hi:
I am planning to run the dust collector duct work for a future table saw
under a concrete slab. Just dig a trench, place (sealed) duct work and
fill over with sand? I suspect the sand fill is tantamount to a liquid
over the long term so if the ductwork doesn't crush in say 24 inches of
water, it won't crush in a few inches of sand under a slab. Is my thinking
correct here? Or are there any gottchas? Ductwork is 6 inch diameter 30
gage.
Thanks
Jonathan
"Jonathan Mau" <[email protected]> wrote in message
news:[email protected]...
> hi:
>
> I am planning to run the dust collector duct work for a future table saw
> under a concrete slab.
This is one place that PVC pipe is the way to go. I would not put metal
underground.
Just be sure you ground the PVC to protect from the possibility of an
explosion! (running, ducking!) ;-)
Greg
"Edwin Pawlowski" <[email protected]> wrote in message
news:[email protected]...
>
> "Greg O" <[email protected]> wrote in message
>
> > Just be sure you ground the PVC to protect from the possibility of an
> > explosion! (running, ducking!) ;-)
> > Greg
>
> But if it is buried, isn't it automatically grounded?
>
>
Not good enough, you need to wrap the pipe with wire and connect it to a
grounding rod, that is, of course, driven into the ground!
Greg
>Jonathan wrote:
>I am planning to run the dust collector duct work for a future table saw
>under a concrete slab. Just dig a trench, place (sealed) duct work and
>fill over with sand? I suspect the sand fill is tantamount to a liquid
>over the long term so if the ductwork doesn't crush in say 24 inches of
>water, it won't crush in a few inches of sand under a slab. Is my thinking
>correct here? Or are there any gottchas? Ductwork is 6 inch diameter 30
>gage.
>
Is 30 gauge going to be able to handle the vacuum pressure? Tom
Work at your leisure!
I did this in my shop, but using 4 inch sched 40 PVC. I'd worry less
about it than underfloor sheet metal in terms of collapse or
corrosion. There could be condensation in the pipe under the right
conditions.
Run PVC electrical conduit and maybe compressed air, too.
Also is wisest to run the pipe, then pour the slab, rather than the
other way 'round. DAMHIKT
Jonathan Mau <[email protected]> wrote in message news:<[email protected]>...
> hi:
>
> I am planning to run the dust collector duct work for a future table saw
> under a concrete slab. Just dig a trench, place (sealed) duct work and
> fill over with sand? I suspect the sand fill is tantamount to a liquid
> over the long term so if the ductwork doesn't crush in say 24 inches of
> water, it won't crush in a few inches of sand under a slab. Is my thinking
> correct here? Or are there any gottchas? Ductwork is 6 inch diameter 30
> gage.
>
> Thanks
>
> Jonathan
Jonathan,
I would suggest using 4" ABS, glued for the underground part of the run.
Moisture will get in otherwise. The 4" ABS will allow you to clean it
periodically. I would not put other machines on the underground section. I
would also run electrical conduit futures in as well.
Dave
"Jonathan Mau" <[email protected]> wrote in message
news:[email protected]
> hi:
>
> I am planning to run the dust collector duct work for a future table saw
> under a concrete slab. Just dig a trench, place (sealed) duct work and
> fill over with sand? I suspect the sand fill is tantamount to a liquid
> over the long term so if the ductwork doesn't crush in say 24 inches of
> water, it won't crush in a few inches of sand under a slab. Is my
thinking
> correct here? Or are there any gottchas? Ductwork is 6 inch diameter 30
> gage.
>
> Thanks
>
> Jonathan
>I would suggest using 4" ABS, glued for the underground part of the run.
>Moisture will get in otherwise. The 4" ABS will allow you to clean it
>periodically. I would not put other machines on the underground section.
Under no circumstance should you use 4" piping for anythin relating to dust
collection, until you make the machine connection, and that should be changed
as well.
Also, 30 ga ductwork will work for a laundry exhause, and some light AC work,
but under no circumstances should this be done for dust collection.
When you bury ductwork, you are alsays best off using an access panel for when
it clogs or changes. 26 ga. for straight runs alone is the minimum. You use 30,
and the collector will collapse it inside the sand.
ABS is a mass produced, fairly expensive form of ductwork that people like Jet
sells for systems to pick up shavings, but not dust.
Why not? I have installed it in a professional cabinet shop 10+ years ago.
I was for a Unisaw and a 12" jointer. A blast gate separates the different
machines. The system, both below the slab and above have been flawless.
You made a rash statement with no explanation, reason or offer even an
opinion on the OP question. Why is that?
Dave
"DarylRos" <[email protected]> wrote in message
news:[email protected]...
> >I would suggest using 4" ABS, glued for the underground part of the run.
> >Moisture will get in otherwise. The 4" ABS will allow you to clean it
> >periodically. I would not put other machines on the underground section.
>
> Under no circumstance should you use 4" piping for anythin relating to
dust
> collection, until you make the machine connection, and that should be
changed
> as well.
