There's actual science being done! omg I worked in science and the underwear part does make a significant difference indeed.

@PaulsGarage

Жыл бұрын

#1 rule in the scientific method, eliminate ALL the variables 🤣🤣

For my propane furnace, I use a "K-Type Probe Thermocouple Sensor & Meter" to get me those 2000+ degree readings :) Great video! Thank you for sharing.

Magic-If you get sick from zinc fumes drink whole milk-It fixes it fast. I welded Galvanized for years and some places that do a lot of it have milk dispensers just for this on the shop floor.

For the propane furnaces, consider an infrared thermometer. I know, liquid metal is reflective enough to skew the readings, but a sufficient matte oxide film on top would help with that, and you can set (or calibrate) the emissivity value on most competent meters. ... Or, you know, feet.

@PaulsGarage

Жыл бұрын

I've tried that and it would probably work with this alloy, but when I cast bronze I don't have a thermometer that can handle it 🤣. A thermocouple jammed in the side can show me furnace temperature, not quite metal temperature, but then I run into the issue where I can't control my janky burner lol

Never underestimate the parts per million in the air in the damage they can do even though you can't see it you can't see anything smaller than 50 microns so always do this furnishing and you will ventilated area! Shop safety is of most importance never taken lately!

Btw a tool that could be helpful for you is a Disappearing filament pyrometer so you might want to look into that

Only problem with the electric is how long it takes to get to temperature! Great job Paul! I’m really enjoying this series

@danharold3087

Жыл бұрын

It can be worth the wait.

@PaulsGarage

Жыл бұрын

You got that right! I'm spoiled with the iron-hot burner melting aluminum in minutes. For the "just right" pour I set it going, helped a kid get ready for bed, then it was ready to pour. It wasn't bad. Them again this is pretty low temperature, bronze might be a different story. Maybe I should try that next 🤔

@ericlotze7724

Жыл бұрын

@@PaulsGarage Mild Steel is my request, if it can handle it.

@PaulsGarage

Жыл бұрын

Mild steel is a bit too hot. This thing maxes out with copper alloys

@ericlotze7724

Жыл бұрын

@@PaulsGarage Are there any off the shelf induction furnaces that can do mild steel? I was looking for what the “next step up” from ones like the ibe you showed, and there was a neat “tilt casting” model with like a *b i g* crucible, but still not steelmill size, something the size of a desktop cnc mill etc, but saying what the max temp is is an elusive specification. Good to know though for this one, thanks!

Jesus christ! its insanely cheap and they deliver to mexico!... Just bought one lol thanks man, seriously... I remember studying a book where it explains all about pouring temperature, even with some tests about fluidity(?) it was fun. Also here in México nobody gives a dang about welding galvanized steel :(

@PaulsGarage

Жыл бұрын

Its shockingly nice for how cheap it is. And always hold your breath welding galvanized 🤣 the fumes aren't even the worst part, the zinc boiling off ruins the welds

It's great to see you do all this testing and experimenting. I've been using an electric furnace for years now, albeit a somewhat more expensive one, meaning higher quality. It can go to higher temperature than many of the cheap ones and does it a lot faster. Although I usually work on the mold while the metal melts so the time it takes means very little to me. 3KG is enough for the small castings I do... Used to do... I really need to get back into casting, life just gets in the way sometimes ... 😅

@PaulsGarage

Жыл бұрын

Which one do you have? I'd love a hotter option, this one maxes out with copper

@ralphmourik

Жыл бұрын

@@PaulsGarage the one I have is the Goldbrunn Therm 3000. It doesn't go that much higher though so copper and copper alloys will still be the max. It can go to 1200c but maxes out at 1150c, the cheap ones I have seen say they go to 1150 but max out at 1100, when melting copper that extra 50c makes a lot of diffirence. Pouring temperature like you demonstrated. I know there are other electric furnaces that can go way higher, I have looked at getting a box furnace, but dang those are expensive.

