Controller for a drill

Inventors: Bruce McRae Allen (Glen Forrest, AU); Hans Kunz (Bayswater, AU); Thomas James Drummond Clarkson (Attadale, AU); Kathryn Beech (Spearwood, AU); James Filear (Stoneville, AU); Carlos Uribe (Woodlands, AU)

Assignee: Bruce McRae Allen

B23Q15/08 B23B35/00 B23B45/02 B23Q15/12 B23B2270/32 B23B2270/36

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Quick Facts

Patent No.: US 12697696
App. No.: 18/037,572
Granted: Aug 4, 2026
Kind: B2

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Abstract

A controller for controlling a motor of a drill comprising an output of a signal for controlling a speed of rotation of the motor, a processor for producing the signal, wherein the signal is automatically varied according to a waveform, wherein one or more characteristics of the waveform is determined by a material to be drilled and a diameter of the bit.

Claims (20)

1 . A drill comprising:

a controller configured to automatically vary a speed of rotation of a bit according to a waveform, the waveform having a characteristic selected according to a material being drilled and a diameter of the bit;

wherein the controller provides the electric current output or a voltage output to the motor, and wherein the minimum current or voltage is offset from zero so that, when the speed of the drill is varied according to the minimum current, the drill bit is still rotating.

2 . The drill according to claim 1 , wherein the controller directly controls the speed of rotation of the motor.

3 . The drill according to claim 1 , wherein the waveform is independent of axial movement of the bit and/or force of the bit on the material being drilled.

4 . The drill according to claim 1 , wherein the electric current output varies so as to vary the output speed according to the waveform, where an amplitude of the waveform reflects the speed of rotation and a frequency of the waveform reflects the rate of variation of the speed.

5 . The drill according to claim 4 , wherein the frequency of the waveform is selected for one of at least drilling of steel, wood, hard rock and/or masonry.

6 . The drill according to claim 4 , wherein the characteristic is one or both of the difference between maximum and minimum amplitude of the waveform and the frequency of the waveform.

7 . The drill according to claim 6 , wherein the controller comprises an input for receiving the amplitude and/or the frequency of the waveform.

8 . The drill according to claim 7 , wherein the input comprises a selector for one of or each of the amplitude and the frequency.

9 . The drill according to claim 1 , wherein the controller is configured to apply torque to the bit during a part of the waveform having a negative gradient.

10 . The drill according to claim 1 , wherein the waveform is substantially a sinusoidal, sawtooth or a triangular waveform.

11 . The drill according to claim 1 , wherein the drill is a handheld drill.

12 . The drill according claim 1 , wherein the controller is configured to calculate the waveform.

13 . The drill according to claim 1 , wherein the controller is configured to store a plurality of waveforms and select one of the stored waveforms to automatically vary a speed of rotation.

14 . The drill according to claim 1 , wherein the controller is configured to provide maximum power to the motor when varying the speed of the drill motor according to peaks of the waveform, and wherein the controller is configured to provide minimum power to the motor when varying the speed of the drill motor according to troughs of the waveform.

15 . A drill comprising:

wherein the controller comprises an input for receiving the material and the diameter of the bit, and wherein the received material and the diameter of the bit is processed by the controller to determine one or more of the characteristics of the waveform, wherein the electric current output varies so as to vary the output speed according to the waveform, where an amplitude of the waveform reflects the speed of rotation and a frequency of the waveform reflects the rate of variation of the speed, and wherein the frequency is selectable for the material being drilled such that the bit rotates at a speed substantially optimized for a radial point on the cutting edge for long enough to cut the material at that radius before the speed changes to be substantially optimized for a different radial position on the cutting edge.