Rotary Laser Cutter
The rotary laser cutter is an attachment to the ULS VLS 6.60 Laser Cutter that allows you to change the mode of the cutter to Rotary mode. The attachment allows you to insert a glass into the holder and engrave a glass almost the same as if you were using the laser cutter normally.
Examples of engraved glasses can be found here.
How the rotary works
The cutter works by using the holder as a placement for the attachment and center line for the glass. After placing your glass in the clamps, the cutter needs to have a level piece of glass. If a glass is tapered down the side (caves in rather than being straight up and down) then it must be tilted upwards to offset the angle of the glass. The laser cutter works by projecting a laser through the side of the machine into a mirror inside the laser head. This laser is then run through a lens to be focused onto one point. The laser will only work at this one point and if there is no material there then nothing will cut. If the material is too close or far away, the laser will not hit the material at the focused point and nothing will cut.
After calibrating and making sure the top of the glass is level, the next step is just to print! The control program takes care of everything else as long as you set it to rotary mode and put in the thickness and diameter the printing program will show you how much space you have to work with.
Moving the laser also can only be done on the middle line of where the glass will be. The printer takes care of everything to do with rotating the glass and how to cut. The same principles work with the rotary where blue (.001") lines mean vector, and black/shaded colors mean raster. There is no cutting using the rotary as the glass would shatter.
General Process
Using the laser cutter in Adobe Illustrator
Fix this stuff later and add pictures
Using the rotary mode is only slightly different in adobe illustrator. The few key things that you must remember (will explain later) are:
- Set the laser to rotary mode
- Set the settings correctly
- Using the correct material (most glass is soda lime glass)
- Set material thickness
- Set material diameter
- Editing Pictures in adobe
- Set the correct sizing for the pictures
- Orient the picture the right way
- Distance multiple pictures correct distances apart
Rotary Mode
In order for the laser cutter to know that it should align pictures in rotary mode you need to set it as the print setting. To do this you need to go the print the file from adobe illustrator as normal. But before clicking print you need to go into preferences and print settings and this should bring up a popup box similar to the one from the Universal Control Panel (UCP). Near the bottom right there should be a drop-down box labelled Fixture Type. Click this and change it to rotary. This now changes anything that you print after to rotary mode until you change the setting back or restart the computer.
Now anything printed to the UCP with this setting will have the image aligned to the center line of the the glass. This means when moving the image in the UCP to align it where you want it to be printed, you cannot move the image along the Y axis. You are only able to move it left and right along the Z axis. This is because the program uses the diameter you need to enter in to give you the max surface area you can engrave on and everything is rotated according to how it is printed in adobe illustrator.
Rotary Settings
It is even more important to use correct exact settings when using the rotary because these settings are how the laser knows how to rotate the glass and how far away to situate the laser head. Incorrectly entering or forgetting to enter this information can cause damage to the laser or failed prints. The material thickness and diameter can be entered in the print settings before sending the print to the UCP or in the UCP settings panel.
The material thickness setting is used to know how intense the laser needs to be in order to engrave correctly. This can be done by using the digital caliper in the Prototype Studio and then entered into the settings dialogue box in the print settings in adobe illustrator or in the UCP settings.
The material diameter is the most important setting to set. If entered correctly, the UCP will not display the correct size of printable area. After this setting is entered, the UCP will change the size of the print area that shows where your print will be. Incorrectly entering this can cause things to be printed in the incorrect places on your glass. It might be a little difficult to measure a glass especially with curved/tapered edges. The general idea is wherever you want the middle of your print to be, measure the distance from the outside edge of the glass straight across and then enter that.
To be more advanced, you can edit your design to be tapered as well to conform to your glass but most of the time this is not needed. Any amount of tapering won't really affect the look on the glass.
Print Picture Editing
One complicated part of printing with the rotary is orienting and sizing everything correctly to be printed on the glass. The general idea for this is fairly simple, what you print on adobe illustrator is how it will print on the glass. All dimensions and orientation is translated over to printing onto the glass. This means whatever way your print faces on adobe is the way it will print and if it is 10 inches tall in adobe then it will print 10 inches tall.
The best way for sizing this is taking a ruler to your glass and seeing how tall you want your image to be. Then in Adobe Illustrator, just click the image or text and resize it to whatever height that is. This can be done by clicking the image and going to the properties of it and clicking the lock icon to lock dimensions (if preferred) and entering the height you want.
The orientation of the print is exactly how it looks in adobe. So if the image is vertical in Adobe, it will be printed vertical as if you are looking down into the laser cutter from the front. This will bring up problems if not addressed because it will print horizontal on your glass since the glass faces left to right due to the rotary attachment. Generally, this is a really easy fix and just requires you to rotate everything 270 degrees for the top to be on the right and bottom on the left.
Sometimes, you might want to print two images, directly across from each other on the glass. This is fairly simple as well. In Adobe, you can right click and select show rulers. After setting the sizes of the images as you want you can start positioning them (Recommend doing it up and down before rotating them as you can do that in the end). You can double click along the ruler on the top at a certain mark, say 4 inches. Then take the first image you want and align the center of it with the line created with the ruler. Now you need to figure out the exact opposite point on the glass. This is just Circumference/2 or (Diameter*Pi)/2 or (Radius*Pi)/2. So lets say our radius was 3 inches, the circumference would be 9.42 inches. You would want the center of the images to be exactly 4.71 inches apart. So now create another line using the ruler at the first line plus the calculated value. Here it's 4 inches + 4.71 inches so make another mark ~8.7 inches. Now align the center of the second image to the line and at the same height of the first image. These are now distanced properly but still need to be rotated by selecting both images (use select box on both or just shift click both) and right click -> translate -> rotate -> desired amount (normally 270 degrees). Now you can print it to the UCP with the correct settings and start laser cutting.
Complications with the Rotary
Types of Usable Glass
The general need for the glass to be able to be engraved is you need to be able to get it to have as flat a top as possible. (More information why this is needed is in the How the rotary works section). Glasses with smoothed edges will work the best, rough or bumpy edges might still engrave but have the possibility of coming out weird. Normal tall drinking glasses and straight glasses (like whiskey glasses) are the easiest. Even tapered glass can be fixed by raising the left end of the rotary attachment to even out the top.
Tilting the glass creates a straight top
Whiskey/Straight glasses already have the straight top
Wine glasses are trickier. Some wine glasses are fairly easy to use as they have almost straight sides. Champagne glasses are a good example of wine glasses that are easy to use. They have almost an entirely straight side meaning not much modification necessary. Some wine glasses are a bit more curved but can still work. The laser has a small window of ability to laser cut if things are a little off the line where the laser meets. There is some trial and error to see what types of glasses will work.
Champagne glasses have naturally vertical sides
These types of glasses are possible by using the largest diameter as the middle of your image
Mugs or ANYTHING with handles that can get in the way are NOT ALLOWED. The handles can hit the laser head and cause damage to the machine because of the rotating it does.
There are also complications with certain glasses if they are too short or thin. More of this information can be found in this Section. If you have questions or would like to know if engraving a certain glass is possible please ask a manager.