Facing off piloted shaft insert?

Dustin_J

Dustin_J

Commence the Jigglin!
Silver Member
Hello,

I have a 5/16-14 Jacoby shaft that I want to adopt for use with another butt, but the the shaft is built for a piloted joint whereas the new butt is 5/16-14 flat-faced. The picture below is very similar to the shaft I have. The internal threads on the shaft insert don't start until well below the "surface" of the actual shaft (i.e. 1/4" or so into the insert), so it seems like one could just face the piloting off and be in business. Is this reasonable, or should I just have the entire insert replaced?

Thank you for your help on what may be something of a silly question

Jacoby.jpg
 
You should be able to cut the pilot off and not run into problems. I have done it a number of times.
 
I have done It many times too, but use Your calipers to check the depth of the hole, then check that against the pin to make sure It will work. Also It's possible to bugger up the start of the threads when doing this, so having the correct size tap to chase the threads is a good idea, although I have a way to do It without messing the threads, By cutting It off in reverse, but It could turn out badly if not done right, so I wouldn't recommend It to everyone..

Greg
 
Very good suggestions regarding pin length and such. Thank you very much guys.
 
Dustin_J said:
Hello,

I have a 5/16-14 Jacoby shaft that I want to adopt for use with another butt, but the the shaft is built for a piloted joint whereas the new butt is 5/16-14 flat-faced. The picture below is very similar to the shaft I have. The internal threads on the shaft insert don't start until well below the "surface" of the actual shaft (i.e. 1/4" or so into the insert), so it seems like one could just face the piloting off and be in business. Is this reasonable, or should I just have the entire insert replaced?

Thank you for your help on what may be something of a silly question
Click to expand...

Just a couple more points of interest for your consideration.

Do you have a lathe or just how are you going to do this?
To be honest with you, there's a little more to it than what has been laid-out.
We'll go ahead and assume that the pin in the handle that this shaft is intended to go on is DNP in the center of said handle.
There may or may not be a difference in the diameters of the shaft & handle at the joint.
After you've shaved the pilot, you want to put the chamfered center back in the insert.
This is why I asked if you had a lathe capable of this task.
Ideally, you want this beveled center to be truly concentric with the internal threads of the insert. This will come into play if you need to change the shaft's joint dia. or if you need to true the shaft to the handle.
On the other hand, maybe all you want to do is get this shaft to fit on your cue and don't really care for all the other stuff. In which case I would tell you to shave the pilot & go play.

We do get the occasional silly question but yours ain't one of them.
 
Thanks again. I do have access to a lathe, but from the sounds of things I'm better off just taking it to a competent cuemaker to get it done. As I suspected, it's probably not as simple as it sounds and trying to save $10-15 to convert a $100 shaft just doesn't seem like the way to go :cool:
 
If you needed you could chuck the shaft up and drill deeper then run a Tap thru the pilot if the pin is too long after the pilot it cut off. I've done it a number of times with no problem

Won't hurt anything.
 
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