This is the first time I've seen this method. Before watching this, I didn't know it was possible to cast something this complex (unless using lost foam or wax). Thanks for sharing.
nicely done. I noticed on your other vid that you poured some very thin castings perfectly, and in this one you pointed out that your metal was hot enough to leak behind the core, which leads me to believe that your melter is working very well. do you measure the temp or just eyeball it?
The chemical binders in the core sand can produce gas, when heated by the molten metal and, if this gas is not vented adequately, the gas may flow into the metal resulting in a gas porosity defect. Malcolm
Working on a similar pattern right now, but for me the hand-formed core between the cope and drag keep sticking to the cope instead of staying on the drag, even when copious amounts of parting are used. I've had to shove the tip of a thin tool under the core from a few sides in places where it won't affect the mold cavity and put a bit of upwards pressure on the core to get it to separate (hopefully without breaking), then I can close the mold back up and roll it over to get the core in place on the drag so I can remove the loose top piece of the pattern. Got any better ideas for ways to do that, or tricks to keep the core from sticking to the cope in the first place?
You need very strong sand and plenty of draft to be able to lift the cope without breaking the green sand core in that video. Can you post some photos of it on the forum?
@@luckygen1001 I actually got it to work already, but thanks. I probably will post some pics there soon. I was able to pry up the core using some thin tools without damaging it anywhere that mattered while it was sitting on the cope. Then when I rolled the mold over again it stayed on the drag as intended.
This is the first time I've seen this method. Before watching this, I didn't know it was possible to cast something this complex (unless using lost foam or wax). Thanks for sharing.
You never cease to amaze!
+creast Is it my green sand that does not obey the law of gravity?
+luckygen1001 Looks like it! I have enough problems 'coping' with 2 flask halves! ;-)
love your work, I wish your videos were longer.
nicely done. I noticed on your other vid that you poured some very thin castings perfectly, and in this one you pointed out that your metal was hot enough to leak behind the core, which leads me to believe that your melter is working very well. do you measure the temp or just eyeball it?
Superb, the old skills are not dead yet!
Did you use a ramping pin to add venting to the sand? You did not show any mould venting
Malcolm
You have to ask yourself how was it done before lost foam or wax was discovered? This is how it was done.
I use water for molding sand and use cement for cores
I never use vents in my cores and when they are machined there is no porosity. When sand has enough porosity vents are a waste of time.
The chemical binders in the core sand can produce gas, when heated by the molten metal and, if this gas is not vented adequately, the gas may flow into the metal resulting in a gas porosity defect.
Malcolm
very nicely done. Is your sand oil or water bound? What do you make your cores out of?
Working on a similar pattern right now, but for me the hand-formed core between the cope and drag keep sticking to the cope instead of staying on the drag, even when copious amounts of parting are used. I've had to shove the tip of a thin tool under the core from a few sides in places where it won't affect the mold cavity and put a bit of upwards pressure on the core to get it to separate (hopefully without breaking), then I can close the mold back up and roll it over to get the core in place on the drag so I can remove the loose top piece of the pattern. Got any better ideas for ways to do that, or tricks to keep the core from sticking to the cope in the first place?
You need very strong sand and plenty of draft to be able to lift the cope without breaking the green sand core in that video. Can you post some photos of it on the forum?
@@luckygen1001 I actually got it to work already, but thanks. I probably will post some pics there soon. I was able to pry up the core using some thin tools without damaging it anywhere that mattered while it was sitting on the cope. Then when I rolled the mold over again it stayed on the drag as intended.
Can I ask why a sand mold needs venting?
What metall is it. I looked too hot for aluminium
Wow, impressive really
Hi, how do you make your green sand?
I agree... Wow!!!
Cast iron.