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Thread: Bottle Jack Pressure Gauge
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18th Aug 2021, 11:26 PM #1Golden Member
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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
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19th Aug 2021, 07:33 AM #2Most Valued Member
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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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19th Aug 2021, 01:28 PM #3China
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What mods did you have to make to fit the gauge
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19th Aug 2021, 01:51 PM #4Golden Member
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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
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19th Aug 2021, 05:30 PM #5Most Valued Member
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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
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19th Aug 2021, 06:17 PM #6Golden Member
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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
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19th Aug 2021, 06:59 PM #7Most Valued Member
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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
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19th Aug 2021, 07:50 PM #8Most Valued Member
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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.
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19th Aug 2021, 09:27 PM #9Diamond Member
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19th Aug 2021, 10:06 PM #10Golden Member
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20th Aug 2021, 04:24 PM #11Most Valued Member
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20th Aug 2021, 05:16 PM #12Golden Member
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20th Aug 2021, 05:47 PM #13Most Valued Member
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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.
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21st Aug 2021, 11:19 PM #14Golden Member
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2nd Sep 2021, 08:15 PM #15Golden Member
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Frame painted and pretty much done.
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