How to grind acrylic glass

Craftsmen and DIY enthusiasts appreciate acrylic glass equally because of its good processing capabilities. The grinding of acrylic glass also shows how diverse the plastic is. Following detailed information about professional grinding of acrylic glass.

Acrylic glass can be processed in many ways

Behind the complicated technical term "polymethylmethacrylate", PMMA for short, nothing else hides than acrylic glass. Acrylic glass can be edited in many ways. In addition to the standard machining techniques such as drilling, sawing or milling in particular the lasering of acrylic glass, acrylic glass molding or casting of acrylic glass should be emphasized.

Professional grinding of PMMA

Consequently, acrylic glass can also be ground without problems. Particularly noteworthy here is that the acrylic glass with the grinding can even be polished absolutely clear and transparent. For this purpose, the grinding of acrylic glass must be done in several steps:

  • Grind acrylic glass roughly (dry, grain size 80 to 100)
  • Grind acrylic glass medium (dry, up to 200 grit)
  • Finely sand acrylic glass (wet, grain size 400 to 600)
  • Polish acrylic glass

Possible preliminary work

Depending on the previous processing, it may also be advisable to deburr the acrylic glass on any burrs beforehand with a suitable scraper blade. Then the individual grinding steps are carried out.

The polishing of acrylic glass

In particular, during fine sanding and final polishing, you should hatch the acrylic glass surface to be treated with a non-water-soluble marker. This way, you can see at any time how the sanding pattern is created and whether you actually grind and polish evenly.

Machines for grinding PMMA

Acrylic glass does not necessarily have to be ground manually, that is by hand. You can also use conventional sanding machines for sanding. This includes:

  • sander
  • Deltaschleifer
  • Rotary and belt sander conditional

Rotary grinders

The problem with rotating and belt sanders is that the acrylic glass heats up very quickly. It can then no longer be sanded, as it adds the sandpaper used. In addition, no clear edges can be ground. It is therefore recommended to avoid these problems grinding machines in which the workpiece to be machined is not quite so hot.

Belt and rotary grinder conditionally suitable

However, since the grinding means friction energy, a certain amount of heat can not be completely excluded even with a sander. If you have never sanded acrylic, we recommend first sanding test pieces that are not needed. So you quickly get a feel for the acrylic glass. When wet grinding, it must be ensured that sanding residues are always well rinsed off the acrylic.

Polishes must be compatible with PMMA

As for polishes, almost every home improvement or craftsman recommends "his" very special product. Of course, it's always a question of how good someone is to deal with a specific product. For acrylic glass polishes, however, you must first and foremost make sure that the solvent contained in the acrylic glass, so do not dissolve.

Tips & Tricks

The grinding of PMMA is particularly in demand when, for example, scratches in the acrylic glass are to be removed. This works wonderfully, of course. However, material is also removed. You can avoid this by opening the guide to removing scratches made of acrylic glass. There we will introduce you to a technique that will completely remove scratches without weakening the material.

Video Board: Buffing acrylic back to a clear finish