Paul on mon 15 sep 03
Anyone know how to make a nozzle for a pug mill? The plans i have show how
to bend a piece of sheet metal using a torch by heating it along concentric
lines and hammering until the cone shape comes into form, but i just don't
see myself getting this right because it seems beyond my skill level. I may
have to choice but to try it until i get it right, but i know someone who
works at a metal shop and said he would run it through a roller if i can cut
it to the right shape. How do you figure out the shape? My barrel is 8" and
would need to reduce to 4". Does anyone out there have experience with this
sort of thing?
thanks,
Paul B
Falmouth,ky
Milla Miller on mon 15 sep 03
Bluebird nozzles are sold sepertely if you are not able to make a good one.I
know this isn't what you want but they are out there if you need one.
Louis Katz on mon 15 sep 03
Make it octagonal.
Louis
On Monday, September 15, 2003, at 01:12 AM, Paul wrote:
> Anyone know how to make a nozzle for a pug mill? The plans i have show
> how
> to bend a piece of sheet metal using a torch by heating it along
> concentric
> lines and hammering until the cone shape comes into form, but i just
> don't
> see myself getting this right because it seems beyond my skill level.
> I may
> have to choice but to try it until i get it right, but i know someone
> who
> works at a metal shop and said he would run it through a roller if i
> can cut
> it to the right shape. How do you figure out the shape? My barrel is
> 8" and
> would need to reduce to 4". Does anyone out there have experience with
> this
> sort of thing?
> thanks,
> Paul B
> Falmouth,ky
>
> _______________________________________________________________________
> _______
> 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.
>
Michael Wendt on mon 15 sep 03
Paul,
The nozzle you want is easily made with a large compass (I use wire and a
marking pen). Figure the slope you want and if it is to be a long nozzle,
project that out on a large drawing surface in cross section view until the
lines form the point of a triangle. Place the point of your compass at the
tip. Set the pen to draw arcs at the wide part of the nozzle and the narrow
part of the nozzle. Calculate the cirumference of the nozzle at the wide and
narrow points and use a tape measure to lay off those lengths on the two
arcs. The result will be a curved piece that forms a truncated cone when
rolled into a tube shape.
Good Luck,
Michael Wendt
wendtpot@lewiston.com
wayneinkeywest on mon 15 sep 03
Paul:
According to my math reference book, if the barrel is 8 inches,
and the output size you want is four inches, then you need to cut
a piece of metal that would, when bent, equal those dimensions
on the ends. Since circumference is 3.1416 (pi) times two times
the radius of the circle, then 3.1416X2X4 (for the 8" circle)
equals 25.13inches. For the four inch end, then,. 3.1416X2X2
equals 12.57inches. So you need to cut a piece of metal that is
25.13 inches on one side, 12.57 inches on the other side,
and about half again as long as you want this nozzle to be...
say 18 inches or so, since you do not want too radical an angle.
You might be able to get away with aluminium, but I do not have
any experience with pugmills (yet) and do not know the pressure
of the clay coming out of the end. You will probably want to find a
way to attach it to the end of the pugmill as well, and might want to
have a welder or machine shop weld or braze a flange on that 8 inch
end for you.
Hope that helps,
Wayne in Key West
> Anyone know how to make a nozzle for a pug mill? The plans i have show how
> to bend a piece of sheet metal using a torch by heating it along
concentric
> lines and hammering until the cone shape comes into form, but i just don't
> see myself getting this right because it seems beyond my skill level. I
may
> have to choice but to try it until i get it right, but i know someone who
> works at a metal shop and said he would run it through a roller if i can
cut
> it to the right shape. How do you figure out the shape? My barrel is 8"
and
> would need to reduce to 4". Does anyone out there have experience with
this
> sort of thing?
> thanks,
> Paul B
> Falmouth,ky
Donn Buchfinck on mon 15 sep 03
use cardboardand paper to make the template/model out of.
pretend the cardboard is the sheet metal, say 10 to 12 guage.
so construct the nozzel with the cardboard and tape,
I would create two of them for the metal worker, one that is all taped up
with the bolt holes in it and all and another one but not assembled, so the metal
worker can use them as patterns to cut out the metal,
take a strip of cardboard and bend it around into a cylinder, if you cut the
ends at an angle making one side of the stip shorter than the other a cone
will be formed.
look around for someone to make it is stainless, won't rust then.
good luck,
Donn Buchfinck
San Francisco
steve harrison on tue 16 sep 03
Hi Paul,
I've made a few pug nozzles in my time.
you can take the easier path and cut 4 trapezeoids (like truncated
triangles)
each one only has to be hammered into a quarter circle, which is not to
difficult. If you use 16 guage, you wont even need heat.
Leave the other end flat so that you extrude a square section.
not too hard at all. Weld it onto a ring to suit the pug dia.
Alternatively, you can buy a reduction unit for steam pipe. This will
be expensive, but all you have to do is order it, pay for it, (ouch)
and weld it onto the ring, as above, even simpler.
I have one of each. I can send you a jpeg.
Best wishes
Steve Harrison
Hot & Sticky Pty Ltd
5 Railway Pde
Balmoral Village
NSW 2571
Australia
http://ian.currie.to/sh/Steve_Harrisons_books.html
On Monday, September 15, 2003, at 04:12 PM, Paul wrote:
> Anyone know how to make a nozzle for a pug mill? The plans i have show
> how
> to bend a piece of sheet metal using a torch by heating it along
> concentric
> lines and hammering until the cone shape comes into form, but i just
> don't
> see myself getting this right because it seems beyond my skill level.
> I may
> have to choice but to try it until i get it right, but i know someone
> who
> works at a metal shop and said he would run it through a roller if i
> can cut
> it to the right shape. How do you figure out the shape? My barrel is
> 8" and
> would need to reduce to 4". Does anyone out there have experience with
> this
> sort of thing?
> thanks,
> Paul B
> Falmouth,ky
>
> _______________________________________________________________________
> _______
> 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.
>
| |
|
