Dr. Dave's answers to frequently-asked questions (FAQs), mostly from the AZB discussion forum
Does the brand of chalk really make that much difference?
See chalk effects.
How long is the tip in contact with the cue ball?
Clips HSV A.77-A.81 and A.147-A.151 show close-ups of cue tip impact for various hardness tips and various speeds. The Jacksonville Project, also did some measurements of tip contact time. For some super-super-slow motion videos and data for how contact time varies with cue speed, see DBKcue's page on this topic. Here is a summary of the results of these videos:
Some people think that what they do with their grip hand or follow through can change the tip contact time, but this is not the case (i.e., it is not possible to get a significant effect). Also, some people think a softer tip, which has a slightly longer contact time, can create more CB "reaction." This is not the case. The peak force isn't as large with a longer contact time (i.e., the force is spread out over a longer time). Therefore, the "hit" might "feel" slightly different to the player. However, the momentum effects (cue and ball speed changes) will still be the same, assuming the tips being compared have the same efficiency. Another thing that might be different is that a shorter contact time is usually associated with a harder tip, and a harder tip might have better efficiency, so the CB might have slightly more speed (with a given stroke) with a harder tip for a given cue mass and speed. And with more speed, less spin will be lost on the way to the OB or cushion, giving the impression that the hit created more spin.
With an increase in tip contact time, the effective tip offset will be slightly greater (because the tip will rotate out with the CB during contact), but this will also result in more squirt, which will diminish the effectiveness of the slightly larger tip offset. For more info, see cue tip hardness effects and getting more spin with an LD shaft.
For more info and resources on these topics, see:
tip hardness effects
cue tip efficiency
cue "hit," "feel" and "playability
effects of light vs. tight grip
Over what distance is the cue tip in contact with the cue ball on a typical shot?
The contact distance is much smaller than most people think. For example, with a break shot with a very hard tip, a typical contact distance (per TP B.20) is only about 1/10 inch (3 mm). With softer tips, the contact time and distance is longer. With slower speed shots, the contact distance is shorter.
from Patrick Johnson (in Facebook post):
Probably the most common myth about this is that tip/ball contact time can be extended (and/or spin action can be increased) by "accelerating through" the cue ball. Accelerating smoothly throughout your stroke and followthrough is a good practice (makes it more likely you'll hit the cue ball the way you intend to), but it doesn't change tip/ball interaction.
How much does the tip deform during contact with the cue ball?
Here's an image from some high-speed video filmed by a group from Austria:
The full video clip can be viewed at HSV A.76 (it is the third clip in the sequence). The video was shot at 2000 frames per sec with a high-resolution color camera. Here's an isolated clip of the close-up of the tip contact:
I've collected a sequence of images from the video clip and have made them available in MS Word and PDF formats. The MS Word file is large (1.7 MB), but it is very useful. If you page down through the file to load all of the images, you can then use the scroll bar to simulate a flip-book animation. The faster you scroll, the faster the simulated "video" plays. The images are 1/2000 second (0.0005 or 5 ten-thousandths of a second) apart.
Here are some observations, insights, and questions from the collection of stills:
- The tip is probably relatively soft based on the contact time and amount of deformation. Contact lasts about 4 frames (over frames 3-6), which corresponds to about two thousandths (0.002) of a second.
- The cue tip seems to stay in contact with the ball as the ball starts to rotate, which might contribute to the amount of cue stick deflection.
- The cue tip had an excessive amount of chalk on it (as evidenced by the pre-impact chalk trail through the air and by the huge chalk cloud after impact).
Here's another excellent video showing the tip dynamics during contact:
See the following link for good examples of how the tip deforms and how the cue vibrates with both follow and draw shots.
Here's another video comparing tip compression for various tip hardnesses.
What affects how well a tip delivers speed to the cue ball?
A hard tip will create more CB speed for a given cue speed. For more info, see:
From the experiment in the video, the range of coefficients of restitution (COR or e) were between 0.71 to 0.75 for playing cues with medium-hardness tips and 0.81 to 0.87 for jump and break cues with phenolic tips. The analysis at the bottom of TP A.30 shows the effect this has on break power (where cue weight is also an important variable). A phenolic tip can add about 17% more power or energy to a break as compared to a medium-hardness leather tip. TP B.22 shows how peak tip contact force and contact patch size vary with shot speed. It also shows how to simulate different CB speeds with cue drop tests.
