Last week I learned to use the rotary attachment for the Trotec Laser. Usually this attachment is used to etch cylindrical and conical objects like glasses and bottles. I wanted to try something different, something... spherical. Also, I wanted to etch some leather. Putting two and two together, I decided to etch a baseball.
I'm not really crazy about the design on this ball - it was sort of a 2nd draft to work out the kinks in the process - but I thought I'd take a break and get this Instructable written.
I've attached the template i used for my design as a PDF.
Step 1: Materials and Preperation
If you want to etch a baseball, do not use one with a synthetic leather cover. The type of synthetic leather used contains PVC. According to wikipedia, "plastics with a chlorine content (such as vinyl, PVC) produce corrosive chlorine gas when lasered, which combines with Hydrogen in the air to produce vaporized hydrochloric acid which can damage a laser engraving system."
I sanded the markings off my baseball. It seems to me you should probably be able to buy baseballs without any logos or anything from somewhere out there on the internet, but I haven't really looked.
Toilet Paper Roll
Without the toilet paper roll or some other cylindrical/conical object, one side of the rotating bit on the rotary attachment will be in the way of the laser. (If that's not clear, see the attached picture of the ball in the attachment.)
Step 2: Design
Credit to vectorgeek at deviantart.com for making this baseball pattern. The baseball cover shape from his design got me about 80% of the way to a usable template for etching my baseball. After some trial and error, and some stretching and resizing, I arrived at my template.
My template is still a smidgin off (it's a little too fat at the center and too skinny at the bulby parts), but I'm attaching it as PDF. If you fix it up, let me know!
Step 3: Laser Settings
Step 4: Clean Up and Deodorize
Also, burnt leather smells more or less like burnt hair. Not much to be done about stinking up the the shop, but unless you like the smell of burnt hair, I suggest setting your baseball outside for a day or two before taking it into your home.
With these final two steps finished, you're ready to display your baseball!