Objective
Use a six station Geneva Wheel for the sequential gearbox barrel cam. The test rig sketch is for constant rotation in one direction. This initial test is to prove the mechanism is functional with the current stepper motor. The objective is to achieve a faster response time and rotation of the barrel cam on a test rig before adding the Geneva Wheel mechanism to the sequential gearbox.
Resources and References
Geneva wheel geometry based on YouTube video by J.E. Johnson - [ Ссылка ] the video explains the Geneva Wheel mechanism principal and easy to understand.
Stepper motor sketch based on tutorial by Benne-de-Bakker TB6600 Stepper Motor Driver with Arduino Tutorial [ Ссылка ]
Toggle (Tactile) switch based on the tutorials ARDUINO TUTORIAL 28: USING A PUSHBUTTON AS A TOGGLE SWITCH by Mr Paul McWhorter [ Ссылка ]
ARDUINO TUTORIAL 34: SIMPLEST WAY TO USE A PUSHBUTTON SWITCH by Mr Paul McWhorter [ Ссылка ]
Stepper Motor and Stepper Driver Details
Stepper Motor Driver TB6600-4.0
TB6600 Stepper Motor Driver [Maker Hardware]
Current setting for 2.8 Amp - Pulse setting 3200
Stepper Motor - Nema 23 Stepper Motor 1.26N.m – Standard Torque
Nema 23 Stepper Motor 1.26N.m - Standard Torque - Maker Store PTY LTD
Tactile Buttons
PCB (Breadboard) Mounted Buttons
Tactile Button Assortment | Sparkfun COM-10302 | Core Electronics Australia (core-electronics.com.au)
Shaft Hubs
Steeper Motor Shaft Diameter .25 inch
Pololu Universal Aluminum Mounting Hub for 1/4″ Shaft, M3 Holes (2-Pack) (robotgear.com.au)
Geneva Wheel Shaft Diameter 8.0 mm
Pololu Universal Aluminum Mounting Hub for 8mm Shaft, M3 Holes (2-Pack) (robotgear.com.au)
Geneva Wheel Shaft
8.0 mm Stainless Steel
Stainless Steel Bar – Square Bar & More | Eastern Suburbs Stainless (easternstainless.com.au)
Bearings
Single Row 8.00 Ball bearing
Deep Groove Single Row 5-9 mm :: Universal Bearings 
Geneva Wheel Mechanism Design Parameters

Index Six Station Values (mm) Formula
1 16.0000 a = drive crank radius
2 6.0000 n = driven slot quantity
3 4.0000 p = drive pin diameter
4 0.2500 t = allowed clearance
5 30.0000 180/n
6 0.5000 sin(180 / n)
7 32.0000 c = center distance = a / sin(180 / n)
8 27.7128 b = Geneva wheel radius = √ c² - a²
9 11.7128 s = slot center length = (a + b) - c
10 4.2500 w = slot width = p + t
11 10.0000 y = stop arc radius = a - ( p 1.5 )
12 9.7500 z = stop disc radius = y - t
13 16.8875 v = clearance arc = bz / a
14 1024.0000 c²
15 256.0000 a²
16 768.0000 c² - a²
Units - mm and Degrees
Arduino Sketch Detail
Sketch Name - Geneva-03.ino
Sketch Link
[ Ссылка ]

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