Metal Casting at Home Part 21 Core & Mould Making Casting & Machining

[sprttch]

You seem to know what you are doing :P heheheh Very very very impressive. Cheers from Brazil

[madaboutpix]

i envy your tools as well

[madaboutpix]

you're the man, i applaud your skills!

[TheRealGeriBoss]

Every man's dream to do things like this.

[Osmancique]

thousands of things would go wrong if i tried to do this.

you are very talented good sir.

[gwheyduke]

very nice part. Good video.

[TheElsyd]

Another brilliant video - thanks for sharing. I have watched most if not all your videos and every time I learn something else.

[rEsonansDx]

I want to be an engineeeeer, sooooo freakiiing baaaaad.

[somorastik]

You are very skilled patient and precise. I like that, and I like these videos.

[FireDropTechnologies]

Not a spark ignition engine?

Or you just havent mounted

the ignition components?

hot bulb, plug?

I saw the valve pocket,

it didn't look like it could be a diesel?

[myfordboy]

@FireDropTechnologies This engine has an ignitor ignition.

[robert1352]

I like how you can hear the clock ticking in the back ground :)

[GhostLaughingMan]

do i have to use crow ? :)

[myfordboy]

@GhostLaughingMan Wood pigeon works just as well.

[bx2200]

Great, as always. How do you decide where to put the in-gate and riser relative to the part? In this case, for example, you put the in-gate on an area of the part with a relatively small cross-section.  Why?

[myfordboy]

@bx2200 Its best to feed the casting at the thickest part. This is what I did on this one. At 24:06 you can see where the ingate was. The riser was taken from the top of the casting in a place that will be machined. The Ingate is also in a part that will be machined so no clean up on the finished surface of the item.

[freesailer]

Very interesting and informative, thanks for sharing.

[MilanKarakas]

Very useful video. Thanks for sharing it with us.

[valic000]

I study your clips again with a lot plesure,Its really wel done job. My first procect wil be a smal crankcase of a smal model diesel engine. I only dont know,how to create a text on a for exampel crankcase. How do you do it in the proper way?

. On your lovely hit& miss engine you put also a name on the casting.It looks great....but how? Many thanks for al the great info, you share wth us!

Keep the good work going!

Kind regards Peter,Netherlands

[myfordboy]

@valic000 To create the letters on the casting you just need to add suitable letters to the pattern. I have a few proper plastic foundry letters and numbers but other forms can be used. I have used Dymotape and peal off self adhisive letters. If you look at the Part 8 video I cut out the letters from card. They must be filleted on the edges so there are no undercuts.

[telosfd]

Don't use needles!!!!!! Small size scrwes its better.

[scottiblasto]

I would love to see a video on how to make the actual wooden box for the sand to go in. Anyone know of where to find such a video?

[shortfusedleathernk]

You are a freaking genius !

[marcuslb95]

@myfordboy hvat is the name of the black sand you use as the mould ??

[myfordboy]

@marcuslb95 I don't have a trade name but its a water bonded greensand.

[marcuslb95]

@myfordboy aha, thanks :)

[caemaridwn]

Mutt's nut's as usual keep it up nice workshop by the way.

[bladder1010]

Completely fascinating to watch!

[smackbabie]

Pure visual gold as always, thanks for sharing.

[hamech1]

hello their myfordboy. i'm a mechanical engineering student, and just finished watching the entire 21 videos in a row. i've just realized that there is still so much to learn about casting, far more than i studied so far. you seemed to have mastered the alu sand casting process, and i'll keep checking youre channel for some other videos. keep up the good work, and dont let the love of casting die away from the world.

[JKDangerfield]

What brand/model of milling machine is that you are working on? thanx for your videos!

[myfordboy]

@JKDangerfield Its a Raglan

[srikanth94]

sir ur videos r awesome....

[barumman]

A lovely video, first class thanks for sharing. :)

[negrisio9821]

Very nice work... I've learned allot with your videos and downloaded them all just in case they disappear from youtube(you never know). I have one question; since you cast small engine parts do you think they need some heat treatment for them to last longer? In the case of an aluminum engine block “precipitation hardening” is used before machining. Tell me you thoughts about it and keep it up with your vids.

erick

[myfordboy]

@negrisio9821 My engines have a cast iron cylinder lining and all the other moving parts run in bronze bushes so there is no wear on the aluminium castings.

