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best-router-circle-jig-reaction It won't really effect cirlce other than aesthetics, but next time I'll take the time to get the correct bit out. The video below shows what I mean. Did you make this project? Now, plunge the router so that best router circle jig reaction centering pin slips through the hole in the centering disk. If you have an account, sign in with your email address.

You can use the Model to make circular disks, such as small tabletops, but you'll need to account for the diameter of the router bit more on that later. The scale on the Model Circle Guide is for cutting out holes at a given diameter. Click to view a larger image. The first, and most obvious, thing to know is the diameter of the cutout you wish to make. You look at the bottom of the printed scale for the whole number of inches, which is 8" in our case.

Where the two lines intersect is the center of the circle and where the pivot pin will be located. It's that simple! The process I just described creates a circular cutout or hole at the diameter chosen for the pivot hole value. If you want to create a disk a specific diameter, you need to use just a little bit of arithmetic.

All you do is add twice the bit diameter from the desired hole size. This tells you where to locate the center pin on the pivot hole scale.

The scale on the Model Jasper Circle Guide was primarily designed to cut out larger disks, such as round tabletops. Finding the correct pivot hole location works the same as on the Model To create cutouts instead of disks with the Model , the pivot hole location will be the desired diameter of the cutout minus twice the bit diameter.

For cutting out a tabletop where you don't want the hole to show in the finished piece, simply drill a blind hole on the underside of the workpiece. What if you don't want to drill a hole into the workpiece? There's an easy solution: Use spacer blocks. Then attach a couple squares to the bottom of the Circle Guide, positioning them under the router.

The video below shows what I mean. Once the pivot hole is drilled, all that's left to do is position the Circle Guide over the pivot pin at the correct location. But before you start routing, place a sacrificial backer board under the workpiece so you don't accidentally rout into your workbench when cutting out the circle.

I like to attach the workpiece to the backer board with double-sided tape. Make sure the entire assembly is secure before routing. Continue lowering the bit to make several passes until you just cut through the workpiece. That's it! Using the Jasper Circle Guides makes routing perfect circles quick, easy, and accurate!

Setup The Jasper Circle Guides replace the baseplate on most routers we recommend using a plunge router. Understanding the Circle Guide Scales The key to cutting precise circles and cutouts is in the scales printed on the Circle Guides. Share this: Tweet. Posted By: Randy Maxey.

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The mounting screws are most likely much too short to reach all the way through the base material. We could buy longer mounting screws, but unless you have a set of really long router bits, the thickness of the base may limit the depth of cuts you can make with the finished jig.

To solve both problems, I reccomend routing a recess in the base for the router to sit down in. After clamping the base to a work surface with the router mounting side up, rout out the baseplate area, using the line you traced as a guide. It's easiest to start at the center and work around the the hole clockwise, sneaking up on the final size with a few light passes. Now the baseplate can be removed from the router, and the router can be installed in the jig using the baseplate screws.

Make sure all the screws sit flush with the bottom suface of the jig so that they won't catch on anything. While the easiest thing to do is buy a t-handle or star handle for jigs, but I'm too cheap to do that, so I make my own. It takes a piece of scrap wood, a t-nut which costs just a few cents, and takes just a few minutes to make. I make them in bulk to use in all of my jigs, and I won't go into the process here.

It's easy enough to simply cut out a shape you like, drill a hole in the center to accept the t-nut, and hammer it in place. I didn't have any threaded rod, so I just cut the head off of a 3" bolt. Screw the nut onto the center of the threaded rod, and then place the washer on. Slide the portion above the washer up throught the slot in the base, and then screw the handle on to the top. Alternatively, if you have access to a metal lathe as I do, you can cut the threads off one end of the threaded rod, making a smooth post of a specific size.

That way you can use a drill bit that matches the specific size, and always be sure to have a nice tight fit. The threaded rod with an appropriate sized drill bit should work well enough for most applications though. This step is entirely optional, but I thought it might make it slightly easier to use. The base had quite a bit of uneccesary wood, so I decided to cut it off, and round the corners.

I also slightly beveled the edges on the bottom side with some sandpaper so that they wouldn't catch on anything as they slide around the circle. The first step to using it is setting the post height. Measure the thickness of the material you'll be cutting a circle in.

Adjust the nut on the post so that it sticks out slightly less than the material is thick. Mark the center of the planned circle, and drill a hole that the threaded rod post will fit in snugly. Set the post at the desired distance from the router bit, and tighten the handle on top to lock it in place. If you are cutting all the way through your material, make sure to hang the portion being cut off the table, and keep rotating the material periodically during the cut to keep from cutting the table.

You could also put a sacrificial piece of scrap underneath the material instead. It's generally safer and easier to cut outer edges of circles in a counter-clockwise direction, and inside edges clockwise. If you don't want a small hole in the cener of whatever you're cutting, you can use a sacrificial piece on top. Drill a hole in a piece of scrap, and use doublesided tape to secure it to the workpiece with the hole at the center of where you want to cut the circle.

Then just increase the depth of cut by the thickness of the sacrificial piece, and cut as usual. Alternatively, if a hole would be acceptable on the underside, but not on top, you can drill the hole only part way through the material, and cut from the bottom. Have fun, and be safe! I have the same fixed-base Porter Cable router and made a circle-routing jig for it.

What I'm trying to sort out is how to start the cuttingdo you have to loosen the router height adjustment while it's running and rotate it down to the depth you want and re-tighten? I probably should just use my plunge router, I guess! Reply 8 months ago. Reply 2 years ago.

Don't ever loosen or attempt to adjust the depth while it's plugged in, let alone running. A plunge router is safer, but it can be done easily without one. Set the depth with the router un-plugged, plug it in, turn it on while holding it securely it will jump a bit when you turn it on , then slowly lower the bit into the workpiece while keeping the side of the baseplate against the fence.

Tip 2 years ago. One very important thing to remember is to take into account the thickness of the cutter bit you are using, and compensate for half of that in your finished circle diameter. This is great! I came up with a really similar jig on my own. Good to see it's a common solution :. Once you tighten the nut to hold the desired size of the circle, it seems like you will be tightening the fixture to the work piece making it hard to go around.?

Reply 5 years ago. What none of the pictures show is the post that sticks down from the jig under the t-handle. When you tighten the t-handle you are only tightening the post into position. The post then will drop into the hole you drill in the center of your workpiece and allow the jig to freely rotate deg around it.

Nice looking jig. Having a good jig is the secret to most of my successful projects. I use this circle cutting technique frequently, but I just take a long strip of fiberboard and set it up for a fixed radius.

I just posted my Cardboard Ball Chair www. If I cut a lot of circles of various sizes I'd certainly make a jig like this. The all-thread allowed for very precise adjustments and long radii.

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