Does anyone know the coefficient of friction between cue ball and tip?

Pubo

Pubo

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So I'm still thinking about the miscue limit mentioned by Dr.Dave, and I'm wondering if anyone knows the COF (static and sliding) between the cue ball and a leather tip (chalked and no-chalk)? If not, I'll do an experiement myself and report up here.
 
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kling&allen
Pubo said:
So I'm still thinking about the miscue limit mentioned by Dr.Dave, and I'm wondering if anyone knows the COF (static and sliding) between the cue ball and a leather tip (chalked and no-chalk)? If not, I'll do an experiement myself and report up here.
Click to expand...

Dr Dave has some values here

Pool Physics Property Constants - Dr. Dave Pool Info

Answers to frequently-asked questions about physical properties related to billiard and pool physics.
billiards.colostate.edu billiards.colostate.edu
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Patrick Johnson said:
Does it happen on both long and short shots? On long shots hitting with maximum low actually gets less draw action than hitting a little above that, with the same non-slip traction.

pj
chgo
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This is kinda what's going on. First its a 7'er with chalky cloth but you can still get draw from anywhere. Draw length for me blocks off into slight, slightly more, medium, and most (3/4 length and back), before the mentioned dead ball stun or launching the ball outright.
On shots out to a foot, I get all I need with reasonable control.
 
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I have not read all of the posts, so I apologize for that.
I have two questions
first is
did we find the answer to the coefficient of friction?
2nd question
those our arrows at the bottom of peoples posts and then some have a number in between them
what is that?
 
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bbb said:
I have not read all of the posts, so I apologize for that.
I have two questions
first is
did we find the answer to the coefficient of friction?
2nd question
those our arrows at the bottom of peoples posts and then some have a number in between them
what is that?
Click to expand...
Read the thread! Lol! J/K. The numbers are post up/down voting. Bob Jewett says the CoF is 0.6. From recent discussions with Dr Dave, the miscue limit, regardless which chalk he tested was the same. That tells me that the miscue limit is as much about the geometry of a cueball and cue tip. I suppose that can be said about a lot of CoF studies if they do a ramp.
 
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Cornerman said:
Read the thread! Lol! J/K. The numbers are post up/down voting. Bob Jewett says the CoF is 0.6. From recent discussions with Dr Dave, the miscue limit, regardless which chalk he tested was the same. That tells me that the miscue limit is as much about the geometry of a cueball and cue tip. I suppose that can be said about a lot of CoF studies if they do a ramp.
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thanks alot for the info freddie,,,,(y)
have a great day...:)
 
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The DigiBall gives an alternate method of measuring miscue limit accurately, without the need for a high speed camera. So anybody can try with their own equipment. Here is some data I showed previously.

This does not answer any questions about tip COF however. Also this plot doesn’t show the miscue limit as 0.5in. You can go out further.
IMG_2878.png
 
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nataddrho said:
The DigiBall gives an alternate method of measuring miscue limit accurately, without the need for a high speed camera. So anybody can try with their own equipment. Here is some data I showed previously.

This does not answer any questions about tip COF however. Also this plot doesn’t show the miscue limit as 0.5in. You can go out further.
View attachment 727110
Click to expand...
How does it detect miscue?
 
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Cornerman said:
Read the thread! Lol! J/K. The numbers are post up/down voting. Bob Jewett says the CoF is 0.6. From recent discussions with Dr Dave, the miscue limit, regardless which chalk he tested was the same. That tells me that the miscue limit is as much about the geometry of a cueball and cue tip. I suppose that can be said about a lot of CoF studies if they do a ramp.
Click to expand...
Does that mean that all the chalks Dr.Dave has tested all have COF~0.6 with the ball? That's why the miscue limits are all identical
 
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nataddrho said:
No. Not specifically. But I never did a study on it. It would look like a very low spin shot.
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Yeah. One more thing that's possible to do might be to detect another hit to the CB shortly after (0.1 s maybe?) the first hit. Since all (observed) miscues involve multiple hits.
 
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Pubo said:
yeah, the tip or ferrule or shaft will contact the ball after the frist hit. Dr.Dave made one video on this
You might not agree with the "miscue should be foul" statement but double hits do occur.
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These are the types of ideas for features I was looking for. Thank you!!
 
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Pubo said:
Does that mean that all the chalks Dr.Dave has tested all have COF~0.6 with the ball? That's why the miscue limits are all identical
Click to expand...
I suspect no. I think that there is a minimum CoF for chalk to be effective and to not slip until it hits the miscue limit. But the geometry of a sphere being what it is, the tip has to miscue at the limit because there isn’t much of anything to grab onto at that point.
 
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Cornerman said:
I suspect no. I think that there is a minimum CoF for chalk to be effective and to not slip until it hits the miscue limit. But the geometry of a sphere being what it is, the tip has to miscue at the limit because there isn’t much of anything to grab onto at that point.
Click to expand...
But a rubber tip lets you hit further right? I know it increases deflection and contact time, but you can hit farther with something that has highter COF
 
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Cornerman said:
I suspect no. I think that there is a minimum CoF for chalk to be effective and to not slip until it hits the miscue limit. But the geometry of a sphere being what it is, the tip has to miscue at the limit because there isn’t much of anything to grab onto at that point.
Click to expand...
But a rubber tip lets you hit further right? I know it increases deflection and contact time, but you can hit farther with something that has highter COF
 
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