Radial pin

riedmich

riedmich

.. dogs' friend ..
Silver Member
Hi guys,

I need a new shaft for my break cue, but don't know who was the cuemaker. It has a radial pin, but it doesn't fit to the radial of a friend's radial cue. The diameter is not the problem, it is the pitch that is slightly different.

So I want to ask, if there are different radials and what exactly mine is, how it is exactly named.

The inner diameter of my pin is 7,8 mm, the pitch seems to be 13,5 mm for 4 thread-turns. Could it be a radial 3/10x7,5 ??
 
There are 3, maybe 4 different radial pins......... what a great idea, to use a thread that was meant for machine movement with a ball screw and nut. It was never made to screw into wood....

JABP................................. "just another bastard pin"

Kim
 
whammo57 said:
There are 3, maybe 4 different radial pins......... what a great idea, to use a thread that was meant for machine movement with a ball screw and nut. It was never made to screw into wood....

JABP................................. "just another bastard pin"

Kim
Click to expand...

My thoughts exactly. It was designed to move freely without binding.

To the OP, it may help if you measure in inches.
 
Last edited:
There's only one radial pin.
There are several fake imported kind used on Omega, Varner, Sledgehammer
and so on.
At one time about 7 out of 10 local cue makers used it.
Then some people got cheap and used the imported kind.
But, there are still a lot more variety of 3/8 10 out there.
The real radial one is pretty much universal. Same minor, od and pitch.
 
The pin was not designed for machine movement, rather no movement at all
 
I'm only aware of 2 actual radial style pins, the original made by the uniloc company, and the import copy of it. The import is a finer thread than the original. I think its around 8 tpi.

Royce
 
Im well aware of what a ballscrew is and a radial pin is not one. There is however suppliers selling replicas who term it ball thread for legal reasons. The geometry of the screw wouldnt permit the use of ball bearings and nut regardless unless undersize balls were used....at which point it would b useless
 
Ball thread or not: the connection itself works good at my cue, I can srew as with my 3/8x10 or 3/8 x11, that's not the issue.

@RBC: Does maybe the imported one have the 7,5 tpi like at my pin??
 
riedmich said:
Hi guys,

I need a new shaft for my break cue, but don't know who was the cuemaker. It has a radial pin, but it doesn't fit to the radial of a friend's radial cue. The diameter is not the problem, it is the pitch that is slightly different.

So I want to ask, if there are different radials and what exactly mine is, how it is exactly named.

The inner diameter of my pin is 7,8 mm, the pitch seems to be 13,5 mm for 4 thread-turns. Could it be a radial 3/10x7,5 ??
Click to expand...

A picture may help with a set of calipers set up along side of it so one can count the TPI. please have it set to the English standard in one picture, then metric in another.

Dave
 
The true "radial pin" design was used for attaching bones together in surgery, and designed never to loosen or back out. And as far as your question, Many times you can drill and tap with a uniloc radial then bore the threads out to open up the id on your shaft and many of the cheaper pins will screw right on to your pin. As I do say most, not all.
 
Dave38 said:
A picture may help with a set of calipers set up along side of it so one can count the TPI. please have it set to the English standard in one picture, then metric in another.



Dave
Click to expand...


How many TPI has a "normal" radial pin?
 
danieldakota53 said:
The true "radial pin" design was used for attaching bones together in surgery, and designed never to loosen or back out. And as far as your question, Many times you can drill and tap with a uniloc radial then bore the threads out to open up the id on your shaft and many of the cheaper pins will screw right on to your pin. As I do say most, not all.
Click to expand...

This is a common misconception. I heard and believed the exact same thing many years ago. I actually spent several days contacting medical manufacturers and medical hardware manufacturers all over trying to locate screws similar to the radial. All the medical fasteners I found were completely different. They are unusually small shank or minor diameter, and very deep threads. Much more acme like in appearance.

The Radial joint screw was created by Paul Costain, the original founder of the UniLoc company. His inspiration was actually the ball screw used in our automation equipment, but the radial pin is certainly not a ball screw and was never intended to operate like a ball screw. It does, however, get the centralizing aspect from that type of thread profile. I think it's a great pin.


Royce
 
The brand is no name like I wrote at the beginning. I can count and calculate, it is indeed 7,5 TPI. So if anyone knows a common naming for a radial with 7,5 TPI and inner diameter of 0,307 " , please let me know. Many thanks in advance!
 
The real Radial is either 7.634 or 7.637 TPI,NOT 7.5.

The difference between that and an 8 TPI is .006 difference in the width of the cutter,which is .1309 for the real one and .125 for the 8 TPI version,with a perfect 1/2 ball radius. With this small of a difference,you need a light and magnifier to see it.

If you good with a lathe,and have a nice lathe and put the grinder time in to make an 1/8 inch radius single-point tool,you can make the pin AND the tap yourself,because most lathes have an 8 TPI setting. ONLY CNC can do the 7.637.

I saw a new low-end Lucasi or Action cue here in town with the 8 TPI version in it.

The quality of the fit with whatever tooling they used was as nice as I've EVER seen anyone put out with the real Radial,with no exaggeration.

Personally I like the real Radial,except in G-10. I've never heard of anyone constantly having to check the tightness of the facings with a metal Radial,but it seems like the G-10 stretches a couple thousandths or something. Tommy D.
 
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