Hot air gun / blow torch

Model Engineering in UK - Model engineering, metal crafts in UK 

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Subject Author Date
Hot air gun / blow torch grumpyat 03-20-2008
Posted by on March 21, 2008, 5:32 pm
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> > Slightly at a tangent to Model Engineering but worth a try.
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> > I need a hot air gun to shrink some =A0'heat shrink' onto some cables.
> > No power available. =A0Not feasible to use a genny. =A0I thought of
> > adapting a gas blowtorch to provide heat at the nozzle instead of a
> > flame. =A0I have a choice of 3 types of blowtorch.
> > Plumbers gas bottle type with a hose and torch
> > Plumbers disposable gas can type
> > DIY 'ronson type' =A0 =A0 =A0" =A0 =A0 =A0" =A0 =A0 =A0 "
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> > Problem is I do not know the best way of doing it.
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> > Cables are quite hefty =A0400mm^2 each core!! =A0but I want to keep away=

> > from direct heat.
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> > All advice gratefully received, thanks
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> I haven't tried this, =A0just a wild idea. =A0 get the heatshrink in place=
and
> wrap in tinfoil, =A0warm the whole lot up gently. =A0Or use self amalgamat=
ing
> tape!
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> Steve- Hide quoted text -
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> - Show quoted text -

Might work, but I don't really want the severity of a naked flame
more a sort of difused indirect heat. The idea behind the blowtorch
adaption was for portability, but it is looking like a non starter.

Posted by John on March 21, 2008, 6:19 pm
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> Cables are quite hefty =A0400mm^2 each core!! =A0but I want to keep away
> from direct heat.

Too right that 400mm^2 cable isn't normally used in model engineering.

There's various types of heat shrink tubing. Some shrink at temps as
low as 90C so boiling water may be a possibility if the rest of the
system can dry afterwards. They also have different physical
properties that you may want to consider. Google "heat shrink" and
there's lots of info.
Have you looked at other insulating sleeves. Silicone rubber is a good
alternative on smaller cables. I don't know if you can get it in this
size though.
Amalgamating tape is good, so is cloth insulating tape in the right
location.

John


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