How To Measure The Placement Accuracy of Chip mounter?

When purchasing a chip mounter, buyers typically focus on how much capacity the equipment has? What is the accuracy?

The amount of the capacity determines whether the buyer buys a medium-speed machine, a high-speed machine or a high-end modular mounter.

Accuracy reflects the more comprehensive functions of the mounter, and also the buyer’s more professional response to the requirements. what is the accuracy of XY-axis movement, and what is the accuracy of Z-axis movement? What is the resolution? Do you really understand and know what mounter precision means?

There are two definitions of chip mounter accuracy:

Placement accuracy and repeatability.

Another name for placement accuracy is absolute accuracy. Originally, placement accuracy refers to the mechanical accuracy of the mounter’s X- and Y-axis navigational movements and the Z-axis rotational accuracy. It can be characterized by positioning accuracy (absolute accuracy), repeatability and resolution.

1. Positioning accuracy

Positioning accuracy refers to the deviation between the actual position of the components to be mounted and the position of the components set in the mounting file. For example, the mounter mounting component device coordinates for (0, 0), then the positioning accuracy is the actual mounting value and the deviation value of the coordinates of the point.

2. Repeat accuracy

Common sense, such as the mounter mounting components device coordinates for (0, 0), to repeat this point many times, each time between the deviation value is the repeat accuracy. Accurately, each motion system X navigation, l, navigation and p have their own repeatability, the result of their combined embodiment of the mounter’s placement accuracy, so the mounter sample accuracy is usually characterized by the repeatability of the mounter.

3. Resolution

At present in the SMT industry, the discussion of the resolution of the mounter generally refers to the R-axis rotation resolution. When the patch head receives a pulse of command signal, the patch head R axis will only rotate the number of degrees. To put it more plainly, the degree of R-axis every turn is called R-axis rotation resolution.

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