HomeRoast Digest


Topic: screening coffee grounds on the cheap. (15 msgs / 435 lines)
1) From: jim gundlach
After several searches I have found a source of economical screening 
material.  On the MIT engineering students resource page I found a link 
for a company called Small Parts Inc. They sell several kinds and many 
sizes of screening materials in small quantities for very reasonable 
prices.  For example I can get a set of seven 3"x6" polypropylene 
screens in sizes 1000, 500, 250, 149, 125, 105, and 74 microns for 
$11.60.   I now need to find out what sizes I need to screen ground 
coffee.  With this kind of price on the screening material I can see 
making small screens out of something like PVC fittings for less than a 
buck per screen.
Jim Gundlach
roasting over pecan wood fires
in La Place, Alabama
homeroast mailing listhttp://lists.sweetmarias.com/mailman/listinfo/homeroast

2) From: jim gundlach
On Sunday, October 27, 2002, at 08:54 PM, R.N.Kyle wrote:
<Snip>
go to:
   http://www.smallparts.comClick the "catalog" at the top center of the home page and then click 
the letter S to get the index that includes  screens.  If you have a 
fast connection, you can download their complete catalog, it is about 
35 megs.
Jim Gundlach
homeroast mailing listhttp://lists.sweetmarias.com/mailman/listinfo/homeroast

3) From: Rick Farris
Jim wrote:
<Snip>
That's great, Jim!  The coffeetec website sells kits of five or seven
screens specifically for screening coffee ($300!)
They mention there the sizes of the screens.  The url is www.coffeetec.com.
Follow the links to "cupping room supplies" and I think it will be obvious
at that point.
-- Rick
homeroast mailing listhttp://lists.sweetmarias.com/mailman/listinfo/homeroast

4) From: jim gundlach
Looks like I can come fairly close to matching the set with screens 
available from Small Parts Inc.
I had to do an analysis of the metric versus inch approach to sizing 
screens.  They use the stainless steel threads per inch measurement 
system and call for #12, #16, #18, #20, #30, #40, and #45.  Small Parts 
matches the #16, #20, #30, and #40 with stainless steel for less than 
$3.00 per 3"x6" sheet.  The #18 is quite close to a 1000 micron which 
is available for less than $2.00 per sheet and the #45 is very close to 
a 350 micron which is available in Nylon for $1.35 for the 3"x6" sheet. 
  The only one I'm unable to match is the #12 which would close to a 
1500 micron screen if I could find it.  I will go ahead and order the 
screens to cover all but #12 and I will look at McMaster-Carr when I am 
in the office with a high speed connection to see if they happen to 
have something to cover that one.  Also, I think these may miss the 
dust particles that are a sign of a bad grinder so  I'm going to go 
ahead and order a couple of finer ones to test for dust.
Jim Gundlach
roasting over pecan wood fires
in La Place, Alabama
On Sunday, October 27, 2002, at 04:18 PM, Rick Farris wrote:
<Snip>
homeroast mailing listhttp://lists.sweetmarias.com/mailman/listinfo/homeroast

5) From: Jim Karavias
Jim,
I wonder if static will be a problem for polypro screens. It will be
difficult to ground them and I can just imagine the fines staying at the top
of the stack of sieves due to static cling.  Grounding was important in the
lab when I was measuring pigments.
Regards,
Jim Karavias

6) From: jim gundlach
On Sunday, October 27, 2002, at 06:51 PM, Jim Karavias wrote:
<Snip>
Good point,  I finally got into McMaster-Carr's page for a while.  They 
have metal for everything but the #45 and they do have the #12.  They 
also have a nice sample of nine  6"x6" sheets that cover all but a 
couple of the sizes for less than $20.00.  I lost the page and I can't 
get them to load again.
Jim Gundlach
homeroast mailing listhttp://lists.sweetmarias.com/mailman/listinfo/homeroast

7) From: R.N.Kyle
Jim, could you share that source with the rest of the list? It sound =
like a very reasonable price. thanks for the effort.
Ron Kyle
Anderson SC
rnkyle

8) From: R.N.Kyle
Thanks Jim
Ron Kyle
Anderson SC
rnkyle

9) From: jim gundlach
I just placed an order to McMaster-Carr for sifting screens that almost  
perfectly match Coffeetec $300 set of seven grind analysis screens plus  
it will have five additional screens that should give a more precise  
analysis in the espresso range and allow for the measurement of dust.   
I still have to decide on what kind of stacking containers I will mount  
the screens in.  I would like something in the 3"  range round or  
square but I might be willing to go smaller.    There should be enough  
screen material to make four sets of 3" screens or possibly nine sets  
of 2" screens in this order:
   Qty   |    Part Number/Description        |   Price       | Shipping  
Info
+-------+-----------------------------------+--------------- 
+--------------+
     1 EA    92405T15 - Type 304 SS Wire       $14.53 EA                
today
             Cloth Assortment 6" X 6", Medium
             Mesh, 9 Piece Assortment
     1 EA    85385T837 - Type 304 Stainless    $7.58 EA                 
today
             Steel Woven Wire Cloth 12 X 12
             Mesh, .023" Wire Diameter, 12" X
             12" Sheet
     1 EA    85385T845 - Type 304 Stainless    $5.50 EA                 
today
             Steel Woven Wire Cloth 16 X 16
             Mesh, .018" Wire Diameter, 12" X
             12" Sheet
     1 EA    85385T709 - Type 304 Stainless    $4.10 EA                 
today
             Steel Woven Wire Cloth 42 X 42
             Mesh, .0055" Wire Dia, 12" X 12"
             Sheet
Jim Gundlach
La Place, Alabama
homeroast mailing listhttp://lists.sweetmarias.com/mailman/listinfo/homeroast

