Hello All,
The only ROS I have used with any amount of time are the two Festools
I own; a 6 inch Rotex (about 3 years old ) and a 5 inch finish
sander. When using the Rotex as a ROS or the 5 inch I notice that the
pad spins rapidly when minimal downward pressure is applied. If I
bear down on it the pad will slowly rotate, much like a second hand on
a clock. Which is the best way to use these machines? Am I risking
sander failure if I push too hard? Am I causing whirling if I let it
rest by gravity alone? Also, what vaccum setting do you use? Do you
vary the suction depending on the grit being used or do you keep it
constant?
I do notice whirling with the Rotex (6mm oscillation, I think) when
sanding with 180 grit and larger but I can make that disappear with
finer grit or by going to the 5 inch finsih sander (2mm oscillation).
Any comments or criticisms are welcome.
Marc (taking a break from sanding a 84 x42 Cherry door;
6 inch stiles, 51/2 inch rails - top, bottom and middle, all 8/4.
4/4 T&G boards as filler, 6 across. It's a sliding door for my
neighbor's wine cellar.)

On Jun 22, 11:21*am, marc rosen wrote:
Hello All,
The only ROS I have used with any amount of time are the two Festools
I own; a 6 inch Rotex (about 3 years old ) and a 5 inch finish
sander. *When using the Rotex as a ROS or the 5 inch I notice that the
pad spins rapidly when minimal downward pressure is applied. *If I
bear down on it the pad will slowly rotate, much like a second hand on
a clock. *Which is the best way to use these machines? *Am I risking
sander failure if I push too hard? *Am I causing whirling if I let it
rest by gravity alone? *Also, what vaccum setting do you use? *Do you
vary the suction depending on the grit being used or do you keep it
constant?
I do notice whirling with the Rotex (6mm oscillation, I think) when
sanding with 180 grit and larger but I can make that disappear with
finer grit or by going to the 5 inch finsih sander (2mm oscillation).
Any comments or criticisms are welcome.
* * * * * * * *Marc (taking a break from sanding a 84 x42 Cherry door;
6 inch stiles, 51/2 *inch rails - top, bottom and middle, all 8/4.
4/4 T&G boards as filler, 6 across. *It's a sliding door for my
neighbor's wine cellar.)

Are you using the 'aggressive' setting? That setting on the Rotex WILL
rotate. The 'fine' setting shouldn't rotate too much.
Speed at # 5 is best for wood, I find.
The vacuum setting on max. always.... and blow off the work between
grit changes.

On raw cherry, I'd start with 180 on 'aggressive' if it comes out of
the planer reasonably clean.
If the planer leaves a lot of 'ladders', I'd hit it with a 120 grit
belt first. (and quickly, no loitering)

Then, after 180 on 'agg', I'd flip over to 180 on 'fine' then 240 on
'fine'. 320 is optional, but seldom required.

Hey, that's just me. I seldom use a finish sander anymore. Only if I
need to get into a corner.

r

The only correction , and a small one is to reduce vac to about 1/2 speed
when using grits over 320, per manufacturer, this reduces the aggressiveness
of the paper causing a better sanding job. For general sanding raw wood or
a painted surface, wide open.

Ken



"Robatoy" wrote in message
...
On Jun 22, 11:21 am, marc rosen wrote:
Hello All,
The only ROS I have used with any amount of time are the two Festools
I own; a 6 inch Rotex (about 3 years old ) and a 5 inch finish
sander. When using the Rotex as a ROS or the 5 inch I notice that the
pad spins rapidly when minimal downward pressure is applied. If I
bear down on it the pad will slowly rotate, much like a second hand on
a clock. Which is the best way to use these machines? Am I risking
sander failure if I push too hard? Am I causing whirling if I let it
rest by gravity alone? Also, what vaccum setting do you use? Do you
vary the suction depending on the grit being used or do you keep it
constant?
I do notice whirling with the Rotex (6mm oscillation, I think) when
sanding with 180 grit and larger but I can make that disappear with
finer grit or by going to the 5 inch finsih sander (2mm oscillation).
Any comments or criticisms are welcome.
Marc (taking a break from sanding a 84 x42 Cherry door;
6 inch stiles, 51/2 inch rails - top, bottom and middle, all 8/4.
4/4 T&G boards as filler, 6 across. It's a sliding door for my
neighbor's wine cellar.)

