Sunday, July 28, 2013

HOTSMART MANUFACTURING: RECOMMENDED IRON SIZE FOR HEATER

HOTSMART MANUFACTURING PROCESS
(How to make the core disk or heater)



Will you please RT?




US Sieve
Size
Tyler Equivalent
     mm  Opening
m
in
-
Mesh
8.00 mm.
0.312 in.
-
3 Mesh
6.73
0.265
No. 3½
3½ Mesh
5.66
0.233
No. 4
4 Mesh
4.76
0.187
No. 5
5 Mesh
4.00
0.157
No. 6
6 Mesh
3.36
0.132
No. 7
7 Mesh
2.83
0.111
No. 8
8 Mesh
2.38
0.0937
No.10
9 Mesh
2.00
0.0787
No. 12
10 Mesh
1.68
0.0661
No. 14
12 Mesh
1.41
0.0555
No. 16
14 Mesh
1.19
0.0469
No. 18
16 Mesh
1.00
0.0394
No. 20
20 Mesh
0.841
0.0331
No. 25
24 Mesh
0.707
0.0278
No. 30
28 Mesh
0.595
0.0234
No. 35
32 Mesh
0.500
0.0197
No. 40
35 Mesh
0.420
0.0165
No. 45
42 Mesh
0.354
0.0139
No. 50
48 Mesh
0.297 (0.3 mm) *
0.0117
No. 60
60 Mesh
0.250
0.0098
No. 70
65 Mesh
0.210
0.0083
No. 80
80 Mesh
0.177
0.0070
No.100
100 Mesh
0.149
0.0059
No. 120
115 Mesh
0.125
0.0049
No. 140
150 Mesh
0.105
0.0041
No. 170
170 Mesh
0.088
0.0035
No. 200
200 Mesh
0.074
0.0029
No. 230
250 Mesh
0.063
0.0025
No. 270
270 Mesh
0.053
0.0021
No. 325
325 Mesh
0.044
0.0017
No. 400
400 Mesh
0.037
0.0015
The mesh number system is a measure of how many openings there are per linear inch in a screen. Sizes vary by a factor of √2. This can easily be determined as screens are made from wires of standard diameters, however, opening sizes can vary slightly due to wear and distortion.
US sieve sizes differ from Tyler Screen sizes in that that are arbitrary numbers.

IMPORTANT NOTE:
If you prepare the clay mix for the heater and store it for a long time (one or two days), the iron particules will continue oxidizing   and the size will be reduced (You don't want to do that for reasons out of the scope of this manufacturing instructions).
You can also use a sintering process (using powders) as long as the iron is uniformly distributed in the heater