Author Topic: Sanding/Finishing question grit/speeds  (Read 609 times)

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Offline Thompmd

  • Posts: 116
Sanding/Finishing question grit/speeds
« on: June 30, 2020, 10:33 AM »
Saw an article on Tutorwood from Brian who is a Festool Specialist from Melbourne.

He was referring to getting the most from a RO150.

Interesting article in regards to Rotex vs STD mode and as the grit went higher the speed went lower?? Being new I was wondering if this normal and if that’s what you did?

I tried today on Walnut Sewing Table and sanded from 60 at 6(speed) to 1200 at 1 following his recommendation . To be honest I had trouble seeing much if any difference.
Sawstop Industrial Saw, TS75,2 1400 rails, CT36, Rotex RO 150 FEQ, CT-VA-20, Carvex PS 420 EBQ, Carvex acc. ZH-SYS-PS 400, Kapex KS 120, CT Cyclone Dust Collection Pre-Separator CT VA 20, DF 500 Q Set, Domino 1,060pc Tenon Assortment, UG-KA-SET Portable Imperial Stand & Extensions,OF1400 EQ-F-Plus, MFT/3, MFT-SP, FS-HZ 160

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Offline Alex

  • Posts: 6573
Re: Sanding/Finishing question grit/speeds
« Reply #1 on: June 30, 2020, 11:34 AM »
I always leave the speed on its higest. Only VERY rarely do I turn it down, but only if I feel I absolutely have to because I might cause damage to the material. This happens certainly less than once per year for me.

To my feeling the speed of the sander is best left on full because the less power you give the sander the jerkier it will behave.

Offline ear3

  • Posts: 4051
Re: Sanding/Finishing question grit/speeds
« Reply #2 on: June 30, 2020, 12:33 PM »
I don't vary speed on sanding at higher grits.  I have no reason to doubt the recommendation, but I have never been dissatisfied with the results at full speed provided all the other precautions have been taken.  I do, however, switch over to the 150/3 from the 150/5 after 400 grit, as I've noticed the smaller sanding stroke gets better results more consistently.  Wiping away the dust from the previous grit, even when using a vac, also helps.

« Last Edit: June 30, 2020, 12:36 PM by ear3 »
Kapex KS 120 w/UG Cart and Extensions • CXS Set • T18+3 w/Centrotec Installer's Set • PDC 18/4 • TS 75 • TSC 55 • HKC 55 w/250, 420 and 670 FSK rails • Carvex 420 w/Accessory Kit • Domino 500 Set • Domino 700 XL • OF 2200 w/Base Accessory Kit • OF 1400 • OF 1010 • MFK 700 EQ Set • LR 32 • MFS 400 w/2000, 1000, and 700 extensions • Rotex 90 • Rotex 150 • LS 130 • ETS-EC 150/5 • ETS-EC 150/3 • Pro 5 LTD • RTS 400 • RAS 115.04 • RS 2 • HL 850 • Vecturo OS 400 • AGC 18-115 • CT 26 w/BT module • CT Sys w/Long-Life Bag • MFT/3

Offline Thompmd

  • Posts: 116
Re: Sanding/Finishing question grit/speeds
« Reply #3 on: June 30, 2020, 04:09 PM »
Learning opportunity for me! I never thought about the stroke difference from 3-5!

I’ve been sanding everything to 1200.

Sometimes on the back I will stop at 320/400, no reason other than lazy I guess.

Tell me more about the stroke difference and if it does make a difference(noticeably). I’m not opposed to a second sander but I would stay with the same 150 size to not duplicate paper.

Also, I use Granat paper for everything, I have some 24 saphir for rough slabs, it definitely removes material in Rotex mode but I spend the rest of the time removing scratches
Sawstop Industrial Saw, TS75,2 1400 rails, CT36, Rotex RO 150 FEQ, CT-VA-20, Carvex PS 420 EBQ, Carvex acc. ZH-SYS-PS 400, Kapex KS 120, CT Cyclone Dust Collection Pre-Separator CT VA 20, DF 500 Q Set, Domino 1,060pc Tenon Assortment, UG-KA-SET Portable Imperial Stand & Extensions,OF1400 EQ-F-Plus, MFT/3, MFT-SP, FS-HZ 160

Offline ear3

  • Posts: 4051
Re: Sanding/Finishing question grit/speeds
« Reply #4 on: July 01, 2020, 12:05 AM »
I wouldn't say the 3mm stroke sander is a necessity.  I mainly use it for when I'm sanding veneer, as it is much less likely to burn through thin material than the 5mm stroke sander, which can be quite aggressive.  But as mentioned, I also find it delivers more consistent results with high grit sanding.  Not that you can't get good results from the 5mm or Rotex, but every so often I have found some inconsistency or imperfections when working with the larger orbit sanders above 400, whereas the 3mm stroke sander always delivers.  So nowadays I just default to the 3mm sander when going into the high grits.

