How draw and follow affects bank shots?

[CeaseLess]

I'm aware that speed and table conditions and distance from the object ball to the rail all make a difference. But those things aside, how does draw and follow affect bank shots? Say I have a cross side bank, the object ball is close to the rail and i have to hit it hard but i still need to shorten it up a bit. I assumed that since putting left and right english transfers the opposite english to the object ball, that top and bottom does the same. Which would mean that drawing the cue would put follow on the object ball, which would make it bank long or wide of its natural line. Am I correct to assume this?

 

[MitchAlsup]

A draw shot increases the angle off the rail (and slows the CB velocity)
A follow shot deceases the angle off the rail (and increases CB velocity)
{Where the angle is measured from the rail to the line of ingress or egress.
If you consider the angle as normal to the rail the effect is opposite.}

Just last night I an an interfering ball with my ball within 2 inches of a corner pocket.
I had line of sight to the rail 3" farther that the ideal bank line.
I hit it with significant draw, and CB backed up to the desired angle.

Say I have a cross side bank, the object ball is close to the rail and i have to hit it hard but i still need to shorten it up a bit.

I generally find side spin less accurate than draw or follow.

I assumed that since putting left and right english transfers the opposite english to the object ball, that top and bottom does the same.

It is similar in that the reflection angle changes, Spin effects are linear and take place at the rail. Draw or follow effects have a bit of arc as CB changes from the natural reflection angle. A physicist would call this a second order effect.

Which would mean that drawing the cue would put follow on the object ball, which would make it bank long or wide of its natural line. Am I correct to assume this?

Without the rail being used, the above is accurate. With the rail being used, I am not sure.

 

[Bob Jewett]

You have to be careful with the setup. The tendency is to hit draw shots harder because you have to keep the draw on the cue ball as it slides out to the object ball, and speed changes shots.

I think you'll get the best answer to your question by setting up a test very carefully and doing your own shots on your own table.

But, if I had to guess without actually seeing shots on the table, draw will make the banked ball go slightly longer and follow slightly shorter, in some situations, all other things being equal.