Archive for the ‘technology’ Category

KAMUI Chalk Performance Test

This test is to check the performance of  KAMUI CHALK.

This test is conducted under the following condition.

1, Shot by the same player.

2, Focused only on maximizing the amount of cue ball spin over the distance of ball diameter for 2 types of chalk.

Therefore the shooting speed of 2 chalks are not the same.

What we found out are as follows,

1, It is possible to shoot more off-center of the cue ball with KAMUI Chalk than the other chalk brands.

2, It is possible to shoot with higher speed than other chalk brand regardless of its wider sweet spot.


KAMUI  CHALK enables players to shoot more off-center with higher speed than other chalk brands.

This is why KAMUI Chalk can offer more spin and prevents miscue.


Back Spin Version


Side Spin Version

KAMUI Chalk Performance Test

This test is to know how much more spin KAMUI chalk can generate compared to other chalk brand.

The distance between the center of the ball and pin in this video is equal to ball diameter.

Due to the lager sweet spot of KAMUI chalk, you can shoot more outside of the cue ball.

This is why KAMUI chalk can generate more spin and prevent miscue.

We found that the ball shot with KAMUI chalk rotates 60 degrees more than other chalk brand when it passes over the pin.

KAMUI chalk offers players greater spin that they have never experienced with other chalk brand.

How to install KAMUI CLEAR

How to install KAMUI CLEAR.

The performance of KAMUI Chalk

In this chapter, I would explain how billiard chalk works and the perfromance of KAMUI chalk.

The performance of billiard chalk depends on how much frictional force the chalk creates between the cue ball and tip against the slipping force.

To have greater frictional force,

1, Increase area of contact between the cue ball and chalk particles.    The contact area becomes larger by making the particles of the chalk much finer.

2, Make the particles of the chalk more solid and sharper so that the particles can bite into the surface of the cue ball.
After long reserch, we finally found the ideal material that has the 2 importhant facotors above.
This is why KAMUI chalk can prevent miss-cuing compared to standard chalk, and this peformance gives the player a larger shooting area. (Larger sweet spot)


Understanding cue ball deflection

In this chapter, I would explain the reason why cue ball deflection happens. To keep the explanation brief, the frictional force between the cue ball and cloth is not considered.

Step1: Before everything, please understand that when you shoot the left side of the cue ball, the cue ball would deflect and go the right direction. Imagine when you try to move an object ball to right side, the cue ball has to be hit on the left direction of the object ball. This is the basic machanism of cue ball deflection.

Why does the cue ball deflect?

When you apply English on the cue ball, the cue force is divided into diagonal movement that is directed to the center of the cue ball and tangential force & spin rotation.

The reason why cue ball deflects, when hitting the cue ball with side english, the force of the cue ball is divided into a diagonal direction and tangential direction. From a physics point of view, the cue ball travels to a direction that comes from the force of vectorX-A and X-B as the picture below shows. This is how cue ball deflection is calculated.

If we deeply understand why deflection is caused, we are able to reduce it. In the case of picture above, reducing vectorX-B and increasing vectorX-A bring about less deflection.

This picture shows how deflection is decreased. Increasing vectorX-A and reducing vectorX-B changes cue ball direction that is dependant of the resulting force. Cue ball path shifts direction X-C to X-D when vector X-A is increased.


It is a common way to use low deflection shafts to reduce deflection. Furtehrmore, KAMUI chalk also can reduce it. I would explain how KAMUI chalk works to reduce defleciton on ‘KAMUI chalk reduces deflection’ page.

Cue tip maintainance after miss-cueing

It is very important to maintain a cue tip properly after miss-cueing. After a period of time and impacted chalk on the surface of the tip the tip becomes slippery or smooth.


KAMUI TIP Installation Guide

There are some points you have to pay attention to when installing a KAMUI tip.

1,When the tip reaches over 60 Celsius by frictional heat, the layered glue of KAMUI tip starts to get soft.

therefore, try NOT to cause frictional heat in all the process.

2, Always have a sharp cutting tool. Cut towards the ferrule and NOT away from the ferrule.

3, You can use a razor blade to trim the diameter of the tip to match the diameter of the ferrule. No need for excess strain on the tip such as pushing or pulling while cutting the tip. If your cutting tool is sharp the tip will not experience any damage.

4,When burnishing the side of tip with sandpaper, please always pay attention to frictional heat. Check the heat with your finger often and keep burnishing.

How to replace a cue tip by hand*tools and video instalation guide

KAMUI tip Installation guide by hand

This is a video installation guide of cue tips. All process is done by hand not a lathe.


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