I have a Porter-Cable 333VS random orbital sander. I works great with
a fresh disk, but the disks seem to wear out very quickly. I'm
currently using Sears Craftsman disks, but previously I've used other
brands and my first ones were PC.
Do others have this experience?
the bulk mirka's i have are great.
Mostly i find it depends on what you're sanding. Raw wood like oak, cherry,
walnut allows the discs to last a long time. Heavy resin woods like pine, gum
as do finished surfaces.
Yes. The experience changed with I changed to professional
quality disks. I'm using Klingspore and find they last about a dozen
times longer. Check the archives and you'll probable find other
That's a really good question. I thought about trying to define when
I posted the question and I wasn't sure enough to say how long. But,
if I had to make a guess . . .
Let's say a 100 grit disk at full speed on yellow pine will last about
10 minutes before it begins to take off so little material it's hardly
worth continuing. Of course it doesn't quit suddenly and I've never
tried to time it, so maybe that could be 5--20 minutes.
Maybe that's about 15-20 sq-ft of Baltic plywood.
All those are wild guesses.
well, if a disk lasted for 20 solid minutes at full speed (the only
speed I use, since I didn't get a VS PC sander) I'd consider that
normal. I buy 25 packs of ROS papers and replace worn pads often. I
don't even think about it, as the cost isn't that high... Now if I was
buying those little packages, I might get my shorts in a bunch if every
couple of minutes I burned through a bucks worth of paper...I'm just as
likely to tear a pad as wear it out, anyway, on some projects.
Ken Hall wrote:
: That's a really good question. I thought about trying to define when
: I posted the question and I wasn't sure enough to say how long. But,
: if I had to make a guess . . .
: Let's say a 100 grit disk at full speed on yellow pine will last about
: 10 minutes before it begins to take off so little material it's hardly
: worth continuing. Of course it doesn't quit suddenly and I've never
: tried to time it, so maybe that could be 5--20 minutes.
: Maybe that's about 15-20 sq-ft of Baltic plywood.
: All those are wild guesses.
The disc cost you 50 cents at the most, if bought in bulk. 20 sf of
sanding is petty good -- 2.5c a sf. Sandpaper is considered
an item you have to replace often --
-- Andy Barss
No. I have the Porter-Cable 333 and use Norton hook and
loop disks (buy them by the "contractor pack" of 25 at Home
Depot) and they haven't made me think they "wear out very
quickly." My experience is mostly with white oak and, no
matter the grit, I fill the collector (get lots of dust) and never
give "changing the disk" a thought.
Someone published a study a few years ago comparing sandpaper costs to
labor costs. I just looked and cannot find the study but maybe someone else
The study had a chart that showed how often you should change the
sandpaper based on the cost of sandpaper and the cost of labor. If you were
paying $10 per hour for labor and X for sandpaper, you should change the
paper every Y minutes.
The amazing part was that the study recopmmended changing the paper every
three to five minutes for most reasonable combinations of paper and labor
costs. The sanding efficiency of the paper dropped off quite quickly so it
made exonmical sense to change the paper early and often.
I hope that some can find the original study. It might have been done by
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