In 1260 (pt1), I looked at all the work I had to do before I could even start looking at the reason why this Premier 701 vibraphone had come in to be repaired.
Having fixed all the issues with the frame and therefore I have an instrument that doesn’t continually change shape, I can put the notes on and define a centre line for the damper bar.
There are several different approaches used to control the movement of a damper bar; this system that I am making is my favourite. It has the fewest number of parts to make, which means that it is quicker and cheaper to fabricate. This also means that the tolerances (manufacturing discrepancies) don’t add up and become too great. But above all that, it is the system that seems to go wrong the least number of times.
What I should say, is that I have no intention of replicating the system made by Premier and used on their 701 and 751 vibes. The Premier design is actually quite neat, but it doesn’t really work very well, has an Achilles heel, and all the spares are now obsolete.
Back to the vibraphone. Now that I know where the damper bar needs to be, I can make the levers around which it will rotate. All of the manufacturers who use this system, fix the levers to the damper bar with screws. I have used very thin wall steel instead of aluminium, so I have chosen to weld them on in position and have fewer parts to go wrong and end up with a more resilient design. This is one major reason for choosing steel over aluminium, the other is that it is stronger. Yes it is very slightly heavier than the aluminium the manufacturers use, but when that is substituted for aluminium stock that doesn’t bend in use, the thicker walled aluminium actually weighs more than the steel. This is a common misconception about aluminium.
The connection rods between the damper bar and the pedal are always a bit tricky, both in design, where there is always a compromise, and in application. The design problems are mainly concerned with ease of use when the vibraphone is being transported. The issues in application are that they want to fall down towards the pedal exactly where the motor sits. Therefore the positioning is also a compromise. The actual method I use are simply tubes that have a telescopic rod that connects to the pedal. This will be seen in 1260 (pt 3) when all the bits are back from the powder coaters and chrome platers.