@PaulsGarage

Жыл бұрын

@@ralphmourik well if all else fails I have that heat treat oven which I've had up to 1250c or so, but I don't feel the need to go any hotter than bronze so I'm sure this cheap one is good enough

@ralphmourik

Жыл бұрын

@@PaulsGarage Fair enough, I love making Tin Bronze, Nordic Gold and Sunset Bronze with this little furnace. Perfect for smaller castings.

Fyi Mifco sells replacement immersion pyrometer TC tips designed for dipping into molten metal. Long lasting for nonferrous, no graphite sheath needed.

@PaulsGarage

Жыл бұрын

That's interesting, I'll look that up. I got one a thermocouple for a large kiln with a ceramic sheath designed for use in soda kilns, maybe your idea would be more simple

@danharold3087

Жыл бұрын

@@PaulsGarage Used on of the ceramic sheath thermocouples for bronze work back in school. The ceramic stayed on the thermocouple but busted into segments about 1" long. The tip ws exposed. Maybe it will work better for you.

I’m excited you finally got one of these! Most reviews/content only cover Propane or Electric Resistive ones, not Inductive! I have some questions: 1.) Can it handle multiple metals (like pretty much anything you throw in there) 2.) Build Quality (will it break after a few months usage/burn my house down) 3.) Capability (is there enough capacity)

@PaulsGarage

Жыл бұрын

This is still an electric resistive oven, not inductive. It can handle anything up to copper alloy temperatures, so everything I need to cast except iron. It seems pretty well made especially for the price, but as always crucibles and elements have a use life and will need to be replaced occasionally

@PaulsGarage

Жыл бұрын

And for capacity, the limit is a 3kg crucible. My propane furnace is much bigger but 3kg would handle most of the projects I have made so far. Vogman has a bigger one of these too and says he never uses anything bigger than the 3kg crucible anyway.

@HarmanRobotics

Жыл бұрын

@@PaulsGarage 3kg of Gold right? So that would be roughly 1kg of aluminum - or about 9 cubic inches of metal.

@PaulsGarage

Жыл бұрын

@@HarmanRobotics 3kg of brass. Kg measurements im crucibles are always in brass

@HarmanRobotics

Жыл бұрын

@@PaulsGarage Oh, so the 3kg crucible has a volume of about 20 cu in then?

Did a lot of tests casting coins blanks (with Zinc Alloy) in a graphite block at various temps using the same furnace. Your advice to Pour at as low as a temp as possible to fill the mold is correct. Too hot and shrinkage becomes an issue including a hole in the center of the gate that travels into the pattern. It is also is the only alloy that will pick up all the detail of the fine reeding around the coin edge.

@PaulsGarage

Жыл бұрын

Interesting, this stuff flows really well so it makes sense it would pick up more detail

Vevor have propane ones here in Oz. So cheap even for 6kg. Got forges too.

@PaulsGarage

Жыл бұрын

I was looking at those. I have too enough propane fired stuff already though

Melt temp and flow temp are 2 different things. Both very important

I've had our electric furnace for about 3-4 months, and I love it! Its dangerously quiet.

@PaulsGarage

Жыл бұрын

it definitely is quiet. I could see it being an issue if you forget to shut it off

@HawkWorley

Жыл бұрын

@@PaulsGarage For me it's more that I forget that it is still molten metal. The whoosh of my propane reminds me of the danger, its easy to forget with the quiet.

Great video. Could you over heat the metal in the propane forge then use an ir thermometer and wait for it to be correct temperature and then pour or would the overheating affect the crystal growth?

@PaulsGarage

Жыл бұрын

Probably? Not sure exactly. Some metals have issues when overheated like zinc boiling off of brass for example. This metal is hypereutectic and you get some separation of higher aluminum content liwuid floating over the higher zinc content stuff, so I assume the issue gets worse the longer it sits as a liquid. And stirring it can cause other issues.

Could you Anneal cast parts (potentially even *in the mold* ) in one of those inert gas furnaces?

@PaulsGarage

Жыл бұрын

Yeah probably. Lots of alloys benefit from heat treating. Doing it in the sand might be problematic, but I've never tried.