10) From: Mark A. Chalkley
Great info, Jim.  I'm anxious to hear how it turns out when you get
them.
Mark C.
On Friday, November 1, 2002, 3:14:44 PM, jim gundlach wrote:
jg> I just placed an order to McMaster-Carr for sifting screens that almost  
jg> perfectly match Coffeetec $300 set of seven grind analysis screens plus  
jg> it will have five additional screens that should give a more precise  
jg> analysis in the espresso range and allow for the measurement of dust.   
jg> I still have to decide on what kind of stacking containers I will mount  
jg> the screens in.  I would like something in the 3"  range round or  
jg> square but I might be willing to go smaller.    There should be enough  
jg> screen material to make four sets of 3" screens or possibly nine sets  
jg> of 2" screens in this order:
jg>    Qty   |    Part Number/Description        |   Price       | Shipping  
jg> Info
jg> +-------+-----------------------------------+--------------- 
jg> +--------------+
jg>      1 EA    92405T15 - Type 304 SS Wire       $14.53 EA                
jg> today
jg>              Cloth Assortment 6" X 6", Medium
jg>              Mesh, 9 Piece Assortment
jg>      1 EA    85385T837 - Type 304 Stainless    $7.58 EA                 
jg> today
jg>              Steel Woven Wire Cloth 12 X 12
jg>              Mesh, .023" Wire Diameter, 12" X
jg>              12" Sheet
jg>      1 EA    85385T845 - Type 304 Stainless    $5.50 EA                 
jg> today
jg>              Steel Woven Wire Cloth 16 X 16
jg>              Mesh, .018" Wire Diameter, 12" X
jg>              12" Sheet
jg>      1 EA    85385T709 - Type 304 Stainless    $4.10 EA                 
jg> today
jg>              Steel Woven Wire Cloth 42 X 42
jg>              Mesh, .0055" Wire Dia, 12" X 12"
jg>              Sheet
jg> Jim Gundlach
jg> La Place, Alabama
jg>
jg> homeroast mailing list
jg>http://lists.sweetmarias.com/mailman/listinfo/homeroast">http://lists.sweetmarias.com/mailman/listinfo/homeroasthomeroast mailing listhttp://lists.sweetmarias.com/mailman/listinfo/homeroast

11) From: Jim Karavias
Hi Jim,
I was just thinking about this and you might be able to use PVC pipe
parts to put together a stack of screens.  I built a clay extruder from
off the shelf PVC pipe and recall some size adapters that seemed to
stack nicely.  
Regards,
Jim Karavias

12) From: Bart Frazee
Jim:
If you make more than one set will you sell the extras? If you do
please put me on the list to buy one.
Bart
On Fri, 1 Nov 2002 14:14:44 -0600, you wrote:
<Snip>
 
<Snip>
 
<Snip>
 
<Snip>
 
<Snip>
homeroast mailing listhttp://lists.sweetmarias.com/mailman/listinfo/homeroast

13) From: James Gundlach
On Friday, November 1, 2002, at 04:08 PM, Bart Frazee wrote:
<Snip>
Once I get a set put together and have procedures worked out so that it 
works,  I will sell assembly instructions and leftover sets of screen 
for about $12.50 if I go with 3" and probably about $7.50 if I go with 
smaller ones.  If you want, I'll put you down as asking first it it 
works out.
Jim Gundlach
homeroast mailing listhttp://lists.sweetmarias.com/mailman/listinfo/homeroast

14) From: Bart Frazee
On Fri, 1 Nov 2002 16:52:25 -0600, you wrote:
<Snip>
Please do.
Bart
<Snip>
homeroast mailing listhttp://lists.sweetmarias.com/mailman/listinfo/homeroast

15) From: jim gundlach
Jim,
     I'm expecting the screens today.  I'm currently looking at 
something even cheaper.  Cans of Tuna are designed to stack and 
yesterday I used the nibbler to cut the bottom out of one.  It left a 
lip around the bottom that is about 1/8 of an inch which would be 
adequate to glue a properly cut screen to.  I will try some of the PVC 
adapter fittings also.  My guess is they would be more stable but 
possibly more difficult the take apart.  I had to order three 12"x12" 
sheets in addition to the nine 6"x6" sheets in the sample set to cover 
the full range of screen size so I will have extra material from the 
three larger sheets to try different designs before I put a full set 
together.  The smaller stacking of cat food cans are a possibility if I 
want to go with smaller screens.   Thanks for thinking about the screen 
project.
Jim Gundlach
On Friday, November 1, 2002, at 02:22 PM, Jim Karavias wrote:
<Snip>
homeroast mailing listhttp://lists.sweetmarias.com/mailman/listinfo/homeroast


HomeRoast Digest