08-27-2013, 10:19 PM
Thanks Dave,
Incidentally the correct answer and the imaginary $64,000 goes to Steve, the bottle jack does not work upside down. In fact the most common design for bottle jacks has the oil reservoir being the "bottle" shaped jacket around the central core / hydraulic cylinder, the oil supply to the pump is usually a hole drilled in the base plate usually at the back of the reservoir(the opposite side to the release valve), as a result bottle jacks usually work only in the upright position or lying down in such a way as results in the pump handle being vertical.
In this case I need the press for a metal forming job for which the dies need to mount to the underside of a flat plate, so the base of the bottle jack will work fine.
The 6" ram has a 2" shaft that will be able to take adapters as suggested.
Incidentally there are ways to make a bottle jack work upside down, one method is to simply tap the oil feed port in the back of the base plate and screw in a tube that extends right up to the top of the reservoir, when inverted the top becomes the bottom, while this does work it is unreliable as the pump can easily lose it's "prime".
A second more reliable method is to add a second reservoir to the system that is located above the base plate and holds enough oil to feed the pump throughout the lift cycle.
We used to use both methods on various pressing and pulling jigs we used at the steelworks when I was an Apprentice.
Regards
Rick
Incidentally the correct answer and the imaginary $64,000 goes to Steve, the bottle jack does not work upside down. In fact the most common design for bottle jacks has the oil reservoir being the "bottle" shaped jacket around the central core / hydraulic cylinder, the oil supply to the pump is usually a hole drilled in the base plate usually at the back of the reservoir(the opposite side to the release valve), as a result bottle jacks usually work only in the upright position or lying down in such a way as results in the pump handle being vertical.
In this case I need the press for a metal forming job for which the dies need to mount to the underside of a flat plate, so the base of the bottle jack will work fine.
The 6" ram has a 2" shaft that will be able to take adapters as suggested.
Incidentally there are ways to make a bottle jack work upside down, one method is to simply tap the oil feed port in the back of the base plate and screw in a tube that extends right up to the top of the reservoir, when inverted the top becomes the bottom, while this does work it is unreliable as the pump can easily lose it's "prime".
A second more reliable method is to add a second reservoir to the system that is located above the base plate and holds enough oil to feed the pump throughout the lift cycle.
We used to use both methods on various pressing and pulling jigs we used at the steelworks when I was an Apprentice.
Regards
Rick
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