Step 1: Materials
3/16” plywood sheet cut to a 24” x 18” rectangle
Step 2: Equipment
Any shape you want rastered onto the surface of your coaster (or other object) should be included in a similar file. This can include vectors with large widths or any arbitrary bitmap. In this example I included a circle with a width of 4 pt in CorelDraw along with the text “Made at TechShop” centered within the circle.
Turn on the laser cutter with the switch on the bottom left side of the instrument.
Hit the X/Y Off button on the instrument. Press Go to release the arm of the instrument so that you can reposition it manually. Open the instrument’s lid and push the horizontal bar all the way to the back of the instrument. Lift the three guard bars that hold the grid down in the instrument. Lift up on the front of the grid and remove it from the instrument without hitting any of the sensitive pieces of the laser cutter. Ensure that the grid is clean, then replace and reattach the three guards.
Place a white sheet of paper on the tray beneath the mirror and look at the mirror from the side to ensure that it looks clean. If it isn’t clean, contact the instrument’s owner.
Set the piece size to the printable area of the laser cutter, 24” x 18” for the laser cutter used in this guide. Set raster resolution to 300 DPI, select a Combined job type, set the raster speed to 60%, the raster power to 90%, the dithering method to Stucki, the vector speed to 20%, the vector power to 90%, and the vector frequency to 500 Hz. These settings will work for 3/16” thick plywood. For an acrylic sheet see the recommended settings included in TechShop’s laser cutter guide or for a rough estimate use the above settings but change the vector frequency to 5000 Hz. Click OK to accept your laser cutter settings. Inspect the cutting pattern preview in the print menu and if it’s acceptable click the Print button.
A final note: DO NOT use Auto Focus!
Monitor the cutting process. If you see excessive flame or anything out of the ordinary, use the safety procedures given to you when you were trained on the laser cutter.
Once the cutting is complete, wait 30-60 seconds (especially with any plastic substrate, which can produce toxic fumes when burned) for the system ventilation to remove combustion products. Then open the lid and remove your final products.
At TechShop, hit the X/Y Off button, followed by the Go button to confirm, and move the laser mirror to the upper right corner of its movable area. As soon as you clean up your debris and power down the instrument, you're done.