Tony Ferguson on thu 9 jan 03
Has anyone added a de-airing device to a Walker pugmill? I'm thinking it
shouldn't be too difficult if I buy a unit from venco that attaches via a
top plate with a hose going to the vacuum? I would need to cut a rectangle
and weld a box to receive the lid.
Thank you.
Tony Ferguson
On Lake Superior, where the sky meets the Lake
Stoneware, Porcelain, Raku
www.aquariusartgallery.com
218-727-6339
315 N. Lake Ave
Apt 312
Duluth, MN 55806
----- Original Message -----
From: "Roger Korn"
To:
Sent: Thursday, January 09, 2003 8:53 AM
Subject: Re: Circuit Breakers
> This will work ok, but the breaker won't trip unless a fault in the kiln
> causes more than 50 amps to be drawn. Why not replace it with a 35 Amp
> breaker for better protection? Less than $10.
>
> Roger
>
> Dick Crichlow wrote:
>
> >If a kiln's specs call for a 35 amp breaker is it ok to plug into an
existing line with a 50 amp breaker?
> >
>
>___________________________________________________________________________
___
> >Send postings to clayart@lsv.ceramics.org
> >
> >You may look at the archives for the list or change your subscription
> >settings from http://www.ceramics.org/clayart/
> >
> >Moderator of the list is Mel Jacobson who may be reached at
melpots@pclink.com.
> >
>
> --
> Roger Korn
> McKay Creek Ceramics
> In AZ: PO Box 463
> 4215 Culpepper Ranch Rd
> Rimrock, AZ 86335
> 928-567-5699 <-
> In OR: PO Box 436
> 31330 NW Pacific Ave.
> North Plains, OR 97133
> 503-647-5464
>
>
____________________________________________________________________________
__
> Send postings to clayart@lsv.ceramics.org
>
> You may look at the archives for the list or change your subscription
> settings from http://www.ceramics.org/clayart/
>
> Moderator of the list is Mel Jacobson who may be reached at
melpots@pclink.com.
>
Hank Murrow on thu 9 jan 03
On Thursday, January 9, 2003, at 01:27 PM, Tony Ferguson wrote:
> Has anyone added a de-airing device to a Walker pugmill? I'm thinking
> it
> shouldn't be too difficult if I buy a unit from venco that attaches
> via a
> top plate with a hose going to the vacuum? I would need to cut a
> rectangle
> and weld a box to receive the lid.
>
Dear Tony;
In my experience, a de-airing pugmill needs a screen before the
de-airing chamber to cut the clay into strips about the cross-section
of french fries in order to release and cut the air bubbles in the
clay. Then the vaccumm can do its work. If such a screen can be fitted
to your Walker, your idea might well work.
Cheers, Hank in Eugene
Earl Brunner on thu 9 jan 03
I don't think my housing is airtight enough to do the trick, unless you
added it on the end of the area where the clay is discharged from the
mill.
Earl Brunner
mailto:bruec@anv.net
http://coyote.accessnv.com/bruec
-----Original Message-----
From: Clayart [mailto:CLAYART@LSV.CERAMICS.ORG] On Behalf Of Tony
Ferguson
Sent: Thursday, January 09, 2003 1:27 PM
To: CLAYART@LSV.CERAMICS.ORG
Subject: adding de-airing to Walker pug mill
Has anyone added a de-airing device to a Walker pugmill? I'm thinking
it
shouldn't be too difficult if I buy a unit from venco that attaches via
a
top plate with a hose going to the vacuum? I would need to cut a
rectangle
and weld a box to receive the lid.
Thank you.
Tony Ferguson
On Lake Superior, where the sky meets the Lake
Stoneware, Porcelain, Raku
www.aquariusartgallery.com
218-727-6339
315 N. Lake Ave
Apt 312
Duluth, MN 55806
----- Original Message -----
From: "Roger Korn"
To:
Sent: Thursday, January 09, 2003 8:53 AM
Subject: Re: Circuit Breakers
> This will work ok, but the breaker won't trip unless a fault in the
kiln
> causes more than 50 amps to be drawn. Why not replace it with a 35 Amp
> breaker for better protection? Less than $10.
