Modifying router bitsA lot of stuff I do with my tilting router lift requires router bits without a top guide bearing, so I figured I'd write up a short article about modifying the router bits for this purpose.
To do the final flattening, I have to use the corner of the wheel. It's necessary to cut lower than the carbide cutter edges to prevent the remaining metal from rubbing against the wood. It's ok to nick the inside edges of the carbide a bit.
The flattened bit. This one was quite easy. I had a bevel bit that I flattened where the top edge of the carbide caused some burning, and I had to cut that back a bit. The carbide really doesn't cut very well on a bench grinder. But a diamond wheel tile saw was able to cut the carbide. It was a bit rough though, the tile saw's wheel's effective grit was much too coarse.
All the bits I have modified so far came from one of these cheap router bit sets, which came with my router. I think it added about $20 to the price of the router, so it comes to about $1 per bit. I have two identical sets of bits like that, so I wasn't too worried about accidentally destroying one. So far, haven't wrecked one yet.
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