Klyf Brown on thu 15 nov 01
Joyce,
I am sure that you will get lots of scientific answers, ways to set up a
spreadsheat to get the shrinkage, stuff like that. For some, that is the
wway to do it. The most sure way to determine the size stopper you
need is to fire off a couple of samples the way you intend to finish
them (glaze/no glaze around the hole) and find stoppers that fit that
size hole.
Damnit Scotty, I'm a potter, not a mathematition!
Klyf Brown
11/15/01 12:47:30 PM, Joyce Lee
wrote:
..... I think I'm the only person in our potters' world who doesn't
know for sure how to determine what size rubber stoppers I need to
order. Do I just make holes, fire and then measure and then order?
..... doesn't sound very scientific ..
Paul Lewing on thu 15 nov 01
on 11/15/01 11:47 AM, Joyce Lee at joycelee@IWVISP.COM wrote:
> Do =
> I just make holes, fire and then measure and then order? ..... doesn't =
> sound very scientific .
Well, no, but that would work. At least if you use corks it would. They
come in such a range of sizes that you can get one to fit almost any size
hole. You just need to always make the same size hole, either by using the
same size hole cutter all the time or by throwinng the hole around the same
size round object all the time. I used to throw a lot of spice jars that
were corked. I used the same pill bottle all the time and just closed the
opening around it. A number 22 cork always fit that.
But I don't know if rubber stoppers come in that wide a variety of sizes.
You might just have to experiment till you find a cutter or template that's
just enough bigger than whatever size stoppers you want to use.
These aren't the same rubber things that Marcia Selsor buys by the gross,
are they? No, I guess her rubbers stop something else.
Paul Lewing, Seattle
Tommy Humphries on thu 15 nov 01
I usually work backwards... measure the stopper, then calculate the
shrinkage factor and you have your hole size... remember the bottom of the
shakers need to be concave, or the stoppers will make the shaker rock. We
ordered the stoppers in the aftosa catalog, white, hollow rubber ones cheap,
and they are flexible enough that you have some lee-way with the size of the
hole.
Tommy
----- Original Message -----
From: "Joyce Lee"
To:
Sent: Thursday, November 15, 2001 1:47 PM
Subject: Stupid Arithmetic/Brown & Midnight Blue Turning
Maybe you recall the star extrusions I made a couple weeks ago in an attempt
to ascertain how long it would take me to slice some six thousand. I am now
using those hollow extrusions to create salt&pepper shakers, which I've
never even considered to this point. Salt&peppers are a natural for some of
the dies that came with my manual NorthStar. BUT .... having searched the
archives and scanned handbuilding books ..... I think I'm the only person in
our potters' world who doesn't know for sure how to determine what size
rubber stoppers I need to order. Do I just make holes, fire and then
measure and then order? ..... doesn't sound very scientific .. order some of
each size and hope one fits? ...... order larger sizes and cut them down if
necessary?.... there must be some more precise way of doing this which is
eluding me for the moment .....
If any of you know how to do this and are willing to share, I'd very much
appreciate your efforts.
Joyce
In the Mojave where the AlbanySlipTypeGlaze (as I envision it, anyway) has
now been out of the kiln and stone cold for many hours ..... is beginning to
show areas of "shino" and "midnight blue" ...... which were NOT there
yesterday...... gonna go make some more kiln Gods....... eerie..... and I'm
not opening that door anymore until the kiln has completely cooled......
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Joyce Lee on thu 15 nov 01
Maybe you recall the star extrusions I made a couple weeks ago in an =
attempt to ascertain how long it would take me to slice some six =
thousand. I am now using those hollow extrusions to create salt&pepper =
shakers, which I've never even considered to this point. Salt&peppers =
are a natural for some of the dies that came with my manual NorthStar. =
BUT .... having searched the archives and scanned handbuilding books =
..... I think I'm the only person in our potters' world who doesn't know =
for sure how to determine what size rubber stoppers I need to order. Do =
I just make holes, fire and then measure and then order? ..... doesn't =
sound very scientific .. order some of each size and hope one fits? =
...... order larger sizes and cut them down if necessary?.... there must =
be some more precise way of doing this which is eluding me for the =
moment .....
If any of you know how to do this and are willing to share, I'd very =
much appreciate your efforts.
Joyce
In the Mojave where the AlbanySlipTypeGlaze (as I envision it, anyway) =
has now been out of the kiln and stone cold for many hours ..... is =
beginning to show areas of "shino" and "midnight blue" ...... which were =
NOT there yesterday...... gonna go make some more kiln Gods....... =
eerie..... and I'm not opening that door anymore until the kiln has =
completely cooled......=20
Cindy Strnad on fri 16 nov 01
Joyce,
W-e-e-e-l-l-l . . . To tell you the truth, I make
my salt shakers (I don't make many--only when I or
someone else wants one), and then I take them down
to the hardware store and fit them with corks. But
if you were going to go into the business, I'd
suggest choosing a hole cutter, using it to make
all your salt-shaker holes, and then fitting the
corks after firing. After that, you'll know,
forever and ever. I don't know if cork numbers and
rubber stopper numbers are the same, but someone
at Aftosa will know that stuff. I've always found
them very helpful.
Of course, you can measure the hole and figure the
shrinkage of your clay and all. This works. Just
find the diameter of the stopper a little below
the top. Pretend it's 4mm, and your clay shrinkage
is 12.5%. Get out your calculator and key in 4 x
12.5/100. This will get you the 12.5%, which, with
these numbers, is 0.5. So you need to make your
hole 4.5 mm. This really does work, but you need
to make the hole in the wet clay, unless you've
figured out your shrinkage from wet to leatherhard
or bisqued ware. It also requires finding a
holemaker the right size. All in all, the first
method is easier for something of this sort, where
a wide range of stopper sizes is available.
Cindy Strnad
Earthen Vessels Pottery
RR 1, Box 51
Custer, SD 57730
USA
cindy@earthen-vessels-pottery.com
http://www.earthen-vessels-pottery.com
Tommy Humphries on fri 16 nov 01
after finding the correct size hole for the stoppers you choose, make a jig
out of thin metal...wide banding steel will do. trim it to the desired size.
when making the shakers, you will not need to be real precise on making the
holes. when dry use the steel jig to ream out the hole...perfect every
time...
Tommy
Des & Jan Howard on sun 18 nov 01
Joyce
For thrown items we take the cork to be used in the
fired pot, stick a nail in the small end, hold onto the nail
& use the big end of the cork to judge the size of the
neck hole as it is being collared in.
On extrusions that have a top & base added, a loop turning tool,
the size of the large end of the cork, is used to cut a hole.
The loop tool is made from the usual bobby pin
(hair pin to some) bent to shape with pliers &
fastened in a fat wooden dowel.
Des
Joyce Lee wrote:
> Maybe you recall the star extrusions I made a couple weeks ago in an attempt to ascertain how long it would take me to slice some six thousand. I am now using those hollow extrusions to create salt&pepper shakers, which I've never even considered to this point. Salt&peppers are a natural for some of the dies that came with my manual NorthStar. BUT .... having searched the archives and scanned handbuilding books ..... I think I'm the only person in our potters' world who doesn't know for sure how to determine what size rubber stoppers I need to order. Do I just make holes, fire and then measure and then order? ..... doesn't sound very scientific .. order some of each size and hope one fits? ...... order larger sizes and cut them down if necessary?.... there must be some more precise way of doing this which is eluding me for the moment .....
--
Des & Jan Howard
Lue Pottery
LUE NSW 2850
Australia
Ph/Fax 02 6373 6419
http://www.luepottery.hwy.com.au
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