Circle Projection on Tumbler
This article provides an excel spreadsheet to be used to calculate the skew needed to adjust a circle onto a Rotary Surface.
Prior to using this sheet, make sure you steps\roller diameter are correct for the cup you are lasering onto.
How to use:
Enter the values in the blue rows:
Circle Diameter - Get that value from your artwork in Lightburn
Cup Diameter - Measure the diameter of the cup where you are engraving
Green Rows : FYI only
Orange Row: Output skew percent, enter this into lightburn.
In Lightburn:
Unlock the X and Y Axis sizing and then enter the skew value for the X axis, then rotate your art and set it up for the Rotary. In this example a 2.75" circle with the X axis skewed by 3% results in a 2.8325x2.75 oval