If you’re a seasoned DIYer, you’ve likely used a random orbital sander.
What Is a Random Orbital Sander?
Jacob Fox
Types of Orbital Sanders
Not all orbital sanders are the same.
Credit:Jacob Fox
In fact, the random orbital sander operates completely differently than a standard orbital sander.
1/4-Sheet Orbital Sander
A 1/4-sheet orbital sander gets its name from its size.
The square pad is big enough to hold 1/4 of a 9x11 sandpaper sheet.
Additionally, a random orbital sander rotates while vibrating, while the 1/4- and 1/2-sheet orbital sanders simply vibrate.
This random, dual-motion helps to hide sanding marks.
Standard random orbital sanders have 5-inch pads with holes for dust collection.
The corresponding sanding pads are 5 inches wide with pre-cut holes that line up with the sander.
The lower the number, the coarser and more aggressive the sandpaper.
Use the guide below to get a basic understanding of how to understand sandpaper grit numbers.
60 and below:These grits are great forstripping old finishesor the beginning stages of smoothing extremely rough material.
180 to 220:Once you pass 180, the sandpaper is within the finishing range.
While these grits can also be used to strip finishes and smooth materials, they are much less efficient.
These grits are mostly utilized for prepping surfaces for paint or stain.
Start with your most aggressive grit.
For improved dust collection, use an adapter to install a wet/dry vac to the tool instead.
As you move the sander across the material, refrain from pressing down too firmly.
Instead, let the tool’s rotation and vibration do the work.
Failing to hold the sander evenly on the material will result in an uneven surface with gouges.
If you are ready to progress grits, choose the next grit with a higher number.
For most projects, aim to progress at least three grits.
If using a cordless sander, remove the battery while storing.
Replace the sanding pad as needed.
