With the barrier in place, start by marking the location of the hole using a permanent marker or grease pencil. Excellent for hand drills. First you need to drill a small diameter pilot hole to get started. Larger tip angles commonly cause cracking and blow out as the bit exits the sheet. But I am sure that you can find them at the internet too. Wear safety goggles. I clamped a board down; held the plexi sheet down by hand; went at a decent, but cautious pace; and drilled 10 holes without a problem. There are precautions that you must take to ensure that the hole does not get hot and melt the acrylic sheet or that the exit side of the acrylic sheet does not crack. Purchases made through these links may earn me a small commission at no additional cost to you. Standard metal drill bits will work, but without extensive modification, the metal drill bit will crack and chip the brittle acrylic sheet. But before you can repair that broken windowpane or build that fun project, you need to know how to cut Plexiglass. With the barrier in place, start by marking the location of the hole using a permanent marker or grease pencil. on Introduction. Insert an acrylic point drill bit into the chuck of the drill and set it to a medium speed. Drilling acrylic is not difficult if you have good tools and are drilling the right kind of acrylic sheet. They will "ride up" a conventional drill bit and crack. Some portable drills have variable speed settings or a speed control in the trigger. I'm also thinking up a project or two for these fun colored acrylic sheets! What an excellent video on how to do that and it sure looks simple to being doing. The gradually go up in drill bit sizes until you reach your desired diameter. If you just drill a pilot hole then jump right to a big size bit you will likely crack the plastic. Ahh, in that case being slow and methodical would help. Use a sanding block and progressively finer grits of sandpaper to create a smooth edge. Then arrange the straight edge so it's just slightly on the line and clamp it to the work surface. The problem with drilling plastic is that conventional bits will "catch" on the plastic, pulling the bit into the hole with more force than desired, typically cracking the plastic being drilled. on Introduction. ... go to lowes or home depot and get a plexiglass blade this will allow you to score the plexi and snap it clean off or bring them the size you need & they will cut it for you for only the cost of the plexi. Using step-up method to drill the hole will not eliminate this problem. I use standard bits, but I put the drill in reverse and go slower. Unsubscribe at any time. They will "ride up" a conventional drill bit and crack. It should break cleanly along the cut line. Use the saw at a slower speed, or keep the material cool by spraying water over the cut point during the saw operation. A ½ inch hole would require a ¼ inch pilot hole. I hope this post was helpful! Did you make this project? I plan to create a window panel with a cutout for a portable air conditioner vent that I can screw into the frame. Here are some examples . on Introduction. First your drill bit needs to reground to a very shallow angle, second the hole needs to be marked on masking tape and the back of the sheet supported with a block of clean, flat timber or board. This will stop any splitting or cracking. Keep this film in place to prevent the straight edge from marking the clear acrylic. The see-through sides make it easy for him to spot that elusive piece at the bottom. Slow to medium speeds work best when working with acrylics. Use an O flute up spiral plastic cutting bit to cut acrylic with a router. Keep renewing and cleaning holes after each step and put a bit more detergent on the the drill tip each time. Once you’ve nearly reached the other side, stop. 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