Re: EDM, was Re: Cheap Encoders

>From: Jim GREGG
>
>I assume that by "Parafin" you mean in US/Aust terms "Kerosine" - not the
>viscous thick stuff sold by pharmacists as "Liquid Parafin" to do dreadful
>things to your insides.

Without quoting chemical formulae I guess you are correct. The fluid needs
to be non-conductive (try using water and see what a mess you get) and also
free flowing so that it can be pumped down the centre of the electrode. I
haven't tried this but it is recommended to clear the eroded metal away
from the spark site. Parafin/Kerosine was mentioned in a book I read as it
is readily available and has a much higher flash point than other easily
available fluids. It still needs to be treated with respect. No doubt the
commercial fluids are non- flammable?

regards
Bill Phillips