Author Topic: Which is most efficient?  (Read 2901 times)

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Offline Lbob131

  • Posts: 523
Which is most efficient?
« on: May 06, 2020, 05:45 PM »
The  Delta DTS 400  or  the Delta  pad  on the RO 90?
Have  a lot  of  windows   to sand  down.

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Offline rst

  • Posts: 2655
Re: Which is most efficient?
« Reply #1 on: May 06, 2020, 05:48 PM »
I use both but the advantage of the RO is that the pad can be rotated when the point is worn, but I love my DTSEC.

Offline Holzhacker

  • Posts: 1011
Re: Which is most efficient?
« Reply #2 on: May 06, 2020, 06:30 PM »
I have both sanders and have used both for windows. Just did two garage windows on saturday with the dts400. Overall though I prefer the RO90 for windows.
I would recommend thinking about it in terms of size and quantity. Lots of big windows to cover the 400. Fewer smaller windows that need to turn out great, the RO90.
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Offline Alanbach

  • Posts: 674
Re: Which is most efficient?
« Reply #3 on: May 06, 2020, 11:40 PM »
The DTS pad is considerably larger than the triangular pad on the RO 90 and the way that it is shaped and oriented it only has one point to get into corners with, when that it is worn out you need a new piece of sandpaper. It is orbital and has a 2mm stroke. The DTS is a great finish sander with or without the need to get into corners.

The RO90 triangular pad is smaller and it is an equilateral triangle so once a point is worn you can rotate the paper and have two more good points to work with. The RO90 is a random orbit sander finish sander as well as a rotary sander with a 3mm stroke so it’s capable of being a little more aggressive than the DTS. The RO 90 is a Rotex which means that is a versatile beast. It has gear mode which is great for tough jobs, is has random orbit mode which is great for finish sanding. It has the triangular head which is small and can get into more places than just about any other Festool sander and it can even be used as a polisher. For a Rotex it’s just their smallest offering which is not the greatest if you need to cover a lot of ground. Many consider the RO90 the most versatile of the Festool sanders.

I’m not a pro and don’t do windows so I own a DTS and a larger Rotex (125) but there are tons of pros here who swear by the RO90’s for window work as well as stair work.

Offline Alex

  • Posts: 7563
Re: Which is most efficient?
« Reply #4 on: May 07, 2020, 02:58 AM »
The DTS is a much more efficient all round sander and will do best with windows of all Festool sanders.

Offline leakyroof

  • Posts: 2344
Re: Which is most efficient?
« Reply #5 on: May 07, 2020, 10:40 AM »
what shape is the finish that's currently on the Windows?  Peeling/Alligator paint, or stained on the inside of the window and painted on the outside? Or, decent but faded paint?

 As noted, the Rotex mode of the RO 90 would be great for aggresive paint removal if Lead Paint is not an issue.
 Neither sander will get into fine detail , which would mean reaching for a small carbide scraper or similar tool.
 If the windows are weatheed and need alot of work, I'd reach for the Ro 90 in a heartbeat, esp. if epoxy work like from Abratron is needed.  If it's just a case of scuff sanding to prep for painting, and the pad of the DTS 400 fits where you need to go, I'd go with it since it's stable, small, light, and has great dust collection.
Not as many Sanders as PA Floor guy.....

Offline Lbob131

  • Posts: 523
Re: Which is most efficient?
« Reply #6 on: May 07, 2020, 06:03 PM »
The  windows  are  quite weathered  on the  outside. But in very good shape.
The  timber  is  pine.
Which served  its  first  life  for  at least  100 years  as  huge  floor  supporting  beams in  some  of  Belfast  cities  old    buildings  which were  demolished  in the eighties.
Coated  with a  thick layered  combination   of  stain  and  varnish.
I have  11  large casement  windows  in  total.
Removal  of the fanlight  and  2 casements  and  benched  in my  workshop  has  made  the job easier.
Have  the  outside  almost  completed  using a  Rotex  150. Quite  a lot of  flat sanding.
Using  up about  6 x  80  grit  discs  per  window  just  to get back  to  the  grain.

The  insides  will prove  more  challenging  as  so many  internal corners  to deal  with.
Think I'll go with  the RO90  and see  how  it performs.
As  it is  so adaptable.
Though I might  just  buy both.
Thanks  all.  [big grin]

« Last Edit: May 07, 2020, 06:29 PM by Lbob131 »

Offline ear3

  • Posts: 4204
Re: Which is most efficient?
« Reply #7 on: May 07, 2020, 10:50 PM »
Make sure to buy some spare triangle pads for the RO90.  Especially for an operation like that, which may require a fair amount of digging along the edges and corners, the velcro on those pads can burn out pretty quickly.  There are few things more frustrating than burning out your last pad in the middle of a job, and have to wait for a mail delivery or a future trip to the dealer to get more.
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Offline fuzzy logic

  • Posts: 386
Re: Which is most efficient?
« Reply #8 on: May 08, 2020, 03:41 AM »
If I’ve understood correctly, the Rotex 150 + about 6x 80 grit discs per window used for outside faces – just curious as to what abrasive was used? 

Do you have / use carbide scrapers at all?  Might be particularly useful on those pesky internal corners – used with care of course.
Where appropriate, I like using scrapers – then abrasives for final prepping.

(BTW: everyone, if possible, should have a Delta sander...  [scratch chin])

Richard (UK)
Decent people do the right thing - always?

Offline FestitaMakool

  • Posts: 1010
Re: Which is most efficient?
« Reply #9 on: May 08, 2020, 05:07 AM »
Since you are going ty buy the RO 90.. [wink]
This set might be handy, as they allow for working with variable distance to areas you don’t want to have the pad or paper bump into:

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Offline Lbob131

  • Posts: 523
Re: Which is most efficient?
« Reply #10 on: May 08, 2020, 01:53 PM »
I have a  set  of steel  scrapers  which have  proven very  useful.
Though  not  carbide.

My discs  are....

Offline Lbob131

  • Posts: 523
Re: Which is most efficient?
« Reply #11 on: January 31, 2021, 06:29 PM »
I purchased  both  sanders.
The  DTS  400   has  a  larger  sanding  pad   area  and    so for  sanding  larger  areas   is  faster   than  the  delta  mode  Ro90.

However  I have  found  out   that  the  RO90  is  in a league  of  its  own   when  it  comes  to   sanding  large  wooden  casement  windows.

Offline Crazyraceguy

  • Posts: 608
Re: Which is most efficient?
« Reply #12 on: February 02, 2021, 07:18 PM »
There are quite a few who have issues with the RO90, but I think they are fantastic. It was the first Festool sander I ever bought, simply because of the versatility it provides.
I use it on solid surface material on edges and smaller areas. I used it more often and more aggressively before I got the RAS115, but it still gets plenty.
The RAS can be extremely aggressive though, more like a grinder than a sander. I stepped up to the RO125 for more general use.
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