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.

Rotary Roller Diameter Calculation

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

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