Alloys |
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| A broad range of ferrous and non-ferrous metals
are used. We produce all kinds of stainless steels,
carbon steels, alloy steels and non-ferrous materials
products in ASTM, DIN, AISI, JIS... standards according
to the customer's requirements. |
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Weight |
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| From 2 grams up to 30kg (65 lbs), depending upon
part configuration. |
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Size |
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| Up to 0.63 m x 0.63 m (25" x 25"), max
length 0.95 m (37.5"), min thickness 1.5mm
(0.06"), depending upon part configuration. |
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Linear tolerances |
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The general standard for linear tolerance of
investment castings is ±.005 per inch of length.
Tighter tolerances can be made available for a
few selected design characteristics. However,
please note that tighter tolerances usually require
special procedures and/or secondary operations
which can increase the cost and the production
time.
General parameters for linear investment casting
tolerances are shown below: |
| Inches |
Millimeters |
| Dimension |
Normal |
Premium |
Dimension |
Normal |
Premium |
| up to 1/2" |
±.007 |
±.003 |
up to 12.7 |
±.18 |
±.08 |
| 1/2" to 1" |
±.010 |
±.005 |
12.7 to 25.4 |
±.25 |
±.13 |
| 1" to 2" |
±.015 |
±.010 |
25.4 to 50.8 |
±.38 |
±.25 |
| 2" to 3" |
±.020 |
±.015 |
50.8 to 76.2 |
±.51 |
±.38 |
| 3" to 4" |
±.025 |
±.018 |
76.2 to 101.6 |
±.64 |
±.46 |
| 4" to 5" |
±.030 |
±.020 |
101.6 to 127.0
|
±.76 |
±.51 |
| 5" to 6" |
±.032 |
±.022 |
127.0 to 152.4 |
±.81 |
±.56 |
| 6" to 7" |
±.035 |
±.025 |
152.4 to 177.8 |
±.89 |
±.64 |
| 7" to 8" |
±.038 |
±.028 |
177.8 to 203.2 |
±.96 |
±.71 |
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Angularity |
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| Angular tolerance on investment castings should
not be less than ±1/2°. |
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Concentricity |
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| Concentricity tolerance varies according to straightness
at about ±.005" per linear inch of difference
between points of measure. |
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Roundness |
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| Out of round is the radial difference between
a true circle and the cast surface diameter. The
standard tolerance is ±.005 per inch for axial straightness,
roundness (bar or tube shapes) and positioning of
holes or bosses. |
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Flatness |
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| Flatness is measured as the distance between two
parallel planes, within which the entire surface
of the part must lie. Flatness deviation is a function
of shrinkage in the wax and metal in solidification.
It is directly related to the thickness of the cross-section
and although each casting will vary individually,
a rough tolerance guide would be .003" T.I.R.
(Total Indicator Reading), for each 1/4" thick
section. This variation will be apparent in surfaces
of 1" or more linear dimension. |
