The Birth of a Handslide
Learn more about Getzen slide production by viewing our factory videos.
Have you ever wondered how we earned the reputation of manufacturing the finest trombone handslides? It took years of experience, extremely high standards, and countless hours of handcrafting. Weâ€™ve also thrown in a few trade secrets for good measure. It’s a process that has taken decades to perfect and now you can get the inside scoop on exactly how itâ€™s done. Just keep it between us.
Step 1: Proper Material
This is where it all begins. In order to end up with quality finished products, you have to start with quality raw materials. We use only the finest nickel silver tubing available for our inside slides. The raw tubing is milled to our exacting standards and to our precise specifications. Each piece of tubing is inspected before use to ensure there are no inclusions or other imperfections in the tubing. Even the tiniest nick will spell disaster later on down the road.
Step #2: Drawing
After inspection, the raw tubing has to be drawn down to the proper size. This is the trickiest part of the process. If the tubing is not drawn correctly the finished pieces will be curved or “banana-ed” as we call it. If this happens, the tubing is thrown out and we start over again. As the tubes are drawn they are inspected in batches to ensure they are up to par. This may sound wasteful, but if you don’t start straight, you won’t end up straight and that is the key to a smooth slide.
Step #3: Straightening
This is the first time the tubes make their way to our slide room for treatment. Each drawn tube is hand checked for straightness. This is done using a large piece of flat steel and a backlight. When a tube is placed on the steel plate any light that shows between the tube and the plate indicates a tiny bend in the tubing. These bends need to be removed and are “massaged” out by hand. A time consuming practice that takes years to master.
Step #4: Plating & Buffing
After being straightened, the loose tubes head back to the plating room for a healthy layer of chrome plating. This creates an incredibly hard, durable, and slick surface. Hard plus durable plus slick equals years of lightening fast, trouble free action. From there, the tubes make a stop in the buffing department where each is polished to a high shine. This is done to reveal any surface imperfections as early as possible, when the tubes can still be easily repaired or replaced.
Step #5: Mounting
This, like every step before it, is crucial to ensuring a top quality handslide. The slide tubes and other parts are mounted together using special fixtures designed to hold the various parts of the slide square and true while the mounter solders them together. It is very important to be certain that all parts fit together correctly with as little tension as possible. No matter how well the individual parts are built, they are useless if not put together just so.
Step #6: Straightening, Part Two
That’s right, after all the pieces of a handslide are put together, they head back into the slide room for a second visit. This is to true up both inside and outside slide assemblies. Both are checked for absolute straightness using the same technique mentioned earlier. However, this time a specially ground granite block is used instead of the steel plate. The granite is ground, polished, and measured to be as flat as humanly possible guaranteeing a perfect straight edge for creating perfectly straight slides.
Step #7: Slide Prep
After the second straightening, outer and inner slide assemblies are paired together before undergoing slide prep. The outside assembly is treated with a process known as trip and lap. Basically, a two step technique that polishes the inside of the tubes to a mirror finish. The smoother the better. Both inside and outside assemblies are then cleaned. The final prepping step involves lubricating the slide and giving it a final check for proper action. The slide is then corked and stored in the slide room until needed.
Some Secrets Revealed
Specially designed mandrels\dies are used only for drawing slide tubes. While more expensive than standard mandrels\dies, these precision tools draw much straighter tubing. 2) Before plating, each inside tube is barrel shaped at the stocking end. This reduces the amount of metal on metal contact between the inner and outer slides resulting in less friction and smoother action. 3) At the end of the prep stage, inner tubes are sprayed with non-aerosol Pledge furniture polish. This creates a thin layer of lubrication without any build up. Best of all, as the Pledge dries it can be easily reactivated with a simple spray of distilled water.