Popular Woodworking 2005-08 № 149, страница 95
Mounting with a Glue Block and Chuck This is a good method if you own a chuck, but your workpiece is not very thick. If you mount the piece using a recess that is too shallow, the jaws of the chuck may break the piece when they are expanded to hold it, or the workpiece may simply be pulled off the chuck as you turn it. But a deeper recess would use up too much of the thickness of the wood; you don't want to lose any depth in the finished piece. Here the waste block (or glue block) has been glued to what will be the bottom of the workpiece. I use thick cyanoacrylate glue. Apply glue to one surface, accelerator to the other and twist together. Waste block The waste block and the bottom of the workpiece are then turned together. Cut a straight shoulder (or a slight dovetail, depending on the jaws of your chuck) on the waste piece for mounting in the chuck. (Here I have cut a recess to indicate that you could also mount the piece by expanding the jaws into it, if desired. You would be using one method or the other, not both; your glue block should have only a shoulder or a recess. Always remember: When mounting by expansion of the jaws, the recess must be as deep as possible and the collar of surrounding wood as wide as possible, so the wood will not split.) You should complete the bottom of the workpiece, including sanding and finishing; you won't want to work on that side later with the jaws of the chuck spinning so close. Mounting with a Glue Block and Faceplate / »«» r Another way to turn using a glue block is to mount the waste piece on a faceplate, then glue the workpiece to the waste block. Round the glue block, and turn the outside and inside on this one mounting. It can be more difficult to work on the back like this, but for smaller pieces it works well and eliminates the need for a second mounting. Larger, flatter pieces are much more difficult to turn this way; they are best done as described above. (The extra time for the second mounting is made up for by easier access when turning the bottom.) — JD popwood.com I 93 |