For other effects related to tip hardness, see cue tip hardness effects.
Cue construction (ferrule, joint, butt, and bumper) can also have an effect on both a cue's efficiency and hit/feel/feedback/playability.
A shaft that is very flexible (not very stiff), will tend to deform and vibrate more during (and mostly after) a hit. This vibration represents lost energy because that energy remains in the cue and is not delivered to the CB. For more info and demonstrations, see the cue vibration resource page.
from Mike Page (in FaceBook post):
There is general consensus that hard tips are more efficient (give more cueball speed for a given stick speed) than soft tips. Dave Alciatore (Dr-Dave) and Bob Jewett have done an experiment with clever apparatus they call Cue Stick Efficiency Tester with high-speed video for which this is a conclusion. It is well known that we use hard leather and phenolic tips on break cues. I question that Dave & Bob's experiment is sufficient to conclude that hard tips are more efficient. I explain here the background, what I think is wrong with the measurements.
I've brought up in the past a potential issue for cue tip efficiency with very hard tips. When we talk about cue tip efficiency, we are really talking about the efficiency of the tip AND STICK hitting a 6oz ball. For maximum speed, the ball needs to "feel" the full weight of the cue. The tip-ball contact time for phenolic tips is less that 0.001s and may be as short as 0.0005s (half a millisecond). The speed of sound in maple is about 4 meters per millisecond, and therefore the time it takes for the ball to even begin to know about the back of the cue (disturbance travels two stick lengths, about 3m) is about 0.75ms--the contact time with a phenolic tip. So there is reason to believe that all else being equal a longer contact time might be better.
Dave and Bob use as empirical evidence this is not a concern and as a demonstration showing hard tips are more efficient an experiment in which they drop cues with different tips onto a steel plate and measure how high they bounce. Phenolic tips bounce higher than leather tips, and this, in essence, is the basis of their conclusion.
Here is the problem: A stick dropped on steel does not have the same contact time as a stick hitting a ball. In fact, I estimate the tip-steel contact time to be about twice as long as the tip-ball contact time. So for cues with phenolic tips dropped on steel, the disturbance has time to travel about four cue lengths during contact rather than just two. This is a critical difference.
The compression and relaxation of the tip during a collision can be approximately modeled as a harmonic spring, at least for the purpose to determining the effect of mass on the contact time. A mass M on a spring with spring constant K connected to a rigid wall has a frequency proportional to sqrt(K/M), and the period (for us the contact time) is proportional to the inverse of this, i.e., varies as sqrt(M).
What is M for a stick-ball collision? Two massés and a spring (that of the stick and the ball) act the same as a single mass and a spring provided you use what is called the "reduced mass." The reduced mass is M1*M2/(M1+M2). For a 6oz ball and 18 oz stick, the reduced mass is about three quarters the mass of a ball, 4.5 oz. For an 18 oz stick hitting a rigid steel plate (large mass), the reduced mass is the mass of the stick, 18 oz. This is four times the reduced mass of the stick-ball combination. Because the contact time goes as the square root of the reduced mass, the contact for the drop test is expected to be twice that of a stick-ball collision.
You bring up some good points. I would be curious to see some test results that demonstrate these effects. Maybe you can come up with a simple test that will simulate a ball strike. The efficiency depends on many things: tip restitution, friction between the tip and CB during deformation, shaft vibration, elastic wave propagation, cue construction, etc., so it is difficult to offer confident theories without physical testing.
In general, over a range of speeds, I think harder tips are more efficient (see HSV B.42 - tip and cue efficiency, with Bob Jewett). Concerning the effects of shot speed and tip hardness on tip contact time, see the tip contact time resource page.
How much force is generated between the tip and the cue ball during a break shot, and what would it take to generate a "ton" of force at the tip?
See: TP B.20 - Peak forces during a break shot.
As another example, and to keep things simple, let's use a cue weight of 18 oz and assume a perfect tip with a center-ball hit. For this case, TP A.30 predicts that the outgoing CB speed is about 3/2 (1.5) the incoming cue speed. Let's also assume that the average force during tip contact is about half the peak force. And let's assume the tip is in contact with the ball for 0.001 sec, which is typical.