Type K thermocouples (the kind easily available from pottery supplies) will actually work to measure molten metal temperature. The trick is not to try to measure it continuously. Melt the metal a little hot, Than measure it after pulling it out of the furnace, when it cools down to the right temperature, then you are ready. Cut the tip off the thermocouple, that way it only makes contact when its touching the molten metal. This way the metal actually forms the measuring junction. As for construction of the measuring setup, you can literally hose clamp the thermocouple to a piece of metal rod and mound the gauge near the handle. leave about half an inch of thermocouple wire sticking out of the ceramic insulators, and dip that part into the metal the full way each time. full disclosure, most of my experience with this is with bronze in a #40 crucible (120 pounds of bronze full) so not only high temperatures, but a good amount of time waiting for it to cool. With zinc and smaller volumes, it will happen faster. p.s. I am one of those Americans who uses pretty much all Celsius, so I feel somewhat smug.

@PaulsGarage

Жыл бұрын

Funny you mention that, I bought a type K thermocouple from a pottery supplier and it's waiting for me to build a rig for measuring metal temperature 😉

@MadMatMetals

Жыл бұрын

I just got my K thermometer yesterday and I was worried about messing it up. But I will give it a try tonight 🤞🏻

IThanks! nteresting and useful. I am wrestling with bronze and aluminium bronze at the moment and have the expected problems. I use a 'gun' type thermometer and also conbcluded that the pouring temperature is important. I use a home built LP gas furnace, but am contemplating an electric one, and am wondering at the relative cost. I use about 1 kg (2.2lbs) gas to melt one Kg (2.2 lbs) alu bronze in about 15 minutes. How much electricity do you use for the same amount of metal? Or where can someone who does not speak mucn electrical find out?

@PaulsGarage

Жыл бұрын

Good question, I have no idea how much electricity this uses, or how much propane I use to melt in my gas furnace. This furnace is only 120v, and it doesn't run long, and it doesn't trip the 15 amp breaker, so I imagine it's not a ton of electricity. But it doesn't melt very much metal compared to my gas one, so it's not a fair comparison. It would work much better to get temperatures right, however.

I've got one of those electric furnaces. Did you notice just how quick the crucibal degrades? Mine showed pot marks on the first use.

@PaulsGarage

Жыл бұрын

Interesting, I haven't seen any damage yet, but I've only poured at zinc and aluminum temperatures so far and only half a dozen pours. Never tried bronze yet. Do you flux or degass the metal? Sometimes those chemicals can screw up the crucibles.

I am so glad you're getting some use out of Campbell's book - I was afraid it would've been overkill but it seems to be killing just fine.

@PaulsGarage

Жыл бұрын

Yes it's extremely helpful, thank you! overkill is the best kind of kill, there is so much useful information in here. Are you on the discord server by chance?

@bobapthorpe

Жыл бұрын

@@PaulsGarage Not yet; I've been meaning to but I'm easily distracted. :)

hmmmm like you said 3kg might be enough , was thinking on making rods for machining on a lathe , was allso thinking on using an electric potterykiln where you could allso keep it at a pretty close to perfect temperature , can you pour the "rods 3 kg at the time , basicly press the cooled metal out the bottom and pour another 3 kg over the top of it ? as for casting and having the metal cool to fast , maibe you can heat the mould up some get it closer to the temperature of the metal you pour in , should help against it cooling too fast going back to the pottery oven , it would take a long time to heat the metal untill liquid in an electric oven and that cost a lot of electricity , wat YOU could do is only preheat the electric oven up to close to the temperature you need while melting the metal in the supercharged propane kiln youre using then transfer the crusible intoo the electric kiln and have it settle (cool down) intoo the temperature you need it to be at before taking it out of that and pour it should take less time and make the metal reach the propper temperature a little eazier

@PaulsGarage

Жыл бұрын

Preheating the mold would definitely help, but I'm not sure it's a good idea with petrobond. I've heard the binder can fail at high temperatures. It doesn't make a lot of sense to me, since I pour hot metal into there, but I don't want to risk it 🤣

Wouldnt you need a 15amp fuse for that furnace?

