We sometimes get asked what makes the OnePuttPro Smart Putting Aid work? To help answer that question we are providing a boiled down idea of how a device that attaches to the shaft of your putter just below the grip can accurately sense and record the six key putting metrics.
We’re not going to bore you with the volumes and volumes of calculations and algorhytms and so on. We promise, it’s boiled down but you’ll still get a good peek at that science or rather the physics justification for each metric:
Core Principle: Rigid Body Rotation
A putter shaft is a rigid body. When a rigid body rotates, every point on it experiences the same angular displacement and angular velocity. The orientation measured at the grip is identical to the orientation at the head.
Face Angle, Loft Angle, Lie Angle
Face Angle (rotation around vertical axis).
Loft Angle (rotation around heel-to-toe axis).
Lie Angle (rotation around forward-back axis).
Measurement: These three metrics all use the Euler angle (yaw, pitch and roll, respectively).
Why position along the shaft doesn’t matter: An angle is a pure rotation measurement. When the putter rotates in any direction, the whole body rotates together. An angle will always be the same, no matter how far from the vertex you measure it.
Tempo
Tempo (back stroke:forward stroke time ratio).
Measurement: Time intervals detected by the gyroscope (rotation sensor)
Why position along the shaft doesn’t matter: This is purely time-based. The gyroscope detects when rotation starts, reverses, and when impact occurs. These timing events are detected by angular velocity thresholds, which are identical everywhere on the rigid shaft.
impact off center
Off-Center Impact (heel/toe contact point)
Measurement: Gyro Z-axis spike at impact (twist around shaft axis)
Why position along the shaft doesn’t matter: An off-center hit causes the putter to twist around its long axis.
This twist produces angular velocity, which is the same magnitude at every point along the shaft. The gyroscope measures degrees/second of rotation, not the tangential speed of any specific point.
Acceleration at Impact
Acceleration at Impact
Measurement: Linear acceleration in forward direction.
Potential concern: Linear acceleration DOES vary along a rotating body (a = αr). Points farther from the rotation center move faster.
Why position along the shaft doesn’t matter: For the pendulum-like motion of a putting stroke, this linear acceleration is primarily translational. The entire shaft accelerates forward together through impact. By removing gravity, we measure only the motion component, which is consistent along the rigid shaft.
Our Recommendations and Why We Make Them
Why we recommend placing the OnePuttPro device directly under the grip.
- Because you don’t want any extra weight near the face of the putter, potentially interfering with your stroke.
- Because you don’t want anything interfering with your line of sight.
Why we recommend aligning the device within a 90 degree angle of the face putter.
- Because rotation does matter – after a certain angle, the mpu will shift direction, meaning what it considers “forward motion” changes, so to get the most accurate reading you want to stay within 90 degress of the putter face.
Ready to Get OnePuttPro?
OnePuttPro is the ultimate putting training aid makes it easy to analyze your stroke so you can start making adjustments for 10X more confidence on the greens.
This cutting-edge putting aid attaches to your putter and provides real-time feedback on the following metrics:
