"Ted Frater" wrote in message
...
chips-'n-swarf wrote:
How does one go about putting a gauge on a
bottle jack. Or, where can a bottle jack with
gauge be purchased. Here's a photo -
http://www.granthams.com/jack/BottleJack.jpg

Any suggestions are appreciated.

Thanks

Rod
When fitted a pressure gauge will register the fluid pressure, which may
not be the pressure exertedby the ram. for example, 100 psi on a 10 sq in
ram will give you 1000 lbs lifting/ pushing energy,not 100 lbs.
so youll need to make some calculations to relate pressure to lifting
ability of your setup.

You will also need to allow for the friction in the seals. You may think it
will be negligible for lubricated rubber, but it won't. ISTR the actual
force might be 20% lower than the calculated.