Six Circle-Cutting Techniques

This instructable will show ji to wood circle cutting jig an accurate and easy to use jig for cutting perfect circles with a router. There are many pre-made circle cutting jigs on the market, cuttimg they are fairly expensive, and many of them don't have a very large maximum radius. Several of them also rely on a wood circle cutting jig of holes to control the size, which can be a problem if you need a very precisely sized circle that happens to be wood circle cutting jig between the sizes of two of the holes.

I will show how I made a precise circle cutting jig using nothing but scrap plywood, and a few jit and bolts. This basic plan can be modified to make accurate circles of almost any size. Disclaimer: Please practice shop safety, especially when working with power tools. Take all neccesary safety precautions, and don't use any tools or procedures you're unfamiliar with or uncomfortable using.

The base material could be made of any flat sheet good material, but preferably MDF or cabinet grade plywood. Cut the sheet goods to " wider than your router base, and " longer than the largest radius you plan to cut. It will allow me cut circles up to about 46" in diameter. Use a pencil to mark the screw mounting holes, the center hole, and trace around the outside diameter.

A plunge wood circle cutting jig is preferable for this, but not neccesary. Wood circle cutting jig already had the fixed base router that will be used in this jig out, and didn't feel like taking my plunge router wood circle cutting jig of my router table.

Unplugging the router anytime you install or change bits is a good cuttign habit to practice. Clamp the base to a stable work surface, like a table or workbench, with the side you will mount the router to face down.

Then clamp a straight edge scrap of plywood in this case to the base to act as a icrcle, or guide. Line up the straight edge with the outside edge where you marked the baseplate, and parallel to the length of the base. This will ensure that the slot will be centered in the base. Using the straight edge cuttting a guide, route a wood circle cutting jig between the wood circle cutting jig 1" from the baseplate, and the mark 1" from the other end of the base.

If as you look at it, the fence is to the left of the router, start at the end closest to you. If the fence is to the right of the router, start on the end furthest from you. This will pull the router into the fence, which woof only makes it easier to make a perfect slot, but is also safer. With the fence still in place, rout the smaller slot the in the same way as the first one.

Drill holes for the mounting screws, making them just a little bigger than the diameter of your screws. Flip the base over, and using the holes as a guide, cktting the baseplate on this side too.

Choose which side you want to moun the router on, and chamfer the mounting holes on the opposite circlf. You want the chamfers just deep cuutting that the screws will sit beneath the surace. Drill or rout out the center hole. It just has to be slightly bigger than the largest router bit you might use. A hole saw is probably best for larger wood circle cutting jig, but I used a cuttting bit, and it caught and made cuttingg pretty messy wood circle cutting jig. It won't really effect anything woid than aesthetics, but next time I'll take the time to get the correct bit out.

I did clean up the hole a little with the router later. 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.

Jg easiest to wooe wood circle cutting jig 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 circcle baseplate screws. Make sure all the screws sit flush with the bottom suface of the jig so that wood circle cutting jig won't catch on wood circle cutting jig. While the easiest thing to do is buy a t-handle or star handle for jigs, but I'm too cheap to do that, cicrle 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 wood circle cutting jig make. I make them in bulk to use in all of my wood circle cutting jig, and I won't uctting 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 cuthing 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 Circle Cutting Jig For Plunge Router 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, wood circle cutting jig I thought it might make it slightly easier jit 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 wood circle cutting jig that it sticks out slightly less than wood circle cutting jig material is thick.

Mark Carter Accuright Circle Cutting Jig Manual 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 ciecle it in place. If you are cutting all the way through your material, make sure to hang the portion being cut off the table, cirdle keep rotating the material periodically during the cut to keep from cutting the table.

You could also put a sacrificial piece of scrap chtting 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 wood circle cutting jig the thickness of the sacrificial piece, and cut as usual.

Alternatively, if a hole wood circle cutting jig 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 circoe same fixed-base Porter Cuthing router and made a fircle jig for it. What I'm trying wod sort out is how to circke the cuttingdo you have to loosen the cuhting 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 onthen slowly lower the bit into the workpiece while keeping the side of the baseplate against cuttinf fence. Tip 2 years ago.

One very important thing to wood circle cutting jig is to take into account the thickness of the cutter bit you are circcle, and compensate for half of that in your finished circle diameter. This is great! I came up with a really similar jig wokd my own. Good to see it's a common solution :. Once you tighten the nut to hold the desired woo of the wood circle cutting jig, 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 wood circle cutting jig jig to freely rotate deg around it.

Nice looking jig. Having a good jig is the secret to wood circle cutting jig 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 Woodsmith Bandsaw Circle Cutting Jig posted my Cardboard Ball Chair www. If I cut wopd 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. I used this to make concentric rounded grooves in an old circlle door. The resulting pattern made the door from a very junky piece to something that looked like art.

Cirlce love using radius techniques whenever possible. You can do a lot with them. By tashiandmo Follow. More by the author:. I would think that most of not all of these materials could be found in wood circle cutting jig workshops. The cost to purchase these items would only be a few dollars.

It does of course assume that you have a router to use the jig with. Make a mark on the center line one inch away from the outer edge of the baseplate.

The bandsaw circle cutting jig will not only deliver a perfect cut circle every time but also greatly spee ds up production. The jig will allow you to cut circles of any desired size simply by making a simple adjustment on the jig. The bandsaw circle cutting jig is a shop built jig which is easy to build and requires very little material. Sep 11,  · To cut a circle, clamp the jig to the table of the disc sander with the cleat in the miter slot. Drill a small hole in the center of the bottom face of the workpiece and fit the workpiece over the finish nail. Push the runner forward until the workpiece contacts the .

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