1. How do you know your electric furnace show the right temp xD 2. The temp also depends on the geometry of your casting and gating system. 3. The Kg rating is a little wrong, because different metals has different densities 1kg in Aluminium is not the same volumetric wise as 1Kg of Gold and Gold is what those things are made for ( so they say) 4. The only downside to pouring zinc too hot is a.) if you get it really really hot and get zinc fumes and b.) you waste more energy than you need, besides that there should not be any problem. I really enjoy your videos, thank you.

@PaulsGarage

Жыл бұрын

1: thermocouples these days, even cheapo ones, are very accurate. I haven't run into one yet that was too far off. 2: you're right, thinner castings should be poured hotter so they don't freeze before filling up. 3: the kg rating is in brass, not gold. I used aluminum bronze pieces as comparison which is similar enough to brass in density. This thing could probably hold double that in gold, but I'll never know since I'm not flush with cash 🤣🤣

@sierraecho884

Жыл бұрын

@@PaulsGarage You are not flush with cash YET, just wait until you become one of those rich youtubers with their Ferrari and stuff. God damn you, I wanted to get a cheap camping gas stove for zamac casting and now you dangle this 240€ furnace from Germany in front of me...AAAARHH haave tooo resist the temptation...

The cooling is important to. I ve read about steel Bronze thats 100 parts copper and 8 parts tin castet in cast iron shells. because they need fast cooling. They wrote the alloy hasnt time enough to end mix when it cools fast enough.

@PaulsGarage

Жыл бұрын

Yeah cooling speed definitely matters too. Some alloys need different rates of cooling or heat treating. It can get weird. Some aluminum alloys need to be heat treated, which seems to do nothing, but then it needs to rest for weeks to reach full strength. Who figured all that out 🤣

@rudycandu1633

Жыл бұрын

@Paul's Garage There also is a lot of people (most) that think quenching a hot cast part, after pulling it out of the mold, should harden it. (If it were a heat treatable alloy) There are two problems with this thought. The misconception is that quenching the aluminum is supposed to harden it. This is what happens to steel but that is not what happens with aluminum. Likewise heating copper and quenching it anneals copper. Heat treatable aluminum must be brought to just below its melting temperature, held there for a minimum period of time, then quenched, as the FIRST STEP in the hardening procedure. Because this does not make the aluminum hard, the same as heating and quenching copper does not make it hard. For heat treating (aka hardening) aluminum requires aluminum to be hot enough, and held there long enough, for the elements in the aluminum to go in solution, so they can migrate and redistribute homogeneously. The rapid cooling, quench, locks the atoms in the structure in place. If the part was to cool slower then the atoms would redistribute and no longer have the required structure. The SECOND STEP to heat treating aluminum is the artificial aging step. When the part comes down to room temperature and left there a slow process of redistribution takes place called natural aging. This slowly hardens the aluminum. Artificial aging is taking the quenched part and heating to a higher temperature (than room temperature but never near the temperature used in the first step) for a set time then cooled. The time depends on the alloy and the thickness of the part. We have all heard of T6 as an aluminum hardness description. The following I pulled from Custom Castings website. (a company in my city) customcastings.com/introduction-heat-treatment/ To achieve T6 temper, the process consists of three steps: Solution Treatment: Heat the casting to ~1000 F for several hours. Quenching: Drastically cool part in a water bath. Artificial aging: Reheat the part a final time at ~300-400 F. Now for the second problem. Most hobby casters think heat treating is taking a just cast part (still hot after breakout of the mold) and then quenching it will give the part a T6 heat treatment. This is wrong because the shaped part has not gone through the required soak time just below the casting temperature. When the cast part has solidified in the mold the solidification has created a non-homogeneous structure. Quenching it does not help because it is not locking in the right structure. And even if the part were to go through the artificial aging step, it will not achieve a sought after hardness because the first step was not correct. While natural aging will produce a harder part in time, artificial aging will produce a harder stronger part. As an aside, (not that this is to give more credibility to my above comment) my brother had worked for a time at Bristol Aerospace quality control department. One of his duties was to do periodic temperature profiles to qualify the heat treat ovens used to heat treat aluminum parts. Along with 9 point temperature measurement logging he also had to do destructive testing of heat treated parts.

