Reference
| | | | Model Scales | | | Scale models are intended to be true representations of the real model. To achieve this dimensions on the real machine are reduce to a smaller size, and if all dimensions are reduced in the same ration, the model will be proportioned correctly.
The proportion by which a model is reduced is called the scale. As an example, this means that a model which is 1:50 scale has dimensions which are one fiftieth of full size. So a dimension of 50cm on the real machine will be 1cm on the model. This means that a scale of 1:87 is a smaller model than 1:50 because its dimensions have been reduced by more.
Some of the scales usually found are as follows:
 1:16 - A very large scale rarely used for construction models. An example is the Caterpillar Twenty.
 1:24 - A rarely used scale. Classic Construction Models (CCM) produced the Caterpillar D7E in this scale.
1:25 - A large scale used for construction models of smaller earthmoving machines. | | | | | | | | | | | | | | | | | | |
| | Model Scales (continued) | | |  1:32 - A large scale which is often used for powered access equipment and smaller earthmoving models. An example is the Kramer Allrad 3307.
1:35 - A large scale also used for access and earthmoving models.
 1:48 - This is 'O' gauge for railway layouts in some countries. Few models are made in this scale, but one is the Bucyrus Steam Shovel. Classic Construction Models usually produce models in this scale.
1:50 - The standard scale for construction, mining and haulage models and the scale of the majority of models on Cranes Etc.
 1:76 - This is 'OO' railway scale as used by Hornby railways. Few construction models are made in this scale but one example is the 19RB.
 1:87 - A small scale used for a variety of models which are relatively affordable. It is 'HO' scale so fits with railways in that scale. This scale allows very large tower cranes to be made in a practical size. An example is the Wolff 355B.
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