The 20 Things That Must Happen in a Geometrically Correct Stroke

The Machine Concept

1. The Stationary Post (player’s head) accurately returns the Clubhead through the ball (Centered Arc).

2. The Post may turn (Pivot) but does not “sway” or “bob”.

3. There is no wobble in the Clubshaft attachment (Grip).

4.The Hinge Assembly controls the Clubface alignment.

5. The Clubshaft lies full length on a flat, tilted plane.

6. The Clubshaft always points at the Plane Line except when they are parallel to each other.

7. The Lever Assembly is driven by exerting pressure against it.

8. No portion of the Lever Assembly can swing forward independently.

9. Regardless of how the Lever Assembly is driven, it moves in a circle.

10. The Lever Assembly must be driven though Impact by an On Plane force (moving toward the Plane Line).

11. Clubhead Force and Motion is On Plane at right angles to the longitudinal Center of Gravity and varies with the Speed, Mass and Swing Radius.

12. Ball Speed is dependent of both before Impact and after Impact Clubhead Speed.

13. The Clubhead travels Down-and-Out until it reaches its “Low Point”.

14. Divots are taken “Down-and-Out” – not just “Down”.

15. The Club starts up-and-in after “Low Point” but the thrust continues Down Plane during the Follow-Through.

16. The Plane Line controls the Clubhead Line-Of-Flight. Clubface alignment controls the Ball Line-Of-Flight.

17. The Clubface needs to be square to the Line-Of-Flight only at Point of Separation.

18. Changing the Plane Angle has no effect on the Plane Line.

19. Stance Line, Plane Line and Flight Line are normally parallel.

20. For any given Line Of Compression (through the ball) every Machine must produce identical Impact alignments.

21. The relations of all Machine positions and motions can be described by a geometric figure.

Source: The Golfing Machine, by Homer Kelley. 1-L The Machine Concept.