"Larry Jaques" <novalidaddress@di\/ersify.com> wrote in message
news:[email protected]...
> On Tue, 23 Nov 2004 19:21:09 GMT, "Mike Marlow"
> <[email protected]> calmly ranted:
>
> >
> >"Never Enough Money" <[email protected]> wrote in message
> >news:[email protected]...
> >> I got one as a birthday gift, a Porter-Cable.
> >>
> >> Seems my 3 gallon compressor ain't enough to keep it humming. I have
> >> to stop frequently to let the pressure rebuild. Just how a big a
> >> compressor is apprpriate?
> >
> >For most DA's you'll need at least 12SCFM.
>
> Y'know, if you guys would plane and scrape your wood, you wouldn't
> need so many sanders, and those you used would do the job on a much
> smaller air supply.
>
This is very true, but I do a lot of body work also and do you have any idea
how hard it is to run a Stanley #4 over a fender? Makes you and expert at
Scary Sharp technique...
--
-Mike-
[email protected]
"Never Enough Money" <[email protected]> wrote in message
news:[email protected]...
> I got one as a birthday gift, a Porter-Cable.
>
> Seems my 3 gallon compressor ain't enough to keep it humming. I have
> to stop frequently to let the pressure rebuild. Just how a big a
> compressor is apprpriate?
Porter Cable advertises 15 CFM needed to run their pneumatic DA sanders.
That said I run a DA sander off my Porter Cable air compressor often.
This model.
http://www.porter-cable.com/index.asp?e=547&p=4701
It almost keeps up! It runs steady when the sander is running, and the
pressure in the tank may drop to 80 PSI but no lower. Most of the time when
sanding you do not run steady for more than a few minutes so it gives the
compressor a chance to catch up.
If you are serious about sanding you will need a bigger unit, perhaps an
honest 5 HP.
Perhaps this one, but be prepared to spend close to $1000!!
http://www.porter-cable.com/index.asp?e=547&p=4702
Greg
"Mike Marlow" <[email protected]> wrote in message
news:[email protected]...
>
>>
> Are you running your DA in dual action mode Greg? I had a smaller
> compressor that would half operate a DA but it never delivered the air
> volume to properly rotate the thing. It would sand - sorta, but not
really.
> Not compared to what a DA should do. Hook it up to a decent air delivery
> and it's a whole different story.
> --
>
>
Yup! Works fine.
Greg
Holy moly!
"Knothead" <[email protected]> wrote in message news:<[email protected]>...
> Minimal 120 gallon 2 stage and that will likely run constantly trying to
> keep up
Larry Jaques <novalidaddress@di\/ersify.com> wrote in message
[snip]
>
> Y'know, if you guys would plane and scrape your wood, you wouldn't
> need so many sanders, and those you used would do the job on a much
> smaller air supply.
[snip]
Hmm. I use hand planes and then sometimes touch up with a fine grit
sanding (say 400). Also use sanding between finish coats. I assumed
hand planes wouldn't be good for a shellac surface...
Just out of curiosity, "How many legit HP does your compressor have
powering it?". I don't remember how many SCFM my two pumps are rated
at. I have two, two cylinder pumps (single stage) on a 3HP motor, 20
gal tank. Runs and ROS OK, cycles, smells a little warm after an hour
or so but doesn't get too hot to touch except the heads and air line to
the tank.
bob g.
Mike Marlow wrote:
> "Knothead" <[email protected]> wrote in message
> news:[email protected]...
>
>>Minimal 120 gallon 2 stage and that will likely run constantly trying to
>>keep up
>>
>>
>
>
> Not at all. I have a single stage with two massive cylinders and a 60 gal
> tank and it cycles in an acceptable manner running my DA. It's all about
> air volume. Mine delivers 18.7 SCFM at 100lbs and 16 SCFM at 145lbs.
> Plenty for a DA.
Eh? I have four cylinders, single stage, three HP. Not three HP
"developed" or whatever the advertising hype says but 3 HP on the motor
nameplate. Keeps up with sanders and everything I've tried except a big
sandblast gun. Tank is 20 gal. I takes it a long time to shut off
again but it gets there eventually, (running the sander).
bob g.
Never Enough Money wrote:
> I got one as a birthday gift, a Porter-Cable.
>
> Seems my 3 gallon compressor ain't enough to keep it humming. I have
> to stop frequently to let the pressure rebuild. Just how a big a
> compressor is apprpriate?
