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Hi Louis, (and all),
I certainly don't dispute your explanation of the casting process, not at all -
in fact I found it interesting to read about the cooling process.
However, all the RC-10-family cars I've ever owned were made of nylon. At least
the bits that weren't aluminum or steel were nylon. This is why these parts
were able to take the boiling process - and can be, as you say, coloured with
fabric dye in the process, if one is so inclined.
As a sidenote, a lot of R/C car parts are now made of some kind of
graphite/plastic composite, and de-stressing can actually do more harm than
good.
Boiling is (er, was; not so much anymore) also used to remove old tires from
rims by breaking down the cyanoacrylate glue used to stick them on in the first
place. Recently though, when I went to do my usual routine on a batch of wheels
(I should've checked what they were made of first), they came out looking like
they belonged in a Salvador Dali painting. A bit of investigation revealed that
the rims were made of ABS plastic.
Ultimately, I would suggest that if anyone wants to try to de-stress a Lego
gear or anything like that, they should first test on a piece they can afford
to lose.
And don't burn yourselves. :)
Cheers,
KMaynes
In lugnet.technic, Louis Raymond writes:
> Hello all,
>
> May be I can help a bit with this conversation, I work in plastic
> injection moulds, when injecting ABS it becomes stressed cause
> of the path it must take to fill the cavity of the mould, when ejected
> from the mould, the parts are supposed to fall in a tub of water to
> cool them down slowly, but this takes time, and time is money, so
> not all of them do this, or do it but there is a lot of parts in the
> water, when you do this on your own stove you cool them down
> the right way, the best example I can give you is this, take a look
> a R/C car parts, I had an RC/10 with a lot of parts made with ABS
> once boiled in salted water or water with cloth die in it, the parts
> where a little more flexible, the boiling takes the stress out of the
> parts, that why they break less once boiled.
>
> excuse the bad english, i'ts not my strong point.
>
> Regards,
>
> Louis Raymond
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In lugnet.technic, Kevin Maynes writes:
<snip>
> Ultimately, I would suggest that if anyone wants to try to de-stress a Lego
> gear or anything like that, they should first test on a piece they can afford
> to lose.
That's what this was all about:
http://news.lugnet.com/technic/?n=6899
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> Ultimately, I would suggest that if anyone wants to try to de-stress a Lego
> gear or anything like that, they should first test on a piece they can afford
> to lose.
Been there, done that :)
I think the gears are made of one kind of plastic (nylon?), axels
another and bricks a third (ABS).
Upon my searching through the Internet I've found a lot of pages about
RC-car-wheel-boiling...
/Tobbe
http://www.arnesson.nu/lotek/
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