Screwcutting Tracking Ratio Tracking Ratio = Usually expressed as the lowest whole number ratio Eg. =1 = Magic # Lead of Work Lead of Lead Screw 1236 (The Magic # is used to determine the Starwheel or Chaser Dial details)
Screwcutting Tracking Ratio Tracking Ratio = Usually expressed as the lowest whole number ratio Eg. =5 = Magic # Lead of Work Lead of Lead Screw 1.256 524
Screwcutting Tracking the Thread Tracking the Thread means to engage into the same Thread groove on successive pass of the tool.
Screwcutting Methods of Tracking the Thread Starwheel Chaser Dial Reversing the Machine Repeat Distance Method
Screwcutting Starwheel A thin gear like disc with teeth cut of a size to engage with the Leadscrew of the Lathe
Screwcutting Chaser Dial Sometimes used in conjunction with a Starwheel to assist correct engagement of the Leadscrew
Screwcutting Reversing the Machine Reversing the Spindle is useful where a Thread with an unusual Lead needs to be produced Usually achieved by reversing the direction of the Lathe spindle without disengaging any of the drive gears
Screwcutting Repeat Distance Method Repeat Distance is calculated by multiplying the Tracking Ratio by the Lead of the Leadscrew
Screwcutting Threads Metric Threads available by direct selection
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