Metal Casting at Home Part 5 Backyard Foundry Core Making

[@RubSomefastOnIt]

the last step in my home foundry building adventure. thanks for you great video helping bring this great process to people. As a machinist as a profession and a hobby really enjoy the idea of casting at home, not wasting material cutting everything out of billet. (plus the piece of mind that some parts are made from spent beer cans :)

[@howtorepairpendulumclocks]

Totally brilliant. Love the workshop/kitchen interaction... thought it was only me : )

[@EmperorAst]

No CO2 needed! Excellent. Thanks Mr. David. Ast.

[@myfordboy]

Sand is a commercial product. I haven't tried making any but will be having a go later. Watch this space! The cores are supported at the ends by the shapes left in the sand by the pattern. This leaves holes in the end of the casting and is taken into account in the design of the pattern. It usualy becomes a hole or bore in the finished item. In a car engine block for example they are fitted with "core plugs"

[@myfordboy]

Taste good with custard! My wife is an angel !

[@myfordboy]

Sharp sand is sold at a builders supplier here in the UK . Mix with cement to make mortar for brick laying. It is probably called something else where you live. Neat furnace on your video!

[@sketchworm]

I'm subscribed to your channel, myfordboy! Very inspiring work!

[@myfordboy]

@thishasgottobecrazy When a pattern needs a core, extra parts are added called core prints. These leave a shape in the sand to suit the core and the core is supported by impression in the sand. Watch part 4 which is basically a tube shape being cast and note the shape of the pattern compaired with the finished item. The complex cores where made by builing up the shape from several smaller ones as shown at the begining of part 10.

[@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.

[@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.

[@braindead4554]

Exactly the video I was waiting for!!! Thanks!!

[@myfordboy]

The sand for the core is builders sand. Foundry sand is used for the mould. I can't help with a supplier as I'm in the UK. You can use play sand with up to 10% bentonite added.

[@VovkaTop]

прекрасно!!! нет не единого слова,но всё понятно!

[@barumman]

What do they tast like ? :-) Your wife must be a saint to allow such misuse of her kitchen equipment. As usual you make it look easy, very good.

[@radbertgrimmig3979]

This is SO cool.

[@scaledtanker1452]

Very nice Video, some valuable info and thanks for taking the time to share. How do you think it will handle a steel melt, say 1600 degress C. Cheers Jim

[@myfordboy]

Actions speak louder than words. I will always answer any questions.

[@stanleyloynes1031]

I wish I could meet you so you can teach me

[@MengkeLi51]

Very nice video, random question, what are the points to use linseed oil and the paste at the same time. Why don't you just use paste alone?

[@myfordboy]

I am now using Sodium Silicate and Co2 for cores and use some commercial core adhisive form Artisan foundry

[@myfordboy]

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

[@myfordboy]

@DrFrankensteam Quantities are shown on the annotations. Let me know if you can't see it.

[@myfordboy]

I believe the linseed oil acts as a binder. Its not my own recipe I read it somewhere. Works ok so no need to miss it out.

[@anamariaamestica]

Congrats! It's genial! Thanks! :)

[@myfordboy]

I have added the quantities to the video.

[@koepketube]

Have you tried making a mold with the same sand, separated by talc? Seems like it'd be bit faster than wood especially if you needed something quick

[@myfordboy]

I don't see any problem with the core or sand. Getting the metal to that temperature though would require a different type of furnace.

[@MengkeLi51]

In some video made by others, they made the gate system(the pipe where you pure the molten metal) after finishing buliding the cope. However, you bulid the pipe with the cope. By doing so, do you make the process any easier?

[@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

[@blueelectricfusion]

how did you come up with the ratios of the different materials?

[@myfordboy]

Sharp sand has grains of different sizes which help hold it together. I have tried using a finer sand but the strength is lost. Its like making concrete , you need a coarse aggrigate for strength.

[@kendonahue2080]

In my experience as a dirt worker, feature of sharp sand is also broken planes and angles on grains, not rounded as by river washing in nature. Watching sand in moving water in a bowl will show how a sharp sand wants to stay compared to round sand.

[@myfordboy]

By fitting the pipe as I ram up the sand I know exactly where it will come in relation to the pattern. If it is pushed through afterwards on a complicated pattern may not come out in the ideal location.

[@ComelliUK]

VERY NICE WORK. WHO DO U WORK FOR?

[@thishasgottobecrazy]

I have a few questions: 1. How is the core being supported by the mold? Let's say you wanted to make a metal tube, the sand core would then be a cylinder in the middle. Since metal would be represented by empty space in the mold it seems like the core would have to somehow float (if it rested on the bottom that portion of the cylinder would never be filled with metal). 2. I get how you make simple shapes in this video, but the core used in the engine housing was complex. How did you do it?

[@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!