I'm new to metal casting and have seen people use talcum powder on the mold and the part. First question: What is the actual purpose for this, and second, can cornstarch work as a substitute? I can't find talcum baby powder they haven't made that in a while from what I understand. Thank you in advance for your help!

@PaulsGarage

Жыл бұрын

The talc is for parting powder. Basically, the sand sticks to itself and everything. That's how it holds the shape. If you don't dust the pattern, it can get stuck. If you don't dust the sand where the 2 flasks meet, they will stick together. The talc sticks to the sand, and then the sand can't stick to anything else.

@PaulsGarage

Жыл бұрын

Looks like Johnson and Johnson is still talc? Unless it says cornstarch

you may ask the brits, but there is no guarantee that thing is still there. long time ago, when i was a teenage student, school teacher told us how the brits measure temperature in a furnace. they have a set of small alloy sticks, all in different melting point. with the instruction telling you which stick is melting means the temperature inside the furnace. that was a 19 century technique, and you can still buy these commercial kit in the late 1970s. don't know if it is still available？？？you have to ask the brits who know the secrets.

That was fun and informative. Are you putting off the big pour still? I was wondering what size the lathe bed is, if you can get the whole thing in one pour…

@PaulsGarage

Жыл бұрын

The lathe bed pour should be the next video. Doing 1 gingery video a month. I definitely have a big enough crucible for the bed in one pour, not sure I'll be able to pick it up full of zinc though 😂

@1pcfred

Жыл бұрын

@@PaulsGarage you'd better be sure before you pick that hot crucible up. Do whatever it takes for that assurance too. This project sounds like it's going to take some planning and doing to me. Beyond just picking the crucible up you have to control it throughout the pour too. Better safe than smokey.

@PaulsGarage

Жыл бұрын

Very true. I've done one handling test so far with ingots stuffed in a cold crucible but I have to do the math and find out if I had enough in there. It's tentatively ok, but things can change when the fire starts

@1pcfred

Жыл бұрын

@@PaulsGarage there's a difference handling it cold and solid and hot and liquid. Beyond just picking it up you have to be able to control it pouring it too. So that's balancing it. It's not a trivial task. This is going to take a trained seal to pull off. They're good at balancing.

Gee, you could have just asked me, I studied this stuff back in the day - at least, the theory anyway... then you wouldn't have had to make a KZread video.... er... anyway - under temp is kinda obvious why it's suboptimal - the liquid just doesn't stay molten long enough to fill the mould... Fun sidenote - circa 1990 CSIRO were testing an Mg-alloy injection moulding machine for car wheels. It injected the metal just below the point at which it started to solidify - being an alloy, it had some fraction solid and some fraction liquid. To achieve filling they had to inject really fast - like... just below the speed of sound in molten metal fast... Why??? to get very fine grained castings... Over temp, you got it pretty spot on - too much shrinkage is the main issue. Also waste of energy. Also damage to the mould can be worse. The thing you may not be so aware of (and probably can't easy check) is that you start to lose the lower melting point metals out of the liquid. You may not be at the boiling point of zinc, but it will still have a vapour pressure over the melt, and that vapour will favour lower melting point metals - so the alloy composition changes the hotter and longer it's in the melting pot... That's fine if the alloy is tollerant of change, but some alloys really do change behaviour when the composition changes - Brass is one - it's phase diagram is fun! Oh, yeah, IIUC, Zinc fume - ZnO particulates - that occur over molten zinc & alloys and welding galvanized metals? It's not great, but it's not as highly toxic as some people might imagine - your body is actually fairly good at dealing with zinc particles in your lungs, and they will dissolve. It tends to be an acute affliction rather than a chronic one. Having said that, yeah, nah, don't be an idiot and take appropriate care of yourself. Odds on if you are raising zinc fumes you are going to be raising other less freindly metals as well, and good habits are as much to protect you from the things you DON"T know are trying to kill you as those that you do...

