Put some ice inside the smaller ID tube, cap the end and apply plenty
of heat to the outer tube while trying to dislodge it. If available, dry
ice is better. Many Walmart stores used to sell it. The trick is to
heat the outer tube quickly after letting both be chilled by the ice.
If the workpiece will fit in the freezer chill it there before adding
the ice and heating the outer tube. The tubes are often hard to separate
due to some corrosion but that corrosion will partially insulate the
inner tube from the outer tube and helps keep the inner tube cool while
you are heating the outer tube to expand it.
Patrick NJ5G
On 6/12/2016 7:29 AM, StellarCAT wrote:
I have a few sections from a used yagi purchase that are like this - a
few of them I managed to get apart with lots of effort using a screw
driver in an existing hole and lots of pulling ... the rest just
wouldn't budge. Heating I don't believe works - its near impossible to
heat them independently - so they expand together... I tried WD-40,
and the slippery stuff - can't remember its name but for this purpose
- nothing worked. These pieces are now in my scrap pile replaced with
new material from DXE.
Gary
-----Original Message----- From: Don W7WLL
Sent: Saturday, June 11, 2016 7:31 PM
To: Towertalk
Subject: [TowerTalk] Loosening Al tubing to Al Tubing
Want to restore a small inherited tribander for portable activity.
Have a couple of tube to tube joints that are not coming apart with
‘gentle persusian’. They been sitting in a coast air environment for a
few years (maybe 10).
What recommendations here on TT of best solutions (s) to work into the
joints.
Don W7WLL
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