Removing dents from a brass trombone
Quote:
Originally Posted by
BaronJ
Hi Wooly,
Can you solder a pair of small brass washers to the inside of the lever ?
That's a good idea Baron. It would save having to fill the big hole worn in the water key while providing a support for the sleeve that goes through the key and touches the support posts. I know that everyone wanted a picture of the water key assembly but my sketches are a bit difficult to decypher at the moment. I had another idea about how to remove dents from the trombone tube 7 inches away from the bell. Point 1: the force required is outward, at right angles to the sac but's axis. Point 2: to generate this force requires the input force to be virtually along the axis of the tubing ie down the trombone's throat. What device does this? A car jack of course. But the internal width (dia) of the tube at this 7 inch point is only 30mm so it would have to be a very small car jack. I considered using a hydraulic or pneumatic ram for this but I couldn't buy anything small enough. So what about using a nut and bolt? The expansion is outward as required and the input is down the throat of the trombone using spanners on the hexagon head of the bolt and the nut. There isn't much room for turning the hexagons when inside the 30mm space but I reckon it could be possible, After all, the expansion of the nut and bolt assembly only needs to be 2 to 3 mm, the depth of the dent. Another idea that came to mind is the use of a worm thread whose axis lies parallel to the main trombone tube's axis. The worm could be made to push its mating screw outward. But the nut and bolt is simpler. I have already removed the big dent in my slush pump as I described elsewhere on this forum so I'm keeping the nut and bolt idea in my pocket for another time. In case anyone didn't know, a sac but and a slush pump are alternative names for a trombone.