"Never Enough Money" <[email protected]> wrote in message
news:[email protected]...
> I got one as a birthday gift, a Porter-Cable.
>
> Seems my 3 gallon compressor ain't enough to keep it humming. I have
> to stop frequently to let the pressure rebuild. Just how a big a
> compressor is apprpriate?
For most DA's you'll need at least 12SCFM.
--
-Mike-
[email protected]
Never Enough Money wrote...
> I got one as a birthday gift, a Porter-Cable.
>
> Seems my 3 gallon compressor ain't enough to keep it humming. I have
> to stop frequently to let the pressure rebuild. Just how a big a
> compressor is apprpriate?
>
It's all about CFM. And duty cycle. Check the manual or www.porter-
cable.com for specs on your model, but continuous service for pneumatic
DA ROS's typically consumes 15CFM at 90psi.
My compressor sustains perhaps 11CFM at 90psi. It runs a Dynabrade ROS
slightly underpowered, but adequately for most work. If I have more than
a half hour of continuous sanding to do, I lower the regulator pressure
to 80 psi and set up an external fan to help cool the compressor. Under
those conditions, the compressor is on about 80% of the time. Not ideal,
but it does get the job done.
Jim
"Knothead" <[email protected]> wrote in message
news:[email protected]...
> Minimal 120 gallon 2 stage and that will likely run constantly trying to
> keep up
>
>
Not at all. I have a single stage with two massive cylinders and a 60 gal
tank and it cycles in an acceptable manner running my DA. It's all about
air volume. Mine delivers 18.7 SCFM at 100lbs and 16 SCFM at 145lbs.
Plenty for a DA.
--
-Mike-
[email protected]
"Robert Galloway" <[email protected]> wrote in message
news:[email protected]...
> Just out of curiosity, "How many legit HP does your compressor have
> powering it?". I don't remember how many SCFM my two pumps are rated
> at. I have two, two cylinder pumps (single stage) on a 3HP motor, 20
> gal tank. Runs and ROS OK, cycles, smells a little warm after an hour
> or so but doesn't get too hot to touch except the heads and air line to
> the tank.
>
> bob g.
Don't know for sure what the real HP is since I've never measured the
current flow. It's rated at 7HP max, so you can guess at what the real HP
is.
-Mike-
On Tue, 23 Nov 2004 19:21:09 GMT, "Mike Marlow"
<[email protected]> calmly ranted:
>
>"Never Enough Money" <[email protected]> wrote in message
>news:[email protected]...
>> I got one as a birthday gift, a Porter-Cable.
>>
>> Seems my 3 gallon compressor ain't enough to keep it humming. I have
>> to stop frequently to let the pressure rebuild. Just how a big a
>> compressor is apprpriate?
>
>For most DA's you'll need at least 12SCFM.
Y'know, if you guys would plane and scrape your wood, you wouldn't
need so many sanders, and those you used would do the job on a much
smaller air supply.
---
Is it time for your medication or mine?
http://diversify.com Custom Website Applications
"Greg O" <[email protected]> wrote in message
news:[email protected]...
>
> "Never Enough Money" <[email protected]> wrote in message
> news:[email protected]...
> > I got one as a birthday gift, a Porter-Cable.
> >
> > Seems my 3 gallon compressor ain't enough to keep it humming. I have
> > to stop frequently to let the pressure rebuild. Just how a big a
> > compressor is apprpriate?
>
> Porter Cable advertises 15 CFM needed to run their pneumatic DA sanders.
> That said I run a DA sander off my Porter Cable air compressor often.
> This model.
> http://www.porter-cable.com/index.asp?e=547&p=4701
> It almost keeps up! It runs steady when the sander is running, and the
> pressure in the tank may drop to 80 PSI but no lower. Most of the time
when
> sanding you do not run steady for more than a few minutes so it gives the
> compressor a chance to catch up.
> If you are serious about sanding you will need a bigger unit, perhaps an
> honest 5 HP.
> Perhaps this one, but be prepared to spend close to $1000!!
> http://www.porter-cable.com/index.asp?e=547&p=4702
> Greg
>
>
Are you running your DA in dual action mode Greg? I had a smaller
compressor that would half operate a DA but it never delivered the air
volume to properly rotate the thing. It would sand - sorta, but not really.
Not compared to what a DA should do. Hook it up to a decent air delivery
and it's a whole different story.
--
-Mike-
[email protected]