For any CB speed (vb), given the CB mass (mb), the momentum delivered to the CB is:
mom = mb * vb
For a given duration of contact (dt), this momentum must equal the impulse delivered from the cue:
imp = 1/2 * Fmax * dt
So to find the peak force for a given CB speed:
Fmax = 2*mb*vb/dt
And for a given peak force, the CB speed is:
vb = Fmax*dt/2 / mb
And the cue stick speed required to create this is about:
vs = 2/3 vb = Fmax*dt / 3*mb
For a 20mph break, with a 6oz pool ball, the Fmax equation gives a peak force of:
Fmax = 683 pounds
To achieve a 1 ton (2000 pound) peak force, the vs equation gives a required cue speed of:
vs = 39mph
What differences does tip hardness make, and does it affect how much spin can be applied, or the amount of squirt that results?
Here are some relevant factors and effects related to tip hardness:
There is no question that a harder tip "feels" different and provides different "feedback" (a softer tip typically dampens the impact a little and the force of the hit isn't felt as strongly). It is also true that a harder tip can result in a more efficient hit, providing more speed to the CB for a given cue speed. And it is true that with slower CB speed, more backspin will wear off on the way to the OB with a draw shot and more sidespin will wear off on the way to the cushion with a sidespin shot (especially on slow and sticky cloth with slower shot speed). These effects might make it seem like a softer tip is applying less spin to the CB. Regardless, the quality of spin (i.e., the spin-speed ratio) delivered to the CB depends only on the tip contact-point offset from center. The physics on this is very clear. If anybody doubts this, they should do a careful and objective experiment to compare any tips they think would produce different results. For those who have math and physics backgrounds and are interested, the physics showing how the spin-to-speed ratio depends only on tip offset from center, even when accounting for tip efficiency, can be found in TP A.30 - The effects of cue tip offset, cue weight, and cue speed on cue ball speed and spin.
Some people think that because a soft tip stays in contact with the CB slightly longer (see contact time), a soft tip can apply more spin. However, see Bob Jewett's comments below. Also, the contact time is still extremely small with both a soft and hard tip: close to a thousandth of a second (0.001 s). Assuming the CB speed is the same in all comparisons, even though the peak force will be different (more with the shorter contact time), the amount of momentum (linear and angular) transferred to the CB will still be the same (because the sum of force over contact time is the same in both cases). The CB doesn't move much (translation or spin) during the extremely small contact time, so the only significant factor is the tip contact point at impact.
Now, it is possible that a hard tip, especially if it is not holding chalk very well, will have a miscue limit closer to the center than a soft tip that is holding chalk well. In this case, the soft tip will enable a player to apply more spin to the CB since the tip contact point can be farther from the CB's center without resulting in a miscue. Also, if one thinks a hard tip can't hit as far out on the ball (even if it can), one might tend to hit will less tip offset from center, which will result in less spin.
There are many factors related to tip hardness that could influence squirt, including: tip density/weight, tip efficiency, contact time, and effective endmass. "Return of the squirt robot" (BD, August, 2008) documents an experiment related to the effects of tip hardness on squirt. A softer tip did seem to create slightly more squirt, but the experiment was not very well controlled (see the article for more info). In general, if the contact time is longer (as is the case with a softer tip), the effective endmass and resulting squirt should be larger (see the rubber-super-ball-tip report as an example). Another set of more careful experiments documented in the Cue and Tip Testing for Cue Ball Deflection (Squirt) video and "Cue Tip Squirt Testing" (BD, June, 2014) seem to imply that tip type, hardness, and height have very little effect on shaft squirt. Among the wide range of tips tested in the video, the harder tips did result in slightly more squirt. This makes sense because the harder tips are denser and heavier, creating more "endmass." The shorter contact time seems to be less of a factor than the added weight.
Another factor involved with a softer tip is that it might better absorb glue and adhere to the ferrule more strongly and making it less likely to come off with lots of use and/or abuse.
from Mike Page (in AZB post):
I am well aware there is an entire lore surrounding this notion that a soft tip gets more action, gets higher spin-to-speed ratio -- and that you can find the claim from amongst the best players in the room, the best players in AZ Billiards, pro players, experienced players ...
