One More Shaft Deflection Question

1 Pocket Ghost

1 Pocket Ghost

AzB Silver Member
Silver Member
I have a shaft deflection question that I don't believe was ever put forth/covered in any of the other shaft deflection, ld shafts, squirt, etc. threads...I'm aware of the fact that that weight at the end of the shaft increases deflection, but my question here, pertains to the entire shaft...maybe the science guys, or cuebuilders can give me an answer...

Ok, I have two cues (and by the way, this is a real situation - not hypothetical)...both of these cues,,,

Weigh the same - 19.oz

Have the same balance point @ 19"

Have the same joint screw and same phenolic joint sleeves

Have standard hard rock maple shafts made by a custom cuemaker

Both shafts have a similar modified pro taper, are 13mm and have the same ferrule type and length, and the same type of tip

The one difference in the specs of the cues is...that although they both weigh 19oz., Cue A has a butt that weighs 14.8 with a shaft that weighs 4.2...while Cue B has a butt that weighs 15.2 with a shaft that weighs 3.8...

All of that said...My situation is: Cue A when shot with, produces decidedly more deflection and squirt than Cue B does...

So my question is: Is the significantly higher amount of deflection produced by Cue A happening because of it's heavier shaft?...:confused:

Thanks for all replies, Ghost
 
1. Cue B might have a little void underneath the Ferrule. :D
2. Mass of the ferrule might be different.
 
two different shafts

i would look at it like we all have a different personality, no two people are
just alike . i would say the same about two cues may look to be the same
may be the same specks. i would be sure that the two cues came from different trees . said all that to say this the density of the wood from one
shaft to the other can vary.
hope this answers your question
johnqbs: anderson sc
 
You should find out what typical Predator shafts weigh. They're anorexic!:grin-square:

Martin
 
I would be very surprised if a void under the ferrule was your problem.(sorry if I offend, only my opinion.)You say they both have simalar shaft taper? What are you judging this on? VERY slight diffrences in shaft taper can really make a big diffrence in hit.
 
The easy answer is: Yes.

Endmass is the deciding factor, and the lighter shaft will necessarily be lighter on the end..... Causing lower deflection.
 
You can set up a pair of scales,have the tip on one and the joint on the other. To get best results have the scales so that the centerline of th ecue is level. Weigh each cue and note the values on the scales at each end. You will be able to pick up if one shaft has a higher density at the tip end.
The other test is to see what the flex amount is in the shafts with a constant weight and measure the deflection.
It is also possible that the tips are not exactly the same and another tip could be the fix.
Lots to look at.
 
Thanks for the informative replies so far...I forgot to add in my op...

There is one other variable - the butt wood of each cue...the cue with the heavier butt is made primarily of African Blackwood - the cue with the lighter butt is made of primarily curly Maple...I don't know if this could/would also play into it.

Thanks, Ghost
 
W.Earp said:
I would be very surprised if a void under the ferrule was your problem.(sorry if I offend, only my opinion.)You say they both have simalar shaft taper? What are you judging this on? VERY slight diffrences in shaft taper can really make a big diffrence in hit.
Click to expand...



Both shafts have tapered up, starting at the ferrule end, a little more then 2,000ths to the inch - both having gone up to 35,000ths at the 15" mark.


- Ghost
 
Everything I've read states that the mass at the end of the shaft is what counts. Sheldon hit it on the head, except I'd add that it's about whether the cue ball bounces more off the shaft or the shaft bouncing more off the cueball. Pretty much what Sheldon just said, just worded differently. Cheers
 
1 Pocket Ghost said:
Thanks for the informative replies so far...I forgot to add in my op...

There is one other variable - the butt wood of each cue...the cue with the heavier butt is made primarily of African Blackwood - the cue with the lighter butt is made of primarily curly Maple...I don't know if this could/would also play into it.

Thanks, Ghost
Click to expand...

Does both cues have the same joints? Try swapping shaft.
 
If both shafts weight the same wouldn't the balance point of the shafts indicate if one were lighter towards the tip and consequently have different deflection characteristics?
 
Hi, Question: Doesn't the taper geometry or the spine of the shaft have anything to do with the deflection issue. Rick G
 
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