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One of the problems in achieving
accurate alignment is determining how thick the shims are. Most of our competitor's shims
are produced from gauge material with a very wide tolerance range. This means you need
a micrometer to determine the actual thickness. If you do not check these inferior quality
shims for thickness accuracy, you could easily double your alignment time. Worse yet,
a misalignment that could cost thousands in prematurely worn parts.
It is also a very good idea to check shims for flatness. Flat and nominally marked shims
have a very severe impact on alignment costs.
Along with a very tight flatness specification the material used to produce ALOMA quality
shims must meet the following thickness tolerances: |
| THICKNESS |
THICKNESS
METRIC |
TOLERANCE |
TOLERANCE
METRIC |
| Inch |
mm |
Inch |
mm |
| 0.001 |
0.025 |
±.00005 |
±.00127 |
| 0.002 |
0.051 |
±.0001 |
±.00254 |
| 0.003 |
0.076 |
±.00015 |
±.00381 |
| 0.004 |
0.102 |
±.0002 |
±.00508 |
| 0.005 |
0.127 |
±.00025 |
±.00635 |
| 0.010 |
0.254 |
±.0005 |
±.0127 |
| 0.015 |
0.381 |
±.00075 |
±.01905 |
| 0.020 |
0.508 |
±.001 |
±.0254 |
| 0.025 |
0.635 |
±.00125 |
±.03175 |
| 0.030 |
0.762 |
±.0015 |
±.0381 |
| 0.050 |
1.270 |
±.002 |
±.0508 |
| 0.060 |
1.520 |
±.002 |
±.0508 |
| 0.075 |
1.910 |
±.002 |
±.0508 |
| 0.100 |
2.540 |
±.004 |
±.1016 |
| 0.125 |
3.180 |
±.004 |
±.1016 |
| 0.250 |
6.350 |
±.005 |
±.127 |
| 0.375 |
9.530 |
±.010 |
±.254 |
| 0.500 |
12.700 |
±.010 |
±.254 |
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| All of Aloma Shims greater than
.050 are marked with the exact thickness to within .0005" . The chart below shows just
how far away from the nominal thickness many shim suppliers can be that purchase gauge
AISI tolerance material. Aloma only buys prime material rolled to our specific tolerances
providing our customers with the highest quality shims in the industry. |
|
ALOMA TOLERANCE STANDARDS |
| Shim
Size |
ALOMA
Tolerance |
AISI Tolerance |
| 0.050 |
0.0950+/-0.002 |
18 GA 0.048
±.00003
(typical 0.046) |
| 0.075 |
0.075+/-0.002 |
14 GA 0.072
±.00003
(typical 0.071) |
| 0.100 |
0.100+/-0.004 |
12 GA 0.105
±.00005
(typical 0.117) |
| 0.125 |
0.125+/-0.004 |
11 GA 0.119
±.00005
(typical 0.117) |
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