Are you using the 'aggressive' setting? That setting on the Rotex WILL
rotate. The 'fine' setting shouldn't rotate too much.
Speed at # 5 is best for wood, I find.
The vacuum setting on max. always.... and blow off the work between
grit changes.

On raw cherry, I'd start with 180 on 'aggressive' if it comes out of
the planer reasonably clean.
If the planer leaves a lot of 'ladders', I'd hit it with a 120 grit
belt first. (and quickly, no loitering)

Then, after 180 on 'agg', I'd flip over to 180 on 'fine' then 240 on
'fine'. 320 is optional, but seldom required.

Hey, that's just me. I seldom use a finish sander anymore. Only if I
need to get into a corner.

r

"marc rosen" wrote in message
...
Hello All,
The only ROS I have used with any amount of time are the two Festools
I own; a 6 inch Rotex (about 3 years old ) and a 5 inch finish
sander. When using the Rotex as a ROS or the 5 inch I notice that the
pad spins rapidly when minimal downward pressure is applied. If I
bear down on it the pad will slowly rotate, much like a second hand on
a clock. Which is the best way to use these machines? Am I risking
sander failure if I push too hard?

Why do you want to push hard? We buy power tools to make work easier and it
is designed to work with light pressure.

On Jun 22, 2:11*pm, "Edwin Pawlowski" wrote:
"marc rosen" wrote in message

...

Hello All,
The only ROS I have used with any amount of time are the two Festools
I own; a 6 inch Rotex (about 3 years old ) and a 5 inch finish
sander. *When using the Rotex as a ROS or the 5 inch I notice that the
pad spins rapidly when minimal downward pressure is applied. *If I
bear down on it the pad will slowly rotate, much like a second hand on
a clock. *Which is the best way to use these machines? *Am I risking
sander failure if I push too hard?

Why do you want to push hard? *We buy power tools to make work easier and it
is designed to work with light pressure.

Hello Edwin,
It's not that I want to push hard, but I notice the pad behaves
differently when there is minimal pressure vs. pushing down on it.
There is more circular motion with little or no pressure and I'm
wondering if this is the way the sander should be used. I thought
that more circular motion would leave swirls and strictly oscillating
would make a better finish.

And to Robatoy, my Rotex does not have a fine or aggressive setting,
but it does select between rotating or oscillating. Is this what you
are referring to or does your- later model, I presume - Rotex have
those featured settings?

Anyway, the door is sanded and my lovely wife applied the wipe on
poly. Soon it will be assembly time. Read you all later,
Marc

"marc rosen" wrote in message
...
Hello All,
The only ROS I have used with any amount of time are the two Festools
I own; a 6 inch Rotex (about 3 years old ) and a 5 inch finish
sander. When using the Rotex as a ROS or the 5 inch I notice that the
pad spins rapidly when minimal downward pressure is applied. If I
bear down on it the pad will slowly rotate, much like a second hand on
a clock. Which is the best way to use these machines? Am I risking
sander failure if I push too hard? Am I causing whirling if I let it
rest by gravity alone? Also, what vaccum setting do you use? Do you
vary the suction depending on the grit being used or do you keep it
constant?
I do notice whirling with the Rotex (6mm oscillation, I think) when
sanding with 180 grit and larger but I can make that disappear with
finer grit or by going to the 5 inch finsih sander (2mm oscillation).
Any comments or criticisms are welcome.
Marc (taking a break from sanding a 84 x42 Cherry door;
6 inch stiles, 51/2 inch rails - top, bottom and middle, all 8/4.
4/4 T&G boards as filler, 6 across. It's a sliding door for my
neighbor's wine cellar.)

I have the Rotex and the Festool Finish sander. Both took some getting use
to. With the Rotex in the less aggressive RO setting I dial down the vac so
that it will float more easily same goes for the Finish sander. I found
that with the vac dialed up that the sanders felt sluggish. I do back
enough that it gets all the dust but dies not restrict movement. I do not
press down harder with either sander other than enough to keep them up right
and flat.

"marc rosen" wrote in message

Hello Edwin,
It's not that I want to push hard, but I notice the pad behaves
differently when there is minimal pressure vs. pushing down on it.
There is more circular motion with little or no pressure and I'm
wondering if this is the way the sander should be used. I thought
that more circular motion would leave swirls and strictly oscillating
would make a better finish.

**************************************

Pushing hard is more likely to gauge the wood rather than sand it to a nice
finish. Use enough pressure to guide it, not force it.