Metal Melter

[Kram]

Two more from yesterday

 

[Onoff]

I went to the pub on the way home, it was peeing down so I had to neck a pint inside in the dimly lit interior. Took 36 very rough pictures with the light source another phone. Definitely has potential!

Going back to the pub now.

 

[Misterg]

Anyone know where I can get some fine or very fine grit sand?

Kiln dried sand for block paving is usually pretty fine.

 

[Onoff]

Went back up the pub Friday night to take more pictures of the cow. Somehow I forgot...

 

[Onoff]

@Kram how about Moon Sand like the kids play with. Holds it's shape really, really well. Also known as kinetic sand.

MOON SAND ™ Isn’t Just For Kids Anymore

» MOON SAND ™ Isn’t Just For Kids Anymore |

hammerspacehobby.com

 

[Kram]

It may work but oil/cornstarch are going to burn/smell/go rancid.

Another idea is a light coat of plaster before the sand. There should be enough moisture to get a bond to set. Need to be heat gunned to dry out but should give detail and surface finish.
Ive got a bronze trophy coin thing looks cast. Im going to try molding that as a test to see what detail I can pick up.

Last pour. Ive been too lazy to edit the rest.

 

[Onoff]

It may work but oil/cornstarch are going to burn/smell/go rancid.

Another idea is a light coat of plaster before the sand. There should be enough moisture to get a bond to set. Need to be heat gunned to dry out but should give detail and surface finish.
Ive got a bronze trophy coin thing looks cast. Im going to try molding that as a test to see what detail I can pick up.

Last pour. Ive been too lazy to edit the rest.

And So Castings Made Of (Kinetic) Sand . . . Turn Out Pretty Well, Actually

That kinetic sand stuff is pretty cool. It’s soft, it builds motor skills, and outside of sprinkling it on carpet, it’s not messy. If you don’t know, it’s 98% sand and 2% po…

hackaday.com

 

[Kram]

Today was a brass test.

850c indicated appears a good temperature for brass. Almost zero zinc fume. Near the end I did have problems with the rcd tripping 3 times
Started a mold. @Onoff I found this old fishing trophy coin, thought it'd be a good challenge! Lots of detail.
Im using a two part sprue former that was cast last time.

I gave it a light dusting of dry plaster powder. Possibly too much..

Sprue has a 1mm hole and pinned with a broken drill shank. Glued with wax.

Quite bloody good!

Total pour 535g and each coin 105g each, though I havent trimmed the flashing or all of the gate.

 

[Onoff]

That's ace! Is that from the clean plumbing scrap I sent you?

 

[brightspark]

if u want fine detail.use petrabond oil sand https://www.google.co.uk/search?q=petrobond+sand+uk&sxsrf=APq-WBt3agHdnsZHqR-1kV8KoXrDewcbZg:1647283869293&source=hp&ei=nY4vYsGbEIWFhbIP8eiW4Ao&iflsig=AHkkrS4AAAAAYi-crZyLCw5A4DO_X_P1atrNy0cksUfm&oq=petrabond+&gs_lcp=Cgdnd3Mtd2l6EAEYATIECAAQCjIECAAQCjIHCAAQyQMQCjIECAAQCjIECAAQCjIECAAQCjIECAAQCjIECAAQCjIECAAQCjIECAAQCjoECCMQJzoLCC4QgAQQsQMQgwE6CwgAEIAEELEDEIMBOg4ILhCABBCxAxDHARCjAjoOCC4QgAQQsQMQxwEQ0QM6CAgAEIAEELEDOg4ILhCABBCxAxCDARDUAjoFCAAQgAQ6CwguEIAEEMcBEKMCOggILhCABBCxAzoFCAAQkgM6DggAEIAEELEDEIMBEMkDOggILhCxAxCDAToRCC4QgAQQsQMQxwEQrwEQ1AI6BwgAEIAEEAo6BwguEIAEEAo6CwguEIAEEMcBEK8BOgYIABAKEB46CgguEMcBEK8BEApQAFiFH2ClOGgAcAB4AIABjwGIAZYIkgEDMy43mAEAoAEB&sclient=gws-wiz you can actually get your finger prints cast in the detail is that good

 

[Kram]

That's ace! Is that from the clean plumbing scrap I sent you?

