matching a arbor taper with a threaded end

Bill D said:

I need to make a tablesaw arbor to match a female taper in my saw. How do I match this taper? If it was not threaded I would blue the taper and check the fit. Being threaded any blue will smear around. My plan is to swing the lathe compound to match my sample.
I suppose I could make a sample piece without the threads first. the depth of seating into the taper does not matter. I do not have any good way to measure the angle. I do not care what the angle is just that my piece matches the angle, what ever that angle may be.
the attached photo shows one similar to what I have to make. The taper may be slightly different, but similar angles, If not the exact same angles.
Bill D.

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stoneaxe said:

On the pic, the screw thread on the right end pulls the taper in to a female socket, yes? And on the left there is a threaded shaft with collar and nut for a saw blade?
Do you have a sample part?
To get the taper, set up the sample in the lathe and set the compound with a indicator and run it on the taper till it zeros over the length of the taper. That is your angle.

If you are not sure, or do not have a sample, measure the angle as close as you can, turn a test piece without the threads, then blue it to check, and adjust as necessary.

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Bill D said:

That is how it works. I am in the process of taking the saw apart to replace bearings etc so I should be able to remove the old short arbor and use it for a sample.

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Metalurgent said:

Interesting project. Left hand threads at both ends with non-standard thread profiles. Plus the taper cutting.
My old Delta Rockwell 14" used to use the same style extended arbor for dado cutting. Make sure you can get the short arbor out before you go to the trouble of sourcing material for a new arbor. I had two saws and nothing could make the old arbor back out on one of them.

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