Setting up for more marimba resonators

Time to turn this large crate of tubing into 100 resonator tubes for marimbas. The tooling is so large and heavy that it takes a scissor lift to get it on the machine even in pieces. The sizes are 3.5″ OD tube on 8″ centerline, 4″ OD tube on 8″ and 10″ centerlines. The tubing is 6061 aluminum annealed to a very soft temper. The tubing is so soft that the challenge is to hold it in the clamps without crushing or even marking it.