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木工:如何制作圆环

2018-2-2 10:35| 发布者: dymodel| 查看: 263| 评论: 0|原作者: sly

摘要: My router didn't come with a circle-cutting jig, so I decided to make my own out of a few pieces of hardware. I started by making a pivot block from a small piece of wood. A short length of ?″-dia. d ...
My router didn't come with a circle-cutting jig, so I decided to make my own out of a few pieces of hardware. I started by making a pivot block from a small piece of wood. A short length of ?″-dia. dowel is glued into a hole in the bottom of the block to serve as a pivot point.
Another hole drilled through the block allows it to slip over a length of 3/8″-dia. threaded rod. A couple of nuts and washers secure the block to the threaded rod (see detail). The end of the rod fits into a hole in the base of the router and is held in place with a machine screw.
To use the jig, first mark out the center of the circle you want to cut and drill a shallow, ?″-dia. hole for the pivot pin of the jig. Then slide the block along the threaded rod to match the radius of the circle and lock it in place with the nuts and washers.
To rout the circle, first drill a starter hole at the edge. Then lower the router bit into the hole and rout the circle in multiple passes, lowering the bit ?″ between each pass.

How to make circular rings.  I bought a threaded steel rod, an eye bolt, and four hex nuts at Home Depot for less than ten bucks.  I attached the steel rod and eye bolt to my router, allowing the router to rotate in a circular motion.  The eye bolt is adjustable allowing you to create different size circles.  (See pictures below).
Note: these pictures were taken before I cut the rings.  But you'll get the ideal.
Router assembly with threaded steel rod and eye bolt.

Close-up view of the threaded steel rod attached to the router.  The eye bolt is adjustable to whatever radius you determine.  A hole was drilled and the eye bolt inserted in the center of the circle, allowing the router to rotate in a circular motion.  Tighten the hex nuts with a wrench before cutting your circles.  Any loose connections and your circles will be out-of-round.  Also secure your mdf boad before cutting.  I secured my mdf board by screwing it down to an old speaker box.  Place at least one screw next to the eye bolt and another outside the outer ring of your circle so the mdf board doesn't  move.  And now your ready to start cutting.  Wear safety glasses and a respirator, you'll be creating a lot of dust.


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