How to Cut, Drill, Finish, and Glue Acrylic

 

Jan
25

9


How-to-Cut-Drill-Finish-and-Glue-AcrylicWorking with acrylic is easy if you understand its properties and follow industry guidelines on how to handle it properly.  Using the correct tools is also important.  This article offers some practical tips on working with acrylic that will help you get started on your next project.

What is Acrylic?

Acrylic is a clear plastic that closely resembles glass but has many advantages, making it in excellent substitute in many applications.  Compared to glass, acrylic is:

  • Lighter in weight by half
  • Stronger and more impact resistant
  • Offers better insulating properties
  • More transparent

Acrylic does have two main disadvantages compared to glass:  it’s more expensive and it can melt and burn if exposed to a direct flame.  Because it doesn’t transfer heat well, special care needs to be taken when working with acrylic to avoid creating heat, which may cause stress that can lead to crazing.

How to Cut Acrylic

Acrylic comes with a protective masking on both sides.  Keep the masking on for as long as possible throughout the fabrication process to protect the finish.

There are several ways to cut acrylic, but regardless of which method you use, you will want to prevent your cutting tools from becoming a source of damaging heat.  One method is to use a table saw, preferably with a carbide-type blade with 10 teeth per inch.  Acrylic can also be cut with a CNR router, a CO2 laser or a water jet.  Note that each cutting method will create a different edge finish.

Choose a saw blade that is designed for cutting acrylic.  The blade’s teeth should be fine, of the same height, evenly spaced, with little or no set.  Be sure to feed the acrylic into the saw blade at a steady rate — feeding it too fast or too slow can cause the edge of the material to melt.

Thin pieces of acrylic (1/8″ or less in thickness) can be scored like glass using a scribing knife, metal scriber, awl or utility knife, and snapped apart. Note that this process does not work well for long cuts and may not leave an edge that is flat enough for capillary gluing.

How to Drill Acrylic

Acrylic can be drilled successfully but there are two situations you need to avoid: creating heat and twisting the material.  Heat generated by a drill can cause the acrylic to melt or crack, and any twisting or grabbing by the drill bit can cause the material to fracture.

A normal twist drill can be modified for use on acrylic with a bench grinder.  Use specially-ground and polished drill bits that are designed for use with acrylic.  You can modify the bit by grinding small flats onto both cutting edges, so the bit cuts with a scraping action. If the drill is correctly sharpened and operated at the correct speed, a long curly strand of acrylic will be created during the drilling process.

Drill speed is an important factor.  Set the drill press from 500 to1000 RPM.  Always begin and end the drilling of holes at a slow-feed rate.  If you are drilling a series of holes, allow the bit to cool off from time to time to avoid heating the acrylic.

A piece of plywood can be placed behind the acrylic to give the exiting drill bit something to dig into and prevent it from grabbing the acrylic as the drill speed winds down.  To prevent cracking the edge of the acrylic sheet, do not drill too close to the edge (1.5 times the diameter of the hole measured from the center would be considered “too close”).

How to Finish Acrylic Edges

Several factors will determine how well you need to finish the edges of your acrylic pieces:  how the project is going to be used, if the joints will be glued, the type of glue you plan to use, and the type of joint desired.  During the early planning stages of your project, remember that choosing the right saw blade for your initial cuts can greatly minimize the amount of edge finishing needed down the road.

There are several methods for finishing the edges of a piece of acrylic.  For details, go to “Finishing Acrylite Acrylic Sheets.”

How to Glue Acrylic

Solvent cements are recommended to create strong, transparent and durable joints on acrylic pieces.  When using solvent cements, always work in a well-ventilated area away from heat or flames.  Wear protective goggles and clothing and follow the manufacturer’s instructions.

Capillary cementing is the most popular method for joining acrylic. To create perfect joints, make sure that all surfaces that will be joined together fit without force and are flat, straight and clean.  Hold the pieces together using masking tape or a clamp and keep the joint in a horizontal plane so the cement doesn’t run out.

Apply the cement carefully along the entire joint. For box-corner joints, apply the cement from the inside edge.  On flat joints, apply the cement on both sides if possible.

