CENYB CNC Spoilboard Surfacing Router Bits,4 Teeth 1/4 inch Shank 2 inch Cutting Dia with Router Collet for Woodworking Tools

One of the four blades was sharpened slightly off-skew. The perpendicular edge was straight, just not the face edge. Itll still work for me, but its a hit against quality control.

I ordered this for using with my CNC. Works great for waste boards. Better than my way more expensive bit for the same job. I recommend it.

Using this bit to grind out material from a butcher block. Figured after how much material I was digging out that the blade would soon dull. Didn’t happen. Still running strong.

Do not waste your money. This is trash! First pass on a table top taking only about 1/16 got about 16 across and the bit bent, and damaged the router plate on the under side. Will cost me more to repair the router than the cost of a more expensive quality bit.

Do not try this buy a 1/2 inch shank bit this one bent and is dangerous .

Absolutely awesome product. This pair of router bits very cleanly cuts tongue and groove joins that fit well but not too tight. The joint itself isnt a friction fit and allows the boards to slide freely so its best used foe glue joints. After the initial re-tightening of the keeper screws on the bits, everyrhing works as advertised. I dont have many joints cut with these so I wont comment on the longevity of the blades, but my initial impression is very good.

It flung off and nearly killed me

I received this item for review, I was not paid to review it. The product shipped quickly and was well packaged. It even had a spacing washer included. That will be help later when the blades have worn a little. On the first pass the blades did pretty well. There was a little burning on one of the layers but I was cutting cheap plywood to get a feel for the set. The fit of the joint very clean, tight, and fit perfectly. The blades are very sharp and held up well for the 16 cuts I did. The bits are solid and should hold up well as long as they have a chance to cool a little between cuts. There is enough metal to keep the heat down but they are cutting a fair amount of material. That is the nature of this type of bit. The spacing washing may come into play as the blades wear a little. It is nice to have it in the package. These blades did a great job of making a clean. Just make sure the nut on top stays tight. After heating and cooling form use I had to snug it up a little.

Bottom line: Very economical bit and operated as I expected for CNC spoil-board resurfacing but does not provide tool files for CAD S/W. Just got finished resurfacing the spoil-board on my CNC machine with this bit. I was happy enough with the results. However, when I inspected the bit when the job was done, some of the black paint on the back of the cutting surfaces was peeling off. I dont think it affects the functionality of the bit but I do think it speaks to the quality level. It is VERY economical but there are no specifications provided other than the diameter and MAX RPM which is 18000 and I could find no information online for the product other than whats in the listing. It comes with a clear plastic holding case that is very nice but there is no useful information printed on the case. I would give it a better rating if it at least had safety information on the case. After completing the surfacing of my spoil-board with this bit, I used my Amana spoil-board resurfacing bit (RC-2255) to re-surface the spoil-board. Maybe its not too fair to compare this bit to a bit that is at least 7x the cost but thats what I have and normally use. In any case, the surface was slightly smoother with the Amana bit. I also couldnt find Vectric tool files for this bit which is something that takes all of the guess-work out of the specifications for operating the bit. Since the diameter and the MAX RPM specification was the same as my Amana bit, I used it as the basis for speed and feeds. The cut depth I used was .015 (less than 1/64). For economy, I can recommend this bit but for quality and complete information, Ill stick with my Amana bit.

This is a decently sharp bit that planes surfaces reasonably well. I have no complaints!