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

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.

I recently needed to flatten the mdf spoilboard on my CNC. I ran my typical flattening toolpath, and this bit performed just as well as my previous bit. It is a little more lightweight feeling, but the cut was great. With this performance at this price, it is hard to justify a more expensive bit assuming it will last a reasonable amount of time.

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.

It flung off and nearly killed me

I built my own flitting sledge. And flattened 2 2×12 boards. Always wanted to do that.

It flung off and nearly killed me

Good router set. I have a router but these need something more stable like a router table or something like that.

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.

Please stay away from this bit. Spend a little more for Freud which is a top tier brand. Notice many of these reviews are people who received it for free. This could have ended a lot worse than just a damaged router (not to mention my wood piece). I will say, though, that I was refunded but still - a product like this shouldn’t be on the market

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.