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Posted by Ernie Leimkuhler on March 13, 2008, 10:55 pm
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> Ernie Leimkuhler wrote:
> >
> >
> >> A woman I know is looking to buy a new torch for oxy-propane use for
> >> localised heating of glass. She currently has an old oxy-acetylene torch
> >> and is using it with oxy-propane which seems to work OK but the torch
> >> seems to be obsolete and tips not available and she only has a 2 tip,
> >> when tried with my OA torch a 5 or 7 worked much better for the task.
> >> Many torches are available cheaply for OA and some can be gotten with OP
> >> mixers.
> >>
> >> My question is what benefit does using a mixer designed for OP use have
> >> against using a OA mixer for OP.
> >>
> >> TIA
> >>
> >> Dave
> >>
> >
> > In Seattle the most common torch used for glass work is a Harris.
> > They have the highest throughput of gas of any handpiece.
> >
> > I believe this is the one.
> >
> > http://www.harrisproductsgroup.com/equipment/torchInfo.asp?id=43-2
> >
> > Run it with 3/8" hoses and a high output regulator.
> >
> Thanks Ernie,
>
> For me many of the pages on the Harris site don't display a lot of the
> pictures and the 43-2 is one of them but searching elsewhere has shown
> the type of torch. It would appear much larger than is necessary at the
> moment. Some other searching on the Harris site has turned up
> http://www.harrisproductsgroup.com/equipment/mixer.asp?id=f and
> http://www.harrisproductsgroup.com/equipment/mixer.asp?id=e which gives
> an explanation of the mixer types. From those details it would seem that
> the standard mixer used in an OA torch is fine on the OP set-up being
> used as both gases are provided to the torch from high pressure
> regulators so not requiring the F type mixer.
>
> Do you get involved in Pilchuck as this torch use is glassblowing related.
>
No but I am good friends with the owner of the only Torch and Regulator
repair shop in Seattle.
He is the one who told me about the Harris hand piece.
> I also noted that the Harris tip numbering system may be different to
> that I am used to in the UK. At least with my old BOC torch, I still use
> the same tips, I read the tip number is the nominal flow in CFH on OA. I
> know from testing at the studio with my torch that a 5 and 7 work well
> on OP and I have a selection to 18.
All manufacturers use different number systems for their tips.
Personally I prefer Victor since they have the best valves in the
business.
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>localised heating of glass. She currently has an old oxy-acetylene torch
>and is using it with oxy-propane which seems to work OK but the torch
>seems to be obsolete and tips not available and she only has a 2 tip,
>when tried with my OA torch a 5 or 7 worked much better for the task.
>Many torches are available cheaply for OA and some can be gotten with OP
>mixers.
>
>My question is what benefit does using a mixer designed for OP use have
>against using a OA mixer for OP.
>
>TIA
>
> Dave