This is why all the top tier cue maker's shun this forum and why it's littered with so much misinformation. People post links to sites adding to a thread when the thread was about nothing they posted the link about.
It's 'Ask The Cue Maker' and replies "should primarily be the experienced cuemakers who provide the answers. It might be appropriate for non-cuemakers to give some input on occasions. But that should be the exception instead of the norm".
And if you are a "non-cuemaker" then by all means post (on occasion) when your post is relevant to the thread and adds to the topic. Not when it creates a side conversation about nothing to do with the original direction. So, now we're discussing something that has nothing to do with what the thread was originally about. If this had stayed with 'Ask The Cue Maker' we wouldn't be here.
And, if you're coming in from left field, take the time to read the thread and not post from the center of the thread not knowing what the thread was about in the first place. You don't build a cue from the wrap inward so don't comment from the center of the thread without knowing the original direction in the first place.
I'm done. Have a great day.
Joe, no offense, but you are the first one to go in the direction of sealers and the need thereof. You post appears directly above mine, so.... who came in from left field first?
BTW you never once helped the OP out with a schedule for turning shafts, just gave some "theory" based on your own observational experience. Remember, direct observation of the Earth gave rise to the notion that it was flat. This notion continued for many thousands years until mathematicians and scientists eventually proved it to be false.
Now, for those who may be interested, here's more info that may help you design a turning schedule based upon MC and ambient relative humidity:
http://www.fpl.fs.fed.us/documnts/fplgtr/fplgtr190/chapter_13.pdf
http://www.fpl.fs.fed.us/documnts/fplrn/fplrn268.pdf
http://www.ncdc.noaa.gov/oa/climate/online/ccd/avgrh.html
http://www.shorstmeyer.com/wxfaqs/humidity/rh.html
I personally am somewhat skeptical of the role moisture change has in the warping of cue shafts while turning. If the shafts are well-seasoned and equilibrated to the shop's environment, they should be the same MC inside and out. Moisture moves into and out of wood only when the actually MC of the wood differs from the EMC (equilibrium moisture content) at a given relative humidity. This info can be obtained from numerous sources on the net, but the first link I gave above is probably the best treatment on the subject that I know of. If you can read and understand everything in this document, you will be light years ahead of the average cuemaker who comes into this craft from a machining rather than a woodworking background.
I suspect that the main reason that wood moves when it is cut is because locked in internal growing stresses are relieved. This can be a rather small movement, in which case it can probably be turned out in subsequent passes. However, if you make a heavy cut in a well-seasoned dowel and the wood bends like a banana right away, I think it should be used to warm the shop come winter.
When I worked for Woodcraft Supply, I was giving a lesson on the table saw to some students. I grabbed a nice piece of kiln-dried 8/4 quarter-sawn black walnut to show how to rip a plank into strips. The first strip came off the board like a piece of modern art, instantly twisting upward and outward in two dimensions, right as it was being cut.
The students all thought it was the cheap Jet saw I was using, but I proceeded to make successive cuts in the same board. The next cut warped, but not as badly. The last several cuts came out perfectly straight, and stayed that way. Apparently, there was a lot of internal stress on one side of the plank, but it was stabilized by the rest of the plank, so it was straight until further machining was done on it.
This is also a good example of why you should never remove the anti-kickback pawls or riving knife from your table saw. Had I cut this board starting at the opposite side on a saw with the safety equipment removed, I would have eaten that whole plank in a fraction on a second.
There's another phenomenon that most wood workers are unaware of, and that is invisible runout. This was discovered by engineers trying to piece together why spruce airplane parts were failing and leading to crashes. On initial examination, all of these members appeared to be perfectly quarter-sawn, but another kind of runout was occurring because of the way the logs had been sawed.
Here's a link to a guitar making site that explains pretty clearly how this can happen, and shows why all skilled instrument makers use wood sawed from split billets rather than quarter-sawn planks.
http://www.lutherie.net/frankford.runout.html
There are other ways that this kind of runout can occur right in the growing tree, and these growing flaws can never be machined out or stabilized, nor will they be apparent with a mere visual examination.. Dowels or turning squares that come from these trees will yield rejects no matter how carefully they are treated. Toss 'em right away, it's all part of being a superior woodworker IMHO.