For best results, use a needle-nosed applicator bottle. Allow the joint to set for about 30 minutes before moving the joined pieces.  Note that maximum bond strength takes 24 to 48 hours.

For more information, read our article titled “Glues for Plastic: How to Choose the Right Adhesive.

Acrylic Has Many Uses…Including Your Next Project!

Acrylic can be purchased in sheets, tubes or rods of varying thicknesses and is a popular material for windows, aquariums, shower doors, skylights, picture frames and more.  Some brands of acrylic, such as Acrylite and Lucite, come in different colors, textures and performance grades.  Once you understand the guidelines of working with acrylic, the possibilities of what you can make with it are endless.

Tell Us

What have you made with acrylic, or what would you like to make? If you have questions, just let us know in the comments. We’re here to help!

 

9 Responses to “How to Cut, Drill, Finish, and Glue Acrylic”

  • Emmett Simmons says:

    February 1, 2012 at 10:36 pm

    I have a piece of lucite 30 inches tall and 10 inches square. It is finished on 2 sides. the top and bottom are rough on the top, bottom and the other 2 sides. It has an image in side of it and I would like to have it clear on all 6 sides. Can you tell me what tools I need to make it flat and how to make it clear. Thank you, Emmett



      Pam Aungst says:

      February 1, 2012 at 11:12 pm

      Hi, Emmett!

      That’s quite a big casting you’ve got there! Here’s some advice from our manufacturing division:

      In order to buff the block you will need to give the side a nice sanding to make sure all tool marks are gone and the finish is a uniform. 100 grit and an orbital hand sander should work fine. At this point you will need to apply polishing compound to a buffing wheel and buff out the side with “rouge” compound first. Then a white finishing compound follows the “rouge” and gives the edge a high luster. Practice on a scrap piece before tackling anything as heavy as 10″.

      Thanks for stopping by our blog! Let us know if we can help further.



  • STU ANDERSON says:

    February 20, 2012 at 3:35 pm

    I am replacing a clear acrylic hatch on a sailboat. The hatch is not flat but is curved to match the contour of the deck. What is the best way to support this when drilling? Is a step drill a good choice as a drilling tool? All the holes are to be drilled for a #12 screw for 2 hinges and 2 latches.

    Thanks



      Pam Aungst says:

      February 23, 2012 at 7:28 am

      Hi Stu! Good question. I’ve submitted it to our manufacturing department for feedback. We’ll get back to you shortly.



      Pam Aungst says:

      February 23, 2012 at 9:01 pm

      Hi Stu,

      This is what our manufacturing department advises:

      “Put a piece of plywood or MDF under the hatch prior to drilling. If you can clamp the MDF to the plastic hatch, that is even better. Use a drill bit specifically ground for plastics (we sell the proper bits at all of our branches). You might want to do a pilot hole prior to the finished hole.”

      I hope that helps! Let us know if you have further questions.



    keith parke says:

    August 16, 2012 at 3:34 pm

    The shower in my caravan is lined with one piece acrylic sheet wrapped “U” shaped on 3 sides with the door at the front. The acrylic has a crack aprox. 250mm long horizontaly at mid height in the middle of one side. Could this crack be repaired, as it will be subject to movement stress during journeys. I have removed the liner and am able to get at both sides.
    thank you
    keith



      Pam Aungst says:

      August 23, 2012 at 3:18 pm

      Hi Keith,

      The recommendaion from our team is to replace it.

      Please let us know if we can assist you further.



    Sandra Melin says:

    September 3, 2013 at 9:37 pm

    I want to cut 2 1/2″ inches off the legs of an acrylic chair. What would be the best way to do this? Thank you, Sandy



      Administrator says:

      September 6, 2013 at 10:54 am

      Hello Sandra, Thanks for the question and sorry for the late response, first of all I would not recommend shortening the legs of an acrylic chair as some of them might lose their structural stability, but if you still want to cut the legs I would suggest a Carbide-Tipped Circular Saw.

      Good Luck
      David Thal



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