6" vs 5" ROS

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Forum topic by moke posted 10-17-2016 05:21 PM 1134 views 1 time favorited 9 replies Add to Favorites Watch
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1421 posts in 3288 days

10-17-2016 05:21 PM

I recently read an article that 6” ROS are 40% more efficient than 5”. What is everybodies experience? I have 3 three 5” ROS, all Porter Cable, but now that I hear this the Bosch 6” is catching my eye….I hate sanding so if I could shorten the time, that appeals to me.
I searched for previous posts but could not find anything…..

-- Mike

9 replies so far

View Carloz's profile


1147 posts in 1103 days

#1 posted 10-17-2016 06:43 PM

From a theoretical point of view A 6” sander has 44% larger area than A 5” sander. But 5” sander has 30% smaller area than 6” sander.

square (5/6) = 0.7
square (6/5) = 1.44

So 6” sander is much faster than 5” sander but 5” is not much slower than 6” sander.

Go figure.

View DirtyMike's profile


637 posts in 1414 days

#2 posted 10-17-2016 06:53 PM

I have been wondering the same thing Mike, And that bosch does looks like a great value for money. I like to make big projects and I feel a 6 inch is in my future, but i will still keep my 5 inch.

View Kirk650's profile


672 posts in 1260 days

#3 posted 10-17-2016 07:51 PM

I don’t have a 6 inch ROS. I had planned to buy one, but the 5 inch ones (Ridgid, one each with 150, 220, and 320 grit) have worked so well I never did buy a 6 inch. I like the Ridgid ones because my shop vac hose plugs right into the dust outlet on the sander.


View Ken90712's profile


17744 posts in 3700 days

#4 posted 10-17-2016 10:03 PM

Totally worth it, I have 2 5’s and a lot of discs bought the 6 and cpl of the grits and love it.

-- Ken, "Everyday above ground is a good day!"

View moke's profile


1421 posts in 3288 days

#5 posted 10-18-2016 03:50 PM

Has anyone got the Rigid ROS 6”’s only 100.00….

-- Mike

View Carloz's profile


1147 posts in 1103 days

#6 posted 10-25-2016 05:53 PM

Not sure if automotive directly translates to woodworking but here is a video showing that 5” sander is actually faster than 6”.

View JackDuren's profile


388 posts in 1471 days

#7 posted 10-30-2016 02:29 AM

You’ll sand the same with a 6” as a 5”. You’ll make the same amount of passes as with a 5”. Only true gain is weight . A belt sander? Now that is different…..........

I’m often surprised when I hear that someone hates sanding. I find sanding to be enjoyable as it means that the hard work is over and the piece is one step from finishing.

View mandatory66's profile


202 posts in 2642 days

#8 posted 10-30-2016 05:10 AM

I have the Bosch 6” a Festool 5 inch and a Dewalt 5 inch. The Bosch is a gorilla compared to the others. I can hardly hold on to it in the aggressive mode. I use it on rough surface & paint removal. Tough tool.

View CopperTree's profile


53 posts in 1570 days

#9 posted 11-06-2016 06:34 AM

The new Festool Rotex sanders in 5” or 6” are truly unbelievable. I bought a Rotex RO 150 FEQ 6” with a Midi-vac and haven’t touched and of my other sanders since, not even my belt sanders. In Rotex mode with 40 grit they are as aggressive as any belt sander and with 2000 grit I can polish wood or Corian to a beautiful finish. Near perfect dust collection, easy to handle, and very powerful.

Your heart skips a beat or two at the till but I have no regrets. Cuts my sanding time down by 60%+ and makes is a pleasurable experience. I make a lot of end grain pieces and sanding can be a nightmare, now I look forward to it.

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