>
> Roger
>
> Dick Crichlow wrote:
>
> >If a kiln's specs call for a 35 amp breaker is it ok to plug into an
existing line with a 50 amp breaker?
> >
>
>_______________________________________________________________________
____
___
> >Send postings to clayart@lsv.ceramics.org
> >
> >You may look at the archives for the list or change your subscription
> >settings from http://www.ceramics.org/clayart/
> >
> >Moderator of the list is Mel Jacobson who may be reached at
melpots@pclink.com.
> >
>
> --
> Roger Korn
> McKay Creek Ceramics
> In AZ: PO Box 463
> 4215 Culpepper Ranch Rd
> Rimrock, AZ 86335
> 928-567-5699 <-
> In OR: PO Box 436
> 31330 NW Pacific Ave.
> North Plains, OR 97133
> 503-647-5464
>
>
________________________________________________________________________
____
__
> Send postings to clayart@lsv.ceramics.org
>
> You may look at the archives for the list or change your subscription
> settings from http://www.ceramics.org/clayart/
>
> Moderator of the list is Mel Jacobson who may be reached at
melpots@pclink.com.
>
________________________________________________________________________
______
Send postings to clayart@lsv.ceramics.org
You may look at the archives for the list or change your subscription
settings from http://www.ceramics.org/clayart/
Moderator of the list is Mel Jacobson who may be reached at
melpots@pclink.com.
Vince Pitelka on thu 9 jan 03
> Has anyone added a de-airing device to a Walker pugmill? I'm thinking it
> shouldn't be too difficult if I buy a unit from venco that attaches via a
> top plate with a hose going to the vacuum? I would need to cut a
rectangle
> and weld a box to receive the lid.
Tony -
I think someone else asked this same question recently. The problem is that
the placement and design of the blades and helixes on the shaft are very
different in a deairing mill, and a Walker isn't set up that way. A
de-airing mill requires shredder screens or plates right before the vacuum
chamber, with an easy means of removing them for cleaning. And the covers
which allow access to the screens must seal tightly to prevent loss of
vacuum. Immediately before the shredder screens there is a pair of
half-helixes to provide positive pressure to force the clay through the
screens or plates. Also, as per Harry Davis's original design for the
single-shaft deairing mill, the blades after the shredder screens are welded
to the shaft at a slightly steeper angle than the ones before the shredder
screens, so that the clay is moved away from the screens slightly faster
than it is fed into the screens. That keeps the shredded clay loose and
open in the vacuum zone, allowing effective deairing.
Another thing - I think the right-angle extrusion on the Walker would cause
too much back pressure in the second half of the mill, preventing the loose,
open shredding required for deairing. Since the Walker is designed with a
single support bearing at either end of the mill, I am not sure how you
could adapt it for an end extrusion. Perhaps you could design an offset end
extrusion which would provide far less restriction than the side extrusion,
and yet would still allow the end-mounted bearing. As you no doubt know,
the Vencos and Bluebirds (which were all adapted from Harry Davis's design)
have both support bearings at the hopper end of the mill, and the extrusion
end of the shaft is unsupported. During pugging, the shaft naturally keeps
itself centered in the barrel.
Hey, I'm not saying it isn't possible to adapt a Walker to be a deairing
mill, but it will require complete disassembly of the machine and major
remodeling. But here's another way to look at it. I have a 5 HP
4"-extrusion mild steel deairing mill that I built from Harry Davis's plans,
and it was a hell of a lot of work, and I cannot use it for porcelain or
whiteware because it is not stainless steel. Converting a Walker to
deairing would certainly be a lot easier than what I did, and if you have
access to a heliarc unit you can do all the remodeling in stainless steel
and end up with a hell of a mill.
Good luck -
- Vince
Vince Pitelka
Appalachian Center for Crafts
Tennessee Technological University
1560 Craft Center Drive, Smithville TN 37166
Home - vpitelka@dtccom.net
615/597-5376
Work - wpitelka@tntech.edu
615/597-6801 ext. 111, fax 615/597-6803
http://iweb.tntech.edu/wpitelka/
Scott Harrison on fri 10 jan 03
Vince,
I have our Bluebird all apart for new bearings. Can I leave the shredder
screens off if there is no vacuum deairing setup? The clay has been coming
out like a sponge and needs lots of wedging to make it denser.
