Woodworker's Journal 2010-34-2, страница 22
Oneway's six-step locator system provides turners with a fail-proof method for keeping their work centered while transferring it to a vacuum chuck. Properly centering a bowl on a vacuum chuck can be a bit of a trick. Oneway developed a system where you mount the chuck on which you turned the bowl to the tail stock. Put the vacuum chuck in place, then slide the tailstock and bowl down the ways until the bowl contacts the vacuum chuck — it's centered. See photo sequence next page. Try It with a Sphere John turns a number of spheres of various sizes. Previous to acquiring a vacuum chucking system, he hand sanded the ends where they were last attached to the lathe. With the task of hand sanding eliminated, the time it takes John to make and finish a sphere is dramatically reduced. Simply turn a sphere between centers (or by using a variety of other methods). Remove it from the lathe and attach it to a vacuum cylinder. Centering a sphere is a cinch. Because it's already basically round, it self-centers. You can now make finishing cuts and sand the entire ball. Touching Up Your Bowl John travels to a number of craft fairs throughout the summer season, and invariably a finished bowl or plate will get scratched. Touchup is easy with the bowl attached to the vacuum chuck. Select a cylinder that's appropriate to the size of the object, then turn on the system so that it will hold the howl but not hold it too tightly. Move the object around slightly Lo gel it centered. You might have lo turn on your lathe to a slow speed to accomplish this. Once the object is centered, you can lightly sand the surface to repair the damage. Blend the sanded area with the finished area. Reapply finish, either on or off the lathe. Vacuum Chuck Cylinders Cylinders in a variety of sizes for your vacuum system can be made from PVC pipe and O-rings, foam, chamois, or a used mousepad. Attach the PVC pipe to a backing hoard which can be made from any type of lumber, even MDF. If you use foam, don't use a porous foam, as that will make the chucks too spongy, and they won't hold. John keeps Ills cylinders stored with the neoprene side down to avoid the neoprene separating from the cylinder. This neoprene will have to be occasionally replaced, as it doesn't hold up forever with continued use. Various Considerations John has an internal filter in his pump, helpful for keeping dust out of the system. Most homemade systems have inline filter systems. If you are creating a lot of sawdust, you might find it to be a good idea to install an in-line filter, even if you have an internal filter on your pump. A vacuum chuck works by 24 April 2010 Woodworkers Jourruil |
