The Craftmans Shop > New from Old
Resurrection of a CFEI 100 KVA Induction Furnace
awemawson:
Years ago as an experiment I did some hammer welding of some bar like that illustrated glowing above, and it was hot enough!
Leave a bar too long in and you can suffer the indignity of melting the end off !
awemawson:
Time to investigate the Flamefast DS130 Main Jet:
It nestles behind a 1/2" BSP plug blanking off one branch of a Tee fitting, and the jet is long enough to project into the Venturi chamber allowing the passing forced air to draw gas through the jet and from the 'Zero Pressure' valve. I don't think I've had this out before as it wasn't familiar as I dismantled it.
Anyway, using drill shanks as precision measuring tools (!) it measures as 4.1 mm - this doesn't correspond to either of the two possible sizes cited by the late Tim Leech in the document I posted above where he says #28 (3.56 mm) for Propane and #17 (4.39 mm) for Natural Gas
. . .odd :scratch:
russ57:
Half way in between..
Sounds like a 'universal' option..
-russ
awemawson:
Funnily I just voiced that possibility to the wife :clap:
I can't think Flamefast would have sold it with a universal jet and still labelled it for Natural Gas, probably more likely some one has modified it over the years, after all it's 38 years since it was made - lot's of time for fiddling by someone trying to get more oomph out of it!
Frankly as long as the flame is OK I don't suppose it matters much - I need to investigate the torch and bunsen pilot light though as they are quite fierce.
The other variable is supplied gas pressure - I'm just setting the regulator on the cylinder to a low PSI, the label says 20 mBar which is 0.3 PSI, BUT all gas supplied goes directly to one big internal regulator which I haven't tweaked so presumably it's set as per Flamefast intended.
There are test nipples on both the inlet and outlet sides of this main internal regulator and I do have a suitable gas rated manometer (from when I did a CORGI course years ago) so as long as it's rubber tube hasn't perished too much I can measure it, but not knowing what pressure the internal gas plumbing is supposed to be anyway I haven't bothered.
. . . life is full of conundrums :med:
Pete.:
Does the jet size and pressure affect the flame properties in the same way as an oxidising/reducing flame from a gas welding torch or is it just a matter of efficiency?
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