Phone: 651-778-3300 Fax: 651-778-1321 867 Forest Street, St. Paul, MN 55106
Foundry
Tolerance Guide

Tolerance Guide

Tolerance Guide

A. Dimensions one side of parting
  0"  - 3"   ±0.030"
  3"  - 6"   ±0.040"
  6"  - 9"   ±0.050"
  9"  - 12" ±0.060"
  12" Plus  ±0.060" ±0.002 in/in
B. Dimensions across parting
  1 to 10  sq. in. add ±0.015"
  10 to 100 sq. in. add ±0.030"
  100 to 250 sq. in. add ±0.045"
  250 to 500 sq. in. add ±0.065"
C. Core dimensions
Shell cores
  0" - 6"   ±0.018
  6" - 12"  ±0.025
  12" Plus   ±0.040" ±0.001 in/in
  Add 0.015 across parting
  CO2, Oil Sand
  Same as A and B Dimensions
D. Draft angles
  D1   Outside              1º - 3º
  D2   Internal pockets
         Drag           1º - 5º
         Cope           3º - 7º
  D3   Core box oil sand    2º - 5º
         Core box shell       1/2º - 3º
E. Dimensions between 2 cores
  0" - 6"   ±0.045"
  6" - 12"  ±0.06"
  12" - Plus ±0.06" ±0.002 in/in
F. Dimensions between core and mold
  Same as E
G. Parting line fins
  ±0.015 Grind finish required
  ±0.030 Commercial quality
H. Gate and Riser connection
  ±0.015 Special grinding required
  ±0.06" - 0.03" Commercial quality
I. Wall thickness
  Up to 3/8" +0.060" - 0.030"
  3/8 Plus ±10% of wall thickness
J. Mismatch or Mold and/or core shift
  0" - 8"  ±0.030"
  8" - 18" ±0.060"
  18" Plus  ±0.090"
K. Core fins
  ±0.015" - Special quality"
  ±0.030" - Commercial quality