A backing piece of wood or acrylic will make a neater hole. Is it any more difficult to drill 1" thick acrylic compared to 1/2"? Using the wrong type of bit can result in the tool grabbing as you are drilling, which can lead to chipping at the edge of the hole. Catherine G. October 8, 2019. This point angle must be ground to 60-90°. If a countersink is unavailable, use a drill of larger diameter than the hole and deburr the rough edge on the exit side of the hole (side where the drill came through the sheet). If the drill bit is new, wear it in a little on a scrap piece of wood so that there is no risk of the sharpness tearing the acrylic. Do not try to pull it out. First, the bolt hole diameter should be at least 2 times the diameter of the bolt. When the hole has been completed and the “blank” has freed itself, turning the drill press off without removing the cutter, is desirable in order to prevent any chipping of the hole during tool exit. These drill bits must be reground in order to scrape the plastic instead of sharply cutting into the material and gouging it. As a result, feed rate must generally be slowed down in order to prevent chipping and consequently spindle speed must be reduced to prevent melting. However, in many fires sufficient air will not be available and toxic carbon monoxide will be formed, as it will when other common combustible materials are burned. To make it easier to … This information and all further technical advice is based on our present knowledge and experience. To prevent cracking, holes should not be drilled at a distance closer to the edge of the sheet less than 1-½ times the diameter of the hole itself. They are: For drilling acrylic the recommended values for SFM and IPR are given in the table below. Welcome Back! 3. Two parameters are usually employed for determining these. These bits have a different geometric structure that is designed to puncture acrylic more easily and they are less likely to melt plexiglass. Additionally there are times that holes need to be made, such as at a job site, where there is limited control of the exact speeds and feeds that are being used. It has an advantage over a spade bit because it has a helical flute design which will pull out chips. The customer is not released from the obligation to conduct careful inspection and testing of incoming goods. The special tip design carves through the plastic (not for use with wood or metal). The lubricant will also help expel any of the plastic chips from the hole as you are drilling. Be sure to firmly chuck the drill bit in the cordless hand drills or drill press. Zero flute countersinks work well for countersinking and deburring holes in acrylic sheet. The products of combustion, if sufficient air is present, are carbon dioxide and water. It is best to backup the piece being drilled with acrylic, other thermoplastic sheet or medium density fiberboard (MDF) so the drill bit will continue on into solid material as it penetrates the bottom surface. Additionally, peck drilling should be employed in deeper holes to reduce melting. If the sheet is thin, use a step drill bit instead. when your using a hole saw pre drill the guide drill hole first when you don't have a backing under where your drilling because when it hits through the opposite side its going to pull the bit in. I didn’t even know you could get drill and tap combined. These measures include drilling a pilot hole first. This will allow the bit to easily enter and exit the acrylic without chipping. The holes must have clean crisp edges. Manual drilling operations should be performed at slower speed and feed rates than automated or CNC drilling taking into account the diameter of the bit, material thickness, and ability to cool during drilling. These products are sold under the registered trade name ACRYLITE® in the Americas and under the PLEXIGLAS® trade name on the European, Asian, African and Australian continents. However, liquid coolants provide more cooling, as the liquid can trickle down the hole as the bit goes through the material, resulting in better hole finishes. They leave a poor finish on the inside hole. The previous sections dealt with controlled production and shop applications. Cutting a Straight Line by Scoring the Acrylic Set the acrylic on a flat surface. Taking breaks allows the plexiglass to cool thus reducing the risk of damage. The fly cutter and cutting tool itself must be secured properly. Cutting tool must only be extended enough to achieve the desired depth of cut. Both types of masking allow you to draw on the surface as you lay out your job. Larger tip angles commonly cause cracking and blow out as the bit exits the sheet. Sign In. However, when you are drilling a ¼” hole, the recommended speed of the drill should be reduced to 1,800 rpm. For instance, if the acrylic is 5mm thick, then the distance from the edge where you will drill is 10mm. Not sold online Available online Out of stock online. Spade drill bits can also be used with satisfactory results. ACRYLITE® sheet usually burns rapidly to completion if not extinguished. {{cart.count}} Get a Quote. Do not remove the surface protection masking prior to fabrication. 2. The back relief angle of the cutting edge ensures that the drill bit designed for plastic shaves slivers of material rather carving away large chips that could propagate cracks. Brad Point Bit (1/8" to 1") - this design is similar to a twist drill with a modified tip similar to a spade bit with spurs. T&C's apply. 1-800-553-0335. This includes portable drills, drill presses, lathes, automatic multiple-spindle drilling units, CNC routers and machining centers. Standard metal-working drill bits are designed to aggressively cut into metal as they are fed into it. 1 UK only; 2. Bits with 60° tip angles are also used, especially for holes with diameters of 1/2" and greater. grades. Sam R. October 8, 2019. This will prevent chipping of the bottom surface. White, colors, clear acrylics, cast, AR, LD etc. These bits come in a variety of diameters at home improvement or hardware stores. Drill bits are made of high-speed steel (HSS), cobalt, HSS with carbide tips or solid carbide. Acrylic and plastic are soft materials by nature, and power tools should be used with care. Plastic drill bits shave or scrape plexiglass, acrylic or plastic away layer by layer. They also do not produce clean interior surfaces so they won't work. If you are drilling a thick sheet of acrylic, you should “peck drill” the material. may chip the back side of the acrylic. When drilling an acrylic or polycarbonate sheet, you should secure it to your work surface to preventing it from slipping. When drilling acrylic, it is important that the sheet is well supported. Price Price. Chips that are molten and holes that show melting indicate that feed rate is too low or RPM is too high. The cutting edge must be ground “flat” to a 0-4° rake angle. Very glad we purchased this item. As indicated in the graphs and table above, lower SFM’s are required for larger drill bits. Specially designed bits are required. The holes range from 0.6mm to 3mm in 0.2 increments. Plexiglass, Lexan, Plastic Drill Bits These are the bits you need for drilling Plexiglass, Lexan polycarbonate, PETG, and other clear plastics. However, as mentioned above, if the tip angle is too large, larger than 90°, blow out and chipping may be a problem when the bit exits the acrylic. 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