When I’m using the rotary, my image resizes. How do I get it to engrave the exact size I have set. it also changing round into ovel.
Did you click on ENABLE ROTARY?
Did you set up your rotary I der the laser tools window?
Did you confirm your settings with a physical test?
There are many many videos on YouTube that detail how to set up and tune the rotary settings.
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Yes, “Enable Rotary” is on.
Yes, the rotary is set up under Laser Tools → Rotary Setup.
Chuck rotary is selected.
Object diameter is correct, circumference is correct.
Test rotation works.
The issue is this:
- In the workspace the artwork is exact size, for example 1.75" × 2.50".
- After engraving on the rotary, the result is shrunk: around 7/8 tall and 2" wide.
- Circles turn into ovals.
- This happens even though the artwork is not being resized in LightBurn.
So LightBurn seems to be scaling the output during the rotary wrap, even though the diameter and circumference are correct.
What setting controls THIS scaling?
Make sure that your “mm per rotation” are correct. I had to use trial and error until I found the correct setting as user manual for rotary device was wrong ( Acmer ). That will affect the Y axis. Why your X axis is also going out ….. I’m not sure. Have you checked your $100 and $101 in “machine settings” ? If you engrave 1.75” x 2.50” on a flat surface and they come out 100% then these should be the same on a round surface on rotary device. Have you set anything in “Taper Warp” ?
If your doing a design with a circle on a curved mug the circle may look oblong because of the way our eyes work. But if you measure the design it really isn’t an oval but round. The way to correct that is to make the design oblong in Lightburn. Here’s some instruction on how to correct that. This is a word document so download it then remove the .txt extension from the file name.
Just an FYI this is not the same as using the Taper function when doing a tapered mug. Using taper will not correct this and only adjusts the design from top to bottom to account for a mug with a large taper from top to bottom. Personally, i have never found the need to use taper as the mugs i use don’t have much of a taper and it doesn’t seem to effect my design. I would think you would only need to use taper if you have a design that covers a large portion of the mug from top to bottom. You could probably do the same thing as Taper by using Warp Selection or Deform Selection to adjust design for a tapered mug but that would be more of a manual process.
Oblong Design on Mugs.txt (14.3 KB)
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