Michael Wendt on sat 14 apr 01
One final note to add:
Be sure you get a totally enclosed motor meant for dusty locations. It
doesn't need to be explosion proof since glazes are noncombustible, but open
frame motors die an early death in this application. Vince mentioned the
alternate style which I have... the motor is not in the air stream and has
an enclosed drive tube for the belt so the motor never is exposed to dirt
and I can use the cheaper open frame motors. Mine has lasted nearly 20 years
now with only 1 belt replacement.
Regards,
Michael Wendt, wendtpot@lewiston.com
2729 Clearwater Avenue
Lewiston, Idaho 83501
call 1-800-554-3724
Fraley on sat 14 apr 01
For all of you out there who spray on your glazes which would you
recommend between a normal fan blower and a squirrel cage? The ones I am
looking at are on the Sugar Creek Industries page
(www.sugarcreekind.com). The squirrel cage delievers about 980 cfm
(about 180 cfm more than the straight fan assembly). I have heard that
the grittyness of glazes will chew up the moter in the fan assembly
option but the squirrel cage job is a few hundred dollars more, is it
worth it? Thanks in advance for any help. PS I have to make up my mind
by Monday to get it on the next truck.
Toby Atticus Fraley
Jonathan Kaplan on sat 14 apr 01
on 4/14/01 1:56 PM, Fraley at artshop@PULSENET.COM wrote:
> For all of you out there who spray on your glazes which would you
> recommend between a normal fan blower and a squirrel cage? The ones I am
> looking at are on the Sugar Creek Industries page
> (www.sugarcreekind.com). The squirrel cage delievers about 980 cfm
> (about 180 cfm more than the straight fan assembly). I have heard that
> the grittyness of glazes will chew up the moter in the fan assembly
> option but the squirrel cage job is a few hundred dollars more, is it
> worth it? Thanks in advance for any help. PS I have to make up my mind
> by Monday to get it on the next truck.
>
We use a Paasche booth with a 12" inline fan, cast aluminum blades with an
external motor, booth model number EB-3. At free air deliver in moves about
1650 cfm or air. Even at 3/4" static pressure this fan moves 300 cfm, which
is alot of air.
This has been a great booth for us for 10 years or so. Paasche spray booths
are expensive, but they are well worth it.
You can build a booth for far less cost and buy a good inline fan with an
external motor from Graingers. Most potters have a dry booth, which just
takes out the overspay through a furnace filter. There are wet booths that
you spray into a waterfall of water moved by a pump. There is still air
moving via a fan, but the waterfall catches the overspray. The heavier
particles of glaze settle out and are cleaned periodically. My colleague
Bill Campbell in Pennsylvania has built a number of these and they are bvery
effective
I'd be wary of small squirrel cage units that have the fan internally
mounted as you will loose the motor pretty quickly. These units seem to be
fairly light duty.
Good luck
Jonathan
Dave Finkelnburg on sat 14 apr 01
Toby,
I can't tell you which booth to buy. I have no experience with squirrel
cage versus axial flow fans in a spray booth application.
The nominal air flow velocity on the 700 cfm unit on the site you
mentioned is low. The Industrial Ventilation Manual suggests that the face
velocity (air velocity across the front opening) of the spray booth should
be 100 to 200 feet per minute.
I looked at the spray booths on the site you mentioned and see that the
first one, 30 x 40-inch opening, 980 cfm fan, has a calculated face velocity
of about 118 fpm. The same unit with the 700-cfm fan has a velocity of 84
fpm. The vertical unit, 27.75 x 20-inches, 980 cfm, has a face velocity of
254 fpm. Remember these velocities are theoretical. Once you have some
ducting in place, or the filters are a bit dirty, air flow will drop and the
velocities will be lower.
The two 980-cfm,squirrel-cage units at this site will be better choices.
Good luck finding a spray booth!
Dave Finkelnburg
Jennifer F Boyer on sun 15 apr 01
I had to make temporary spray booths for a Steven Hill Workshop
several years ago and asked Clayart for info. The fan I ended up
with was a 2000 cfm closed motor wall exhauster from
http://www.mscdirect.com
The MSC part number is 76932086 and is around 145.00. The web
site allows you to search by part number. I have 2 in my studio
now, to exhaust dust, etc. One will be a spray booth, but i
haven't built it yet. This fan has an available shutter mount
but I ended up using a homemade closure for keeping heat in when
it's not in use.
I remember being steered away from squirrel cages by Clayart
people, but now i don't remember why. The conversation would
have been in the fall of1998.
Take Care
Jennifer
Michael Wendt wrote:
>
> One final note to add:
> Be sure you get a totally enclosed motor meant for dusty locations. It
> doesn't need to be explosion proof since glazes are noncombustible, but open
> frame motors die an early death in this application. Vince mentioned the
> alternate style which I have... the motor is not in the air stream and has
> an enclosed drive tube for the belt so the motor never is exposed to dirt
> and I can use the cheaper open frame motors. Mine has lasted nearly 20 years
> now with only 1 belt replacement.
> Regards,
> Michael Wendt, wendtpot@lewiston.com
> 2729 Clearwater Avenue
> Lewiston, Idaho 83501
> call 1-800-554-3724
>
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--
~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*
Jennifer Boyer mailto:jboyer@adelphia.net
Thistle Hill Pottery
95 Powder Horn Glen Rd
Montpelier, VT 05602 USA
802-223-8926
http://www.thistlehillpottery.com/
Never pass on an email warning without checking out this site
for web hoaxes and junk:
http://urbanlegends.about.com/science/urbanlegends/cs/nethoaxes/index.htm
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Martin Howard on wed 25 apr 01
A new concept in spray booths is being developed by Potters Mate,
Toppesfield, Essex, England. As a guinea pig friend, I have been offered =
the
first one.
The idea is simply that we should not be venting expensive heated air to =
the
outside, or wasting expensive glaze. The protomodel overcomes both proble=
ms,
recycling air, water and glaze material, safely.
Will let Clayarters know of results, later.
Martin Howard
Webb's Cottage Pottery
Woolpits Road, Great Saling
BRAINTREE, Essex CM7 5DZ
England
martin@webbscottage.co.uk
http://www.webbscottage.co.uk
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