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MrCetirizine

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About MrCetirizine

  • Rank
    Advanced Member

Profile Information

  • Gender
    Male
  • Location
    Alford, Lincolnshire
  • Interests
    Target shooting, photography, gadgets.

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914 profile views
  1. MrCetirizine

    3D Prints

    Same as the metal ones only they don't cut your thumb or cause you to swear. They are a bit more flexible being plastic so they don't grip the cartridges quite as hard as the usual metal ones so I wouldn't want to go into battle with them but for range use, they are great.
  2. MrCetirizine

    3D Prints

    Here's a link to my Thingiverse which has a few things. https://www.thingiverse.com/MrCetirizine/designs
  3. MrCetirizine

    3D Prints

    After having a printer that's only capable of PLA for so long, it's fantastic to now have a choice of materials to make truly strong functional parts. PETG > Nylon 12 > Polycarbonate
  4. MrCetirizine

    3D Prints

    The same test piece (nut and bolt) but this time in polycarbonate...
  5. MrCetirizine

    3D Prints

    Yep, mk3s but I got it a tungsten nozzle so I can print fibre reinforced filaments.
  6. MrCetirizine

    3D Prints

    I bought a new printer capable of printing in all kinds of filaments. Test print in Nylon
  7. MrCetirizine

    Bolt lube

    I'm currently assembling my new 3D printer. So far no lube 😁
  8. MrCetirizine

    Bolt lube

    Some lugs, certainly all of the ones on my rifles have primary extraction built in. This is a very slight, thread like curve to the lugs (though I understand other designs exist) which slightly retracts the bolt as the lugs turn against their locking surface and pulls the case out just enough to break the adhesion you get when the case expands into the chamber walls. It's something that's been in pretty much all bolt action and straight pull rifles since before world war one. If you had to clear the lugs before you could start extraction then you'd have to apply a huge amount of force to pull the bolt back. A stiff bolt lift is typically stiff primary extraction caused by overpressure adhering the case into the chamber more than usual. Here's a video from the brilliant bloke on the range, explaining it. This of course has no direct effect that would either stop or cause galling as the lugs still rub against their counterparts but I still maintain that there isn't sufficient pressure between the two to cause galling if the surfaces are clean. I only mentioned my degree because I was questioned about pressure measurement and effect which I learned a great deal about so I thought it was germane. It's not something I typically ever mention because in truth, it's been 20 years since I used it in anger and as with most sciences, a lot of it has changed.
  9. MrCetirizine

    Bolt lube

    If they had to hammer it open, then it couldn't have been galling as that occurs during movement of metal against metal. If it seized closed after firing then I think no amount of lube or lack of lube would have made a difference. Just a guess without seeing it but my initial hypothesis would be, incorrect heat treatment of the bolt/batch of bolts which would create a softer than required steel that deformed under firing, locking the bolt in place and causing marking on the lugs when hammered open.
  10. MrCetirizine

    Bolt lube

    ?
  11. MrCetirizine

    Bolt lube

    I graduated in 1997 then tried to get post grad work to move towards my PhD but found that theoretical physics was tricky to get into, so I went to work briefly in engineering design, specifically tool heads for deep sea drilling. However, I found that unfulfilling and took some time off before accidentally getting into the print industry, where I've been ever since. I understand what galling is, I simply have never seen it be an issue on bolt lugs that have so little friction and pressure on them that if you remove the firing pin, the bolt will close purely from gravity on the bolt handle. Once fired, the pressure that was present during firing, dissipates completely, leaving the lugs under no pressure again. There will be some extra adhesion caused by the brief pressure impact pressing the faces of the lugs against their counterparts in the barrel/barrel extension. However that will be alleviated with a very slight rotation of the bolt, especially in bolt designs with strong primary extraction. Also, adding lubricant will in fact increase this adhesion in the same way the sucker pads on GPS/Dashcam type devices, stick better to your windscreen if you wet them. I have seen scored lugs caused by grit, which is why I keep mine dry. I have also seen both scoring and galling on the cocking cam/cocking piece, which is why I do lube that.
  12. MrCetirizine

    Bolt lube

    Cool, so BAT actions gall when lubed. I wonder if anyone tried not lubing them and just making sure they're clean?
  13. MrCetirizine

    Bolt lube

    I fell for beard oil £30 waste of time and energy. Maybe I'll rub it on my bolt lugs.
  14. MrCetirizine

    Bolt lube

    OK, I look forward to seeing them. Does he have details of the law suit, insurance claim or internal investigation carried out by the proof house too? It would be nice to see how they dealt with it.
  15. MrCetirizine

    Bolt lube

    If you'd bothered to read the Reddit thread the image was posted in the guy was told that it was the result of galling from not using lube and he replied.. "Thanks for the input, but gun grease has always been applied in that exact location".
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