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  1. #1
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    Default Bottle Jack Pressure Gauge

    I知 fitting a pressure gauge to a bottle jack with 1/8 and 1/4 BSPP fittings and was wondering what to use to seal the threads? I also need the gauge to pull up on the threads in a certain spot (at an angle) so that it clears the body of the jack, I知 thinking copper crush washers?

    any thoughts?

    cheers48832905-1B29-473C-A936-3F788862A27B.jpg

  2. #2
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    Some sort of liquid style hydraulic sealant such as loctite hydraulic sealant.

    There are other brands of hydraulic sealant as well. Any of them will work.

    I would avoid the use of Teflon tape.

    Simon

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    Girl, I don't wanna know about your mild-mannered alter ego or anything like that." I mean, you tell me you're, uh, super-mega-ultra-lightning babe? That's all right with me. I'm good. I'm good.

  3. #3
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    What mods did you have to make to fit the gauge

  4. #4
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    Quote Originally Posted by China View Post
    What mods did you have to make to fit the gauge
    Not many, all I had to do was drill and tap a blind 1/8 BSPP thread in the side of the jack with a small (I chose 4mm) pilot hole that extends deep enough into the jack body so that I could drill down perpendicular in the cylinder until I met up with it,

    All I have to do know is fit it all together

    Edit to add: now that I know the surface area of the piston, and having the pressure gauge, I can calculate the actual pressure being applied

  5. #5
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    I don't think copper crush washers would work as the oil would still go between the threads. Unless you're talking about having a flat bottom in the bore and putting a crush washer in there before you screw the male threaded part down on it (not really possible if you have to adjust the position by not screwing it in fully).
    Since its parallel thread, I'd use a lock nut to lock the position, and some thread sealant as Simon suggested.

    I'm guessing you've done the calcs, but I'd have expected a jack to be higher than 1400psi (not that I've ever tested or modified one so likely have NFI!! ).

    Steve

  6. #6
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    Quote Originally Posted by OxxAndBert View Post
    I don't think copper crush washers would work as the oil would still go between the threads. Unless you're talking about having a flat bottom in the bore and putting a crush washer in there before you screw the male threaded part down on it (not really possible if you have to adjust the position by not screwing it in fully).
    Since its parallel thread, I'd use a lock nut to lock the position, and some thread sealant as Simon suggested.

    I'm guessing you've done the calcs, but I'd have expected a jack to be higher than 1400psi (not that I've ever tested or modified one so likely have NFI!! ).

    Steve
    Hi Steve,

    The elbow and the 1/8 to 1/4 both pull up nicely where I need them, it値l just be a matter of sealing the threads there,

    I like the idea to use a lock nut, since I already have the tap
    the fit between the gauge and the elbow is a bit loose so I think a lock nut and some sealant is the way to go.

    I purchased that gauge because it is within the working limits for what I値l be using it for, if I ever need to go higher I値l grab another gauge, but actually I might beed to go smaller with finer graduations, the eBay picture of this gauge had 20psi increments which is what I really needed

  7. #7
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    All good. I壇 done a back of the hand calc with a 50mm diam piston and 8T is roughly 5000psi.

    So you値l be good for at least 2T

    Yeah - it痴 a bugger when the eBay image isn稚 what the actually send

    Steve

  8. #8
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    I can't quite tell from the photo, but are those fittings brass? If so I'd advise swapping them out for steel fittings as 1400PSI is stretching the friendship for brass elbows etc.
    As far as sealant goes, Loctite hydraulic sealant of an equivalent is the way to go.

  9. #9
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    Quote Originally Posted by Karl Robbers View Post
    I can't quite tell from the photo, but are those fittings brass? If so I'd advise swapping them out for steel fittings as 1400PSI is stretching the friendship for brass elbows etc.
    As far as sealant goes, Loctite hydraulic sealant of an equivalent is the way to go.
    I was thinking the same thing.

  10. #10
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    Quote Originally Posted by Karl Robbers View Post
    I can't quite tell from the photo, but are those fittings brass?
    Yeah they are, I won稚 be pushing the full 1400psi on the dial so I知 not too worried, but I will order a BSPP die so I can make up fittings if these look like they might fail, but they値l do for now.

    No body parts will ever be under this jack while under load anyway

  11. #11
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    Quote Originally Posted by NedsHead View Post
    ... if these look like they might fail...
    Mmmm, how does a brass elbow warn you it's about to fail?
    Chris

  12. #12
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    Quote Originally Posted by jack620 View Post
    Mmmm, how does a brass elbow warn you it's about to fail?
    *Look like they will be used at pressures that will cause them to fail

  13. #13
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    I don't know exactly what you are doing and the pressures that may be involved, but I will say this. Brass fittings are normally designed for pressures sub 300PSI (yes, there certainly are some that are designed for pressures of several thousand PSI) and while I acknowledge that you said that there will be no body parts in danger of being crushed, oil at even 500 PSI has the potential to do serious damage in the form of fluid injection injuries, eye injuries and even ingestion if it should squirt in your mouth. Rated steel fittings aren't overly expensive and are readily available. Personally I'd not entertain the idea of using non hydraulic fittings for what you are doing, but you may have covered your bases and my comment may well be superfluous.

  14. #14
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    Quote Originally Posted by Karl Robbers View Post
    I don't know exactly what you are doing and the pressures that may be involved, but I will say this. Brass fittings are normally designed for pressures sub 300PSI (yes, there certainly are some that are designed for pressures of several thousand PSI) and while I acknowledge that you said that there will be no body parts in danger of being crushed, oil at even 500 PSI has the potential to do serious damage in the form of fluid injection injuries, eye injuries and even ingestion if it should squirt in your mouth. Rated steel fittings aren't overly expensive and are readily available. Personally I'd not entertain the idea of using non hydraulic fittings for what you are doing, but you may have covered your bases and my comment may well be superfluous.
    Appreciate the advice

    I'll switch out the brass fittings for rated steel ones once I have it all together and know that it's working, for now I'll load test to a couple of hundred PSI since I have the brass fittings anyway

  15. #15
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    Frame painted and pretty much done.


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