Michael Paul said:
Thank you for the questions. Grits depends on the need, condition of the piece and the goal/what is needed for the desired finish (60 to 1500). Working with hardwoods.
What I am seeking, why I will use the RO in orbital, is a more aggressive material removal (though not as aggressive as RO mode) with the 5mm stroke vs the 3mm stroke. That is why I will reach for the RO. So, just wondering if you notice a difference in the quality of sanding finish of the RO in orbital mode with its 5mm stroke vs the ETS with its 5mm stroke.
The reason I asked about grits is because with multiple sanders you'll likely find that you'd keep lower grits for the Rotex, and medium to fine for the ETS/EC, and wanted to see how fine you wanted to go. I haven't used all the Festool sanders so I can't give you a definitive answer. But, I do primarly hardwoods and go to very fine grits at times, so my use cases are probably very similar to yours.
My guess, FWIW, is that you won't notice anything but the slightest difference in the finish produced, and that slight difference wouldn't matter to me since for hardwoods I always do the final pass(es) as linear with the grain. For small projects that means a cork sanding block, for more sanding I use a Mirka vacuum sanding block, and if there are lots, I break out the LS130 with flat pad. All of those take 80mm wide sanding rolls (Cubitron II for me), that I cut to length, for grits up to 320. Anything beyond that is just the cork block.
I recently added the ETS/EC 150/5 to my sanding arsenal, which starts with a 25" wide dual drum sander (80 & 120 grits nominally, but sometimes 100 & 150) and a 3 decades old Bosch 1370DEVS 6" sander which is the Bosch equivalent of the Festool Rotex. The ETS/EC was a revelation compared to the Bosch in random orbit mode in every way - comfort, material removal (comparing random orbital modes), and quality of finish. I think some of the finish quality might be due to the better dust extraction holes on the Festool over the Bosch (I use a vacuum with both), but not sure.
What was really surprising is that I found the ETS/EC 150/5 to be
both more aggressive and producing a better finish than the Bosch in random orbit mode. My plan was/is to keep the Bosch in geared mode (rotex equivalent) and limit the grits I use to about 120 max, then switch to the ETS/EC for the medium sanding, and then finally the linear finish sanding as described above.
What I've found so far is that if the Bosch died, I wouldn't replace it with anything. Then again, it's probably not going to die because I'm not reaching for it, ever. I suppose if I had something too big for a stationary disk sander but not suitable for the large dual drum sander I'd pull out the Bosch, but I'm thinking I should sell it to gain back some space on a shelf.
With the Festool 30 day return option, why don't you try the ETS/EC 150/5 and see how it works for you?