All Replies on What size of "Orbit" should I buy on an Air sander?

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View PPK's profile

What size of "Orbit" should I buy on an Air sander?

by PPK
posted 02-23-2017 06:55 PM

6 replies so far

View Loren's profile


10477 posts in 4248 days

#1 posted 02-23-2017 07:14 PM

I think smaller orbital patterns are used more
for finishing finishes, varnished table tops
for example.

I think a larger orbit is more useful for aggressive
removal of wood.

I only have one ROS I use for everything and when
I sand finishes I usually do it by hand.

Sanding and finishing are certainly not strong
skills for me though. If you really want to improve
in those areas to save time, there’s a lot to learn.

View 000's profile


2859 posts in 1500 days

#2 posted 02-23-2017 07:39 PM

I have the Mirka 5” with a 3/16 orbit.
I like it a lot.
I still can put 80g on it and it’s aggressive enough when you need it,
I mostly use it for 150 and 220.
On occasion I will use 320 on primmer/undercoating before top coating.

View cabmaker's profile


1745 posts in 3409 days

#3 posted 02-23-2017 10:21 PM

If those are your options go for the 3/32

If your doing cabinet work and some furniture you will never need the 3/8

View Tony_S's profile


1062 posts in 3683 days

#4 posted 02-24-2017 10:53 AM

3/16 is the best middle ground imo.

I can’t speak for the Mirka personally, but I’ve never heard or read anything but good about them.
I’ve got 7 or 8 Dynabrade’s in the shop ranging anywhere from 2 to maybe 15 years old….they are bullet proof.
As you’ve said, good dry air(critical for any air tool) is key….and as many times as I’ve bitched at the guys in the shop to oil them regularly, I’d truly be surprised if any of them see oil more than once a month.
Other than regular pad replacement which is normal for any brand, and replacing a couple of springs and o rings on some of the older ones, never had a single issue with any of them.

-- “Wise men speak because they have something to say; fools because they have to say something.” – Plato

View PPK's profile


1629 posts in 1410 days

#5 posted 03-03-2017 05:16 PM

I went with the Dynabrade 5” Spirit model, in the 3/16” orbit. Tried some 3M ceramic (purple) disks on it last night, and it worked great. Sure is quiet. Looking forward to sanding a little more now… ;-)

-- Pete

View GR8HUNTER's profile


6797 posts in 1313 days

#6 posted 03-03-2017 06:26 PM

3/32 WOULD work great on stained doors …and the other would work well with painted doors ….Dynabrade is a fabulous sander …. GOOD LUCK :<))

-- Tony---- Reinholds,Pa.------ REMEMBER TO ALWAYS HAVE FUN

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