3/8 and Radial?

always interest bob. youre site and little "experiments" are very helpful to us makers that dont know it all and dont mind asking/learning...lol
 
pic

I just realized I've been talking about a .304 diameter tap drill when actually I've been making it .302 - which is an "N" drill. My mistake.

Link will take you to a pic showing the results of power tapping a 9/32 diameter lead hole. Notations on pic should explain everything.

One thing visible is that joint pin does look like it's stretched.

http://dzcues.com/images/281_lead_drill.jpg
 
My point had nothing to do with how many times the bolt or pin is screwed in or out compared to an automotive bolt. It has to do with how much strength it takes to hold something. The flat at the bottom of the radial pin may allow shaftwood to touch more surface but is that surface providing any pulling or holding power to the thread? I think not. It does lessen any possible side to side movement during extremely hard stroking, which is not something done on the majority of shots. If this potential side to side movement was of such great concern than I would think that most cuemakers would still be using piloted inserts that actually did what they are supposedly designed for instead of being undercut and still allowing some movement. Uni-lock seems to think that you can hold the shaft in place with 1 thread and many cuemakers think they work just fine. I think it all comes down to marketing, someone else always has something they think is better and will show you a hundred reasons why. I think the radial tap allows for cleaner cutting of the threads with less tearing and that is good. That is holds the shaft on "better"? Not too sure about that. By the way, I use Uni-lock, Radial, 3.8"x10, 5/16"x14 and 5/16"x18 in the cues I make. Some are installed because the customer wants them and some because of final weight for the cue.
 
bdcues said:
Everytime I see posts about thread contact I makes me wonder. If it is so neccesary for all that contact on a 4 oz shaft why is it not neccesary on a single part connected to a car? Connecting rod bolts are not radial thread. Cylinder head bolts are not radial thread. Main cap bolts are not radial thread. Rear carrier bolts are not radial thread. So why would a cue need more thread contact when the force is one-directional, not multi-directional as some car parts are and when the one-directional force is a fraction of what the load rating for said bolt (pin) is?
Click to expand...

Machine bolts such in an engine are not relying on the thread mating sufaces to keep the parts together.

They rely on the clamping force of the bolt when it is stretched by applying torque. Steel is very elastic, therefore it is trying to retain its original length before tightening causing a clamping effect on the two parts.

A well fitted pin in a cue shaft allows for a smoother transmission of harmonics through the cue resulting in a nicer feel and sound.
 
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