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The suction supply is a larger input, because this pneumatic has to generate a fairly large degree of force, and do it quickly, in order to lift all the dampers. The top of the pneumatic is connected to the pedal prop rod via a fulcrum lever. When the pedal input receives atmosphere input, it sends a cascading signal to the pneumatic to close, which in turn raises the dampers.<\/p>\n
See diagram from old Standard literature:<\/p>\n Now for the rebuilding. As before, remove old soft materials (unless you can salvage pouches, as in my case), then do your cleaning and sealing.<\/p>\n I will do a post on inside valves separately, that\u2019s a specific topic which covers a fair bit of theory.<\/p>\n The double pneumatic needs a slightly different approach, when recovering. Instead of one pivot point a double pneumatic has two, so the cloth must be first put on one outer edge to the middle edge, then to the other outer edge. Not rocket surgery, really.<\/p>\n The double pneumatic is also double hinged, for strength, as well as spring loaded. You will save a fair amount of trouble if you make an index for your spring holes in the hinge end of the boards. It can just be a piece of acetate or whatever, a \u201cmap\u201d to know where to puncture through the cloth, once the hinge end is recovered.<\/p>\n So once the regasketing and recovering is done, I still need to get these two inside valves sorted to complete the unit; until then I will just set it aside and move onto the next peripheral.<\/p>\n<\/body>","protected":false},"excerpt":{"rendered":" And we\u2019re back! Now that the head is done I am moving on to the peripherals. These are defined as any stand-alone components not directly attached to the main trunk or the stack. In my case this means the pedal pneumatic, the governor, the loud\/soft button control box, and the theme\/ cutout boxes. These last … Continue reading Pedal Pneumatic, and other Peripherals<\/span> <\/a><\/a><\/a><\/a>