[ryanburbridge]

@negrisio9821 how do you download videos?

[voidmansions]

Once again, about a hundred checks throughout the month for a new video reveals a gem. The core making videos are always a bonus besides normal pattern casting. We've seen you adding measured amounts of sand, linseed oil, flour and wallpaper paste for a core, but I'd love to know how you decide the amounts, or is it just experience? Do you always go for the same hard mix or do you just hazard a guess?

Thank you so much for your videos. I may film my own attempts soon!

[myfordboy]

@voidmansions The reciepe for the baked core was one I read. The quantities worked so I have stuck with them.

I will be using the sodium silicate cores though for all future castings now I have mastered the method.

[ladedk]

Really good video! makes me want to build a furnace right this second! I'm not sure what projects i would cast, but that seems less important right now....

[FreestyleBrain]

great work david, great work

[Arnthorg]

Since the mold came out clean even though the pattern didn't separate. Would it be possible to maybe have the pattern whole if you had a intricate part or were trying to use a part you had as a pattern?

[myfordboy]

@Arnthorg Its quite possible to do this. It takes longer to make up the mould though so is usualy used on a pattern where the parting line is not flat. I show how on vdeo number 3 in this series.

[coriander2]

24 minutes of entertainment. Great to watch. Thanks for posting

[RobRichmondRPG]

David these videos being so educational and you paying such attention to detail, it would be a pleasure to watch your workmanship in high definition. Any thoughts of filming in 1080P?

[myfordboy]

@RobRichmondRPG You buying the camera?

[RobRichmondRPG]

@myfordboy I am thinking about it. But then again maybe we should get you your own TV show.

[myfordboy]

@RobRichmondRPG Myfordboy TV on Discovery channel, sounds good.

[littlestworkshop]

@myfordboy My camera was £130 from comet (Sony Bloggie MHS-CM5) and it does 1080 HD. Perhaps we could all chip in?

[myfordboy]

@littlestworkshop All donations greatfully accepted.

[littlestworkshop]

@myfordboy I'll put in £20, I've got more out of this than the books I've bought. Let me know how you want it sent.

[Axbent]

I crinch when you break the flask, such nice work all ruined!  ;)

[colonelodem]

Beautiful piece!

Another great video, I think I have found my new hobby for when I retire, and at this point it will take me the 26 years to learn it before I do retire!

[apowellz]

Once again, very nice work and very enjoyable to watch! I learn something each time I watch one of your videos. I understand that it is time consuming process to capture, edit, and upload these, but they are all very appreciated. By looking over your shoulder while you work, a better understanding of the process is gained than can be had by reading a book. How often do you re-mull your sand and what do you add to it?

Thanks again,

AL

[myfordboy]

@apowellz Thanks for your comments. I have never mulled the sand. I just sieve it and add water.

[apowellz]

@myfordboy Hmm.. I thought it was an oil based sand and the black color came from burnt oil and that the oil would have to be replaced as it burnt out. It looks like it works very well.

Thanks for the reply.

[mikruson]

I did, but the bicarbonated soda make porosity even biger.I gave up and do not degas but I know it isn't wright way.

[myfordboy]

@mikruson I am not using bicarbonated soda, its sodium carbonate (washing soda)

I am now using losalt as a flux.

[mikruson]

@myfordboy thank's a lot.I will try once more degas...

losalt consist 66% poatsium chloride and 33% sodium chloride ?

[myfordboy]

@mikruson Correct. Maybe your metal is too hot too?

[mikruson]

Perfect job myfordboy!

I use sand mould for casting,but I always have a porosity in my cast..How to avoid this?

[myfordboy]

@mikruson Do you degas?

[gandreou]

I don't know much about machining, I have only watched a couple of introductory DVD's, but when I saw you cutting flat that protruding part at 16:20, you made me hold my breath!

I guess you know so well your lathe by now, that you can trust it to do this job!

(Referring to the physics involved in rotating offset masses.)

[gandreou]

@gandreou I thumbed the video up, btw :D Thank you for your videos!

[francovance1]

Excellent work...most enjoyable!