Metal Casting at Home Part 5 Backyard Foundry Core Making

Making sand cores as used in Metal casting at Home part 1 and 4

Category:

Howto & Style

Tags:

• Greensand
• furnace
• pattern
• model
• engineer
• homeshop
• crafts
• arts
• how-to
• how
• to
• diy
• mould
• mold

[valic000]

Keep on watching your foundry episodes....cant watch enough..its great done and explained very wel.even metric sizes..thats a great help.I just only like to know why your sand is dark,almost black.I see different clips,and the collours was brighter (some peopel use also "petrobound",..mix with motoroil &sand with fine grinded catlitter).Is it because its recycled many times? Its darken always some parts?.

Some casting sand use charcoal,but not for alloy castings...Thanks for help! Peter

[myfordboy]

@valic000 Sand is a foundry product, water bonded greensand. It was dark brown and has darkened with use.

[mastekop]

please let me know wallpaper paste, is a kind of glue for wallpaper? do i replace it with any kind of glue from cornstarch or other? or with quickbound? linseed oil, do i replace with other oil such as vegetable oil for cooking? or motorcycle oil or wate vegetable oil?

[myfordboy]

@mastekop I know my recipy works but cannot suggest alternative ingredients if mine are not available. Cores can be made using just sodium Silicate and sand also. I show this on another video.

[fly2000jtb]

Sorry meant to ask you what is sharp sand? Here in the U.S.A. we have play ground (sand box sand) in 50 pound bags, would that work? Joseph T fly2000jtb

[myfordboy]

@fly2000jtb Sharp sand is mixed with cement for bricklaying and rendering. It is a bit coarser than play sand would be so holds together better. I have tried finer sand but it gives a weaker core.

[jeff7037]

Does ur wife blame u to to the core into oven it's dirty?

Haha

It's very good for knowing how to do.

[myfordboy]

@azuranti We have had a new oven since this was taken and Mrs myfordboy isn't so keen to let me use it now!

[Supermassively]

@thishasgottobecrazy This is what I was wondering... how the core can make a uniform tube in the final piece if the core has to rest on the bottom half of the mold, therefore making the hollow center off-set.

[fly2000jtb]

@Gregkret cool we have home depots here in Pa he is in U.K. and some of the things he uses we have here. instead of the salt and washing powder I sent for sodium silicate, and soda ash, which he said would be better. even though it is not home materials, it is what they use in foundry casts. thanks for the home depot idea!! I got playground sand from Ace but it is real fine, we mean really fine. Joseph T fly2000jtb

[Gregkret]

@fly2000jtb If you go to Home Depot in the cement section, they have quartz sand which is a sharp sand. Beach sand is not sharp, as it is windblown and the grains get rounded off and the grains are usually too small. Foundry sand from a foundry supplier is designed to stand up to any metal being cast, the black sand he is using will stand up to Iron, which is super hot. Just about any sand will work with aluminum. Play sand is usually full of rocks and very fine sand, giving a bad finish.

[KGURRUTBER]

I have used 1 part linseed to 50 parts sand and baked them in the oven before. Come out hard as a rock. BUT, you being married, I would suggest you get your OWN oven in the shop. LOL Extremely educational. I try to learn something new everyday. Now the dilemna is WHAT TO MAKE! Keep up the good work.