Parabolic Tapers

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Kamikiri

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If a shaft has a parabolic taper, does it mean the shaft does not roll straight?
As in, there's a weird wobble somewhere near the middle of the shaft when rolled on a table.

Thanks.
 
Kamikiri said:
If a shaft has a parabolic taper, does it mean the shaft does not roll straight?
As in, there's a weird wobble somewhere near the middle of the shaft when rolled on a table.

Thanks.
Click to expand...

Only if it's not round, or not straight.
 
My shaft is parabolic tapered, when i roll it on the table, it doesn't roll straight, does that mean its normal? D:

Also, how would you judge a cue's straightness other than rolling. People have told me that if the tip does not leave the surface, its straight.
 
Kamikiri said:
My shaft is parabolic tapered, when i roll it on the table, it doesn't roll straight, does that mean its normal? D:

Also, how would you judge a cue's straightness other than rolling. People have told me that if the tip does not leave the surface, its straight.
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put it together and sight down the cue like you would shooting a rifle turning it slowly
if it aint straight, you'll know it :wink:
 
There are reasons other than warpage that can make a shaft not roll true but they are also faults in the shaft or cue. This is why often you here people stating in the for sale section that the shaft rolls true both by itself and together. A tip not perfectly round and concentric with the shaft can make it roll funny. Likewise if the ferrule is not straight or the deco-ring is not round or straight or if the shaft has been sanded more on one side over the other. If all these things are correct and true the shaft should roll perfectly, regardless of the taper the shaft has. When the shaft is rolled the tip and deco ring should be touching the table and there can be varying amounts of distance between the shaft and the table depending on the taper but when this shaft is rolled these distances should remain a constant. If the distance varies when rolled there is a problem.

Dick
 
The tip can stay on the table and the shaft still be be warped. The tip can leave the table and the shaft still be straight. The problem for both of the above senerios can be the joint not being faced off correctly, or the joint pin in the butt can be off center. Then when a perfectly straight shaft is cut down on the back end to match the butt, it will no longer be concentric with the rest of the shaft and cause you to see some daylight when rolling it on the table. There is not much you can do about that, and it does not affect the playing of the shaft. Dealers will often refer to that as "taper roll out" instead of warpage. It is really not warped, but does appear to be when rolled because the back couple of inches does not match the front 27 inches of the shaft. This is one reason building extra shafts for other brands of cues can be a nightmare for the cuemaker. A customer wants his shaft to roll perfect, but he does not have a perfect cue butt to match it to.
 
cueman said:
The tip can stay on the table and the shaft still be be warped. The tip can leave the table and the shaft still be straight. The problem for both of the above senerios can be the joint not being faced off correctly, or the joint pin in the butt can be off center. Then when a perfectly straight shaft is cut down on the back end to match the butt, it will no longer be concentric with the rest of the shaft and cause you to see some daylight when rolling it on the table. There is not much you can do about that, and it does not affect the playing of the shaft. Dealers will often refer to that as "taper roll out" instead of warpage. It is really not warped, but does appear to be when rolled because the back couple of inches does not match the front 27 inches of the shaft. This is one reason building extra shafts for other brands of cues can be a nightmare for the cuemaker. A customer wants his shaft to roll perfect, but he does not have a perfect cue butt to match it to.
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When building a shaft for any cue there is a way so that the shaft will run dead nuts after completion regardless of the pin or inserts placement. I've detailed the procedure in the past. I don't know if anyone read it or not and won't go through it again.

Dick
 
rhncue said:
When building a shaft for any cue there is a way so that the shaft will run dead nuts after completion regardless of the pin or inserts placement. I've detailed the procedure in the past. I don't know if anyone read it or not and won't go through it again.

Dick
Click to expand...
You can copy and paste it or give us a link. I know a couple of ways to do it, but both take a good bit of extra time. And I know of no major cue manufacturer that would take the time to do it, if they don't get the pin in perfect in the first place.
 
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