[@MattsMotorz]

I keep trying this method, and the cores keep coming out very crumbly. What am I doing wrong? The paste seems to keep localized in small globs, instead of spreading evenly throughout the sand when I am mixing. Is this correct?

[@myfordboy]

It has to be mixed well. Make sure you add the ingredients in the same order as shown and mix until its a uniform colour with no lumps.

[@DrFrankensteam]

Excellent! I was just wondering today how to make a sand core. Can you give me approximate amounts for the ingredients? Thank you.

[@myfordboy]

Propane gas. You can see the set up at the begining of part 2 video.

[@myfordboy]

Pleased to help. Are you going to give it a try?

[@sdably]

@myfordboy I live in the UK and am interested in casting, could you recommend a supplier(of foundry sand), or do you sell parts to spec. ?

[@myfordboy]

raw ore?

[@myfordboy]

@sdably I have never had to purchase any sand myself. One supplier I know of, Is john winter& co. If you google them you will find them. You can get a free model engineers price list sent.

[@MattsMotorz]

What do you use to glue separate cores together?????

[@myfordboy]

PVA adhesive also known as white glue, school glue, elmers glue.

[@MattsMotorz]

Thank you!

[@MaturePatriot]

My father-in-law was a mason (brick layer, not lodge goer), before WW2. When the supplier only had "manufactured" sand, he would go to a bend in the river and shovel up all the sharp sand he needed, then screen out the pebbles. - Is the CO2/Na2SiO3 method as cheap (inexpensive) as this method, I know it is easier, and faster? Great video.

[@myfordboy]

CO2/Na2SiO3 method would be more expensive as the products have to be bought. With greensand it's just used over and over again. I only use it for cores. Surface finish is better with the greensand.

[@MaturePatriot]

I meant for use in cores.

[@myfordboy]

Sorry I did not check which video you commented on. I used the method shown in this video when i started and used household materials. The new method is better now I have a source of the items but both work.

[@zeoxbg]

I resort to this method, because CO2/Na2SiO3 is way harder to get out of the final casting. It gets veryhard, and if the cavity (formed by the core) is small, it becomes very hard to get rid of the core. The cores made by this method are a lot easier to scrape off. It takes a lot more time in comparison to the liquid glass. But it saves you double or even triple that time, after the casting, when you have to clean the cavities.

[@PanEtRosa]

Have you experimented with non-chemical or bio-degradable adhesives?

[@thisis675]

Can you give more details about the baking of the core?

[@myfordboy]

Have a look at the core making page on my web site myfordboy.blogspot.co.uk/p/core-making.html

[@myfordboy]

Self employed but not in engineering. This is my hobby.

[@myfordboy]

The wallpaper paste is in the form of flakes and need soaking with water to make the adhesive. It would't mix properly if the water were added last.

[@ChristianMRoldan]

hello ! The paste for wallpaper would be vinyl adhesive or vinyl glue, which carpenters use to glue wood ?

[@myfordboy]

PVA is good for both

[@ChristianMRoldan]

Thanks 😊

[@myfordboy]

Correction the wallpaper paste is Solvite flakes mixed with water.

[@josephgauthier5018]

oh, cool :). my dad is an electrician too (but he is not self employed).

[@chaz706]

Forgive me for asking but what's 'Sharp sand'?

[@gayemcphee2150]

What size sieve mesh do you use please?

[@myfordboy]

It's a kitchen sieve, not sure of the mesh. It's not important just filter out the larger particles. I now use a different method of core making kzbin.info/www/bejne/Z3nYqXeMpd6Sn7c

[@gayemcphee2150]

@@myfordboy thahkyou.

[@phillipkrywosa9554]

Another way is to use molasses , mixed in water. Mix into the sand, then bake. Nice smell, like you're baking cookies.

[@myfordboy]

You still need a pattern to make the mould from.

[@wazii6]

were can i find raw ore

[@myfordboy]

@h3Xh3Xh3X sharp sand is sold over here at a builder supplier, add cement and use to make motar for bicklaying. The type of sand for the core is not critical but if its too fine it is no as strong.

[@h3Xh3Xh3X]

What is meant by "sharp sand?" I've seen this term in a book as well, without a proper definition.

[@segoviapatricio]

awesome!

[@josephgauthier5018]

do you mind telling me what your day job is? :)

[@koszuta]

+myfordboy I have to admit for a second I found it strange that your oven only went to 200 F. I know you're in the UK but I just had a mild brain fart haha.

[@myfordboy]

yes it's 200 C not F

[@wazii6]

know tell me hoew to make aluninume skateboard trucks

[@ComelliUK]

cool.

[@kevinhirt]

Subbed

[@2LateIWon]

Why do you not talk? And wlak us through what your doing? Nice video by the way

[@wazii6]

i wana cast metal trucks for ma skateboard

[@myfordboy]

Electrician.

[@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.