I think this claim should enter the textbooks as a superb example of confirmation bias: http://skepdic.com/confirmbias.html
Aside from the subtle contact-time effect on the offset (a smaller effect than the claims), the claims are false.
The force that produces the speed and the force that produces the spin are the same force, and at a given offset any additional force increases the two in the same ratio. A soft tip acts slightly longer, but it's basically less force acting over a longer period, and the added-up result is the same.
There are shots designed to test the maximum spin-to-speed ratio, where you can get an actual top player trying to get maximum action using different tips--basically a slightly-off-angle draw shot where you are trying to hit a rail as far back as possible. I and others have done these empirical experiments, and the results have been consistent and agree with the expectations from the physical description.
from Mike Page:
Even if soft and hard tips held chalk exactly the same, it's possible the soft tip might reduce the chance of miscue. For instance, suppose a miscue occurs when less than 50% of the contact patch has chalk. If the bald regions are small, then this standard may be violated more frequently for a hard tip with its small contact patch.
from Bob Jewett:
One issue is which harness of tip will allow the farther-from-center hit. Some believe that a soft tip takes chalk better so it can hit the ball farther from center.
There is a counter theory, and that is because a softer tip will have a longer contact time than a hard tip. During contact, the tip rides around the side of the ball some, so the final eccentricity as the tip leaves the ball is larger than when the tip first hits the ball. A softer tip, with the longer contact time will be farther off center at the end than a harder tip with the same starting offset. If both tips can only hold to a certain point of offset, and you start your shot so the miscue point is barely reached at the end of contact, the average offset will be larger for the harder tip. This means that the harder tip can create more spin for a given ball speed.
Which dominates? Holding chalk better or starting farther off-center? I don't know of any experiment that has tested this.
How hard are some tip brands relative to others?
Here is a very thorough chart of tip types and hardnesses for a wide assortment of brands (from jschelin99 on AZB)
Here is a summary of some durometer hardness test results from FLYINGSNAIL on AZB.
SAMSARA JUMP - 86.0
BLACK DIAMOND - 81.0
SUPERPRO - 81.0
WB USA - 77.0
BLUE ELF - 76.0
LePRO - 74.5
TALISMAN - (M) 70.5
TAD - (M) 75.0
TRIANGLE - 73.5
"Blue milk duds" - 73.0-74.0
KAMUI - (H. BROWN) 73.5; (M. BROWN) 71.0; (S. BROWN) 62.5; (H. BLACK) 73.5; (M. BLACK) 72.5; (S. BLACK) 62.0
MORRI - (1ST GEN. WITH "S" ONLY) 62.0; (2ND GEN. SOFT) 71.0; (OLD MEDIUM) 77.0; (M III) 75.0
TRIUMPH - 70.0
BLACK KING - (S) 65.5 (M) 67.5 (H) 70.5
TIGER SNIPER - 67.0
BAMMA - 66.0
OLD ELK MASTER ORIGINAL - 65.0
and here's a buying guide (with some useful info) available from PoolDawg, including a large set of hardness data for most-commonly-used tips.
how to replace a cue tip
How do you replace the tip on a cue?
The following videos demonstrate the process and tools needs to replace a cue tip:
cue tip replacement (Seyberts)
replacing a cue tip (Home Billiards)
What are advantages and disadvantages of laminated tips?
Laminated tips are made by compressing and gluing together many layers of leather material, in an attempt to create more consistent properties as the tip wears down with use. Some people think laminated tips are better because of they don't seem to compress and harden with use, and they seem to provide more consistency over their lifetime; but others don't like them thinking they don't hold chalk as well or that the glue between the layers can affect performance. In the absence of hard comparison data, it just seems to simply be a matter of personal preference and psychology.
from arnaldo (in AZB post):
[quoting Jack Koehler:]
"Leather (from the donor animal) is not homogenous. The texture (and hardness) changes from the hair side to the inside. If the tip is made of one piece of leather, you get a simple progression from hard to soft. The thin pieces of leather skived for lamination purposes have these same characteristics but when you stack them, to get the proper thickness, the final product is much more homogeneous. The randomness of grain from layer to layer when compiling the stacks, which you properly mention, probably also plays a part in the resulting superiority and performance characteristics."