24 grit saphir is super aggressive to start at -- are you working with rough cut slabs?  For large flat surfaces I generally work initially with the RS2 to maintain a flat, even surface, then switch over to an ROS around 150 grit.  I would be worried about dishing the surface starting that low with the Rotex.
Kapex KS 120 w/UG Cart and Extensions • CXS Set • T18+3 w/Centrotec Installer's Set • PDC 18/4 • TS 75 • TSC 55 • HKC 55 w/250, 420 and 670 FSK rails • Carvex 420 w/Accessory Kit • Domino 500 Set • Domino 700 XL • OF 2200 w/Base Accessory Kit • OF 1400 • OF 1010 • MFK 700 EQ Set • LR 32 • MFS 400 w/2000, 1000, and 700 extensions • Rotex 90 • Rotex 150 • LS 130 • ETS-EC 150/5 • ETS-EC 150/3 • Pro 5 LTD • RTS 400 • RAS 115.04 • RS 2 • HL 850 • Vecturo OS 400 • AGC 18-115 • CT 26 w/BT module • CT Sys w/Long-Life Bag • MFT/3

Offline Thompmd

  • Posts: 116
Re: Sanding/Finishing question grit/speeds
« Reply #5 on: July 01, 2020, 07:46 AM »
Yes, I mostly work with kiln Dried 2-2 1/2” Live edge slabs, mostly Walnut but I recently used some rough 1 1/4” walnut  to make a couple things.  I’m also going to use the 1 1/4” to make some storage for the Festool Sys-AZ’s.

Tell me more about the RS2. I’m also definitely having trouble getting everything flat(can feel with my hand).

I currently only have a Dewalt 735x and the RO150 is my sander. Would my belt sander help keep things flat or do I need what I call an actual sander like a 22/44???

The slabs I get and resell are too big up to 50”w and 16’ long and I can’t justify the cost of equipment of that size.

Just a hobby guy making tables, benches, shelves , etc at this point
Sawstop Industrial Saw, TS75,2 1400 rails, CT36, Rotex RO 150 FEQ, CT-VA-20, Carvex PS 420 EBQ, Carvex acc. ZH-SYS-PS 400, Kapex KS 120, CT Cyclone Dust Collection Pre-Separator CT VA 20, DF 500 Q Set, Domino 1,060pc Tenon Assortment, UG-KA-SET Portable Imperial Stand & Extensions,OF1400 EQ-F-Plus, MFT/3, MFT-SP, FS-HZ 160

Offline ear3

  • Posts: 4051
Re: Sanding/Finishing question grit/speeds
« Reply #6 on: July 01, 2020, 09:42 AM »
Here's a good review thread on the RS2.  It's not as fast as the other sanders, but on large panel work, I have found the patience investment really pays off.  No more sinking feeling sighting down the length of a panel and noticing the waviness and dishing from those spots where you pressed in too hard to remove a scratch or a high spot.

When I work with rough slabs, generally my first step is to plane them with a router.  I now use the Woodpeckers slabbing mill to do this work, but you can get the same results by building your own router sled.  The Woodpeckers makes the process more efficient and repeatable, but it is unfortunately ridiculously expensive.  Once that is done, the RS2 starting at 60 or 80 grit will remove the router bit tracks while keeping the surface flat up until you're ready to move to the finishing grits with an ROS sander.

