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Diecast Forums Forum 43 Diecast Zone

Posted By: Graeme Ogg
Posted On: Friday February 7, 2020 at 3:27 PM
 
Message:
Yes, I think it's just a matter of conventional terminology.
Strictly speaking, if you make anything by "casting" (i.e. pouring) molten metal into a "die" (i.e. a mould) then you could describe it as "diecast". But it seems that in manufacturing the term "diecasting" is reserved for the process where a strong, high melting-point metal (usually a zinc alloy) is forced into a steel mould under very high pressure to ensure that every nook and cranny within the mould gets filled accurately.

If you use a softer metal with a lower melting point and just pour it into the "die", that can be called "metal casting" but not "diecasting"!

As others have already pointed out, instead of using very expensive high-pressure machinery, and expensive moulds which have to made by etching the required shape into a block of stainless steel, people like Brooklin pour a low melting point alloy of tin and lead into a hardened ("vulcanised") rubber mould, and rather than forcing it into the cavity by high pressure it's done by just spinning the mould as you pour the hot metal so that centrifugal force does the job.

The same technique is used for resin models, since of course resin also has a low enough melting point for rubber moulds to handle it, although in both cases the heat (and the process of removing finished castings) tends to degrade the rubber, so replacement moulds have to taken off the master model at regular intervals.

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Message thread:

(PIC) Here is a good example of a serious banana shape... by Lloyd Mecca #27275
I saw one of those on ebay by carl parrish #27275.1
Why not a CLAIM to the owner of NEO? IS A FRAUD!!!!! (EOM) by renato camesasca #27275.1.1
Carl, you are right! I use to have quite a collection of Neo models, by Alex Taylor #27275.1.2
I have quite a few white metal models that are laughable as well...not by Bob Jackman #27275.1.2.1
Point of order - white metal models are not diecast. by Harvey Goranson #27275.1.2.2
Whatever they are made of, they can all be good, bad or indifferent. by Graeme Ogg #27275.1.2.2.1
Well stated Graeme. (EOM) by Harvey Goranson #27275.1.2.2.1.1
If a model looks right to me and I like it I will buy it whether it's a cheap diecast or by Rich Pendleton #27275.1.2.2.1.1.1
I just have one NEO model. Although that another one tease me by Michel Lemieux #27275.1.2.2.1.1.1.1
I'm delighted with my NEOs -- I just avoided the inaccuate subjects--or those that have gone bananas (EOM) by Mark Lampariello #27275.1.2.2.1.2
+1. Some of them are very good, like this Maserati. by Harvey Goranson #27275.1.2.2.1.2.1
Brooklin are centrifugally cast in rubber molds, so that means they are not diecast. Is... by Karl Schnelle #27275.1.2.2.2
Yes, I think it's just a matter of conventional terminology. by Graeme Ogg #27275.1.2.2.2.1
Thanks, man! Part of the fun in collecting is knowing these type details! (EOM) by Karl Schnelle #27275.1.2.2.2.1.1
Which brings up another point Karl. by Harvey Goranson #27275.1.2.2.2.1.1.1
All good points, but let's not forget the fine old slush cast models. (pic) by David Holcombe #27275.1.2.2.2.1.2
Always great to see the old ones, thanks. (EOM) by Rich Pendleton #27275.1.2.2.2.1.2.1
Who can explain how hot molten metal can be poured into by John Quilter #27275.1.2.2.3
Low melting point metal and high melting point molds. by Harvey Goranson #27275.1.2.2.3.1
Spin Casting White Metal by John Daniels #27275.1.2.2.3.1.1
Different types of rubber used for moulds. Brooklin and by John Roberts #27275.1.2.2.3.1.1.1
That mold looks just like the ones we used at MTI (EOM) by Rich Pendleton #27275.1.2.2.3.1.1.2
Since we seem to be on technical roll here ... by Graeme Ogg #27275.1.2.2.3.1.2
No! Are your degrees in Celsius? Now you can have your coffee. (EOM) by John Kuvakas #27275.1.2.2.3.1.2.1Zone Diplomat
Yes! My degrees are in Chemical Engineering! So those values are C! :-) (EOM) by Karl Schnelle #27275.1.2.2.3.1.2.1.1
Speaking of rubber, can we find a way to unvalcanize by John Quilter #27275.1.2.2.3.1.2.2
Tyres can be recycled OK. by Graeme Ogg #27275.1.2.2.3.1.2.2.1
And the money to do it. (EOM) by Harvey Goranson #27275.1.2.2.3.1.2.2.1.1




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