How to Cut Acrylic and Drill Plexiglass Without Melting or Cracking It

Acrylic cuts and drills cleanly when you respect two facts about the material: it is brittle, so it chips and cracks if you force it, and it is a thermoplastic, so friction heat will soften and re-weld the cut behind your tool. Almost every bad result — a melted, gummy edge or a star-crack around a hole — traces back to one of those two. This guide covers the common methods, where each one works, and where it stops working.

Keep the masking film on

Leave the protective film on both faces while you cut and drill. It holds chips down, marks easily for layout lines, and protects the surface from scratches as the sheet slides across a table. Peel it only after the work is done.

Scoring and snapping (thin sheet)

For straight cuts in thin sheet — roughly 3/16″ and under — scoring and snapping is the simplest method and needs no power tools. Lay a straightedge along your line and draw an acrylic scoring tool (or the back of a utility knife) along it several times, pressing firmly, to cut a groove maybe a third of the way through. Then position the score directly over a table edge and press down sharply on the overhang. The sheet breaks along the groove.

The limits are real. Scoring only does straight lines, the snapped edge is rougher than a saw cut, and the method gets unreliable as the sheet gets thicker — above about 3/16″ the break wanders or the sheet refuses to snap cleanly. For thick stock, inside corners, or anything that has to look finished, move to a saw.

Table saw and circular saw

A table saw or circular saw gives the straightest, cleanest mechanical cut — if the blade is right. Use a fine-tooth carbide blade with a high tooth count; a blade ground for non-ferrous metal or laminate works well. The balance you are managing is melting versus chipping: too slow a feed and the blade dwells, friction heat builds, and the acrylic melts and re-fuses behind the cut; too fast or too coarse a blade and it chips the edge. Aim for a steady, moderate feed that keeps the chips clearing. Support the sheet flat and close to the blade so it cannot chatter or flex, and let the blade reach full speed before it meets the material.

Jigsaw (curves, with caveats)

A jigsaw is the tool people reach for to cut a curve or a cutout, and it can do that, but it is the easiest way to melt an edge. The blade is thin and slow, so it dwells and heats. Use a blade made for plastics or a fine metal-cutting blade, run a lower speed, keep the shoe flat, and do not push hard — let the blade work. Even done well, a jigsawed edge usually needs sanding and finishing afterward. For curves and cutouts that have to come out clean and repeatable, this is exactly the kind of work to send to a shop rather than fight by hand.

Drilling plexiglass

Drilling is where acrylic cracks if you treat it like wood. The problem is a standard twist bit: its sharp cutting edge grabs and digs as it punches through, splitting the sheet. Use one of two approaches:

• A specialized acrylic (spur-point) bit ground specifically for plastics, or
• A standard twist bit modified by dulling the leading edge slightly to a scraping rather than grabbing geometry.

Either way, put a backer board (scrap wood) directly under the sheet and clamp through into it, so the bit drills into wood as it exits instead of into open air. Run a low speed, ease off the pressure as you near breakthrough, and never punch throughthe last bit of material — that final shove is what cracks the hole. Clear chips and let the bit cool on thick stock rather than forcing one continuous plunge.

Countersinking

To seat a flat-head screw flush, countersink gently. Use a countersink bit at low speed and light pressure, checking the depth often — it is easy to go too deep, and a countersink concentrates stress, so over-cutting invites a crack. Take it in stages rather than one pass.

Safety

Wear eye protection for every cut and every hole — acrylic throws hard chips, and a cracked sheet can release a sharp shard. Control the swarf: cutting and drilling produce fine plastic chips that scatter and cling. Clamp your work so it cannot grab and spin, keep hands clear of the blade line, and work on a stable, supported surface.

Method at a glance

When buying it cut to size makes more sense

A clean straight cut needs a good blade and a reliable way to hold the sheet flat and steady. If you already own that setup and enjoy the work, cutting your own is fine. If you do not, the math usually favors having pieces cut to final size: a full sheet plus a fresh fine-tooth blade often costs more than the finished pieces would, before you have spent any time or risked a cracked panel. Our pieces are saw-cut to your dimensions and arrive at approximately ±1/16″ to ±1/8″, square and ready to use. For holes, notches, curves, or other shaped work that is hard to do well by hand, send the details and we will quote it.

Shop acrylic sheet cut to your size → · Request a quote for holes, notches, or curves · Sizes & tolerances