Remember that if you are using Celsius, you're in the southern hemisphere and you have to reverse the direction of the swirl pot.😂 Now that's some real science right there!

@PaulsGarage

Жыл бұрын

good tip 😂😂 wouldn't want a backwards spinning swirl pot!

Want me to personally teach you how to use your 3D printer to learn sand casting? Click here: paulsmakeracademy.mykajabi.com/joinus *Where to get that electric furnace* : Code: VVMH5%OFF (5% off on all products) Vevor US site: s.vevor.com/bfQdDt French site: s.vevor.com/bfQeAz Germany site: s.vevor.com/bfQeAu Canada site: s.vevor.com/bfQez7 EU site: s.vevor.com/bfQeAf

@timtincher1450

Жыл бұрын

I really appreciate all of your work. Thank you for sharing all of the things you learn. It inspires me, and helps me out tremendously! Thank you!

@PaulsGarage

Жыл бұрын

@@timtincher1450 thank you!

@bulwynkl

Жыл бұрын

ah. And they don't seem to stock the electric furnace - only the propane ones.. *sigh*

@redbinary

Жыл бұрын

I hope that's an affiliate link, you magnificent bastard. I'd been on the fence about an electric furnace for a long time and you just pushed me over the edge here. Whenever I had looked the sets were either much smaller jeweler-size or twice this cost. Good internetting, man!

Through experimentation, the swirl trap just mixes the loose sand with your metal. You will see improvements you replace the swirl trap with a square configuration. Sort of pyramid shape but with a blunt other than a point. The squared shape drop the unwanted sand so that it stays in the trap. What state are you in.?

@PaulsGarage

Жыл бұрын

The idea with the swirl trap is to be a dead end, so any sand mixed in there stays there. I probably should've move the ingate farther away so it didn't feed from the spin trap, but I don't see any issues this time

@PaulsGarage

Жыл бұрын

And I'm in Wisconsin 🐄

@barrystevens2780

Жыл бұрын

@Paul's Garage I'm in mn. If you run your inlet runner past the actual feeder to the part impurities will tend to past by and locate at the end of the run.

I'd be interested to stick them in a vise, and see if there is a strength difference from the pouring temp.

@PaulsGarage

Жыл бұрын

Hey that's not a bad idea for a test. Just one problem, when I moved I left my vise behind and haven't picked up another one yet lol

@willallen7757

Жыл бұрын

@@PaulsGarage Aw, I'd be lost without my vise use it almost daily.

I wonder if you couldn't maybe use pottery cones. Has been years since I've used a kiln but I think the temperatures you're shooting for are in the right range. Bonus, they're pretty heckin cheap

@PaulsGarage

Жыл бұрын

I have a bunch of pottery cones! their problem is they measure heat work, not temperature. It's kinda close but they be accurate enough, because the metal could be overheated for a short time or underheated for a long time and the cone would still bend.

I would expect a catch in the bottom of the sprue before the runner to avoid dragging slag and sand that came loose in the bottom of the sprue along?

@PaulsGarage

Жыл бұрын

Those have been shown to just increase turbulence which can mix up the oxide films. The method i used here was to shoot that initial blast of sand into the spin trap where it slows down and freezes with the initial mix of slag/air/oxides in it, then the runner farther back overflows the clean metal into the mold. These castings showed zero defects, while other castings i used to do always had air and sand in them

@1kreature

Жыл бұрын

@@PaulsGarage Ahh, so that is how the spin trap works! Brilliant!

whats that red glowing thing in the background?

@PaulsGarage

Жыл бұрын

Ever seen a KZread channel with a light far behind them on a wall? I don't have a neon light so that's an LED light shining into a empty red gas can

The one thing I was unsure of with my home made electric foundry was pouring temp. I could get it up to the temp I set no problem. The readout said 750C, and the metal melts at 750C. But even though the foundry was at 750C, was the metal at that temp? How far behind foundry temp does the metal lag? It's the same with the Vevor (looks good by the way, Myfordboy uses one for small stuff). Get the Vevor up to 500C for the Zamak, but then what about the metal? I have seen others use a probe on some sort of heat proof stick. Do you have one? On a side note, have you ever seen so many question marks in a comment before? I think they're breeding.

