Pneumatic orbital and geared planetary sanders. What's the diff?

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Forum topic by gauntlet21 posted 07-12-2018 05:07 AM 924 views 0 times favorited 3 replies Add to Favorites Watch
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69 posts in 1096 days

07-12-2018 05:07 AM

Topic tags/keywords: sanding orbital geared pneumatic

I’m looking at purchasing a new sander to hook up to my air hose and have stumbled upon a few options that I’m not certain about. The main dilemma I currently am uncertain about is what a “geared planetary motion sander” is and how it differs from a non-geared random orbital sander. Besides the “planetary” and “random orbital” pattern, what does the gearing offer me in a pneumatic sander and is it worth an additional $75 (obviously, the specific use of the sander would determine that but just asking in general).


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#1 posted 07-12-2018 12:35 PM

ROS works by centrifugal force. During heavy material removal with coarse paper and much downforce the motion can almost be stopped, so material removal is slowed greatly. The geared disc will maintain the motion and material removal.

For finish sanding the geared type can remove too much material. Depends on whether you want a finish or rough sander, both can be used for either, but the design intent is different.

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#2 posted 07-12-2018 12:53 PM

What brand are you looking at?

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69 posts in 1096 days

#3 posted 07-26-2018 12:33 PM

I was looking at Dynabrade, 3M, Mirka, Aircat, etc. I’m also discovering after a little more close scanning that some of the sanders are strictly ORBITAL which I believe I do not want for finishing as it would leave swirl marks. So I think I am correct in stating that I should only be looking at dual action/random orbital sanders. This sander would be primarily for finish sanding on wood.

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