Reply by Grandpa

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Posted on flat bottom dado

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3259 posts in 2700 days

#1 posted 09-13-2012 02:51 AM

When cutting threads on a lathe you run to the shoulder then stop the feed and then back the tool out. This leaves what is called an under cut. This is much like what we see in your photo. It is a simple way of keeping the tool from hitting the shoulder and causing damage to the tooling. This arbor might have been made that way. It does look like it has been hot in that area. I am wondering if at sometime a blade or chipper has stopped turning and the arbor was able to continue turning causing this to heat up. In any case it looks like you need a new arbor. This is not going to heal itself and you will not be happy no matter how many dado sets you buy. JB Weld might do the trick. I would try it first. Like the Scott said $3 and 5 minutes will tell you if it was worth the effort.

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