Scott Harrison
South Fork High School
Miranda CA
> From: Vince Pitelka
> Reply-To: Clayart
> Date: Thu, 9 Jan 2003 20:04:10 -0600
> To: CLAYART@LSV.CERAMICS.ORG
> Subject: Re: adding de-airing to Walker pug mill
>
>> Has anyone added a de-airing device to a Walker pugmill? I'm thinking it
>> shouldn't be too difficult if I buy a unit from venco that attaches via a
>> top plate with a hose going to the vacuum? I would need to cut a
> rectangle
>> and weld a box to receive the lid.
>
> Tony -
> I think someone else asked this same question recently. The problem is that
> the placement and design of the blades and helixes on the shaft are very
> different in a deairing mill, and a Walker isn't set up that way. A
> de-airing mill requires shredder screens or plates right before the vacuum
> chamber, with an easy means of removing them for cleaning. And the covers
> which allow access to the screens must seal tightly to prevent loss of
> vacuum. Immediately before the shredder screens there is a pair of
> half-helixes to provide positive pressure to force the clay through the
> screens or plates. Also, as per Harry Davis's original design for the
> single-shaft deairing mill, the blades after the shredder screens are welded
> to the shaft at a slightly steeper angle than the ones before the shredder
> screens, so that the clay is moved away from the screens slightly faster
> than it is fed into the screens. That keeps the shredded clay loose and
> open in the vacuum zone, allowing effective deairing.
>
> Another thing - I think the right-angle extrusion on the Walker would cause
> too much back pressure in the second half of the mill, preventing the loose,
> open shredding required for deairing. Since the Walker is designed with a
> single support bearing at either end of the mill, I am not sure how you
> could adapt it for an end extrusion. Perhaps you could design an offset end
> extrusion which would provide far less restriction than the side extrusion,
> and yet would still allow the end-mounted bearing. As you no doubt know,
> the Vencos and Bluebirds (which were all adapted from Harry Davis's design)
> have both support bearings at the hopper end of the mill, and the extrusion
> end of the shaft is unsupported. During pugging, the shaft naturally keeps
> itself centered in the barrel.
>
> Hey, I'm not saying it isn't possible to adapt a Walker to be a deairing
> mill, but it will require complete disassembly of the machine and major
> remodeling. But here's another way to look at it. I have a 5 HP
> 4"-extrusion mild steel deairing mill that I built from Harry Davis's plans,
> and it was a hell of a lot of work, and I cannot use it for porcelain or
> whiteware because it is not stainless steel. Converting a Walker to
> deairing would certainly be a lot easier than what I did, and if you have
> access to a heliarc unit you can do all the remodeling in stainless steel
> and end up with a hell of a mill.
> Good luck -
> - Vince
>
> Vince Pitelka
> Appalachian Center for Crafts
> Tennessee Technological University
> 1560 Craft Center Drive, Smithville TN 37166
> Home - vpitelka@dtccom.net
> 615/597-5376
> Work - wpitelka@tntech.edu
> 615/597-6801 ext. 111, fax 615/597-6803
> http://iweb.tntech.edu/wpitelka/
>
> ______________________________________________________________________________
> Send postings to clayart@lsv.ceramics.org
>
> You may look at the archives for the list or change your subscription
> settings from http://www.ceramics.org/clayart/
>
> Moderator of the list is Mel Jacobson who may be reached at
> melpots@pclink.com.
>
Vince Pitelka on fri 10 jan 03
> I have our Bluebird all apart for new bearings. Can I leave the shredder
> screens off if there is no vacuum deairing setup? The clay has been coming
> out like a sponge and needs lots of wedging to make it denser.
Scott -
I am assuming that this is a Bluebird deairing mill, but that you do not
have the vacuum pump operating. If so, then by all means remove the
shredding screens or plates and use it as a non-deairing mill.
Best wishes -
- Vince
Vince Pitelka
Appalachian Center for Crafts
Tennessee Technological University
1560 Craft Center Drive, Smithville TN 37166
Home - vpitelka@dtccom.net
615/597-5376
Work - wpitelka@tntech.edu
615/597-6801 ext. 111, fax 615/597-6803
http://iweb.tntech.edu/wpitelka/
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