View Full Version : Measuring deflection
Are there any test shots I can do to gauge deflection?
08-15-2002, 05:18 PM
From the RSB newsgroup, FAQ
Here's a quick test to see if the cue is worth looking at further. It tests the amount of "squirt" or deflection on extreme english shots.
Many expensive sticks fail this test. This idea can also be used to compensate for squirt for some sticks, and when it is used for that it is sometimes called "backhand english" since the back (grip) hand is moved over to get side spin. (The definition of squirt is in the glossary (Answer #1) above.)
The "aim-and-pivot" method of squirt compensation:
For each cue stick, there is a particular length of bridge for which you can aim straight at a close object ball and then pivot about your bridge hand and shoot straight through the new line and hit the object ball full. (You can also use this (very old) method for non-full shots too, but a full shot is best for finding the
right bridge length.) For a stick you want to measure, just find the needed bridge length. A hint: if you shoot softly at a ball far away, the cue ball will curve on its way to the object ball, and your measurement will be useless. Do not give the cue ball the time or distance to curve. Shoot firmly. Use as much side spin as you can without miscuing. The shorter the bridge, the more squirt the stick has. ("Close object ball" means about a diamond
away.) The cue ball should sit in place spinning like a top when it hits the object ball full.
For a long pivot length, the bridge is too long to be a comfortable pivot. Arrange to have the pivot over the rail, and use your back hand to hold the stick at the pivot while the bridge hand moves. An alternative is to slide the bridge hand forward after the pivot to a more comfortable bridge length. Take care to keep the stick aligned in the new direction.
If several cues are available, including house cues, compare them.
Squirt is the most important characteristic of a cue stick after solid construction. Less squirt is usually better, especially if you use something close to "parallel aiming" on spin shots. More squirt means more aiming compensation on any shot with side spin. The one possible advantage of squirt is that if the pivot length is the same length as the bridge, it can compensate for inaccuracies left-to-right in the final stroke.
<blockquote><font class="small">Quote:</font><hr>...there is a particular length of bridge for which you can aim straight at a close object ball and then pivot about your bridge hand and shoot straight through the new line and hit the object ball full...For a long pivot length, the bridge is too long to be a comfortable pivot. Arrange to have the pivot over the rail, and use your back hand to hold the stick at the pivot while the bridge hand moves. An alternative is to slide the bridge hand forward after the pivot to a more comfortable bridge length. Take care to keep the stick aligned in the new direction.
Thanks for your reply, Tom. I don't understand the parts about "pivoting about your bridge hand" and "the new line." Would someone explain this more clearly?
08-15-2002, 06:26 PM
There are two aiming conventions described here..
one is the parallel (most popular) and the other is the back hand pivot method.
The parallel method uses a direct compensation aim for distance and amount of squirt or deflection. If you are hitting left side english, you have to compenstate for the cue ball going right, by hitting the cue ball more to the left of the aim line.
Back hand pivot compensation is still used by some players. None that I know of in this area.
Much clearer. Thanks again, Tom.
08-15-2002, 06:39 PM
on my website, www.geocities.com/cincytom314 (http://www.geocities.com/cincytom314) there is a section on Drills. Included in this section is a drill to see how much you have to compensate for your cue deflection. Check it out.. and let me know what you think.
08-17-2002, 06:19 AM
Yes, there is a faq available fron the newsgroup rec.sport.biiliard that describes the set-up and method to do this on any table with any cue. Maybe someone could post the link for you?
It uses the "aim and pivot" method.
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