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| rdhem2:
Any of you guys out there have a good design for a cable lift system for the table on a hydralic press. I have an idea for the crank and gearing but need some ideas for the routing of the cables. Leaning towards using very flexable .125" or .1875" aircraft cable with crimp type fittings. Always searching for better ideas. I usually find them when I am about 75% finished on a project. :ddb: |
| Lew_Merrick_PE:
RD, How much does/will your "table" weight? That is going to be one factor. Take a look at an old cable-driven parallel beam drafting set-up. The cables held the drafting beam "horizontal" to the table and assured that it moved in a (reasonably close to) parallel manner. Many of them had the "equalizing" cable path cross behind the drawing board, but several of them had the cable run along the sides of the board which would be more to your liking for this application. When I close my eyes and visualize it, I see six pulleys on the cable run and half-a-dozen or so "turns" on the capstan. Does this help? |
| DaveH:
Might be something here could help? http://www.metalworkingfun.com/showthread.php?tid=163 :beer: DaveH |
| rdhem2:
Lew; Thanks, I know what you are talking about but it has been years since I've seen one. My drafting arm now has everything hidden in double tubes to each pivit so I know not what magic it contains. If I get real desperate I may have to perform an autopsy! Only difference here between me and a Doctor is mine has to work again after I put it back together. :thumbup: As far as weight probably in the 150 lb range, the press frame it's self is rated for 50 ton. |
| rdhem2:
DaveH; Thank you. Cruised your offering and picked up an idea or two. Hope I can explain my idea in a fashion that is comprehensable. If I make each side independent so to speak with a take up spool/reel on each side would the difference in diameter as the cable winds up to capacity be enough difference to be a problem? Each side identical with a common drive connection so each turns the same. After all some tilt would be OK as we are only lifting to clear the pins and then setting it back down. Just so it does not jam or hang. Little late for a redesign at that point. Or One take up spool with a pulley setup so all four corners lift the same. Or so it says in the fine print. The only down side to this idea is the cable crossing the opening of the press. DaveH, not knowing all things pertenent I still have to ask. I am a history buff from way back. Reading a lot of Winston Churchill and his efforts early in life. You being from S. Africa. Are you what they refer to as a Boar? One from Dutch decent? One of those guys who used Mauser magazine rifles while the Brits tried to keep up with single shot Enfields. They were saving the King money you know. Just curious. :doh: Have a good day |
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