I wanted to say to jsp that the drawing he did about CP and CP or parallel lines that is on Dr. Dave site is really good at showing how the CB CP location changes with the change of angle of the CB from the GB center while the OB CP location does not.
This is a very improtant concept to understand when using GB. Before I found his drawing, I did my own and noticed this concept. When I went to practice and applied this concept to my aiming, I started feeling more confident in my aiming. There have been some really super thin cuts I was have trouble making, but understanding this concept, I started making them.
Of course it takes practice like any thing, but once you get the hang of it, its pretty cool.
Now, do ya have one showing how OB placement in relation to the pocket affects the margin of error for a shot? I have no way of doing such a good drawing like you did. Mines all old school, on paper with a drafting set.
Also, this drawing can be used to show another way to use point aiming. Think of the red dashed lines as CB direction of travel. The black dash line as the OB direction of travel and of course the black arrows as the cue. In this discussion, I am talking about a center ball hit on the CB and such a speed at the is no CIT involved. This is more about a concept than anything.
Notice that the center pocket point, OB center, OB CP and GB center are on the same line, the OB direction of travel. The end of the arrow,cue stick, points straight at the GB center. Notice too that the GB center is 1/2 width from the OB CP. By the way, Babe Cranfield arrow shows this point had used. This is why it is the best training aid for GB ball out there.
Consider that the OB center, GB center, CB center points as contact patches, the area where a ball meets the table instead as a center of sphere.
Consider the part of the red dash lines on the shooters side of the CB as lines where the cue needs to stroke straight over for a center ball hit on the CB.
If there is a bottom point on a sphere, there is a corresponding point on the oppisite side, that CB contact patch point is point oppisite it and both are on the same CB direction of travel line, so, just use the top of the CB to aim at the GB center or contact patch, or if you use the arrow, the arrow point.
The OB direction of travel has a pivot point which is also the OB contact patch. The reason I say this is because if you move the GB around the OB, the direction the OB travels moves, pivoting at the OB contact patch.
So, the start of the OB direction of travel line really starts at the GB contact patch. Since a pocket is bigger than a ball, there is room for error. This is where the distance and angle from the pocket a OB is comes into play.
The line between the GB contact patch and the OB contact patch is always a constant. The OB direction of travel has a end point which is somewhere in the pocket. In the drawing, that point would be center pocket.
The amount the OB directional of travel end points moves when the GB contact patch is moved around the OB varies based on the distance from the pocket the OB direction of travel line pivot point is.
Anyway, a short write up on another to to look at point and lines.
This is a very improtant concept to understand when using GB. Before I found his drawing, I did my own and noticed this concept. When I went to practice and applied this concept to my aiming, I started feeling more confident in my aiming. There have been some really super thin cuts I was have trouble making, but understanding this concept, I started making them.
Of course it takes practice like any thing, but once you get the hang of it, its pretty cool.
Now, do ya have one showing how OB placement in relation to the pocket affects the margin of error for a shot? I have no way of doing such a good drawing like you did. Mines all old school, on paper with a drafting set.
Also, this drawing can be used to show another way to use point aiming. Think of the red dashed lines as CB direction of travel. The black dash line as the OB direction of travel and of course the black arrows as the cue. In this discussion, I am talking about a center ball hit on the CB and such a speed at the is no CIT involved. This is more about a concept than anything.
Notice that the center pocket point, OB center, OB CP and GB center are on the same line, the OB direction of travel. The end of the arrow,cue stick, points straight at the GB center. Notice too that the GB center is 1/2 width from the OB CP. By the way, Babe Cranfield arrow shows this point had used. This is why it is the best training aid for GB ball out there.
Consider that the OB center, GB center, CB center points as contact patches, the area where a ball meets the table instead as a center of sphere.
Consider the part of the red dash lines on the shooters side of the CB as lines where the cue needs to stroke straight over for a center ball hit on the CB.
If there is a bottom point on a sphere, there is a corresponding point on the oppisite side, that CB contact patch point is point oppisite it and both are on the same CB direction of travel line, so, just use the top of the CB to aim at the GB center or contact patch, or if you use the arrow, the arrow point.
The OB direction of travel has a pivot point which is also the OB contact patch. The reason I say this is because if you move the GB around the OB, the direction the OB travels moves, pivoting at the OB contact patch.
So, the start of the OB direction of travel line really starts at the GB contact patch. Since a pocket is bigger than a ball, there is room for error. This is where the distance and angle from the pocket a OB is comes into play.
The line between the GB contact patch and the OB contact patch is always a constant. The OB direction of travel has a end point which is somewhere in the pocket. In the drawing, that point would be center pocket.
The amount the OB directional of travel end points moves when the GB contact patch is moved around the OB varies based on the distance from the pocket the OB direction of travel line pivot point is.
Anyway, a short write up on another to to look at point and lines.
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