It’s seen in a number of different applications. It’s often scene on the bolt and other parts of firearms as a decorative touch:Īnd of course, Charles Lindberg’s Spirit of St Louis airplane featured engine turning on the cowl: Here’s a motorcycle instrument pod done by reader Nate: Classic automobiles and hot rods used engine turning as ornamentation.
#Excentro gullochie how to#
How to do engine turning and jeweling of bolts and other partsĮngine Turning is very easy to do, at least in principle. Image via Tin Can Bandit’s Gunsmithing Blog… Typically, you overlap the plunges by half the diameter of your jeweling “cutter”: You take an abrasive of some kind, put it on a rotating brush or buff, and drop it down onto the work in a pre-defined pattern.
#Excentro gullochie software#
Most jeweling is done by hand, often with a drill press, but a CNC machine can make short work of the task and CADCAM software can achieve a perfect layout. Try programming a plunge milling toolpath to achieve the desired effect.įor your jeweling tool, there are a variety of possibilities. You can use a brush or buff with some abrasive compound. Many like to use Mag Wheel Polish as the abrasive. This technique works, but is messy and a bit fussy.įor the brush, a wire brush will last a long time. A method I like better is to chuck up an abrasive stick, such as a Cratex:Ĭratex sticks are just abrasive embedded in rubber. Use with a little WD-40 or other convenient lubricant and they work great. On a CNC, your machine’s normal coolant should be fine–no need to contaminate it by adding oil. I use Cratex sticks quite a lot around the shop, so I bought their big assortment of sizes and grits. But, you can also buy single sticks very cheaply.Įngine Turning, also called Damascening, is a very straightforward process. It’s not hard, but it does require a lot of time and you need to be painstaking about how you overlap the pattern for best effect. I prefer engine turning softer materials like aluminum. Obviously a rifle bolt will be quite a bit harder, so it will take longer.
Here’s a video showing some engine turning with a Craytex stick…Įxperiment with the spacing pattern to create more interesting designs. Perhaps two sizes of circle would be neat? Guilloche, Rose Engines, and Ornamental Turningįine jewellers scoff at the idea of engine turning being “jeweling.” It’s entirely too coarse a method for their needs. Instead, they use a technique called “Guilloche” and a machine called a “Rose Engine” to do Ornamental Turning. BTW, it’s pronounced “Gee-o-shay” and is a French word.
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