Is it important to remove the mushroomed edges of a tip?
If your tip is properly shaped tip and you are hitting the cueball within the non-miscue zone, the extreme edge of the tip doesn't come into play (e.g., see the diagrams in "Draw Shot Primer - Part VII: tips of english" - BD, July, 2006).
However, removing the mushroomed edges does:
For more info, see tip size and shape effects.
size and shape
Does the tip and shaft size and shape make a difference?
For applying english, a smaller-diameter shaft and rounder tip (approximately "dime" radius) is generally recommended. Here are some possible reasons:
However, per the second quote from Patrick Johnson below, there really isn't much difference between a "dime" shape and a "nickel" shape.
One advantage of a flatter tip is that a center-ball hit, with some tip placement inaccuracy, will generally have less unintentional english (and unexpected squirt/swerve/throw). In other words, a larger, flatter tip is more "forgiving" with misalignment errors for near-center-ball hits. It may also be easier to control small amounts of sidespin since more cue offset is required to create more sidespin, as compared to a rounder tip. With stroking errors, where the cue is pivoted relative to the bridge, a flatter tip will result in less sidespin; however, the CB will head in the direction of the pivoted cue (minus the small amount of squirt corresponding to the small amount of sidespin). Therefore, the potential benefits of automatic stroking-error correction due to back-hand english (BHE) effects won't work as well with a flatter tip (unless the bridge length is very long).
Here's an expanded diagram from "Squirt - Part VI: tip shape" (BD, January, 2008) that illustrates tip shape effects:
Another concern related to shaft diameter is bridge comfort. With a closed bridge, some shaft sizes and tapers will be more comfortable than others to different individuals. This is less of a concern with an open bridge.
The shaft size and tip shape can also influence how some people apply english if they use "tips" of english and/or an aim-and-pivot squirt compensation system (e.g., BHE). This might make some people think they are getting more or less english with different size and shape tips. For more info, see "Squirt - Part VI: tip shape" (BD, January, 2008).
Tip shape can also affect the results of squirt-testing machines that position the shaft and CB the same with each test. If the tip shape is different from one shaft to the next, the effective tip offset will be different, creating a slightly different amount of squirt, with everything else being equal. This could have an adverse effect on squirt-testing results. In comparing shafts, identical tips should be used. Each shaft should be tested with the same tip size, shape, height, hardness, and weight.
Tip height can also have an effect on the amount of squirt (CB deflection) a shaft creates, especially if there is a heavy ferrule (e.g., brass) on the shaft. Pushing the heavy ferrule weight back from the CB (by using a taller tip, which is much less dense than the ferrule) even a little can make a significant difference on the shaft endmass and resulting squirt. Diagram 4 in "Squirt - Part VII: cue test machine results" (BD, February, 2008) documents experiments done to show the effects of mass at different distances from the CB.
from Patrick Johnson (from AZB post):
(The diagram above) shows four tips touching the cue ball at 30° offset from center (about halfway from center to edge), which is about where the miscue limit is no matter what the size or shape of your tip.
There are two shaft diameters shown: top = 12.75mm; bottom = 10mm.
There are two tip shapes shown: left = nickel radius; right = dime radius.
As you can see, the larger diameter shaft (at top) contacts the cue ball farther from its edge at the miscue limit, and there's room at the edge of the tip to spare with either tip shape. This is because a 60° arc (30° in each direction) on a nickel or dime radius is smaller than 12.75mm wide.
The smaller diameter shaft (at bottom) still has a small amount of room at the edge of the tip with the dime shape, but is right on the edge with the nickel shape. This is because a 60° arc (30° in each direction) on a nickel radius is just about 10mm wide and on a dime radius it's just a little less than 10mm wide.
- Nickel or dime radius only makes a difference on very small diameter tips.
- On very small tips it's better to have a dime radius than a nickel radius.
from Patrick Johnson (in AZB post):
The scale drawing below shows an overhead view of three cues hitting three cue balls at different offsets - cue moved 1/4", 1/2" and 3/4" to the left. Just for fun, it also compares where nickel and dime shaped tips contact the CB at those offsets, assuming the cue's centerline is offset the same amount.
