After the usual wait, PB Blaster, or Mouse Milk loosen the corrosion and
provide a lubricant. Metal fragments, depend on size. Over time, they
tend to corrode faster than the tubing, My C19XR uses a row of 3 rivets
with one quite close to the end, but the factory holes have been
deburred. Disassembly just requires carefully drilling out the head
without drilling into the tube. They are 1/8th" rivets, so a sharp, 1/4
inch drill works well at removing the heads, A small drill, or drift
punch easily pushes the shank into the tube, leaving a clean hole. Fine
Scotchbright pads will shine up the outside of the inner tube and a
small wire brush for cleaning tubes that size usually works well. Use
lots of Noalox when reassembling.
The scratches may, or may not be a problem depending on the depth. Deep
scratches tend to have ridges along the edges. Just smooth off the
ridges along the scratches. before reassembly.
73
Roger (K8RI)
On 6/12/2016 Sunday 1:06 PM, StellarCAT wrote:
generally I find its not only corrosion but metal bits from holes that
weren't cleaned on the inside (how would one do that!?) ... THEY put
the breaks on BIG time... the one I did manage to separate with lots
of time and effort had scratches around the tubing from the fragments.
If indeed that is the case, with corrosion acting as a dry agent (LOTS
of friction) - its nearly impossible to separate them.
g.
-----Original Message----- From: Patrick Greenlee
Sent: Sunday, June 12, 2016 8:49 AM
To: towertalk@contesting.com
Subject: Re: [TowerTalk] Loosening Al tubing to Al Tubing
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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73
Roger (K8RI)
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