Amazing work David....You make metal casting seem so easy, when really it's very hard to get it right!, especially the mold making process when it comes to removing the patten from the sand!....I'm so glad it all worked out for you and you've made that large casting for your new engine *cool*
You should try making a bell. I noticed your metal had a ring to it. I make them out in the back yard and sale one every once in awhile. I make swingable dinner bells that mounts on a post.I spray them flat black.
The stainless steel "crucible" in this pour is about 5 1/2 dia 6" tall. I am now using graphite crucibles and an A7 is the largest that will fit the furnace.
@EmperorAst I don't think it would be possible with just the pattern using greensand. The pattern would need to be hollow in the circular section and the moulding sand would not release from it by simplly lifting off the cope. It took quite a lot of rapping to realese the pattern as it was. video is editted!
I wish there were someone like you close by: I have a project that I think is no more difficult than what your videos have shown, but I don't have the courage to attempt it alone...
@fly2000jtb This an Olds. search "Gearless Olds close up."and you will see one complete.All the sand is reuseable.i dont bother with the core sand though. Part 17 comming to a PC near you soon!
The lettering on this one just show my name and year and were done by sticking Dymo tape to the pattern. Video 8 shows some lettering done with cardboard. I also have some plastic foundry letters.
Excellent videos! I'm so trying this at home! If I were to make a copy of a part by using the part itself to make the moulds and core, will the copy be smaller than the master? Might not be a big problem for small parts, but on big parts this may certainly matter? Thanks
I see you using baby powder, but have you ever coated your molds with wax, or any type of mold release agent? I have seen this done with molds for making composite items.
Another fascinating video! At 13:56, just after page turn transition, lettering can been seen on the bottom of the casting. Do you show how to add lettering in any of your videos? If not, please explain. Thanks for your fine efforts! RL
That was a big pour :) Nice learning every time..Myfordboy do you have share's in Johnson baby powder Might be some thing worth investing in..ahhaha !Great work and skill's..
Hiya, first of all great video's. I'm currently watching my way through the whole playlist. Thanks fgor this, very informative. :D I have a question if you wouldn't mind answering... Why does the core need a vent or in the previous videos, multiple vents?
Hello again, I noticed your core stayed intact on this one as opposed to the other than turned back into sand.... Have you ever thought about making a more durable mould to make more than one part? Looks like with this core, a little more bonding agent (whatever you used) would make this one reuseable. I haven't even done my first cast yet and I have someone inquiring about casting for them, and paying me for it lol....but they want a nicer finish. I did some research and found that there is a mould coating that you can spray on, that provides a really REALLY smooth (almost shiny) finish....it's called Boron Nitrate.....Have you heard of it/Tried it?
michael C The core has to be made of sand so it can be broken and removed. Use Petrobond sand to get a smoother finish. Don't know about the BN you mention.
I figured that about the core, but also thought with the bottom vent, and a mould release agent, you might be able to make a reuseable mould....and if you'd tried it. Petrobond, is that an oil based product as opposed to water/bentonite? I haven't even poured my first cast yet so I'm probably WAY ahead of myself lol...but I'm planning ahead. I have constructed a reil burner but needed a high pressure regulator, that arrives wednesday, made some better crucibles, AND got my hands on about 50 old dead computer hard drives. They are all disassembled now and separated into pure aluminum, interior discs, and parts that have other metals attached to them..... The way I figure it, with the precision needed in a hard drive, it has GOT to be pretty good aluminum. I was amazed to see that the platters themselves are aluminum. I have read they are coated in an alloy but they are HEAVY. I've got almost 2 kg of these discs. Can't wait to melt them to see how much pure aluminum comes off them.
michael C Petrobond is oil bonded sand video here ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE--XJNeQ_U-RQ.html Forget the idea of a reusuable mould. Good luck with your first casting. It takes practice to get good results.
myfordboy you're right, you do get a really smooth finish with the petrobond....looked nice even with the wire brush cleanup... You're also correct about making castings, I have NO doubt that my first 10 will look like lumps of dog poo lol.....that's why I'm going to start with simple shapes, like rounds, squares, and stuff like that. I make small wooden 33 ford toy cars about 3" long, 1 1/2" high 1" thick...VERY simple....going to make that like attempt 5 or 6....I also make 67 mustangs, they are like 8" long 4" wide and 2" high...that will be attempt 20....
