you have any pic or videos off ur patten and or your core box
The core is a simple rectangle shape so the backbone fits in the hole.
do you use the same size core for the top and bottom castings
Yes.
Simply best
very interesting
you mix sand with epoxy resign and hardener. that is the key...you should better show how in more detail.
nandrie(thankyou)