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These spring-tempered, satin chrome finished shrink rules are for laying out wood and metal patterns and core boxes for casting metals. Graduated to give shrink allowances directly, they come in 12" and 24" lengths with shrinks from 1/16-3/8" per foot.
The average shrinkage figures are for metals cast with uniform sections under normal conditions (see table). When using, be sure that the size and shape of castings are considered, since thick castings have less shrink and thin castings more shrink than the figures shown.
Average Shrinkage of Castings (Inches per Foot)
Cast Iron..................1/8"
Malleable Iron...........1/8"
Steel.......................1/4"
Brass..................... 3/16"
Copper................... 3/16"
Aluminum............... 3/16"
Lead...................... 5/16"
Zinc....................... 5/16"
Britannia................. 1/32"
Tin Alloys............... 1/12"
NOTE: Also see No. 62 Rule Holder. A very useful tool for patternmakers.
Steel Rules with Shrink Graduations
Range: 12", 24"
| Catalog No. |
EDP No. |
Description |
List
|
| C100A-12 |
50452 |
12", 1/16" Shrink per Foot, 6R Grad |
59.00
|
| C100A-24 |
50453 |
24", 1/16" Shrink per Foot, 6R Grad |
130.00
|
| C100F-12 |
50458 |
12", 3/16" Shrink per Foot, 6R Grad |
59.00
|
| C100F-24 |
50459 |
24", 3/16" Shrink per Foot, 6R Grad |
130.00
|
| Catalog No. |
EDP No. |
Description |
List
|
| C368-12 |
51424 |
12", 5/16" Shrink per foot, 4R Grad |
60.00
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| C368-24 |
51425 |
24", 5/16" Shrink per foot, 4R Grad |
134.00
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| C369-12 |
51426 |
12", 3/8" Shrink per foot, 4R Grad |
60.00
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| C369-24 |
51427 |
24", 3/8" Shrink per foot, 4R Grad |
134.00
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| C370-12 |
51428 |
12", 1/8" Shrink per foot, 4R Grad |
60.00
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| C370-24 |
51429 |
24", 1/8" Shrink per foot, 4R Grad |
134.00
|
| C374-12 |
51430 |
12", 1/10" Shrink per foot, 4R Grad |
60.00
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| C374-24 |
51431 |
24", 1/10" Shrink per foot, 4R Grad |
134.00
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| C375-12 |
51432 |
12", 3/16" Shrink per foot, 4R Grad |
60.00
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| C375-24 |
51433 |
24", 3/16" Shrink per foot, 4R Grad |
134.00
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| C376-12 |
51434 |
12", 7/32" Shrink per foot, 4R Grad |
60.00
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J.W. Donchin Co.
 Ph: 773-261-2182 • Fax: 773-261-2867 • Email: sales@jwdonchin.com
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