Rotary Enabled - Alter steps on the fly?

Fixing to burn some circles on mugs.
Does the Rotary option being enabled alter the dimensions ?

I will be engraving the mug turned sideways, so top and btm of mug is in X axis.

To make the Circle not come out oval, should I squish the image 10% in the X axis, or just run it. ?

Once a wheel rotary is set up properly there is no need to change any of the settings.

A rotary is just a ‘round’ y axes.

During the setup you entered steps/rotation of the motor * the gear ratio. With the ‘wheel’ diameter it computes that the wheel moves the surface of the object the same as the y axes.

A chuck rotary will require the diameter to compute the surface speed.

If it’s set up correctly there should be no need to change the artwork. A circle on the y table should reproduce a circle on the rotary… that’s the whole idea…

Good luck

:smile_cat:

understood, saw a post mentioning that LB alters steps.

ok, So Lightburn doesn’t modify anything being sent, so measured X and Y are perfect.

Just curious about the optical illusions I have heard of circles being oval wrapped around mug.
Suggestions?

That is configuration of the rotary.

If you have a tapered mug or some other not linear shape it will distort the image as much as it’s taper.

Good luck

:smile_cat:

ah, ok, so its not the curve of the mug that makes it oval, its the taper from top of mug to btm.
thanks

The idea of a rotary is to handle cylindrical type object. It runs the rotary same as the Y axes…

If a mug doesn’t have same size top and bottom then it is shorter at one end and that will cause a distortion because the drive wheel can’t move the same amount with a smaller diameter at one end than the other.

When you turn a circle in a car the outer wheels have to go further then the inner wheels… That’s just physics…

Generally, with tapered objects, the rotary is ‘tiled’, keeping the material in focus.

:smile_cat:

So RTIC 30 oz tumbler has a very slight taper on top section, leaving close to a 3" x 3" foot print.

Found that normal circle comes out too tall, so I turned off the LOCK for aspect ratio, and squished the top and bottom of circle by 11%, changing it from 100% to 89%.

This made the oval come out more like a circle.

1 Like

This topic was automatically closed 30 days after the last reply. New replies are no longer allowed.