Thanks! The clean brass is still boxed, I used dirty old stuff, theres a tap or two, some nuts.
There was plenty of dross, 200g, half is powdery rubbish and the other half looks like clean metal that stuck to the spoon so that can be remelted. I'll use it next time as, if it doesnt go into the melt atleast it will float and protect the stuff below.

How is the cow print? I think Im ready to try it.

 

[Onoff]

Thanks! The clean brass is still boxed, I used dirty old stuff, theres a tap or two, some nuts.
There was plenty of dross, 200g, half is powdery rubbish and the other half looks like clean metal that stuck to the spoon so that can be remelted. I'll use it next time as, if it doesnt go into the melt atleast it will float and protect the stuff below.

How is the cow print? I think Im ready to try it.

I won't be doing any more until the pub opens on Thursday when I'll take a load more pics for my lad to run through Meshroom etc. Thursday looks nice and bright and dry too. I'll try and take a white sheet / board up to lay on a table as a neutral background in the garden then snap away.

 

[Kram]

@brightspark Petrobond is just a different way of binding, the detail will be no better if you use a coarse sand to make it. To do detail with green sand you need an extra dusting of facing sand. With very fine sands, green needs to be baked/heat gunned to prevent steam buildup but it can go just as fine.
Im happy with this detail - it would have been better if half the plaster didnt stick on the pattern!

Sand was very dry after the brass, sieved a lot of rubbish out, should be better for next time.

 

[Onoff]

Attended the pub this afternoon for an all too brief single pint. Took a load more photos of the cow ornament. Tried taking them outside on the bench but the sun was too low by then and casting shadows. Came inside and just snapped away with the cow on the bar and flash on.

Lad ran it through Meshroom. Still not overly impressed.

Then he tried 3DF Zephyr, the free one with the max upload of 50 photos. As recommended by @JMS1972.

Better, but still needs work around the horn etc. I will try it on a white background like I said. Unfortunately that means I have to go back tomorrow night...

 

[JMS1972]

Attended the pub this afternoon for an all too brief single pint. Took a load more photos of the cow ornament. Tried taking them outside on the bench but the sun was too low by then and casting shadows. Came inside and just snapped away with the cow on the bar and flash on.

Lad ran it through Meshroom. Still not overly impressed.

Then he tried 3DF Zephyr, the free one with the max upload of 50 photos. As recommended by @JMS1972.

Better, but still needs work around the horn etc. I will try it on a white background like I said. Unfortunately that means I have to go back tomorrow night...

View attachment 338069

Black background is better with photogrammetry.... Looks pretty good though.

 

[Onoff]

Black background is better with photogrammetry.... Looks pretty good though.

Pub has a few blackboards, any good?

 

[JMS1972]

Pub has a few blackboards, any good?

If they are Matt black yes probably. If they have the remains of a million dish of the days they maybe not

You are looking for a featureless background so the algorithm isn't confused.

Ideally a diffuse lighting rather than flash too. I use a lightbox if I can but an over cast day also works well for larger objects.

 

[Onoff]

Tried photographing the cow ornament in the dim light of the pub last night (as I forgot Friday night )

Did it against a menu blackboard. Results were absolutely dire. 3DF Zephyr could create nothing intelligible nor could Meshroom.

 

[Pete.]

Tried photographing the cow ornament in the dim light of the pub last night (as I forgot Friday night )

Did it against a menu blackboard. Results were absolutely dire. 3DF Zephyr could create nothing intelligible nor could Meshroom.

Have a few more pints and try again

 

[Onoff]

Have a few more pints and try again

If you insist!

@JMS1972 do you think as the cow ornament is dark, it would be better shot against a white background?