I notice two interesting things:
1. These three very common tip offsets - often called 1, 2 & 3 (or 1/2, 1 and 1 1/2) "tips" - produce almost exactly 1/3, 2/3 and 3/3 of maximum sidespin (the red lines on the CB), which correspond to 1, 2 and 3 diamonds of cross-table angle change. I just find this correspondence remarkably convenient.
2. The difference in contact points for nickel and dime shaped tips (shown by the circles at the cues' tips and the lines connecting their centers with the CB's center) is almost nonexistent: 1/128" at 1/3 max sidespin, 1/64" at 2/3 max sidespin and less than 1/32" at maximum sidespin (true for nickel and dime tips of any width). So how true is it really that a dime shaped tip can produce noticeably more spin for the same tip offset?
What are differences among solid, layered, and milk dud tips ... Got Milk?
from Chris Renfro (in Facebook post):
What makes a good tip? The short answer would be Durability, Consistency, Ability to Hold Chalk. There are other factors that come into personal choice such as elasticity, hardness, appearance.
Durability comes down to how long with the tip play like it is graded.. Generally if you start out with a soft or medium tip the days are numbered until the tip ends up moving up the scale in hardness. Most tips will end up around 76 on a shore D over a period of time. Since the changes happen gradually most people don't really notice the changes unless they are paying very close attention and have the ability/playing level to detect subtle differences in spin and speed. Generally when most people notice is when they swap out to a new tip and go "Wow!!" and have to adjust to how it plays. Many pros are now changing tips on a schedule and not waiting until they have changed drastically so they are always going to be playing with a tip that is in a very narrow range. Many pros also are playing harder tips for the same reason.. Hard tips are already 76 or higher. They may glaze or they may lose some elasticity but overall they will stay the same longer.
Durability is an area where a single layered tip generally will win out over a layered tip. Soft and Medium single layered rely not only on how hard they are pressed but also the size of the fibers in the leather selected. This is why even if you over press something like an elk master you will never get it to be a true hard tip.
Consistency is pretty much being able to count on each and every tip being the same as it's brothers and sisters and being the same from batch to batch year to year. This is where most people assume that layered tips have the edge and for the most part that is a true statement for the PREMIUM layered tips.
To make a premium layered tip the first step has to be layer matching the leather. Each layer needs to be the same thickness, same hardness and the same elasticity for the tip to be consistent. If you wonder why Navigator uses the vivid colors it is 2 fold... They catch you eye but the colors help them group the different layers together for assembly. No danger of having soft layers mixed in with hard layers and vice versa. You do not see this form of consistency in non-premium layered. If you are dealing with a tip that is coming off the line in different hardness grades so they have to grade after the fact it is because the layers were not matched and yo may find that after trimming the hardness was not as advertised. After testing many tips I can honestly say that many tips on the market come in at different hardness grades than they are sold as. This is why some times you can get the exact same tip and not like it or if it is a premium you can likely assume that your source may be compromised and you got a fake.
The second most important part of the layered tip is the adhesive selected. As most people know when Navigator came to the market they were infamous for delaminating. Once they corrected the issue they have garnered a large following.. Think about the layer matching next time you see one and you might understand a little more about the thought process behind their colors. Also think about that the next time you see a tip with different layer thickness. coloring between layers, inconsistent glue lines, or furrowed dome. If the layers are not consistent then tips cannot be.
The consistency of a single layered really depends on the leather that was used to make the single layered.. Where the layered tips use layers that are skived to a specific thickness plus or minus a very small amount because of the scarcity of thick enough hides to make single layered they are not generally skived that consistently. When you get a single layered that popcorns on install or refuses to hold shape you have gotten a single layered that was likely made from a section of hide that was not uniform and one side was thicker than the other before they roll pressed the hide to prep it. We can usually identify these tips when we fat liquor the leather but other makers do not fat liquor as part of the processing so while we have a few still escape into the wild they have a larger percentage sold. During QC we toss out about 20-25% of the tips we start with because of consistency problems.
