YONICO Horizontal Crown Router Bit 1-Inch Radius 1/2-Inch Shank 16173

I used the cove bit to create the top supports for this fireplace surround.

Con esta pieza es más fácil realizar mi trabajo, biene muy bien afilada, no deja marcas de fricción como quemaduras!

Bought this 3" dia crown molding router cutter to make a dished depression in nesting trays for my purple martin house. I use it in chucked up in my drill press running at 300 rpm. Of course the finished bowl shape isn't perfectly smooth, but it doesn't matter to the birds. With C3 carbide cutting edges, I'll never wear it out cutting western red cedar at 300 rpm. I have purchased Yonico router cutters in the past and have never had a performance problem with them. I do wish this crown cutter was a larger diameter, but am happy to have at least found it.

I wasn't sure what to expect with this bit, since the reviews weren't very helpful. I thought that I would post some more information based on my experience with this bit.Equipment used:Bosch 1617 with the plunge base (sub-base removed)Fixture ( I used an article from finewoodworking-dot-com. Search for "router chair seat" to find the article.)First, there seams to be a lot of questions about the cutting diameter for this bit (large bowl) and the medium and small versions. Even the seller doesn't have a basic understanding of what the relationship between diameter and radius are. The diameter is always twice the radius. This bit cuts a 2-3/4" diameter hole, if you keep it in one spot. This bit is NOT designed to stay in one spot and cut a hole. It is designed to cut a bowl bottom that is larger than the diameter. (If you want to cut a hole, then I would suggest that you find a drill bit designed to cut that size of hole. This bit is not the correct tool.) I used the bit to carve out a chair seat made of mahogany. The seat was approximately 15" deep and 17" wide.Second, the speed of my router needed to be slowed down to use this bit properly. I use a Bosch 1617 router that has a speed adjustment from 8,000-25,000 RPM, which is labeled as 1 to 6 on my dial. I found that the #3 setting (16,500 rpm) worked pretty good. If the speed was set too high the router became difficult to control even with my fixture.Third, I found this bit must be used with some kind of fixture when used in a hand held router. There was too much movement and vibration to use it without some kind of fixture holding the router. Ideally, this bit should be used in a router fixed to a table, but I was not able to come up with a jig that would work on my router table, so I designed and made a dedicated fixture.Fourth, I had to actually remove my router sub-base to accommodate the bit. The bit diameter was too large for my sub-base. The plunge base opening was large enough to accommodate the bit.Fifth, I used a router bit extender to make sure the bit reached my wood. I used the Router Technologies Xtension because it has a lot of mass that helps to stabilize the bit. Router Technologies EX 2080 Xtreme Xtension Professional Router Bit/Collet ExtensionSixth, I ended up having to take 1/16" cuts with this bit. I was removing 1/4" material from the seat, so four (4) passes were necessary. The last pass was done very slowly to eliminate any tearout. I roughed out two (2) chair seats in about four (4) hours.Seventh, I found that the direction of feed was best when going with the router rotation and NOT using a climb cut. The feed rate depended a lot on the grain direction. Overlapping the previous cutting pass by 1/4 to 1/2 worked the best for getting a smooth finish.Eighth, dust collection is very difficult with this bit. None of my Bosch dust ports would collect much dust. I created a plastic tent around the fixture to keep the dust confined to the work area. This kept a lot of the dust under control, but I still had to wear a dust mask and stop frequently to let my air filtration units catch up.I have attached a couple of photos of the finished chair seat (002), fixture for the chair seat (011) and the bit and the extension with the plunge base (012).I would definitely recommend this bit, if you are wanting to route a chair seat.

I bought this bit not to do router milling along a length of wood, but rather to cut circular concave depressions to be used in bird (budgerigar) breeding nest boxes. I really wanted a 4-inch diameter head, but this one was the largest that I could find. Also, instead of using this bit in a proper routing device, I used it on a drill press which has a top "speed" of about 5,000 rpm - considerably lower than what a router typically runs.Regardless, even at my "low" speed, this bit worked really well on soft pine, digging out the wood quickly. It takes more loading on the bit to work on harder woods, but it did eventually work on maple as well.In any case, I'm happy with this item.

Used this bit on a hickory cabinet door panel. It worked well.

Good quality and reasonably priced

I thought it cut bowl shapes using my plunge router. The blade is not made for that. It made burn marks on my test pieces.