@PaulsGarage

Жыл бұрын

The metal does lag behind, but the amount depends on how much metal is in there and how quickly you heat it up. A pottery kiln heats more evenly, but you are talking 1 degree a minute at the highest temperatures. Definitely not fast enough for metal casting. I don't have a temp probe but I'm building one at the moment.

@danharold3087

Жыл бұрын

Watch your controller. It will reach the set temperature then the controller will gradually slow down the frequency at which it adds heat. When this is well stabilized the metal will be at the set temperature. Electric furnaces are incredible at heat control when you know this technique.

@lornablewettandlee504

Жыл бұрын

@@danharold3087 Thanks Dan, I didn't know that.

Is it just me or did Vevor just blow up with all sorts of niche industrial tools at hobbyist prices? I have been seeing them recommended by a lot of KZreadrs lately.

@PaulsGarage

Жыл бұрын

Yeah they are really doing a marketing push I think. I get emails from them all the time, finally responded to one. I think it's most of the same stuff as everyone else but they have better prices.

I work maintenance at a plastic shop if you’re interested in some runners and gates. I can grab some.

@PaulsGarage

Жыл бұрын

Maintenance at a plastic shop? Like what do you mean? sounds interesting

@bigbadjohn8207

Жыл бұрын

@@PaulsGarage just a plastic injection molding company

what do you mean you cant measure the temp in your propane furnace? get a K-type thermal couple and readout. drill a hole somewhere in the center, insert the thermal couple and fill the hole with plaster of Paris or firebrick cement and you'll be reading temp like a pro. K-type range is -326 to 2300°F or (-200 to 1260°C) A friend of mine put one in his kiln thats capable of melting copper. i put one in my toaster oven for more precise temp when powder-coating small parts.

@PaulsGarage

Жыл бұрын

I left out some detail there about my furnace. I actually made a port to insert a K type thermocouple, but because my burner is so overpowered the air inside the furnace is always several hundred degrees hotter than the metal and the number wasn't accurate. It would read 2k+ and aluminum would still be solid. If I turn down the burner, it becomes really unstable, so temperature control is an issue. I have a fix in the works at the moment but haven't rolled it out yet

Because I'm a lazy git......have you tried using 'shot blasting' (the new sand blasting) to clean up your castings? People generally don't use sand these days because of getting 'silicosis'.

@PaulsGarage

Жыл бұрын

I haven't but I've seen people do that and also use an acid bath. I don't have a sand blasting booth at the moment

I’ve been thinking temper has been causing some of my problems too. I never actually measure the temperature though.

@PaulsGarage

Жыл бұрын

I don't have much experience with investment casting but I hear temperature plays a big role. Sand can be more forgiving. There are more issues with bronze I think (not certain here) with not only temperature but the atmosphere. Lean burning creates more bubbles in the metal or something? I might have that backwards? Not sure. This electric furnace is straight oxidation though, like a pottery kiln. I'll get back to bronze eventually and do some tests lol. Im working my way into investment casting here pretty soon, probably vacuum.

Hmmm, i don't see any place to enter the coupon code. Anyone?

@PaulsGarage

Жыл бұрын

It might be at checkout?

john Campbell is the guy you need for sure. did some casting in college, the course was just getting started so didn't have much actual casting, actually worked out cuz we went on tours instead. natural resources Canada was shocking , got to look at an electron microscope and see military grade crap get made. any way my point...I was on another tour to a facility that only cast one part, some kind of vessel for nuclear plants. extremely Hight tolerances, every inch x rayed for defects, zero room for error. the owner straight up walked us through how he followed Campbells doctrine to the letter met Campbell a few years later, super briefly at a conference (also as a student) and my teacher mentioned the facility we ad toured and my teacher made a crack about the guy being a dick lol (guy actually was a total dick) and Campbell said "yeah but hes the only one that apparently read my book" lol ill never forget that. it can be very over complicated for what were all doing, and rather difficult to pull off with the tools we have, but i definitely recommend reading everything of his you can get your hands on. they are the only textbooks i didn't sell. has also British which is why I pronounce it aluminium

