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Sharpening shops that are equipped to do that can do a pattern bit about one time.
You can get a small flat diamond hone and touch up yourself.
Steve
Mo.
I miss the days of using my dinghy with a girlfriend too. Zack Butler-4/18/24
The Revos apparently are designed to clamp railroad ties and pull together horrifically prepared joints
WaterlooMark 02/9/2020
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I use a local business for sharpening saw blades and router bits. They charge me about $6 per router bit and I'm happy with the result.
I know that each sharpening will result in a bit that is just a bit smaller in dimension, though it hasn't been very much to this point for me.
Touch up with a diamond hone is a good thing to do; you might be able to postpone a sharpening by keeping it honed and clean.
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Not all places sharpen router bits, and as mentioned above it doesn't always work out well for pattern bits. Fluted bits loose a small amount in OD when sharpened and then it isn't "flush trim" anymore. It can still be used (probably) but you need to allow for the small difference. If you have a hack sharpen it, it will be toast (for pattern routing). There are a couple of mail in places I use that do a good job, but for one bit you would be paying postage both ways in addition to the sharpening charge.
I started with absolutely nothing. Now, thanks to years of hard work, careful planning, and perseverance, I find I still have most of it left.
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In case it isn't already understood, when you hone it yourself, always hone just the face of the blade (equivalent to the back of a chisel). Trying to hone the bevel will tend to change the shape of the cut and reduce the diameter of the bit. Honing the face will change the diameter very very little.
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Problem is the bearings will probably not line up with the cutter edge anymore. Many sharpening shops take too much material off which doesn't help.
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I use the side of a diamond wheel. Hasn't failed me yet, but maybe you wouldn't be comfortable doing it by hand.