Double Tapping Combinations

HaroldWilson

HaroldWilson

AzB Silver Member
Silver Member
Hello,

I have double tapped a 5x16x18 with a 5x16x14 tap which works great as I can switch shafts between my favourite cues.

I also have a few other shafts with various joints such as uni-loc, radial etc. Can anyone tell me what combinations can be used effectively without cutting it to close and possibly eventually stripping the joint? I heard that a uniloc can be double tapped with a 5x16x14 is that correct in anyone's experience?



cheers
 
HaroldWilson said:
Hello,

I have double tapped a 5x16x18 with a 5x16x14 tap which works great as I can switch shafts between my favourite cues.

I also have a few other shafts with various joints such as uni-loc, radial etc. Can anyone tell me what combinations can be used effectively without cutting it to close and possibly eventually stripping the joint? I heard that a uniloc can be double tapped with a 5x16x14 is that correct in anyone's experience?



cheers
Click to expand...

This is a bad practice with any thread, and will comprimise the integrity of the joint.
 
I have seen the 5/16-14 to 5/16-18 cross thread and jam. It is a bad idea all around. Just change out the insert to the correct thread.
 
If you look at the thread depth of engagement , it is not very much left to keep it all retained. Even though it works in the short term, a better option would be to make a sleeved thread insert. The threaded sleeve has a common outer diameter and thread, while the inside id is that of the particular thread form. Neil
 
HaroldWilson said:
Hello,

I have double tapped a 5x16x18 with a 5x16x14 tap which works great as I can switch shafts between my favourite cues.

I also have a few other shafts with various joints such as uni-loc, radial etc. Can anyone tell me what combinations can be used effectively without cutting it to close and possibly eventually stripping the joint? I heard that a uniloc can be double tapped with a 5x16x14 is that correct in anyone's experience?



cheers
Click to expand...

That`s asking for trouble.
There is no "combinations" that lets you use wrong threads without breaking something or atleast fing up the integrity of the threads.
I have seen idiots threading 3/8-11 shafts on a 3/8-10 pin, Radial on a wavy pin etc. but sooner or later they run into problems, for idiots like that I charge extra to fix it!
 
conetip said:
... a better option would be to make a sleeved thread insert. The threaded sleeve has a common outer diameter and thread, while the inside id is that of the particular thread form. Neil
Click to expand...

Interesting ideal ... I think Universal shaft (Bill Stroud) tried something similar in the past?

If practical, I love this ideal since I play with few cues which all have different joints and I'd prefer to play with one shaft.
 
Yes a uniloc can be tapped to fit a 5/16 14 pin. I had a cue maker do it to a four inch uniloc middle extension so I could play my 5/16 14 butt with the new revo shaft.
 
mrkdenton said:
Yes a uniloc can be tapped to fit a 5/16 14 pin. I had a cue maker do it to a four inch uniloc middle extension so I could play my 5/16 14 butt with the new revo shaft.
Click to expand...

That's not double tapping. The initial threads for the uni loc were not touched. He just threaded the smooth bore for the 5/16x14.
 
conetip said:
If you look at the thread depth of engagement , it is not very much left to keep it all retained. Even though it works in the short term, a better option would be to make a sleeved thread insert. The threaded sleeve has a common outer diameter and thread, while the inside id is that of the particular thread form. Neil
Click to expand...

Thanks Neil, I had something like that going through my head. So make an insert to go into the existing joint with the inner part of the insert designed in the thread you wish to use. Makes a lot of sense :)

cheers
 
Michael Webb said:
That's not double tapping. The initial threads for the uni loc were not touched. He just threaded the smooth bore for the 5/16x14.
Click to expand...

OK I see so the 5/16x14 slips past the initial part of the uni-loc joint as it is a smaller diameter. This way that section is not being altered only the longer section is being threaded which is normally smooth anyway? so there is not any affect on the joint? that makes sense.
 
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HaroldWilson said:
OK I see so the 5/16x14 slips past the initial part of the uni-loc joint as it is a smaller diameter. This way that section is not being altered only the longer section is being threaded which is normally smooth anyway? so there is not any affect on the joint? that makes sense.
Click to expand...

Kind of. Standard hole for a 5/16x14 is .257. Approximate o.d. diameter of the 5/16 screw depending on where you buy them. .306 to .310. Uni loc smooth bore on the insert .280 Approximate.
 
Michael Webb said:
Kind of. Standard hole for a 5/16x14 is .257. Approximate o.d. diameter of the 5/16 screw depending on where you buy them. .306 to .310. Uni loc smooth bore on the insert .280 Approximate.
Click to expand...

One last question Mick, would it work the same with a 5x16x18 thread?
 
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