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  1. #31

    Default Re: Help! Stuck rod sections!

    I'm curious, when behind the knees and pulling apart, what happens? hands slide or just won't part?

    Never seen a rod that you couldn't part this way.

  2. #32
    Join Date
    Nov 2014
    Location
    Hertfordshire, in the middle of the fly fishing desert
    Posts
    1,379

    Default Re: Help! Stuck rod sections!

    Quote Originally Posted by ed_t View Post
    As a physicist what are your views on surface roughness friction or van der waals bonding dominating the stuck spigot?

    I'd go for the latter being dominant as opposed the former that are used in machine tool and press fit binding.
    Since we are looking at predominantly graphite here at the contact point, personally I would expect van de Waals to be insignificant (after all the week van de Waals forces between layers are what makes graphite work as a lubricant), and since surface roughness friction will also be heavily dependent on the perpendicular force due to any contraction I would expect that to be more significant. As I said, I would try to enlarge the tube by gentle, slow heating.

    Steve

  3. #33
    Join Date
    Aug 2012
    Location
    Glasgow, South side
    Posts
    268

    Default Re: Help! Stuck rod sections!

    When I have tried the behind the knee trick with rubber gloves on there is just no movement at all. Ps still stuck fast after an evening sesssion last night!

  4. #34

    Default Re: Help! Stuck rod sections!

    Quote Originally Posted by gg76 View Post
    When I have tried the behind the knee trick with rubber gloves on there is just no movement at all. Ps still stuck fast after an evening sesssion last night!
    Have you tried heating the female spigot with a hairdryer (whilst guarding the male spigot, and preferably cooling the protruding end first?)

  5. #35
    Join Date
    Apr 2008
    Location
    bristol
    Posts
    1,133

    Default Re: Help! Stuck rod sections!

    OK here is the fix to end all stuck rod sections. If you follow what the video below does.......But use 4 people not just two!!

    Everyone gets close and buddy like but it's possible.

    I would say good luck but you won't need it






    Sent from my iPhone using Tapatalk Pro

  6. #36

    Default Re: Help! Stuck rod sections!

    Your missus didn't put a few drops of super glue in when you weren't looking did she?! Mine would.

    Reg Wyatt

  7. #37
    Join Date
    Dec 2014
    Posts
    2,116

    Default Re: Help! Stuck rod sections!

    Quote Originally Posted by themind View Post
    Since we are looking at predominantly graphite here at the contact point, personally I would expect van de Waals to be insignificant (after all the week van de Waals forces between layers are what makes graphite work as a lubricant), and since surface roughness friction will also be heavily dependent on the perpendicular force due to any contraction I would expect that to be more significant. As I said, I would try to enlarge the tube by gentle, slow heating.

    Steve
    I take your point but all my fly rods have painted male spigots. I give them a rub with candle wax every now and then (mental note: give them a rub tonight). My beach rods have ground carbon male spigots so friction probably dominates, but the paint could have some additional weak bonding to the presumably honed carbon on the female.

    The fizzy drink trick sounds mad but CO2 is highly mobile through polymers, and is the propellant in WD40 so will also be saturated in the oil when first applied.

    I'd still go with a soak in WD40, sandwich between a couple of bags of frozen peas for 1/2 an hour, then the hair dryer on hot on the female bit. Three pronged attack with oil/penetrant to disrupt any chemical stiction, shrink the lot then rapidly heat the outside. A hair dryer isn't hot enough to damage the blank.

    An oxy-acetylene torch is a good way to release seized nuts. Bit much for a carbon rod though.

  8. #38

    Default Re: Help! Stuck rod sections!

    Is there any update? Has this rod been seperated yet?

  9. #39
    Join Date
    Aug 2012
    Location
    Glasgow, South side
    Posts
    268

    Default Re: Help! Stuck rod sections!

    Still stuck, I will try the wd40 etc when I have some time. Help! Stuck rod sections!

    Sent from my FIG-LX1 using Tapatalk
    GG

  10. #40
    Join Date
    Jul 2012
    Location
    polmont central scotland
    Posts
    332

    Default Re: Help! Stuck rod sections!

    Quote Originally Posted by gg76 View Post
    Still stuck, I will try the wd40 etc when I have some time. Help! Stuck rod sections!

    Sent from my FIG-LX1 using Tapatalk
    Had the same problem 2 weeks ago in Assynt.Left my rod lying in the sun,(yes we had a day of sun).When dismantling the rod the 2 sections were stuck solid.Tried all the usual techniques.In the end dipped the rod in the loch for 3_4 minutes and they seperated no problem.A few years ago I did have a stubborn joint that would not come apart.Luckily it was a spigot joint.What I did was turn the 2 stuck sections vertical and poured Armourall down the female section and left it overnight to soak.Next morning I M/Td the residue out and the sections seperated no problem.What I do now is carry an aerosol of graphite spray that locksmiths use,and give the joints a spray.So far I have had no problems with stuck joints.

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