Dremel678 - Circle Cutter and Straight Edge Guide Rotary Tool Attachment - Fits Dremel Models 4300, 4000, 3000 and 8220

This little jig was probably the best tool purchase I've made in the past 5 years. I am making a replacement baffle for my 4x12 speaker cabinet and I was struggling with how to cut 4 perfect circles in a piece of 5/8' particle board. I have a router but I would have had to make a jig or buy a very expensive one, but then I came across this. I have a Dremel tool and this was perfect since it cuts up to 12", which is just about the size I needed.Yes, I had to make multiple passes and lower the bit each time, but it was well worth the extra time and patience. It was also a bit wobbly at time but if all your doing is making a rough circle, you don' even notice. I wish doing all other tasks were as easy as using this awesome jig. And at under $9, you cannot beat that price at all. Excellent accessory to a Dremel tool and I would recommend this to anyone who is looking for a small-scale circle cutting jig. Well worth the time and money. You can see the results in the photos. Can't beat that.

Take your time and you will create great circles with this product.

I used this with my Harbor freight rotary tool and it worked well so far. I used the edge guide for cutting a bridge slot for an acoustic guitar build. I will also be using this as a circle cutter for installing the rosette on my guitar. The one downside to this tool, is the inabillity to line up the bit by eye, as the base covers up the cutting bit, and cannot be seen when the bit is cutting or before it cuts. This makes it difficult to get it in the correct position for cutting. The cost of the product was very reasonalbe.

I used this to cut out holes for the subwoofers in my subwoofer box. It worked pretty well, but not perfect. Results were somewhere in-between a jigsaw and a router. I drilled a pilot hole for the center pivot piece as well as the cutting bit so I didn't have to ease it in at an angle or anything funny like that. With MDF it could take off 3/8" of material at a time, but I had to max the RPM on the Dremel which I normally don't like doing. The bit seemed to like cutting clockwise better than counter-clockwise (perhaps that's in the instructions I threw out, I don't know). The first pass took longer than the second.Make sure you have the circle you're cutting supported separately but at the same height as the main piece you're cutting from, otherwise when you get to the end of the cut it'll start dropping and you'll become inaccurate.Overall I would plan on making your cuts slightly larger or smaller (depending on if you're using the inside or outside of what you cut) and sanding it a bit to even it out. If you really want a PERFECT circle this probably isn't enough, at least for thicker materials or thicker/quicker cuts. But a proper router is incredibly expensive in comparison, especially if you already have the Dremel anyway and just have to buy this attachment. For one-offs it's fine, but if you plan on using this daily you have the wrong tool.

Using this circle cutter with straight edge guide is a great way to turn your dremel into an even more valuable power tool. The circle cutter has worked flawlessly cutting very clean and quick circles/holes. The alternative is to purchase very expensive hole saws that require a major drill for the larger and deeper holes. The dremel and spiral saw bit will allow you to cut very large holes quickly. Set up is a snap and the center point adjustment is super easy to set without any special tools. The hole sizing gauge is a bit general, but if you need a precisely sized hole, I use a tape measure to set the radius by measuring from the far side of the spiral bit to the center of the pivot point. The straight edge guide turns your dremel into a small router that you can use to do all sorts of helpful cuts. Often, whenever I am away from my router table, this is my go to tool for cutting a small and simple dado or rabbit, or cleaning up an edge. I love this attachment!

todo lo dremel es exelente

Got a used product that was missing some of the hardware, which made me have to find a bolt to attach the slide part and the bottom.Works ok. Super jittery. I'm not sure if it's because someone messed it up and returned it or because that's just how it's designed.I don't know.Amazon. Stop sending it old, used stuff to people or if it's opened at least do some quality control

This is my second time purchasing this tool because I misplaced the first one. I used this to cut out round speaker holes for both HDF boards and ceiling boards. Of course HDF board take longer time to cut and after a couple of wholes (6" diameter) the cutting drill bit became somewhat dull. Cutting the ceiling boards is like cutting butter with a sharp knife, very easy and accurate cuts. It takes a little practice to figure out how to setup the position of the drill bit to a precise cut, but once you figured it out, it's pretty easy to setup. I recommend this tool.