Random Orbital Sander
What is the difference between an orbital sander and random orbital sander? In order to understand this, you first need to understand what an orbital sander is. This type of tool moves sandpaper around in a continuous circle going in one direction. The pad where the sand paper is loaded is fixed in one position on the housing of the unit. The orbital part of the sander comes from the pad rotating the sandpaper around. The problem with orbital sanders is that if they are held in one position for too long, they can create grooves in the surface.
The random part of the tool name provides the difference. While the regular orbital tool rotates in one place, the random one does a bit more. The pad that the paper is fixed to not only rotates. It also moves around on a random plane. So instead of drawing circles in one direction at a fixed point, the sander will draw random circles over a wider area. This helps to prevent grooves from appearing on a surface.
For wood working, both sanders have a place. Random orbital sanders help to minimize or eliminate sander grooves from appearing. The flexible pad also allows for edges to be smoother and finer. This tool is also ideal for moving through large surfaces. With its speed and power, it can remove stain or paint rapidly on refinishing projects. Leveling boards is a breeze as well. The biggest drawback to random sanders is they cost a bit more to own and operate. Most cost at least $10 - $20 more than their regular counterparts. They also require special sand paper shapes for the circular pad. And because they do not get into tight spaces or corner, a regular sander is still required. And the regular sander is gentler when it comes to the finer grit sandpapers.
The biggest difference is what you are going to be using it for. As stated above, the random one is good for powering through paint removal and working on smoothing rough surfaces. The regular one is gentler and handles finish work better. And, as always, use the right tool for the job. You will be happier with the results.
– Professional Power Tool Guide