>
> Also, 30 ga ductwork will work for a laundry exhause, and some light AC
work,
> but under no circumstances should this be done for dust collection.
>
> When you bury ductwork, you are alsays best off using an access panel for
when
> it clogs or changes. 26 ga. for straight runs alone is the minimum. You
use 30,
> and the collector will collapse it inside the sand.
>
> ABS is a mass produced, fairly expensive form of ductwork that people like
Jet
> sells for systems to pick up shavings, but not dust.
>You made a rash statement with no explanation, reason or offer even an
>opinion on the OP question. Why is that?
It wasn't rash. 4" ABS is awful for dust collection. Note I did say that its
fine for shavings. And simply saying you've used it in professional shops for
years merely means that woodworkign professionals are not experts in dust
collection. Few are.
You might want to check out Bill Pentz's now legendary website regarding dust
collection.
Again, comments without suggestions.
Here is a quote from Bill Pentz's now legendary website :
"Strangely, when it comes to ducting, other than getting a professionally
designed and built system using expensive smooth walled metal laser welded
pipe, the low cost S&D PVC pipe (see my PVC site if you want to do "magic"
with fitting PVC into your ducting.) is generally one of the best choices
because it is smooth, far stronger than most HVAC metal pipe or spiral pipe,
costs less, and fittings are a fraction of the price. Next best are the HVAC
metal ducts. "
Dave
"DarylRos" <[email protected]> wrote in message
news:[email protected]...
> >You made a rash statement with no explanation, reason or offer even an
> >opinion on the OP question. Why is that?
>
> It wasn't rash. 4" ABS is awful for dust collection. Note I did say that
its
> fine for shavings. And simply saying you've used it in professional shops
for
> years merely means that woodworkign professionals are not experts in dust
> collection. Few are.
>
> You might want to check out Bill Pentz's now legendary website regarding
dust
> collection.
In article <[email protected]>,
[email protected] (DarylRos) wrote:
> >You made a rash statement with no explanation, reason or offer even an
> >opinion on the OP question. Why is that?
>
> It wasn't rash. 4" ABS is awful for dust collection. Note I did say that its
> fine for shavings. And simply saying you've used it in professional shops for
> years merely means that woodworkign professionals are not experts in dust
> collection. Few are.
>
> You might want to check out Bill Pentz's now legendary website regarding dust
> collection.
I'm not sure what you might be an expert in, if anything, but it sure
ain't posting in a newsgroup.
Don't you suppose that after touting a "legendary website regarding dust
collection", you might want to provide a link to such a font of esoteric
knowledge?
By the way, you don't mind if I adopt that for my own, do you? I'm a
horrible name dropper and I'm just dying for the opportunity to throw
out my intimate knowledge of "Bill Pentz's now legendary website
regarding dust collection." That'll turn some heads.
--
-JR
Hung like Einstein and smart as a horse
Remove NO SPAM from e-mai address to reply
In article <[email protected]>, [email protected] wrote:
>hi:
>
>I am planning to run the dust collector duct work for a future table saw
>under a concrete slab.
How do you propose gaining access to the duct to remove a clog?
--
Regards,
Doug Miller (alphageek-at-milmac-dot-com)
Get a copy of my NEW AND IMPROVED TrollFilter for NewsProxy/Nfilter
by sending email to autoresponder at filterinfo-at-milmac-dot-com
You must use your REAL email address to get a response.
Is this slab poured yet? If not, why not build a concrete form to form
your trench, then use some sheet steel to cover the trench. If you
incorporate a lip in your form, then the sheet steel can be laid flush to
the floor and you don't have to worry about future access issues.
Joe
"Jonathan Mau" <[email protected]> wrote in message
news:[email protected]...
> hi:
>
> I am planning to run the dust collector duct work for a future table saw
> under a concrete slab. Just dig a trench, place (sealed) duct work and
> fill over with sand? I suspect the sand fill is tantamount to a liquid
> over the long term so if the ductwork doesn't crush in say 24 inches of
> water, it won't crush in a few inches of sand under a slab. Is my
thinking
> correct here? Or are there any gottchas? Ductwork is 6 inch diameter 30
> gage.
>
> Thanks
>
> Jonathan
Thanks for the suggestions guys.
Jonathan
>> I am planning to run the dust collector duct work for a future table saw
>> under a concrete slab. Just dig a trench, place (sealed) duct work and
>> fill over with sand? I suspect the sand fill is tantamount to a liquid
>> over the long term so if the ductwork doesn't crush in say 24 inches of
>> water, it won't crush in a few inches of sand under a slab. Is my
> thinking
>> correct here? Or are there any gottchas? Ductwork is 6 inch diameter 30
>> gage.
"Greg O" <[email protected]> wrote in message
> Just be sure you ground the PVC to protect from the possibility of an
> explosion! (running, ducking!) ;-)
> Greg
But if it is buried, isn't it automatically grounded?