Re-casting LG2/Colphos 90 into plate form

[duncan webster 1Participant @duncanwebster1]

Would sae660 do? No idea if it's available as plate

[StueeeeParticipant @stueeee]

The foundries I've used unless requested otherwise use a sand called Petrobond which takes very fine detail. Here's a wooden pattern I made and the casting that resulted.

I did paint the pattern, but the actual finish was as you see here. The resultant casting:

The Capital letters have the squared edge from the pattern and the script letters are rounded as per the pattern. If you CNC'd the letters on your pattern with a consistent draft you would get something cleaner and crisper than this.

Edited By Stueeee on 11/02/2022 16:09:06

[JasonBModerator @jasonb]

What sort of size is that?

[Dave HalfordParticipant @davehalford22513]

Posted by Stueeee on 11/02/2022 16:08:03:

The foundries I've used unless requested otherwise use a sand called Petrobond which takes very fine detail. Here's a wooden pattern I made and the casting that resulted.

I did paint the pattern, but the actual finish was as you see here. The resultant casting:

The Capital letters have the squared edge from the pattern and the script letters are rounded as per the pattern. If you CNC'd the letters on your pattern with a consistent draft you would get something cleaner and crisper than this.

Edited By Stueeee on 11/02/2022 16:09:06

I once met the lad who started Prop Shop, he made lost wax bronze props that came came out of the mould much like that .

His secret was the stuff he first dipped the wax blank into, gave a very fine finish and looked like white toothpaste when wet.

[StueeeeParticipant @stueeee]

Posted by JasonB on 11/02/2022 16:12:12:

What sort of size is that?

14" across. I do quite a lot of 'model engineering' at a scale of 12" to the foot but the small castings I have had done where the foundry has used Petrobond sand could almost be mistaken for die castings. Sometimes when I'm getting a casting done for an early car or motorcycle, I have asked them to use oilsand because otherwise a replacement casting just looks wrong on a 1920 something motor or whatever.

[Wal WerbelParticipant @walwerbel59154]

Posted by JasonB on 11/02/2022 13:09:07:

It might be worth buying a small piece of pb102 and seeing how it machines, although most sites as it is 20-25% machinable that is when compared with hard brass as being 100% and brass is very easy to machine. Different if they said it was 20% of tool steel!

Due to its density I imagine it's as bad to machine as a D3 tool steel (also rated at 20-30% compared to brass). I'd have a go, but probably wouldn't go out of my way to buy a chunk..!

Duncan – good call on the SAE660 – it is available in flats, but so far I haven't found a stockist that does 'em.

Stueeee – that's a lovely bit of casting..!

Thanks again everyone for the help!

[JasonBModerator @jasonb]

It's not that it is hard but being it can easily be cold formed is softer and can be prone to grabbing a drill bit

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