Holding chalk. LOL well that should be a no brainer but it is not. Most layered tips are made from pigskin which is a very tight leather grain to start with. Making a layered tip out of other leathers is done but most other leathers are looser grained and lower in elasticity so using them makes little sense.. Japanese Pigskin being the Cadillac so much that many tips being made from baked Chinese pigskin pretend to be Japanese but they harden so fast that you likely will know and the jig is up which leads to chemical treatments so that doesn't happen. While improving the COR and durability this makes for a tip that is very tight grained when talking about pigskin and as such will not take a bunch of chalk as the surface is relatively smooth compared to other tips and glazes fast. This can be handled either thru maintenance or by using a premium grade of chalk as it will slow down the glazing that occurs from the tip slipping during contact with the cueball. Basically glazing is the same thing as burnishing the sides of a tip you are just burnishing the top with the cueball.
As far as single layered you can have those glaze as well over time. Water Buffalo is the tightest grained leather used in a single layer and as such is the most likely to glaze. With single layered and layered using a small piece of fine sand paper or a maintenance tool that is not overly abrasive should be all that is required to keep a tip accepting chalk and gripping the cueball... In the other aspects of a tip Elasticity has been mentioned. Think of it as bounce. Tips are nature's springs. Tips with more Elasticity play faster and in some instances you can actually feel the cueball jumping off the tip. For some people that is what they are looking for, while other players may hate that characteristic and feel like those tips are harder to control.
Appearance. Yeah buddy. Layered tips knock that one right out of the park with the pinnacles being the Kamui Clear and the Navigator alphas. Not only do they look great but you can see them from across the room. Marketing genius which has led to the skittles onslaught in the break tip market. We will discuss break tips next time.
Hardness. There are scales out on the internet that show Shore Hardness. Sadly they are most always in Shore A so they border on useless as the tip has to be prepped before it can be tested. Hardness generally cannot tell the tale completely by itself when using a measurement like Shore D which is the appropriate scale. I can hand you 3 different tips that all test as a 70 on Shore D and when you hit them each you would quickly realize one is a soft one is a medium and one is a hard tip. This come from the COR of the tip which is greatly determined by the leather chosen but that can also be impacted by the chemical treatments discussed earlier. Anytime you are trying to match a tip by a Shore number first thing you need to do is make sure the 2 tips are made from the same leather type. We use Shore D as a QC tool. We do not make a tip to a specific durometer rating but to a specific COR %. Generally speaking tho for layered tips since most are pigskin mediums are around 68-70 Shore D. The cueball is 100. Phenolic tips like on the BK2 are around 90, the Samsara is around 83 and ye old Elk Masters should be low 60s just to get and Idea. Generally the hardest leather tip that can be pressed is going the WB Black and it will top out close to 80 unless it has been soaked in something like an epoxy.
So what tip is best? The answer pretty much is a consistent one that lasts more than a week and doesn't glaze every hour on the hour. The rest is determined by your shaft and by your confidence in tip.
from PoolDawg (from link):
Solid leather tips are the most traditional style of tip. Popular examples include Le Pro, ElkMaster, and Triangle. Basically, they take a large piece of leather and punch a solid tip shaped cylinder out of it. Because they come from a real piece of leather, minor blemishes and defects in the leather itself can cause these tips to be a little inconsistent, and tiny gaps in the leather can cause issues like mushrooming, which can then lead to miscues. Regardless of that, these tips are incredibly popular, usually inexpensive, and they’re still preferred by a lot of old-school shooters to this day.
Because of the inconsistencies in solid leather tips, companies developed layered leather tips in the 1990s and tips from companies like Tiger, Kamui, and Moori have been popular ever since. Layered tips are made by stacking anywhere between six and ten thin sheets of leather on top of one another and then punching out 14mm cylindrical tips. This modern process has greatly increased the durability and consistency of tips, and layered leather tips are the most popular style today.
Milk duds are soft solid leather tips, usually ElkMasters, that have been soaked in milk and then compressed to a certain thickness or hardness. The amount of soaking time varies, but it seems like most people do it for around 24 hours. The idea is that by soaking these tips in milk, the fats in the milk are absorbed evenly by the tip, bonding to the leather causing it to swell up. Once the tips have been thoroughly soaked, they are then compressed, often between two steel plates or in a vice-like cue tip press. The compression dries out the tips, makes them denser, and hopefully gives them a more uniform hardness and feel. In short, you take soft tips and make them harder with milk and compression.
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