Measuring shaft deflection

[qbilder]

The tip either grabs, or it doesn't!

Then what is skid?

When a CB hits an OB, the ball surfaces slip during contact. They gear together at some point during contact (like the cue tip and CB) only for small cut angles or when sidespin on the CB is close to the gearing amount of outside english. Ball gearing is what creates the flat portions of many of the throw-effect graphs and some of the interesting (and non-obvious) throw effects (see items 16-38 in the numbered list).

This I understand. My question is what makes this any different than the reaction between cue tip and cue ball. Obviously the tip is connected to a shaft, but the cue ball is not. Cue ball deflection is what's in question, is it not?

 

[qbilder]

Let’s try it! I expect the non-miscue, cueball cue tip squirt results to be just slightly more than with traditional chalk, but maybe not significant.

And of course we can test for squirt without chalk. Just stay within a certain offset range.

I'm game. Easy enough project to make the tip

 

[dr_dave]

A tip-CB collision is very different from a CB-OB collision. With a tip-CB collision, there must be enough friction to prevent slip. If the tip slips, a miscue results. Having more than enough friction doesn't change anything. The tip either grabs, or it doesn't!

Then what is skid?

See cling/skid/kick. It has nothing to do with tip-CB contact.

When a CB hits an OB, the ball surfaces slip during contact. They gear together at some point during contact (like the cue tip and CB) only for small cut angles or when sidespin on the CB is close to the gearing amount of outside english. Ball gearing is what creates the flat portions of many of the throw-effect graphs and some of the interesting (and non-obvious) throw effects (see items 16-38 in the numbered list).

This I understand. My question is what makes this any different than the reaction between cue tip and cue ball. Obviously the tip is connected to a shaft, but the cue ball is not. Cue ball deflection is what's in question, is it not?

Again, the cue tip is supported by a shaft that constrains the tip's motion, which is what is responsible for CB deflection (AKA "squirt") per the info on the what causes squirt resource page.

Again the collision between a CB and an OB is very different:

1.) The CB slides against the OB, at least during the initial part of contact. This is not true with a chalked tip that grabs without sliding. If the tip slides at all on the CB, a miscue results.

2.) The CB is free to rotate (and possibly gear with) the OB. This is not the case with a tip that is constrained by the shaft and gets pushed sideways as the CB starts to rotate.

3.) CB-OB contact time is much, much smaller than tip-CB contact time.

Regards,
Dave