Whiteside 6210 CNC Spoilboard Surfacing Router Bit, 1/4 Shank

This is my favorite flattening bit hands down. I use it in my CNC machine as well as in a custom built router sled. It leaves very slight tool marks, that disappear almost instantly when you go over them with an 80 and then 120 grit sand papers.

Works as it should. Seems to be well built. Only used once so far.

This bit did a great job leveling the spoil order on my CNC router table.

This bit did a great job resurfacing the spoilboard on my CNC. In the photo you can compare the before (inside) and after (outside edges). Surface was completely smooth to the touch, and no tearout on the edges.

Did a great job leveling my 24 X 49 particle board vacuum chuck spoil board. I used a spindle speed of 12,000 RPM, a feed rate of 80 inches per minute, a .010 depth of cut and a .4 step over on this 1 router bit to make a smooth surface thats free of ripple that might be caused by an out-of-tram spindle. It took a little over 30 minutes to level the spoil board and it made a lot of very fine dust. The CNC router is completely enclosed so this wasnt a problem, but if you use this without a full enclosure, youll have fine dust flying all over your shop and you dont want to breathe that fine dust.

If youre looking for a great router sled bit look no more you have found it....I kept putting off buying one for so long but will buy only Whiteside bits from here on.

Once I surfaced my spoilboard I was able to properly tram it. Then I surfaced again and now all my cuts are dead on flat as the should be. This is a got to item!

Works as intended, and cheap enough to warrant keeping around. I use it for surfacing MDF wasteboards only, wouldnt use it to surface my actual workpiece I dont think.

Bought this to flatten boards to wide for my jointer and for end grain cutting boards. Works great

Ive read stellar reviews and have used this bit for a handful of projects that were spread out over about a month. Facing my spoilboard, and a couple MDF & Birch wood projects. I tried 1 epoxy inlay project and the bit was actually ripping out epoxy along each pass. This bit worked great at first. Not anymore. The edges of the but are not quite sharp anymore. Theyre actually polished looking, which lens me to believe that the carbide grade isnt that great and/or the relief grind is shallow. First off, I know for a fact that the relief being angle on this bit is very shallow. In the machining industry, relief grind is generally @3 degrees. This does not appear to be the case. The cutting edges are polished. One usually only seen this when machining extremely abrasive materials such as glass filled composites, titanium, or nickel based alloys. I highly recommend paying the extra money for insert bits.