I've never used a belt sander for slab work, though I know some people do employ it in the initial stages for knocking down high spots.  I would imagine it would still be a challenge though to keep everything flat with a belt sander across the entire surface, given how aggressive it is.
Kapex KS 120 w/UG Cart and Extensions • CXS Set • T18+3 w/Centrotec Installer's Set • PDC 18/4 • TS 75 • TSC 55 • HKC 55 w/250, 420 and 670 FSK rails • Carvex 420 w/Accessory Kit • Domino 500 Set • Domino 700 XL • OF 2200 w/Base Accessory Kit • OF 1400 • OF 1010 • MFK 700 EQ Set • LR 32 • MFS 400 w/2000, 1000, and 700 extensions • Rotex 90 • Rotex 150 • LS 130 • ETS-EC 150/5 • ETS-EC 150/3 • Pro 5 LTD • RTS 400 • RAS 115.04 • RS 2 • HL 850 • Vecturo OS 400 • AGC 18-115 • CT 26 w/BT module • CT Sys w/Long-Life Bag • MFT/3

Offline Alanbach

  • Posts: 571
Re: Sanding/Finishing question grit/speeds
« Reply #7 on: July 01, 2020, 11:13 AM »
I have an RS2 and it is a great specialty sander! Unfortunately, it has just recently been discontinued and unlike the RAS it became hard to find almost immediately.

Offline Cheese

  • Posts: 7406
Re: Sanding/Finishing question grit/speeds
« Reply #8 on: July 01, 2020, 11:23 AM »

Interesting article in regards to Rotex vs STD mode and as the grit went higher the speed went lower?? Being new I was wondering if this normal and if that’s what you did?


I seldom ever change the speed of the sander. 90% of the time all of the Festool sanders are at max speed. The only exception to that is if there is a strange combination of grain pattern and sandpaper grit, then I'll fiddle with the speed to make the sander less jumpy.

Offline ear3

  • Posts: 4051
Re: Sanding/Finishing question grit/speeds
« Reply #9 on: July 01, 2020, 12:21 PM »
I had forgotten about that.  I've heard the Bosch OS50VC half sheet sander is fairly comparable to the Festool in terms of performance, though I have not used it myself.

I have an RS2 and it is a great specialty sander! Unfortunately, it has just recently been discontinued and unlike the RAS it became hard to find almost immediately.
Kapex KS 120 w/UG Cart and Extensions • CXS Set • T18+3 w/Centrotec Installer's Set • PDC 18/4 • TS 75 • TSC 55 • HKC 55 w/250, 420 and 670 FSK rails • Carvex 420 w/Accessory Kit • Domino 500 Set • Domino 700 XL • OF 2200 w/Base Accessory Kit • OF 1400 • OF 1010 • MFK 700 EQ Set • LR 32 • MFS 400 w/2000, 1000, and 700 extensions • Rotex 90 • Rotex 150 • LS 130 • ETS-EC 150/5 • ETS-EC 150/3 • Pro 5 LTD • RTS 400 • RAS 115.04 • RS 2 • HL 850 • Vecturo OS 400 • AGC 18-115 • CT 26 w/BT module • CT Sys w/Long-Life Bag • MFT/3

Offline rvieceli

  • Posts: 1206
Re: Sanding/Finishing question grit/speeds
« Reply #10 on: July 01, 2020, 01:14 PM »
If you are looking for a half sheet sander and can't find a Festool RS2, there are a couple of offerings you should take a look at. One of those is my favorite and suggestion.  [wink]

The Bosch that Edward mentioned is a contender but has a slight problem depending on your point of view. It gets very good reviews all around and is Bosch quality. The problem is that it only takes clamp on half sheet paper or stick on sandpaper. Doesn't do the hook and loop stuff. Actually comes with the punch to make the holes for dust collection. Runs around $300

https://www.amazon.com/Bosch-OS50VC-120-Volt-Finishing-Vibration/dp/B00B7EU1I4/ref=sr_1_1?dchild=1&keywords=Bosch+OS50VC&qid=1593623144&sr=8-1


This one is my favorite, the offering from Makita. BO4900V It is basically the same form factor. Is made in Japan and of good quality. The sander takes the normal clamp on half sheet paper BUT it will also take Festool paper intended for the RS2.. Hook and loop attachment and the exact same hole pattern. So you can use your favorite Festool paper. It usually runs around $175 or so although Amazon has a current price of $125 BUT not available until the first week in August. The only inconvenience with this sander is that the dust port is around 20-22mm so you need something to adapt the Festool hose to it.

https://www.amazon.com/Makita-BO4900V-Variable-Speed-Sander/dp/B0000789HT/ref=sr_1_1?dchild=1&keywords=Makita+bo4900v&qid=1593623614&sr=8-1

Ron