How to Cut Circles With a Router - This Old House

JavaScript seems to be disabled in your browser. You must have JavaScript enabled in your browser to utilize the functionality of this website. You need to ensure you are using the correct accessories if you use any of the jigs available for routing applications. You should check the instructions with individual jigs for precise guides to which bushes and cutters should be used and how exactly the router should be operated when using the jig.

You particularly need to pay attention to the cutter and guide bush you use as this will affect the distance between where the cut is being made and the edge of any jig or template. This distance is known as offset and needs to be taken into account for the cuts to be accurate.

Details on offset below. You will also get details of the thicknesses and types of material which are suited to each application, for example, worktops are usually made from laminated and resin bonded chipboard.

This needs specific cutters as it is a highly abrasive material which will blunt standard cutters very quickly. Deep cuts will need to be made from a series of shallow passes and you router jig round hole transfer to make sure the router is guided along the Router Jig Round Hole Kit edge of the jig at a constant, optimum, speed, without forcing the router, to ensure the waste material clears cleanly.

The offset is the difference between the edge of any jig or template and where the cut will actually be made when using a guide bush. Most jigs need to be used with a guide bushbut some, more basic, templates may just require a guided cuttersometimes known as a pilot cutter, which would not have any offset and will produce a router jig round hole transfer which is the same size as the template.

The offset depends on the combination of guide bush and cutter being used. There is a simple calculation you can use to work out the offset. Take the diameter of the guide bush's collar router jig round hole transfer, subtract the diameter of the cutter which is the distance between the outside of the cutting edges, rather than the diameter of the cutter's shaft Router Jig Round Hole Gateway and half this.

This is how far away from the edge of the template the cut will be made. When routing out holes or other openings, following the inside edge router jig round hole transfer a template, this is how much smaller the hole will be compared to the template outline.

When routing out shapes, following the outside edge of a template, this figure is how much larger the cut out shape will be compared to the template. Below is a simple chart displaying the offset that will occur when using particular sizes of guide bush and router cutter.

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What is router offset? How to calculate the offset Take the diameter of the guide bush's collarsubtract the diameter of the cutter which is the distance between the outside of the cutting edges, rather than the diameter of the cutter's shaft and half this. Chart for guide bush offset and formula Below is a simple chart displaying the offset that will occur when using particular sizes of guide bush and router cutter.

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