@PaulsGarage

Жыл бұрын

I think I know the Canadian guy you're talking about and yes that seems accurate 🤣 really good castings though

preheating the sand and flask? (if it wasn't made of wood even more)

@PaulsGarage

Жыл бұрын

investment casting usually works that way, but this sand probably wouldn't like it. It's oil bonded and seems to have trouble holding when it gets hotter

A 3Kg crucible holds 3Kg of what exactly? 3Kg of gold is many times smaller than 3kg of aluminum. Since metals have such drastic density differences, isn't weight alone inaccurate for sizing a crucible?

@PaulsGarage

Жыл бұрын

The measurement standard for crucibles is done in mass of brass. Not sure why, it's just how it is. Brass is a bit denser than iron, slightly less than copper.

Try to adjust the lighting a bit, its quite over-lit sometimes. Makes it hard to see anything

@PaulsGarage

Жыл бұрын

lighting this stuff is super hard, i'm struggling for sure. The problem is this metal comes out of the sand SUPER reflective, and the camera freaks out, so i can either show the casting with nothing visible behind it, or the casting looks all bloomy. I'll figure it out eventually lol

Fahrenheit is a better scale for normal life. Luckily, melting metal is not normal life, and you can just learn the Celsius for each alloy you use.

@PaulsGarage

Жыл бұрын

I should probably just get used to it lol

Those "3 KG" is is 3 KG OF GOLD! And gold are HEAVY! So, 3 KG crucible can hold 155 ml of liquid metal. Or 420 g of aluminum. Or 1.1 kg of zinc.

@PaulsGarage

Жыл бұрын

KG measurements in crucibles are always in brass. There are a few places that say it's gold, but they're wrong. The standard is always copper alloys. I'll tell you this 3kg crucible holds FAR more than 155ml. These castings were done one at a time with the 3kg crucible, and they were maybe 1/3 full for the pour, the bulk of which ended up in the pouring basin and spin trap. I could've done this whole thing with with 1kg crucible but i didn't have any chunk of za12 small enough to fit in there

@mnus2016

Жыл бұрын

@@PaulsGarage could you check please how many ml fits in those crucibles? Should be easy enough with a measurement cup and water.

@PaulsGarage

Жыл бұрын

@@mnus2016 just tried, and it's not a very accurate measuring cup, but the 1kg crucible holds about 125ml or so.

😂 clickspring catching strays for absolutely no reason. Let him cook.

@PaulsGarage

Жыл бұрын

🤣 clickspring is awesome but I get the feeling he is half wizard. I watch some of what he does and it just blows my mind

Welcome to Metric... and the 21st Century! xD

@PaulsGarage

Жыл бұрын

I prefer to stay in the 19th century, thank you very much! 🤣

Hey, wait. wait. It's 2023. You can't just openly confirm that an renown expert with PhD is Physics, metallurgy, crystallography, mineralogy, casting science is right. And some random guy on an anonymous forum is pulling "facts" out of the crusty crevice of his ... armchair. That's pitchfork and torches talk🤣

@PaulsGarage

Жыл бұрын

Haha you're right now could I forget 🤣🤣. I'm still going to test the stuff out though... Replication studies and all ..

That's the root of all your issues. You're wearing underwear. Eliminate that flaw, and castings will be perfect every time.

@PaulsGarage

Жыл бұрын

Perhaps I should get a thick leather "safety kilt" and forego undergarments altogether in the name of casting quality?

@user-qy9rg3nt2l

Жыл бұрын

@@PaulsGarage Post a video when you do.

1:39 I’m beginning this channel is just a cover for you illegally arming a Lochos controlled by you DESPITE your lack of the proper permit for pike production… /j

@PaulsGarage

Жыл бұрын

If I was doing that I'd use more bronze. I have some bronze here... 🤔😉

Celsius? I thought you said you knew what temperature the metal is? Gotem!